{"id":13993,"date":"2020-04-29T08:55:28","date_gmt":"2020-04-29T08:55:28","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=13993"},"modified":"2021-10-11T06:08:04","modified_gmt":"2021-10-11T06:08:04","slug":"present-research-on-main-kinds-of-wc-based-composites","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/present-research-on-main-kinds-of-wc-based-composites\/","title":{"rendered":"Nghi\u00ean c\u1ee9u hi\u1ec7n t\u1ea1i v\u1ec1 c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1ed5ng h\u1ee3p d\u1ef1a tr\u00ean WC"},"content":{"rendered":"

Cacbua xi m\u0103ng l\u00e0 m\u1ed9t lo\u1ea1i cacbua xi m\u0103ng \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb qu\u00e1 tr\u00ecnh luy\u1ec7n kim b\u1ed9t t\u1eeb h\u1ee3p ch\u1ea5t c\u1ee9ng c\u1ee7a kim lo\u1ea1i ch\u1ecbu l\u1eeda v\u00e0 kim lo\u1ea1i li\u00ean k\u1ebft. B\u1edfi v\u00ec \u0111\u1ed9 c\u1ee9ng v\u00e0 s\u1ee9c m\u1ea1nh t\u1ed1t c\u1ee7a n\u00f3, n\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c. V\u1edbi y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a v\u1eadt li\u1ec7u cacbua xi m\u0103ng ng\u00e0y c\u00e0ng cao, hi\u1ec7u su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u cacbua xi m\u0103ng hi\u1ec7n t\u1ea1i kh\u00f3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u s\u1eed d\u1ee5ng. Trong 30 n\u0103m qua, nhi\u1ec1u h\u1ecdc gi\u1ea3 \u0111\u00e3 th\u1ef1c hi\u1ec7n nghi\u00ean c\u1ee9u th\u1eed nghi\u1ec7m c\u00e1c h\u1ee3p ch\u1ea5t d\u1ef1a tr\u00ean WC v\u00e0 thu \u0111\u01b0\u1ee3c m\u1ed9t lo\u1ea1t k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u.<\/p>

Kim lo\u1ea1i WC<\/strong><\/strong><\/h2>

WC-Co<\/strong><\/strong><\/h3>

V\u1eadt li\u1ec7u xi m\u0103ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong cacbua vonfram l\u00e0 coban. H\u1ec7 th\u1ed1ng WC Co \u0111\u00e3 \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u r\u1ed9ng r\u00e3i. Vi\u1ec7c b\u1ed5 sung CO l\u00e0m cho WC c\u00f3 \u0111\u1ed9 \u1ea9m v\u00e0 \u0111\u1ed9 b\u00e1m d\u00ednh t\u1ed1t. Ngo\u00e0i ra, nh\u01b0 trong H\u00ecnh 13.2, vi\u1ec7c b\u1ed5 sung CO c\u0169ng c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 s\u1ee9c m\u1ea1nh v\u00e0 \u0111\u1ed9 d\u1ebbo dai.<\/p>

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H\u00ecnh 13.3 M\u00e1y vi t\u00ednh \u0111i\u1ec7n t\u1eed t\u00e1n x\u1ea1 ng\u01b0\u1ee3c c\u1ee7a b\u1ed9t WC Co cho th\u1ea5y c\u1ea5u tr\u00fac b\u00ean ngo\u00e0i v\u00e0 m\u1eb7t c\u1eaft ngang: (a), (b) F8; (c), (d) M8; v\u00e0 (E), (f) C8.<\/p>

