{"id":1629,"date":"2019-05-22T02:47:32","date_gmt":"2019-05-22T02:47:32","guid":{"rendered":"http:\/\/www.meetyoucarbide.com\/single-post-what-is-sintering-and-hot-pressing\/"},"modified":"2020-05-04T13:12:08","modified_gmt":"2020-05-04T13:12:08","slug":"what-is-sintering-and-hot-pressing","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/nung-ket-la-gi-va-ep-nong\/","title":{"rendered":"Thi\u00eau k\u1ebft v\u00e0 \u00e9p n\u00f3ng l\u00e0 g\u00ec?"},"content":{"rendered":"
\n
\n
Qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft l\u00e0 nung b\u1ed9t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh v\u00e0 sau \u0111\u00f3 l\u00e0m l\u1ea1nh v\u1eadt li\u1ec7u \u0111\u1ec3 thu \u0111\u01b0\u1ee3c s\u1ea3n ph\u1ea9m c\u00f3 c\u00e1c \u0111\u1eb7c t\u00ednh mong mu\u1ed1n. To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t \u0111\u1eb7c bi\u1ec7t n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thi\u00eau k\u1ebft.<\/div>\n
Qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft cho ph\u00e9p b\u1ed9t x\u1ed1p tr\u1edf th\u00e0nh s\u1ea3n ph\u1ea9m c\u1ee7a m\u1ed9t k\u1ebft c\u1ea5u v\u00e0 t\u00ednh ch\u1ea5t nh\u1ea5t \u0111\u1ecbnh. M\u1eb7c d\u00f9 c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a s\u1ea3n ph\u1ea9m c\u00f3 li\u00ean quan \u0111\u1ebfn nhi\u1ec1u y\u1ebfu t\u1ed1 tr\u01b0\u1edbc khi thi\u00eau k\u1ebft, nh\u01b0ng trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 ho\u1eb7c th\u1eadm ch\u00ed chi ph\u1ed1i \u0111\u1ebfn t\u1ed5 ch\u1ee9c v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng.<\/div>\n
Theo nguy\u00ean t\u1eafc ph\u00e2n lo\u1ea1i c\u1ee7a luy\u1ec7n kim b\u1ed9t v\u1ec1 thi\u00eau k\u1ebft, thi\u00eau k\u1ebft cacbua xi m\u0103ng thu\u1ed9c v\u1ec1 thi\u00eau k\u1ebft l\u1ecfng nhi\u1ec1u pha. T\u1eeb quan \u0111i\u1ec3m c\u1ee7a c\u00e1c \u0111\u1eb7c t\u00ednh qu\u00e1 tr\u00ecnh c\u1ee7a qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, vi\u1ec7c thi\u00eau k\u1ebft cacbua xi m\u0103ng c\u00f3 th\u1ec3 b\u1eb1ng b\u1ea3o v\u1ec7 hydro, thi\u00eau k\u1ebft ch\u00e2n kh\u00f4ng, thi\u00eau k\u1ebft \u00e9p n\u00f3ng, \u00e9p \u0111\u1eb3ng nhi\u1ec7t n\u00f3ng, v\u00e0 t\u01b0\u01a1ng t\u1ef1.<\/div>\n

\"\"<\/h2>\n

Thay \u0111\u1ed5i c\u01a1 th\u1ec3 thi\u00eau k\u1ebft trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft<\/h2>\n
