{"id":18363,"date":"2019-07-31T06:20:42","date_gmt":"2019-07-31T06:20:42","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=13588"},"modified":"2020-05-07T01:34:46","modified_gmt":"2020-05-07T01:34:46","slug":"grinding-parameters-on-carbide-products","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/grinding-parameters-on-carbide-products\/","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u00e1c th\u00f4ng s\u1ed1 m\u00e0i \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c s\u1ea3n ph\u1ea9m cacbua vonfram?"},"content":{"rendered":"

Ch\u00e0o m\u1ecdi ng\u01b0\u1eddi, m\u1ed9t v\u1eadt li\u1ec7u m\u1edbi h\u00e0ng tu\u1ea7n tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i c\u00e1c cacbua xi m\u0103ng si\u00eau m\u1ecbn. \u0110\u1ecdc c\u00e1i n\u00e0y c\u00f3 l\u1ebd b\u1ea1n s\u1ebd m\u1ea5t kho\u1ea3ng 15 ph\u00fat<\/p>

T\u00f3m t\u1eaft b\u00e0i vi\u1ebft n\u00e0y: Th\u00ed nghi\u1ec7m m\u00e0i cacbua xi m\u0103ng si\u00eau m\u1ecbn \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean m\u00e1y m\u00e0i ph\u1eb3ng v\u1edbi b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng. H\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t m\u00e0i \u0111\u01b0\u1ee3c quan s\u00e1t b\u1eb1ng k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t v\u00e0 \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng m\u00e1y ki\u1ec3m tra \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t. \u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c th\u00f4ng s\u1ed1 m\u00e0i \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua si\u00eau m\u1ecbn \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch. K\u1ebft qu\u1ea3 cho th\u1ea5y \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn t\u0103ng l\u00ean c\u00f9ng v\u1edbi s\u1ef1 gia t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i \u1edf c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft. Khi m\u00e0i v\u1edbi c\u00f9ng m\u1ed9t b\u00e1nh m\u00e0i c\u1ee1 h\u1ea1t, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua xi m\u0103ng si\u00eau m\u1ecbn t\u0103ng l\u00ean c\u00f9ng v\u1edbi s\u1ef1 gia t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft. Khi \u0111\u1ed9 s\u00e2u c\u1eaft t\u0103ng \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ecbnh, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t gi\u1ea3m d\u1ea7n.<\/p>

Gi\u1edbi thi\u1ec7u<\/h2>

WC-Co xi m\u0103ng cacbua l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u c\u00f4ng c\u1ee5 th\u00f4ng th\u01b0\u1eddng. Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n kh\u00f4ng ng\u1eebng c\u1ee7a c\u00f4ng ngh\u1ec7 c\u1eaft, c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a v\u1eadt li\u1ec7u d\u1ee5ng c\u1ee5 ng\u00e0y c\u00e0ng cao h\u01a1n. So v\u1edbi cacbua xi m\u0103ng c\u1ea5u tr\u00fac truy\u1ec1n th\u1ed1ng, cacbua xi m\u0103ng si\u00eau m\u1ecbn (c\u1ee1 h\u1ea1t WC 0,1-0,6 um) c\u00f3 \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 c\u1ee9ng v\u00e0 ch\u1ed1ng m\u00e0i m\u00f2n cao h\u01a1n, v\u00ec v\u1eady ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong ng\u00e0nh s\u1ea3n xu\u1ea5t d\u1ee5ng c\u1ee5.<\/p>

\"th\u00f4ng<\/figure>

Nghi\u1ec1n b\u1eb1ng b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c c\u00f4ng c\u1ee5 cacbua xi m\u0103ng. Nhi\u1ec1u nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i c\u00f3 \u1ea3nh h\u01b0\u1edfng quan tr\u1ecdng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1eaft v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a c\u00e1c c\u00f4ng c\u1ee5 cacbua xi m\u0103ng. Cho \u0111\u1ebfn nay, nghi\u00ean c\u1ee9u m\u00e0i cacbua xi m\u0103ng trong v\u00e0 ngo\u00e0i n\u01b0\u1edbc ch\u1ee7 y\u1ebfu t\u1eadp trung v\u00e0o c\u1ea3i ti\u1ebfn quy tr\u00ecnh m\u00e0i cacbua xi m\u0103ng truy\u1ec1n th\u1ed1ng v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t, trong khi quy tr\u00ecnh m\u00e0i cacbua si\u00eau m\u1ecbn, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i, hi\u1ebfm khi \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u. Do \u0111\u00f3, th\u00f4ng qua c\u00e1c th\u00ed nghi\u1ec7m m\u00e0i, \u1ea3nh h\u01b0\u1edfng c\u1ee7a k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i v\u00e0 \u0111\u1ed9 s\u00e2u c\u1eaft \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua xi m\u0103ng si\u00eau m\u1ecbn \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t (SEM) v\u00e0 m\u00e1y \u0111o \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t, \u0111\u1ec3 cung c\u1ea5p c\u01a1 s\u1edf cho vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a c\u1ee7a qu\u00e1 tr\u00ecnh nghi\u1ec1n cacbua si\u00eau m\u1ecbn.<\/p>