\u00d4ng \u0111\u00e3 th\u1ef1c hi\u1ec7n h\u00ecnh \u1ea3nh \u0111i\u1ec7n t\u1eed t\u00e1n x\u1ea1 ng\u01b0\u1ee3c c\u1ee7a b\u1ed9t F8, M8 v\u00e0 C8 v\u00e0 c\u00e1c ph\u1ea7n \u0111\u01b0\u1ee3c \u0111\u00e1nh b\u00f3ng c\u1ee7a ch\u00fang. N\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c quan s\u00e1t th\u1ea5y r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i b\u1ed9t c\u00f3 h\u00ecnh d\u1ea1ng h\u00ecnh c\u1ea7u \u0111i\u1ec3n h\u00ecnh. B\u1ed9t F8 cho th\u1ea5y s\u1ef1 t\u00edch t\u1ee5 d\u00e0y \u0111\u1eb7c c\u1ee7a c\u00e1c cacbua m\u1ecbn, trong khi b\u1ed9t M8 v\u00e0 C8 cho th\u1ea5y c\u1ea5u tr\u00fac t\u00edch l\u0169y t\u01b0\u01a1ng \u0111\u1ed1i l\u1ecfng l\u1ebbo v\u1edbi m\u1ed9t s\u1ed1 l\u1ed7 ch\u00e2n l\u00f4ng. Tr\u00ean ph\u1ea7n \u0111\u00e1nh b\u00f3ng, t\u1ea5t c\u1ea3 c\u00e1c m\u1eabu cho th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n x\u1ea1 r\u00f5 r\u00e0ng, v\u00e0 \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi h\u00e0m l\u01b0\u1ee3ng coban. \u0110\u1ed9 c\u1ee9ng Vickers (HV) thay \u0111\u1ed5i t\u1eeb 1500 \u0111\u1ebfn 2000 HV30, v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y dao \u0111\u1ed9ng t\u1eeb 7 \u0111\u1ebfn 15 MPa M1 \/ 2. S\u1ef1 thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 n\u00e0y l\u00e0 m\u1ed9t ch\u1ee9c n\u0103ng c\u1ee7a th\u00e0nh ph\u1ea7n cacbua, c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 \u0111\u1ed9 tinh khi\u1ebft h\u00f3a h\u1ecdc.<\/p>

N\u00f3i chung, k\u00edch th\u01b0\u1edbc h\u1ea1t c\u00e0ng nh\u1ecf th\u00ec \u0111\u1ed9 c\u1ee9ng c\u00e0ng cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u00e0ng t\u1ed1t. T\u1ef7 l\u1ec7 th\u1ec3 t\u00edch c\u1ee7a CO c\u00e0ng cao th\u00ec \u0111\u1ed9 b\u1ec1n g\u00e3y c\u00e0ng cao, nh\u01b0ng \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u00e0ng th\u1ea5p (Jia et al., 2007). Do \u0111\u00f3, \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n, thay v\u00e0o \u0111\u00f3, kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u xi m\u0103ng kh\u00e1c.<\/p>

M\u1eb7t kh\u00e1c, v\u00ec nh\u1eefng l\u00fd do tr\u00ean, n\u00f3 kh\u00f4ng khoa h\u1ecdc trong chi\u1ebfn l\u01b0\u1ee3c v\u00e0 d\u1ec5 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn xu h\u01b0\u1edbng gi\u00e1 c\u1ea3. Ngo\u00e0i ra, s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa WC v\u00e0 b\u1ee5i \u0111\u1ed3ng l\u00e0 \u0111\u00e1ng lo ng\u1ea1i v\u00ec ch\u00fang g\u00e2y ch\u1ebft ng\u01b0\u1eddi nhi\u1ec1u h\u01a1n b\u1ea5t k\u1ef3 vi\u1ec7c s\u1eed d\u1ee5ng n\u00e0o.<\/p>

WC-Ni<\/strong><\/strong><\/h3>

Niken r\u1ebb h\u01a1n v\u00e0 d\u1ec5 ki\u1ebfm h\u01a1n coban. N\u00f3 c\u00f3 m\u1ed9t t\u00e0i s\u1ea3n c\u1ee9ng r\u1eafn t\u1ed1t. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t \u0103n m\u00f2n \/ oxy h\u00f3a, \u0111\u1ed9 b\u1ec1n nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ch\u1ed1ng m\u00e0i m\u00f2n trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t. So v\u1edbi h\u1ee3p kim WC Co, \u0111\u1ed9 d\u1ebbo c\u1ee7a v\u1eadt li\u1ec7u th\u1ea5p h\u01a1n. B\u1edfi v\u00ec niken h\u00f2a tan t\u1ed1t trong WC, n\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m ch\u1ea5t k\u1ebft d\u00ednh cho ch\u1ea5t n\u1ec1n WC, d\u1eabn \u0111\u1ebfn li\u00ean k\u1ebft m\u1ea1nh m\u1ebd gi\u1eefa ch\u00fang.<\/p>