Sau khi thi\u00eau k\u1ebft kh\u1ed1i cacbua xi m\u0103ng, s\u1ef1 thay \u0111\u1ed5i d\u1ec5 th\u1ea5y nh\u1ea5t l\u00e0 s\u1ef1 co r\u00fat th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i nh\u1ecf g\u1ecdn, c\u01b0\u1eddng \u0111\u1ed9 t\u0103ng v\u00e0 b\u1ec1 m\u1eb7t c\u1ee7a h\u1ee3p kim th\u1ec3 hi\u1ec7n \u00e1nh kim. Th\u00f4ng th\u01b0\u1eddng, m\u00e1y compact c\u00f3 \u0111\u1ed9 x\u1ed1p kho\u1ea3ng 50%, trong khi b\u00e0i vi\u1ebft th\u01b0\u1eddng ph\u1ea3i nh\u1ecf h\u01a1n 0,2%, g\u1ea7n nh\u01b0 ho\u00e0n to\u00e0n d\u00e0y \u0111\u1eb7c. Tr\u01b0\u1edbc khi thi\u00eau k\u1ebft, kh\u1ed1i \u00e9p c\u0169ng ph\u1ea3i \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u1eb9 \u0111\u1ec3 tr\u00e1nh thi\u1ec7t h\u1ea1i trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t. Trong khi c\u00e1c s\u1ea3n ph\u1ea9m thi\u00eau k\u1ebft c\u00f3 s\u1ee9c m\u1ea1nh \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c kh\u00e1c nhau.<\/div>\n
Kh\u00e1c v\u1edbi qu\u00e1 tr\u00ecnh t\u1ea1o b\u1ed9t, s\u1ef1 thay \u0111\u1ed5i t\u00ednh ch\u1ea5t thi\u00eau k\u1ebft cho th\u1ea5y c\u00f3 s\u1ef1 thay \u0111\u1ed5i v\u1ec1 ch\u1ea5t gi\u1eefa c\u00e1c h\u1ea1t b\u1ed9t trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft - \u0111\u00f3 l\u00e0 s\u1ef1 li\u00ean k\u1ebft c\u1ee7a c\u00e1c h\u1ea1t h\u1ee3p kim thay th\u1ebf s\u1ef1 ti\u1ebfp x\u00fac gi\u1eefa c\u00e1c h\u1ea1t b\u1ed9t l\u00e0m cho h\u1ee3p kim t\u1ea1o th\u00e0nh m\u1ed9t c\u01a1 th\u1ec3 r\u1eafn ch\u1eafc, do \u0111\u00f3 h\u00ecnh th\u00e0nh t\u00ednh ch\u1ea5t v\u1eadt l\u00fd v\u00e0 c\u01a1 h\u1ecdc tuy\u1ec7t v\u1eddi.<\/div>\n
M\u1ed9t s\u1ed1 giai \u0111o\u1ea1n c\u1ee7a qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft<\/div>\n
Qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft cacbua xi m\u0103ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh b\u1ed1n giai \u0111o\u1ea1n c\u01a1 b\u1ea3n.<\/div>\n

1. Lo\u1ea1i b\u1ecf t\u00e1c nh\u00e2n h\u00ecnh th\u00e0nh v\u00e0 giai \u0111o\u1ea1n \u0111\u1ed1t tr\u01b0\u1edbc (<800 \u00b0 C)<\/h3>\n
Trong giai \u0111o\u1ea1n \u0111\u1ea7u ti\u00ean, hoop thi\u00eau k\u1ebft thay \u0111\u1ed5i nh\u01b0 sau:<\/div>\n
1) Lo\u1ea1i b\u1ecf c\u00e1c t\u00e1c nh\u00e2n h\u00ecnh th\u00e0nh. \u1ede giai \u0111o\u1ea1n ban \u0111\u1ea7u c\u1ee7a qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, t\u00e1c nh\u00e2n h\u00ecnh th\u00e0nh d\u1ea7n d\u1ea7n b\u1ecb n\u1ee9t (nh\u01b0 cao su) ho\u1eb7c b\u1ed1c h\u01a1i (nh\u01b0 parafin) v\u00e0 lo\u1ea1i tr\u1eeb c\u01a1 th\u1ec3 thi\u00eau k\u1ebft. \u0110\u1ed3ng th\u1eddi, t\u00e1c nh\u00e2n h\u00ecnh th\u00e0nh \u00edt nhi\u1ec1u C\u01a1 th\u1ec3 thi\u00eau k\u1ebft \u0111\u01b0\u1ee3c cacbon h\u00f3a.<\/div>\n
2) Gi\u1ea3m oxit b\u1ec1 m\u1eb7t b\u1ed9t. Khi thi\u00eau k\u1ebft trong hydro, hydro c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m oxit coban v\u00e0 vonfram. Khi thi\u00eau k\u1ebft ch\u00e2n kh\u00f4ng, s\u1ef1 kh\u1eed cacbon \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y kh\u00f4ng m\u1ea1nh.<\/div>\n
3) Tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c h\u1ea1t b\u1ed9t thay \u0111\u1ed5i v\u1edbi nhau. \u1ede nhi\u1ec7t \u0111\u1ed9 n\u00e0y, \u1ee9ng su\u1ea5t ti\u1ebfp x\u00fac gi\u1eefa c\u00e1c h\u1ea1t b\u1ed9t \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf d\u1ea7n, b\u1ed9t kim lo\u1ea1i li\u00ean k\u1ebft b\u1eaft \u0111\u1ea7u ph\u1ee5c h\u1ed3i v\u00e0 k\u1ebft tinh l\u1ea1i, c\u00e1c h\u1ea1t b\u1eaft \u0111\u1ea7u khu\u1ebfch t\u00e1n tr\u00ean b\u1ec1 m\u1eb7t v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a n\u00e9n \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n.<\/div>\n

\"\"<\/p>\n

2. Giai \u0111o\u1ea1n thi\u00eau k\u1ebft pha r\u1eafn (800 \u00b0 C ~ nhi\u1ec7t \u0111\u1ed9 eutectic)<\/h3>\n
Nhi\u1ec7t \u0111\u1ed9 eutectic \u0111\u1ec1 c\u1eadp \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 m\u00e0 pha l\u1ecfng eutectic b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n trong c\u01a1 th\u1ec3 thi\u00eau k\u1ebft khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng d\u1ea7n v\u00e0 \u0111\u1ed1i v\u1edbi WC-Co, nhi\u1ec7t \u0111\u1ed9 eutectic t\u1ea1i th\u1eddi \u0111i\u1ec3m thi\u00eau k\u1ebft c\u00e2n b\u1eb1ng l\u00e0 1340%.<\/div>\n
\u1ede nhi\u1ec7t \u0111\u1ed9 tr\u01b0\u1edbc khi pha l\u1ecfng xu\u1ea5t hi\u1ec7n, ngo\u00e0i qu\u00e1 tr\u00ecnh ti\u1ebfp t\u1ee5c \u1edf giai \u0111o\u1ea1n tr\u01b0\u1edbc, m\u1ed9t s\u1ed1 ph\u1ea3n \u1ee9ng pha r\u1eafn trong c\u01a1 th\u1ec3 thi\u00eau k\u1ebft \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng, t\u1ed1c \u0111\u1ed9 khu\u1ebfch t\u00e1n t\u0103ng l\u00ean, v\u00e0 d\u00f2ng ch\u1ea3y c\u1ee7a c\u00e1c h\u1ea1t \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng, do \u0111\u00f3 c\u01a1 th\u1ec3 thi\u00eau k\u1ebft th\u1ec3 hi\u1ec7n s\u1ef1 co r\u00fat \u0111\u00e1ng k\u1ec3.<\/div>\n

3. Giai \u0111o\u1ea1n thi\u00eau k\u1ebft pha l\u1ecfng (nhi\u1ec7t \u0111\u1ed9 eutectic ~ nhi\u1ec7t \u0111\u1ed9 thi\u00eau k\u1ebft)<\/h3>\n
Khi pha l\u1ecfng c\u1ee7a c\u01a1 th\u1ec3 thi\u00eau k\u1ebft xu\u1ea5t hi\u1ec7n, s\u1ef1 co l\u1ea1i c\u1ee7a c\u01a1 th\u1ec3 thi\u00eau k\u1ebft \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh nhanh ch\u00f3ng, v\u00e0 c\u00e1c h\u1ea1t cacbua ph\u00e1t tri\u1ec3n v\u00e0 t\u1ea1o th\u00e0nh m\u1ed9t b\u1ed9 x\u01b0\u01a1ng, do \u0111\u00f3 \u0111\u1eb7t c\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a h\u1ee3p kim.<\/div>\n

4. Giai \u0111o\u1ea1n l\u00e0m m\u00e1t (nhi\u1ec7t \u0111\u1ed9 thi\u00eau k\u1ebft ~ nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng)<\/h3>\n