V\u1eadt li\u1ec7u v\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1eed<\/h2>

V\u1eadt li\u1ec7u th\u1eed<\/h3>

V\u1eadt li\u1ec7u th\u1eed l\u00e0 h\u1ea1t cacbua si\u00eau m\u1ecbn WC-Co \u0111\u01b0\u1ee3c thi\u00eau k\u1ebft b\u1eb1ng c\u00f4ng ngh\u1ec7 HIP. C\u1ee1 m\u1eabu l\u00e0 10 mm x 10 mm x 10 mm. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong B\u1ea3ng 1.<\/p>

B\u1ea3ng 1 Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u th\u1eed<\/p>

\"th\u00f4ng<\/figure>

C\u00e1c m\u1eabu \u0111\u01b0\u1ee3c k\u1eb9p b\u1eb1ng k\u1eb9p ph\u1eb3ng ch\u00ednh x\u00e1c v\u00e0 ti\u1ebfp \u0111\u1ea5t tr\u00ean m\u00e1y m\u00e0i b\u1ec1 m\u1eb7t Model M7120. B\u00e1nh m\u00e0i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0 b\u00e1nh m\u00e0i ph\u1eb3ng kim c\u01b0\u01a1ng ngo\u1ea1i quan c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i 250 mm, chi\u1ec1u r\u1ed9ng 25 mm v\u00e0 \u0111\u1ed9 d\u00e0y l\u1edbp kim c\u01b0\u01a1ng l\u00e0 8 mm. Ch\u1ea5t l\u00e0m m\u00e1t l\u00e0 h\u1ed7n h\u1ee3p n\u01b0\u1edbc v\u00e0 d\u1ea7u nh\u0169 h\u00f3a. C\u00e1c tham s\u1ed1 m\u00e0i th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong B\u1ea3ng 2.<\/p>

\"th\u00f4ng<\/figure>

Sau khi th\u1eed nghi\u1ec7m nghi\u1ec1n, c\u00e1c m\u1eabu \u0111\u01b0\u1ee3c l\u00e0m s\u1ea1ch b\u1eb1ng acetone khan trong ch\u1ea5t t\u1ea9y r\u1eeda si\u00eau \u00e2m trong 30 ph\u00fat v\u00e0 l\u00e0m kh\u00f4 b\u1eb1ng kh\u00f4ng kh\u00ed n\u00f3ng. K\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t v\u1edbi m\u00e1y d\u00f2 ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 quan s\u00e1t h\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a m\u1eabu. \u0110\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a m\u1eabu \u0111\u01b0\u1ee3c \u0111o d\u1ecdc theo h\u01b0\u1edbng vu\u00f4ng g\u00f3c v\u1edbi h\u01b0\u1edbng m\u00e0i v\u1edbi m\u00e1y \u0111o \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t. B\u01b0\u1edbc l\u1ea5y m\u1eabu l\u00e0 0,25 mm v\u00e0 chi\u1ec1u d\u00e0i \u0111\u00e1nh gi\u00e1 l\u00e0 4 l\u1ea7n c\u1ee7a b\u01b0\u1edbc. M\u1ed7i m\u1eabu \u0111\u01b0\u1ee3c \u0111o s\u00e1u l\u1ea7n v\u00e0 k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c t\u00ednh trung b\u00ecnh.<\/p>