WC-Ag<\/strong><\/strong><\/h3>

Vi\u1ec7c b\u1ed5 sung Ag l\u00e0m cho WC tr\u1edf th\u00e0nh m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u ch\u1ed1ng h\u1ed3 quang. D\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a d\u00f2ng qu\u00e1 t\u1ea3i, WC th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ea3i trong c\u00e1c thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c quy cho \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac \u0111i\u1ec7n (RC) n\u1ed5i ti\u1ebfng sau n\u00e0y. \u0110i\u1ec1u \u0111\u00e1ng n\u00f3i l\u00e0 \u0111i\u1ec7n tr\u1edf su\u1ea5t c\u1ee7a h\u1ed7n h\u1ee3p WC Ag gi\u1ea3m khi t\u0103ng h\u00e0m l\u01b0\u1ee3ng Ag v\u00e0 \u0111\u1ed9 c\u1ee9ng gi\u1ea3m khi t\u0103ng h\u00e0m l\u01b0\u1ee3ng Ag, \u0111i\u1ec1u n\u00e0y l\u00e0 do s\u1ef1 kh\u00e1c bi\u1ec7t l\u1edbn gi\u1eefa \u0111\u1ed9 c\u1ee9ng c\u1ee7a WC v\u00e0 Ag. Ngo\u00e0i ra, c\u00e1c h\u1ea1t WC th\u00f4 c\u00f3 s\u1ee9c \u0111\u1ec1 kh\u00e1ng ti\u1ebfp x\u00fac r\u1ea5t th\u1ea5p v\u00e0 \u1ed5n \u0111\u1ecbnh.<\/p>

H\u00ecnh 13.4 cho th\u1ea5y \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac \u0111i\u1ec7n trung b\u00ecnh (RC) \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi c\u00f4ng t\u1eafc<\/p>

Chu k\u1ef3 11e50 v\u1edbi h\u00e0m l\u01b0\u1ee3ng b\u1ea1c v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t WC kh\u00e1c nhau, b\u1edfi v\u00ec RC c\u1ee7a h\u1ea7u h\u1ebft c\u00e1c v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c quan s\u00e1t l\u00e0 \u1ed5n \u0111\u1ecbnh sau 10 chu k\u1ef3 chuy\u1ec3n \u0111\u1ed5i. \u0110i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac c\u1ee7a b\u1ea1c n\u1eb1m trong kho\u1ea3ng t\u1eeb 50-55 wt% (t\u1ef7 l\u1ec7 th\u1ec3 t\u00edch 60% v\u00e0 64.6%) trong WC v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t l\u00e0 4 mm v\u00e0 t\u1eeb 55-60 wt% (t\u1ef7 l\u1ec7 th\u1ec3 t\u00edch 64.6% v\u00e0 69%) trong WC v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t 0,8 v\u00e0 1,5 mm. Do \u0111\u00f3, \u0111i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh th\u00e0nh ph\u1ea7n ban \u0111\u1ea7u c\u1ee7a kho\u1ea3n \u0111\u1ea7u t\u01b0, trong \u0111\u00f3 ma tr\u1eadn Ag \u0111\u01b0\u1ee3c li\u00ean k\u1ebft ho\u00e0n to\u00e0n. \u0110\u1ed1i v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1 \u0111\u1ecbnh, s\u1ef1 gi\u1ea3m \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac gi\u1eefa k\u00edch th\u01b0\u1edbc h\u1ea1t WC 1,5 \u0111\u1ebfn 4 mm \u0111\u00e3 \u0111\u01b0\u1ee3c quan s\u00e1t, c\u0169ng \u0111\u00e1nh d\u1ea5u ng\u01b0\u1ee1ng th\u1ea5m.<\/p>