\u1ede giai \u0111o\u1ea1n n\u00e0y, th\u00e0nh ph\u1ea7n pha c\u1ea5u tr\u00fac v\u00e0 ch\u1ea5t k\u1ebft d\u00ednh c\u1ee7a h\u1ee3p kim thay \u0111\u1ed5i ph\u1ea7n n\u00e0o t\u00f9y thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n l\u00e0m m\u00e1t. Sau khi l\u00e0m m\u00e1t, m\u1ed9t h\u1ee3p kim c\u1ee7a c\u1ea5u tr\u00fac vi m\u00f4 cu\u1ed1i c\u00f9ng thu \u0111\u01b0\u1ee3c.<\/div>\n
<\/div>\n

V\u1ec1 \u00e9p n\u00f3ng<\/h2>\n
\u00c9p n\u00f3ng l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh trong \u0111\u00f3 nh\u1ea5n v\u00e0 thi\u00eau k\u1ebft \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ed3ng th\u1eddi. Ngo\u00e0i vi\u1ec7c s\u1eed d\u1ee5ng th\u00f4ng th\u01b0\u1eddng c\u1ee7a c\u00f4ng ngh\u1ec7 gia nhi\u1ec7t \u0111i\u1ec7n tr\u1edf v\u00e0 s\u01b0\u1edfi \u1ea5m c\u1ea3m \u1ee9ng, c\u00f2n c\u00f3 c\u00e1c quy tr\u00ecnh v\u00e0 thi\u1ebft b\u1ecb m\u1edbi nh\u01b0 \u00e9p n\u00f3ng ch\u00e2n kh\u00f4ng, \u00e9p n\u00f3ng rung, c\u00e2n b\u1eb1ng \u00e9p n\u00f3ng, \u00e9p \u0111\u1eb3ng \u00e1p.<\/div>\n

\"\"<\/p>\n

1. C\u01a1 ch\u1ebf t\u0103ng m\u1eadt \u0111\u1ed9 c\u1ee7a qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng<\/h3>\n
Qu\u00e1 tr\u00ecnh trong \u0111\u00f3 b\u1ed9t c\u1ee7a t\u00e1c nh\u00e2n b\u1ed5 sung cu\u1ed1i c\u00f9ng \u0111\u01b0\u1ee3c \u0111\u1eb7t trong m\u1ed9t m\u00e1y nghi\u1ec1n than ch\u00ec \u0111\u1ec3 qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft v\u00e0 \u00e9p \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ed3ng th\u1eddi \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u00e9p n\u00f3ng.<\/div>\n
M\u1eb7c d\u00f9 qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ed3ng th\u1eddi v\u1edbi hai qu\u00e1 tr\u00ecnh \u00e9p v\u00e0 thi\u00eau k\u1ebft, nh\u01b0ng kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 nguy\u00ean t\u1eafc so v\u1edbi qu\u00e1 tr\u00ecnh t\u1ea1o h\u00ecnh v\u00e0 thi\u00eau k\u1ebft th\u00f4ng th\u01b0\u1eddng. T\u1eeb quan \u0111i\u1ec3m c\u1ee7a hi\u1ec7u \u1ee9ng, \u00e9p n\u00f3ng r\u00fat ng\u1eafn \u0111\u00e1ng k\u1ec3 qu\u00e1 tr\u00ecnh chuy\u1ec3n pha v\u00e0 th\u1eddi gian h\u00ecnh th\u00e0nh h\u1ee3p kim. Do \u0111\u00f3, c\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t. Qu\u00e1 tr\u00ecnh c\u00f4 \u0111\u1eb7c c\u1ee7a c\u00e1c h\u1ee3p kim \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1edfi hai ph\u01b0\u01a1ng ph\u00e1p s\u1ea3n xu\u1ea5t \u0111\u00e3 \u0111\u01b0\u1ee3c so s\u00e1nh. T\u1eeb \u0111\u01b0\u1eddng cong th\u1eddi gian thi\u00eau k\u1ebft m\u1eadt \u0111\u1ed9 h\u1ee3p kim, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft m\u1ea5t 1-2 gi\u1edd \u0111\u1ec3 ho\u00e0n th\u00e0nh, v\u00e0 ch\u1ec9 m\u1ea5t 3 \u0111\u1ebfn 10 ph\u00fat \u0111\u1ec3 nh\u1ea5n n\u00f3ng.<\/div>\n
Qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft trong qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh m\u1ea5t c\u00e2n b\u1eb1ng cao. Khi b\u1ed9t h\u1ed7n h\u1ee3p \u0111\u01b0\u1ee3c nung n\u00f3ng li\u00ean t\u1ee5c d\u01b0\u1edbi \u00e1p su\u1ea5t, m\u00e0ng oxit tr\u00ean b\u1ec1 m\u1eb7t b\u1ed9t b\u1ecb v\u1ee1 d\u01b0\u1edbi \u00e1p su\u1ea5t v\u00e0 c\u00f3 th\u1ec3 gi\u1ea3m b\u1eb1ng carbon. Tuy nhi\u00ean, kh\u00f4ng gi\u1ed1ng nh\u01b0 qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng kh\u00f4ng c\u00f3 \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 c\u00e2n b\u1eb1ng \u0111\u1ed9 h\u00f2a tan c\u1ee7a WC trong Co v\u00e0 qu\u00e1 tr\u00ecnh k\u1ebft tinh l\u1ea1i qua pha l\u1ecfng kh\u00f4ng x\u1ea3y ra trong qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng. Do \u0111\u00f3, \u0111\u1ed9 co c\u1ee7a s\u1ea3n ph\u1ea9m \u00e9p n\u00f3ng kh\u00e1c v\u1edbi ph\u01b0\u01a1ng ph\u00e1p thi\u00eau k\u1ebft th\u00f4ng th\u01b0\u1eddng.<\/div>\n
B\u00ean c\u1ea1nh \u0111\u00f3, m\u1ed9t s\u1ed1 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng s\u1ef1 co ng\u00f3t c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m \u00e9p n\u00f3ng l\u00e0 do qu\u00e1 tr\u00ecnh d\u00f2ng ch\u1ea3y. Tr\u01b0\u1edbc khi xu\u1ea5t hi\u1ec7n pha l\u1ecfng, n\u00f3 ch\u1ee7 y\u1ebfu d\u1ef1a v\u00e0o d\u00f2ng ch\u1ea3y nh\u1ef1a. Khi pha l\u1ecfng xu\u1ea5t hi\u1ec7n, s\u1ef1 li\u00ean k\u1ebft l\u1ea1i c\u1ee7a c\u00e1c h\u1ea1t cacbua d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a \u00e1p su\u1ea5t c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u00f2ng pha l\u1ecfng, do \u0111\u00f3, s\u1ef1 n\u00e9n ch\u1eb7t \u0111\u01b0\u1ee3c k\u00fd h\u1ee3p \u0111\u1ed3ng. V\u00ec th\u1eddi gian \u00e9p n\u00f3ng l\u00e0 ng\u1eafn, n\u00ean vi\u1ec7c khu\u1ebfch t\u00e1n v\u00e0 k\u1ebft tinh l\u1ea1i r\u1ea5t kh\u00f3 th\u1ef1c hi\u1ec7n.<\/div>\n
Ngo\u00e0i nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1p su\u1ea5t th\u00fac \u0111\u1ea9y s\u1ef1 co ng\u00f3t c\u1ee7a qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, th\u1eddi gian gi\u1eef c\u0169ng c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u1eadt \u0111\u1ed9 c\u1ee7a s\u1ea3n ph\u1ea9m \u00e9p n\u00f3ng. Nhi\u1ec7t \u0111\u1ed9 c\u00e0ng cao, l\u1ef1c m\u1eaft c\u00e0ng l\u1edbn, \u0111\u1ed9 co r\u00fat c\u1ee7a m\u00e1y compact c\u00e0ng m\u1ea1nh theo th\u1eddi gian khi b\u1eaft \u0111\u1ea7u \u00e9p n\u00f3ng v\u00e0 th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u1eadt \u0111\u1ed9 g\u1ea7n nh\u01b0 ng\u1eebng ho\u00e0n to\u00e0n. Khi \u0111\u1ea1t \u0111\u1ebfn th\u1eddi gian gi\u1eef nh\u1ea5t \u0111\u1ecbnh, m\u1eadt \u0111\u1ed9 c\u1ee7a than b\u00e1nh s\u1ebd kh\u00f4ng c\u00f2n ti\u1ebfp t\u1ee5c t\u0103ng n\u1eefa v\u00e0 vi\u1ec7c k\u00e9o d\u00e0i th\u1eddi gian gi\u1eef s\u1ebd l\u00e0 v\u00f4 ngh\u0129a.<\/div>\n