k\u1ebft qu\u1ea3 ki\u1ec3m tra<\/strong><\/strong><\/p>

H\u00ecnh. 1 cho th\u1ea5y s\u1ef1 thay \u0111\u1ed5i c\u1ee7a \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i v\u1edbi k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i d\u01b0\u1edbi c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft (ap = 10 um). C\u00f3 th\u1ec3 th\u1ea5y t\u1eeb bi\u1ec3u \u0111\u1ed3 r\u1eb1ng \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i t\u0103ng khi t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i \u1edf c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft. Nh\u01b0ng \u1ea3nh h\u01b0\u1edfng c\u1ee7a k\u00edch th\u01b0\u1edbc h\u1ea1t m\u00e0i b\u00e1nh xe \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t l\u00e0 kh\u00e1c nhau. So v\u1edbi b\u00e1nh m\u00e0i 150 #, s\u1eed d\u1ee5ng b\u00e1nh m\u00e0i 280 #, s\u1ef1 thay \u0111\u1ed5i \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t nh\u1ecf h\u01a1n trong khi s\u1eed d\u1ee5ng b\u00e1nh m\u00e0i W20, s\u1ef1 thay \u0111\u1ed5i \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t l\u1edbn h\u01a1n. H\u00ecnh 2 cho th\u1ea5y s\u1ef1 thay \u0111\u1ed5i c\u1ee7a \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t v\u1edbi \u0111\u1ed9 s\u00e2u c\u1eaft AP khi m\u00e0i v\u1edbi c\u00f9ng m\u1ed9t b\u00e1nh m\u00e0i (150 #). C\u00f3 th\u1ec3 th\u1ea5y t\u1eeb bi\u1ec3u \u0111\u1ed3 r\u1eb1ng \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i t\u0103ng x\u1ea5p x\u1ec9 tuy\u1ebfn t\u00ednh v\u1edbi m\u1ee9c t\u0103ng c\u1ee7a AP khi AP nh\u1ecf h\u01a1n 15 micron. Nh\u01b0ng khi AP> 15 um, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m d\u1ea7n khi t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft, \u0111i\u1ec1u n\u00e0y r\u00f5 r\u00e0ng kh\u00e1c v\u1edbi k\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m m\u00e0i c\u1ee7a cacbua xi m\u0103ng c\u1ea5u tr\u00fac truy\u1ec1n th\u1ed1ng.<\/p>

\"th\u00f4ng<\/figure>

\u0110\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t l\u00e0 s\u1ef1 ph\u1ea3n \u00e1nh tr\u1ef1c ti\u1ebfp c\u1ee7a h\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t m\u00e0i. \u0110\u1ec3 ph\u00e2n t\u00edch nguy\u00ean nh\u00e2n c\u1ee7a c\u00e1c th\u00f4ng s\u1ed1 tr\u00ean \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn, h\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t c\u1ee7a m\u1eabu m\u00e0i \u0111\u01b0\u1ee3c quan s\u00e1t b\u1eb1ng SEM b\u1eb1ng m\u00e1y d\u00f2 \u0111i\u1ec7n t\u1eed ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c. H\u00ecnh 3 cho th\u1ea5y h\u00ecnh \u1ea3nh \u0111i\u1ec7n t\u1eed ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c c\u1ee7a h\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a m\u1eb7t \u0111\u1ea5t m\u1eabu v\u1edbi c\u00e1c b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng kh\u00e1c nhau d\u01b0\u1edbi c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft. Nh\u01b0 c\u00f3 th\u1ec3 th\u1ea5y t\u1eeb h\u00ecnh v\u1ebd, c\u00e1c v\u1ebft m\u00e0i tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn b\u1eb1ng b\u00e1nh m\u00e0i W20 r\u1ea5t h\u1eb9p v\u00e0 n\u00f4ng, \u0111\u00e1y v\u00e0 hai b\u00ean nh\u1eb5n, v\u00e0 c\u00e1c \u0111\u01b0\u1eddng l\u00ean \u1edf hai b\u00ean r\u1ea5t nh\u1ecf (xem H\u00ecnh 3a). Sau khi m\u00e0i v\u1edbi \u0111\u00e1 m\u00e0i 280 #, c\u00e1c v\u1ebft n\u1ee9t xu\u1ea5t hi\u1ec7n tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i. C\u00e1c v\u1ebft m\u00e0i r\u1ed9ng v\u00e0 s\u00e2u, v\u00e0 \u0111\u00e1y v\u00e0 c\u00e1c c\u1ea1nh \u0111\u1ec1u g\u1ed3 gh\u1ec1 v\u1edbi c\u1ea5u tr\u00fac g\u00e3y c\u00f3 v\u1ea3y (xem h\u00ecnh 3b). Sau khi m\u00e0i v\u1edbi b\u00e1nh m\u00e0i 150 #, m\u1eb7c d\u00f9 \u0111\u1ed9 s\u00e2u c\u1ee7a v\u1ebft m\u00e0i tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i t\u01b0\u01a1ng \u0111\u1ed1i n\u00f4ng, c\u00f3 nhi\u1ec1u m\u1ea3nh v\u1ee5n v\u00e0 c\u1ea5u tr\u00fac g\u00e3y (xem H\u00ecnh 3c), cho th\u1ea5y c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m g\u00e3y gi\u00f2n r\u00f5 r\u00e0ng.<\/p>

Ph\u00e2n t\u00edch v\u00e0 th\u1ea3o lu\u1eadn<\/strong><\/strong><\/h2>

Vi\u1ec7c m\u00e0i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn Ch\u1ea5t m\u00e0i m\u00f2n c\u00f3 \u0111\u1ed9 c\u1ee9ng cao \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp ng\u1eabu nhi\u00ean tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a \u0111\u00e1 m\u00e0i. M\u1ed7i h\u1ea1t m\u00e0i m\u00f2n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t m\u00e1y c\u1eaft nh\u1ecf kho\u1ea3ng. B\u1ec1 m\u1eb7t m\u00e0i \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh b\u1edfi s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a nhi\u1ec1u c\u1ea1nh vi c\u1eaft kh\u00f4ng \u0111\u1ec1u n\u00e0y tr\u00ean b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u \u0111\u1ea5t. Do \u0111\u00f3, k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i, \u0111\u1ed9 s\u00e2u c\u1eaft v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u n\u1ec1n ch\u1eafc ch\u1eafn s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u00ecnh th\u00e1i b\u1ec1 m\u1eb7t m\u00e0i, v\u00e0 sau \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i.<\/p>

Tr\u01b0\u1edbc khi th\u1eed nghi\u1ec7m, c\u00e1c m\u00e0i m\u00f2n kim c\u01b0\u01a1ng s\u1eafc n\u00e9t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n h\u00f3a th\u00e0nh h\u00ecnh n\u00f3n v\u00ec c\u00f9ng m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p v\u00e0 v\u1eadt li\u1ec7u thay th\u1ebf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ed7i b\u00e1nh xe. \u0110\u1ed3ng th\u1eddi, do \u0111\u1ed9 c\u1ee9ng cao c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e1y m\u00e0i v\u00e0 hi\u1ec7u qu\u1ea3 l\u00e0m m\u00e1t c\u1ee7a ch\u1ea5t l\u1ecfng m\u00e0i, bi\u1ebfn d\u1ea1ng nhi\u1ec7t c\u1ee7a b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng ti\u1ebfp x\u00fac v\u1edbi m\u1eabu trong qu\u00e1 tr\u00ecnh m\u00e0i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c b\u1ecf qua v\u00e0 \u0111\u1ed9 s\u00e2u c\u1eaft th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng \u0111\u1eb7t \u0111\u1ed9 s\u00e2u c\u1eaft c\u1ee7a b\u00e1nh m\u00e0i. Sau \u0111\u00f3, trong qu\u00e1 tr\u00ecnh m\u00e0i m\u1eb7t ph\u1eb3ng, l\u1ef1c m\u00e0i xuy\u00ean t\u00e2m Fp t\u00e1c d\u1ee5ng b\u1edfi \u0111\u00e1 m\u00e0i v\u00e0 \u0111\u1ed9 d\u00e0y c\u1eaft t\u1ed1i \u0111a c\u1ee7a m\u1ed9t h\u1ea1t m\u00e0i m\u00f2n c\u00f3 th\u1ec3 thu \u0111\u01b0\u1ee3c theo c\u00f4ng th\u1ee9c (1) v\u00e0 c\u00f4ng th\u1ee9c (2).<\/p>

\"th\u00f4ng<\/figure>

Trong c\u00f4ng th\u1ee9c, CF l\u00e0 m\u1ed9t h\u1eb1ng s\u1ed1 li\u00ean quan \u0111\u1ebfn lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c nghi\u1ec1n; Vw l\u00e0 t\u1ed1c \u0111\u1ed9 ph\u00f4i, m \/ ph\u00fat; Vc l\u00e0 t\u1ed1c \u0111\u1ed9 c\u1ee7a b\u00e1nh m\u00e0i, m \/ s; B l\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a m\u00e0i, mm; theta l\u00e0 n\u1eeda g\u00f3c c\u1ee7a \u0111\u1ec9nh h\u00ecnh n\u00f3n c\u1ee7a h\u1ea1t m\u00e0i m\u00f2n; AP l\u00e0 \u0111\u1ed9 s\u00e2u c\u1eaft \u0111\u1eb7t, micron; FA l\u00e0 th\u1ee9c \u0103n d\u1ecdc tr\u1ee5c, mm; m l\u00e0 s\u1ed1 h\u1ea1t m\u00e0i m\u00f2n hi\u1ec7u qu\u1ea3 tr\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch c\u1ee7a \u0111\u00e1 m\u00e0i. D l\u00e0 \u0111\u01b0\u1eddng k\u00ednh b\u00e1nh m\u00e0i, mm.<\/p>