Ngo\u00e0i ra, b\u1ed9t c\u00f3 khuy\u1ebft t\u1eadt tinh th\u1ec3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1eadt \u0111\u1ed9 h\u1ee3p kim l\u1edbn h\u01a1n v\u00ec s\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a khuy\u1ebft t\u1eadt c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng.<\/div>\n

\"\"<\/p>\n

2. c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng<\/h3>\n
Qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng mang l\u1ea1i cho s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh m\u1ed9t l\u1ee3i th\u1ebf \u0111\u1ed9c nh\u1ea5t. Do \u0111\u00f3, qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u00f3ng vai tr\u00f2 ch\u00ednh trong vi\u1ec7c s\u1ea3n xu\u1ea5t cacbua xi m\u0103ng. C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0.<\/div>\n
a. S\u1ea3n ph\u1ea9m \u00e9p n\u00f3ng c\u00f3 m\u1eadt \u0111\u1ed9 cao v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1t. \u0110\u1ed9 x\u1ed1p c\u1ee7a s\u1ea3n ph\u1ea9m \u00e9p n\u00f3ng l\u00e0 c\u1ef1c k\u1ef3 th\u1ea5p v\u00e0 m\u1eadt \u0111\u1ed9 g\u1ea7n nh\u01b0 \u0111\u1ea1t \u0111\u1ebfn gi\u00e1 tr\u1ecb l\u00fd thuy\u1ebft. \u0110\u1ed3ng th\u1eddi, do th\u1eddi gian \u00e9p n\u00f3ng ng\u1eafn, c\u00e1c h\u1ea1t cacbua kh\u00f4ng ph\u00e1t tri\u1ec3n do qu\u00e1 tr\u00ecnh k\u1ebft tinh l\u1ea1i, do \u0111\u00f3 carbon s\u1ea3n ph\u1ea9m m\u1ecbn h\u01a1n c\u00e1c h\u1ea1t tinh th\u1ec3 vonfram, l\u00e0m cho s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c \u00e9p n\u00f3ng c\u00f3 \u0111\u1ed9 c\u1ee9ng cao h\u01a1n v\u00e0 ch\u1ed1ng m\u00e0i m\u00f2n t\u1ed1t h\u01a1n , \u0111\u1eb7c bi\u1ec7t n\u00f3 ph\u00f9 h\u1ee3p \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c c\u00f4ng c\u1ee5 ch\u00ednh x\u00e1c nh\u01b0 cu\u1ed9n ch\u00ednh x\u00e1c v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn hao m\u00f2n c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/div>\n
b. \u00c1p l\u1ef1c \u00e9p l\u00e0 nh\u1ecf, v\u00e0 n\u00f3 c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c s\u1ea3n ph\u1ea9m quy m\u00f4 l\u1edbn. \u00c1p l\u1ef1c \u00e9p \u0111\u01a1n v\u1ecb c\u1ea7n thi\u1ebft cho \u00e9p n\u00f3ng ch\u1ec9 b\u1eb1ng m\u1ed9t ph\u1ea7n m\u01b0\u1eddi c\u1ee7a \u00e9p l\u1ea1nh. H\u01a1n n\u1eefa, k\u00edch th\u01b0\u1edbc c\u1ee7a s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng b\u1eb1ng c\u00e1ch h\u00e0n, v\u00e0 do \u0111\u00f3, k\u00edch th\u01b0\u1edbc c\u1ee7a s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c \u00e9p n\u00f3ng b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi c\u00f4ng su\u1ea5t c\u1ee7a m\u00e1y \u00e9p nh\u1ecf h\u01a1n \u00e1p su\u1ea5t l\u1ea1nh.<\/div>\n