C\u01a1 ch\u1ebf lo\u1ea1i b\u1ecf c\u00e1c v\u1eadt li\u1ec7u c\u1ee9ng v\u00e0 gi\u00f2n nh\u01b0 cacbua xi m\u0103ng v\u00e0 g\u1ed1m th\u01b0\u1eddng bao g\u1ed3m lo\u1ea1i b\u1ecf bi\u1ebfn d\u1ea1ng kh\u00f4ng \u0111\u00e0n h\u1ed3i, lo\u1ea1i b\u1ecf gi\u00f2n v\u00e0 b\u1ed9t v\u1eadt li\u1ec7u, vv N\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n l\u1ef1c c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i trong qu\u00e1 tr\u00ecnh m\u00e0i. Khi t\u1ea3i tr\u1ecdng b\u00ecnh th\u01b0\u1eddng tr\u00ean b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u m\u1eb7t \u0111\u1ea5t b\u00ean d\u01b0\u1edbi h\u1ea1t m\u00e0i m\u00f2n th\u1ea5p h\u01a1n gi\u00e1 tr\u1ecb t\u1edbi h\u1ea1n c\u1ee7a v\u1ebft n\u1ee9t trong v\u1eadt li\u1ec7u, v\u1eadt li\u1ec7u m\u1eb7t \u0111\u1ea5t \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf b\u1eb1ng bi\u1ebfn d\u1ea1ng kh\u00f4ng \u0111\u00e0n h\u1ed3i nh\u01b0 tr\u01b0\u1ee3t, c\u00e0y v\u00e0 h\u00ecnh th\u00e0nh chip. Khi t\u1ea3i tr\u1ecdng b\u00ecnh th\u01b0\u1eddng tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i v\u01b0\u1ee3t qu\u00e1 t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng m\u00e0 tr\u00ean \u0111\u00f3 x\u1ea3y ra v\u1ebft n\u1ee9t v\u1eadt li\u1ec7u, v\u1ebft n\u1ee9t s\u1ebd t\u1ea1o m\u1ea7m v\u00e0 d\u1ea7n d\u1ea7n m\u1edf r\u1ed9ng ra b\u1ec1 m\u1eb7t m\u00e0i, v\u00e0 v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf b\u1eb1ng c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n gi\u00f2n nh\u01b0 bong tr\u00f3c v\u00e0 ph\u00e2n m\u1ea3nh. Pha c\u1ee9ng h\u01a1n trong v\u1eadt li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c nghi\u1ec1n th\u00e0nh b\u1ed9t d\u01b0\u1edbi t\u1ea3i tr\u1ecdng l\u1edbn h\u01a1n b\u00ecnh th\u01b0\u1eddng. Pha li\u00ean k\u1ebft c\u00f3 \u0111\u1ed9 c\u1ee9ng th\u1ea5p s\u1ebd \u0111\u01b0\u1ee3c ph\u1ee7 l\u00ean b\u1ec1 m\u1eb7t c\u1ee7a pha c\u1ee9ng b\u1ed9t v\u00e0 lo\u1ea1i b\u1ecf m\u1ed9t ph\u1ea7n b\u1eb1ng c\u00e1c m\u1ea3nh v\u1ee5n pha c\u1ee9ng.<\/p>

Trong qu\u00e1 tr\u00ecnh nghi\u1ec1n cacbua xi m\u0103ng, t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng quan tr\u1ecdng \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi c\u00e1c v\u1ebft n\u1ee9t v\u00e0 m\u1ea3nh v\u1ee5n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng<\/p>

\"th\u00f4ng<\/figure>

Trong c\u00f4ng th\u1ee9c, lambda l\u00e0 h\u1eb1ng s\u1ed1 to\u00e0n di\u1ec7n, lambda_2 * 105; H l\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u1eadt li\u1ec7u; Kc l\u00e0 \u0111\u1ed9 d\u1ebbo dai g\u00e3y x\u01b0\u01a1ng. C\u00f4ng th\u1ee9c (1) cho th\u1ea5y trong c\u00f9ng \u0111i\u1ec1u ki\u1ec7n m\u00e0i nh\u01b0 t\u1ed1c \u0111\u1ed9 b\u00e1nh xe, t\u1ed1c \u0111\u1ed9 ph\u00f4i, chi\u1ec1u r\u1ed9ng m\u00e0i v\u00e0 c\u1ea5p li\u1ec7u tr\u1ee5c, l\u1ef1c m\u00e0i th\u00f4ng th\u01b0\u1eddng Fp tr\u00ean b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u m\u1eb7t \u0111\u1ea5t t\u1ef7 l\u1ec7 v\u1edbi \u0111\u1ed9 s\u00e2u c\u1eaft v\u00e0 t\u0103ng tuy\u1ebfn t\u00ednh khi t\u0103ng ap ; C\u00f4ng th\u1ee9c (2) cho th\u1ea5y vi\u1ec7c c\u1eaft t\u1ed1i \u0111a m\u1ed9t h\u1ea1t m\u00e0i m\u00f2n duy nh\u1ea5t \u0111\u00e3 \u0111\u1ea1t \u0111\u01b0\u1ee3c. \u0110\u1ed9 d\u00e0y t\u0103ng khi t\u0103ng AP v\u00e0 gi\u1ea3m khi t\u0103ng s\u1ed1 l\u01b0\u1ee3ng m\u00e0i m\u00f2n hi\u1ec7u qu\u1ea3 M.<\/p>

Trong th\u00ed nghi\u1ec7m n\u00e0y, d\u01b0\u1edbi c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft (t\u1ee9c l\u00e0 c\u00f9ng Fp), t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng g\u00e2y ra b\u1edfi m\u1ed9t m\u00e0i m\u00f2n duy nh\u1ea5t tr\u00ean b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u m\u1eb7t \u0111\u1ea5t c\u0169ng kh\u00e1c nhau do k\u00edch th\u01b0\u1edbc h\u1ea1t kh\u00e1c nhau c\u1ee7a b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng. Do m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn ch\u1ea5t m\u00e0i m\u00f2n hi\u1ec7u qu\u1ea3, t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng t\u00e1c \u0111\u1ed9ng b\u1edfi m\u1ed9t ch\u1ea5t m\u00e0i m\u00f2n duy nh\u1ea5t tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i l\u00e0 nh\u1ecf. Do \u0111\u00f3, khi cacbua xi m\u0103ng si\u00eau m\u1ecbn \u0111\u01b0\u1ee3c nghi\u1ec1n b\u1eb1ng b\u00e1nh m\u00e0i W20, ch\u1ebf \u0111\u1ed9 lo\u1ea1i b\u1ecf c\u1ee7a n\u00f3 ch\u1ee7 y\u1ebfu l\u00e0 bi\u1ebfn d\u1ea1ng kh\u00f4ng \u0111\u00e0n h\u1ed3i. \u0110\u1ed3ng th\u1eddi, do m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn v\u1eadt li\u1ec7u m\u00e0i m\u00f2n hi\u1ec7u qu\u1ea3, \u0111\u1ed9 d\u00e0y c\u1eaft t\u1ed1i \u0111a c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u m\u00e0i m\u00f2n t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf, v\u00e0 ch\u1ec9 c\u00f3 ma s\u00e1t v\u00e0 c\u00e0y nh\u1eb9 x\u1ea3y ra tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i, do \u0111\u00f3 b\u1ec1 m\u1eb7t m\u00e0i c\u00f3 c\u00e1c v\u1ebft m\u00e0i h\u1eb9p v\u00e0 n\u00f4ng, n\u00e2ng l\u00ean nh\u1ecf h\u01a1n (xem h\u00ecnh 3a) v\u00e0 \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t th\u1ea5p h\u01a1n. V\u1edbi s\u1ef1 gia t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i, s\u1ed1 l\u01b0\u1ee3ng m\u00e0i m\u00f2n hi\u1ec7u qu\u1ea3 gi\u1ea3m v\u00e0 t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng t\u00e1c \u0111\u1ed9ng b\u1edfi m\u1ed9t m\u00e0i m\u00f2n duy nh\u1ea5t tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i t\u0103ng. Khi t\u1ea3i tr\u1ecdng l\u1edbn h\u01a1n t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng c\u1ee7a m\u1ea3nh v\u1ee1 c\u1ee7a v\u1eadt li\u1ec7u cacbua xi m\u0103ng si\u00eau m\u1ecbn, c\u00e1c v\u1ebft n\u1ee9t v\u00e0 v\u1ebft n\u1ee9t b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i (xem h\u00ecnh 3b). V\u1edbi s\u1ef1 gia t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i, m\u1ee9c \u0111\u1ed9 n\u1ee9t tr\u1edf n\u00ean nghi\u00eam tr\u1ecdng h\u01a1n (xem h\u00ecnh 3c). C\u00e1ch lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u ch\u00ednh l\u00e0 lo\u1ea1i b\u1ecf gi\u00f2n. So v\u1edbi ma s\u00e1t tr\u01b0\u1ee3t v\u00e0 l\u01b0\u1ee1i c\u00e0y nh\u1eb9, v\u1ebft n\u1ee9t v\u00e0 v\u1ebft n\u1ee9t l\u00e0m gi\u1ea3m nghi\u00eam tr\u1ecdng \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i, \u0111\u01b0\u1ee3c ph\u1ea3n \u00e1nh trong gi\u00e1 tr\u1ecb \u0111o c\u1ee7a \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t. \u0110\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m khi t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i (xem h\u00ecnh 1). Ch\u00ednh x\u00e1c l\u00e0 do s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ph\u00e1p lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u m\u00e0 \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i thay \u0111\u1ed5i r\u1ea5t l\u1edbn khi m\u00e0i v\u1edbi b\u00e1nh m\u00e0i W20.<\/p>