Hi\u1ec7n t\u1ea1i, tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m cacbua xi m\u0103ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u00e9p n\u00f3ng c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi v\u00e0i ch\u1ee5c kg ho\u1eb7c th\u1eadm ch\u00ed h\u00e0ng tr\u0103m kg.<\/div>\n
c.It c\u00f3 th\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c s\u1ea3n ph\u1ea9m v\u1edbi h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p. Do \u00e9p n\u00f3ng, c\u00e1c v\u1eadt li\u1ec7u b\u1ed9t c\u00f3 t\u00ednh d\u1ebbo nhi\u1ec7t v\u00e0 t\u00ednh l\u01b0u \u0111\u1ed9ng t\u1ed1t, v\u00ec v\u1eady ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o th\u00e0nh c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p, ch\u1eb3ng h\u1ea1n nh\u01b0 \u1ed1ng c\u00f3 th\u00e0nh m\u1ecfng v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m nh\u01b0 xi lanh b\u00f3ng. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ea3nh d\u00e0i, v\u1eabn c\u00f3 tr\u01b0\u1eddng h\u1ee3p m\u1eadt \u0111\u1ed9 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, v\u00e0 c\u00e1c ph\u1ea7n d\u00e0i h\u00e0n th\u01b0\u1eddng \u0111\u01b0\u1ee3c h\u00e0n kh\u00f4ng \u0111\u1ec1u.<\/div>\n
d. N\u00f3 c\u00f3 th\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c s\u1ea3n ph\u1ea9m k\u00edch th\u01b0\u1edbc l\u1edbn v\u00e0 kh\u00f4ng b\u1ecb bi\u1ebfn d\u1ea1ng. Ph\u01b0\u01a1ng ph\u00e1p \u00e9p n\u00f3ng kh\u1eafc ph\u1ee5c nh\u1eefng thi\u1ebfu s\u00f3t c\u1ee7a bi\u1ebfn d\u1ea1ng \u00e9p l\u1ea1nh v\u00e0 thi\u00eau k\u1ebft, v\u00e0 c\u00f3 th\u1ec3 thu \u0111\u01b0\u1ee3c c\u00e1c m\u1ea3nh d\u00e0i m\u00e0 kh\u00f4ng c\u1ea7n u\u1ed1n cong v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m r\u1ed7ng v\u1edbi k\u00edch th\u01b0\u1edbc t\u01b0\u01a1ng \u0111\u1ed1i ch\u00ednh x\u00e1c. Tuy nhi\u00ean, do \u00e9p n\u00f3ng, coban b\u1ecb \u0111\u00f9n ra kh\u1ecfi b\u1ec1 m\u1eb7t s\u1ea3n ph\u1ea9m, \u0111i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 g\u00e2y ra s\u1ef1 m\u1ea5t coban (1 \u0111\u1ebfn 3%) m\u00e0 c\u00f2n l\u00e0m cho b\u1ec1 m\u1eb7t c\u1ee7a s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c \u00e9p n\u00f3ng tr\u1edf n\u00ean th\u00f4 r\u00e1p, kh\u00f3 l\u00e0m s\u1ea1ch v\u00e0 x\u1eed l\u00fd.<\/div>\n
e. Th\u00edch h\u1ee3p cho s\u1ea3n xu\u1ea5t m\u1ed9t m\u1ea3nh. D\u1ee5ng c\u1ee5 \u00e9p n\u00f3ng r\u1ea5t d\u1ec5 s\u1ea3n xu\u1ea5t v\u00e0 c\u00f3 chu k\u1ef3 s\u1ea3n xu\u1ea5t ng\u1eafn, v\u00ec v\u1eady ch\u00fang \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p cho s\u1ea3n xu\u1ea5t m\u1ed9t m\u1ea3nh ho\u1eb7c kh\u1ed1i l\u01b0\u1ee3ng nh\u1ecf r\u1ea5t c\u1ea7n thi\u1ebft.<\/div>\n