Khi m\u00e0i v\u1edbi c\u00f9ng m\u1ed9t b\u00e1nh m\u00e0i v\u00e0 \u0111\u1ed9 s\u00e2u c\u1eaft kh\u00e1c nhau, l\u1ef1c m\u00e0i th\u00f4ng th\u01b0\u1eddng Fp c\u1ee7a b\u00e1nh m\u00e0i t\u0103ng khi t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft, v\u00e0 t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i t\u0103ng khi t\u0103ng h\u1ea1t m\u00e0i \u0111\u01a1n, l\u00e0m cho ch\u1ebf \u0111\u1ed9 lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a thay \u0111\u1ed5i cacbua si\u00eau m\u1ecbn. Khi \u0111\u1ed9 s\u00e2u c\u1eaft AP nh\u1ecf h\u01a1n 5 micron, t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng t\u00e1c \u0111\u1ed9ng b\u1edfi m\u1ed9t h\u1ea1t m\u00e0i m\u00f2n duy nh\u1ea5t tr\u00ean b\u1ec1 m\u1eb7t m\u00e0i l\u00e0 nh\u1ecf. Ch\u1ebf \u0111\u1ed9 lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u trong qu\u00e1 tr\u00ecnh m\u00e0i ch\u1ee7 y\u1ebfu l\u00e0 c\u00e0y trong bi\u1ebfn d\u1ea1ng kh\u00f4ng \u0111\u00e0n h\u1ed3i, t\u1ea1o ra c\u00e1c v\u1ebft m\u00e0i s\u00e2u tr\u00ean b\u1ec1 m\u1eb7t v\u00e0 c\u00f3 \u0111\u1ed9 n\u00e2ng cao h\u01a1n \u1edf c\u1ea3 hai m\u1eb7t. Khi AP (> 10 um), ch\u1ebf \u0111\u1ed9 lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u d\u1ea7n d\u1ea7n chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 lo\u1ea1i b\u1ecf gi\u00f2n, d\u1eabn \u0111\u1ebfn c\u00e1c v\u1ebft n\u1ee9t v\u00e0 v\u1ebft n\u1ee9t tr\u00ean b\u1ec1 m\u1eb7t, ng\u00e0y c\u00e0ng nghi\u00eam tr\u1ecdng h\u01a1n khi t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft, do \u0111\u00f3 \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i t\u0103ng d\u1ea7n theo t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft. Tuy nhi\u00ean, khi AP> 15 micron, v\u1eadt li\u1ec7u b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua xi m\u0103ng si\u00eau m\u1ecbn b\u1eaft \u0111\u1ea7u b\u1ed9t v\u00e0 \u0111\u01b0\u1ee3c l\u00e0m nh\u1eb5n b\u1eb1ng pha Co, v\u00e0 gi\u00e1 tr\u1ecb \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m d\u1ea7n (xem h\u00ecnh 1).<\/p>