f. N\u0103ng su\u1ea5t th\u1ea5p v\u00e0 chi ph\u00ed cao. Ph\u01b0\u01a1ng ph\u00e1p \u00e9p n\u00f3ng ch\u1ec9 c\u00f3 th\u1ec3 s\u1ea3n xu\u1ea5t m\u1ed9t \u0111\u1ebfn v\u00e0i s\u1ea3n ph\u1ea9m c\u00f9ng m\u1ed9t l\u00fac. Chi ph\u00ed khu\u00f4n cao v\u00e0 tu\u1ed5i th\u1ecd ng\u1eafn. Do \u0111\u00f3, n\u00f3 kh\u00f4ng ph\u00f9 h\u1ee3p cho s\u1ea3n xu\u1ea5t quy m\u00f4 l\u1edbn. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t ph\u01b0\u01a1ng ph\u00e1p thi\u00eau k\u1ebft l\u1ea1nh. s\u1ea3n ph\u1ea9m.<\/div>\n
g. C\u00f4ng ngh\u1ec7 v\u1eadn h\u00e0nh cao l\u00e0 c\u1ea7n thi\u1ebft. Trong qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng, s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1p su\u1ea5t, t\u0103ng nhi\u1ec7t \u0111\u1ed9 v\u00e0 t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t v\u00e0 ki\u1ec3m so\u00e1t co ng\u00f3t \u0111\u00f3ng vai tr\u00f2 quy\u1ebft \u0111\u1ecbnh \u0111\u1ed1i v\u1edbi hi\u1ec7u su\u1ea5t v\u00e0 khuy\u1ebft t\u1eadt c\u1ee7a s\u1ea3n ph\u1ea9m. Do \u0111\u00f3, ng\u01b0\u1eddi v\u1eadn h\u00e0nh \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ph\u1ea3i c\u00f3 tr\u00ecnh \u0111\u1ed9 k\u1ef9 n\u0103ng cao.<\/div>\n
M\u1ed9t \u0111i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd l\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a \u00e9p n\u00f3ng c\u00e2n b\u1eb1ng v\u00e0 \u00e9p n\u00f3ng \u0111\u1eb3ng \u00e1p kh\u1eafc ph\u1ee5c m\u1ed9t s\u1ed1 thi\u1ebfu s\u00f3t c\u1ee7a qu\u00e1 tr\u00ecnh \u00e9p n\u00f3ng.<\/div>\n<\/div>\n<\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Sintering is the heating of a powder to a certain temperature for a certain period of time and then cooling the material to obtain a product of the desired properties. This whole process of the special heat treatment is called sintering. Sintering enables porous powder compacts to become the product of a certain texture and…<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79],"tags":[],"class_list":["post-1629","post","type-post","status-publish","format-standard","hentry","category-materials-weekly"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/1629","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=1629"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/1629\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=1629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=1629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=1629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}