Theo c\u00f4ng th\u1ee9c (3), t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng quan tr\u1ecdng c\u1ee7a qu\u00e1 tr\u00ecnh t\u1ea1o m\u1ea7m n\u1ee9t c\u1ee7a cacbua xi m\u0103ng c\u00f3 li\u00ean quan \u0111\u1ebfn t\u00ednh ch\u1ea5t v\u1eadt l\u00fd v\u00e0 c\u01a1 h\u1ecdc c\u1ee7a ch\u00ednh v\u1eadt li\u1ec7u. \u0110\u1ed9 b\u1ec1n g\u00e3y c\u00e0ng cao ho\u1eb7c \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u1eadt li\u1ec7u c\u00e0ng th\u1ea5p th\u00ec t\u1ea3i tr\u1ecdng th\u00f4ng th\u01b0\u1eddng quan tr\u1ecdng c\u1ee7a v\u1ebft n\u1ee9t b\u1ec1 m\u1eb7t m\u00e0i. So v\u1edbi c\u1ea5u tr\u00fac cacbua xi m\u0103ng th\u00f4ng th\u01b0\u1eddng v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t WC l\u1edbn h\u01a1n, cacbua xi m\u0103ng si\u00eau m\u1ecbn c\u00f3 \u0111\u1ed9 c\u1ee9ng cao h\u01a1n v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y th\u1ea5p h\u01a1n, v\u00e0 Pc c\u1ee7a n\u00f3 nh\u1ecf h\u01a1n nhi\u1ec1u trong qu\u00e1 tr\u00ecnh nghi\u1ec1n. Trong c\u00f9ng \u0111i\u1ec1u ki\u1ec7n m\u00e0i, b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn d\u1ec5 s\u1ea3n xu\u1ea5t b\u1ed9t h\u01a1n. Do \u0111\u00f3, khi \u0111\u1ed9 s\u00e2u c\u1eaft \u0111\u1ea1t \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ecbnh, \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m d\u1ea7n v\u00e0 Pc nh\u1ecf h\u01a1n nhi\u1ec1u trong qu\u00e1 tr\u00ecnh m\u00e0i. Trong c\u00f9ng \u0111i\u1ec1u ki\u1ec7n m\u00e0i, b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn d\u1ec5 s\u1ea3n xu\u1ea5t b\u1ed9t h\u01a1n. Do \u0111\u00f3, khi \u0111\u1ed9 s\u00e2u c\u1eaft \u0111\u1ea1t \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ecbnh, \u0111\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m d\u1ea7n.<\/p>

K\u1ebft lu\u1eadn<\/strong><\/strong><\/h2>

(1) D\u01b0\u1edbi c\u00f9ng \u0111\u1ed9 s\u00e2u c\u1eaft, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i c\u1ee7a cacbua xi m\u0103ng si\u00eau m\u1ecbn t\u0103ng khi t\u0103ng k\u00edch th\u01b0\u1edbc b\u00e1nh m\u00e0i. \u0110\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t th\u1ea5p khi m\u00e0i b\u1eb1ng b\u00e1nh m\u00e0i kim c\u01b0\u01a1ng m\u1ecbn.<\/p>

(2) Khi m\u00e0i v\u1edbi b\u00e1nh m\u00e0i c\u00f3 c\u00f9ng k\u00edch th\u01b0\u1edbc, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua xi m\u0103ng si\u00eau m\u1ecbn t\u0103ng khi t\u0103ng \u0111\u1ed9 s\u00e2u c\u1eaft. Khi \u0111\u1ed9 s\u00e2u c\u1eaft t\u0103ng \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ecbnh, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t m\u00e0i gi\u1ea3m d\u1ea7n.<\/p>

(3) \u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c th\u00f4ng s\u1ed1 m\u00e0i \u0111\u1ebfn \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t c\u1ee7a m\u00e0i cacbua si\u00eau m\u1ecbn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c quy cho s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ph\u00e1p lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u trong qu\u00e1 tr\u00ecnh m\u00e0i.<\/p>

\u0110\u00e2y l\u00e0 t\u00e0i li\u1ec7u c\u1ee7a tu\u1ea7n n\u00e0y. T\u00f4i hy v\u1ecdng n\u00f3 s\u1ebd h\u1eefu \u00edch cho b\u1ea1n.<\/p><\/div>","protected":false},"excerpt":{"rendered":"

Hey everybody, a new material weekly on surface grinding of ultra-fine cemented carbides. Reading this probably cost you about 15 minutes Abstract of this article: The grinding experiment of superfine cemented carbide was carried out on a plane grinder with diamond grinding wheel. The grinding surface morphology was observed by scanning electron microscopy and the surface roughness…<\/p>","protected":false},"author":2,"featured_media":19452,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79],"tags":[],"class_list":["post-18363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-weekly"],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2019\/07\/1-1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/18363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/comments?post=18363"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/18363\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media\/19452"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=18363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=18363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=18363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}