WC-Re<\/strong><\/strong><\/h3>
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C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111ang s\u1eed d\u1ee5ng cacbua vonfram \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng rheni \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n WC Co, b\u1edfi v\u00ec RE c\u00f3 th\u1ec3 mang l\u1ea1i \u0111\u1ed9 c\u1ee9ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 s\u1ef1 k\u1ebft h\u1ee3p t\u1ed1t<\/p>

H\u00ecnh 13.4 t\u1ef7 l\u1ec7 c\u1ee7a \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac \u0111i\u1ec7n trung b\u00ecnh \u1edf h\u00e0m l\u01b0\u1ee3ng Ag kh\u00e1c nhau v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t WC so v\u1edbi \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac c\u1ee7a ch\u1ea5t n\u1ec1n WC trong chu k\u1ef3 11 \u0111\u1ebfn 50 l\u00e0 co ho\u1eb7c Ni. Theo \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a WC coere (h\u00e0m l\u01b0\u1ee3ng RE 20%), \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 r\u1eb1ng WC coere gi\u1eef l\u1ea1i trong CO v\u00e0 ti\u1ebfp t\u1ee5c h\u00ecnh th\u00e0nh c\u1ea5u tr\u00fac HCP, do \u0111\u00f3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a h\u1ee3p kim. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u0169ng t\u0103ng c\u01b0\u1eddng l\u1ea1i trong WC Ni v\u00e0 t\u00ecm th\u1ea5y nh\u1eefng suy lu\u1eadn t\u01b0\u01a1ng t\u1ef1. Do \u0111\u1ed9 c\u1ee9ng cao nh\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n g\u1ea5p \u0111\u00f4i c\u1ee7a WC Co, h\u1ee3p kim \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c b\u1ed9 ph\u1eadn c\u00f4ng c\u1ee5 c\u1ea1nh tranh. Khi \u00e9p l\u1ea1nh WC v\u00e0 b\u1ed9t Re theo quy tr\u00ecnh \u00e9p n\u00f3ng \u0111\u01b0\u1ee3c c\u1ea5p b\u1eb1ng s\u00e1ng ch\u1ebf, h\u01a1n 2400 kg \/ mm ~ 2 c\u1ee7a HV \u0111\u00e3 \u0111\u01b0\u1ee3c quan s\u00e1t (so v\u1edbi 1700 kg \/ mm ~ 2 \u0111\u1ed1i v\u1edbi WC-Co)<\/p>

WC \u0111\u1ed1i x\u1ee9ng<\/strong><\/h2>

WC-FeAl<\/strong><\/h3>

Trong v\u00e0i th\u1eadp k\u1ef7 qua, c\u00e1c h\u1ee3p ch\u1ea5t intermetallic nh\u01b0 ch\u1ea5t k\u1ebft d\u00ednh g\u1ed1m \u0111\u00e3 thu h\u00fat s\u1ef1 ch\u00fa \u00fd c\u1ee7a m\u1ecdi ng\u01b0\u1eddi. S\u1eaft aluminide c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a v\u00e0 ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi, \u0111\u1ed9c t\u00ednh th\u1ea5p, \u0111\u1ed9 c\u1ee9ng cao, ch\u1ed1ng m\u00e0i m\u00f2n t\u1ed1t, \u1ed5n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9 \u1ea9m t\u1ed1t. N\u00f3 l\u00e0 nhi\u1ec7t \u0111\u1ed9ng ph\u00f9 h\u1ee3p cho WC nh\u01b0 ch\u1ea5t k\u1ebft d\u00ednh. \u0110\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y c\u1ee7a WC FeAl v\u00e0 WC Co v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 gi\u1ed1ng nhau. \u0110\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00f2n c\u1ee7a h\u1ee3p kim WC Co t\u01b0\u01a1ng t\u1ef1 nh\u01b0 h\u1ee3p kim WC Co th\u00f4ng th\u01b0\u1eddng. C\u00f3 th\u1ec3 xem x\u00e9t r\u1eb1ng n\u1ebfu k\u00edch th\u01b0\u1edbc h\u1ea1t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a, c\u00f3 th\u1ec3 thay th\u1ebf C\u00f4ng ty WC truy\u1ec1n th\u1ed1ng \u0110\u01b0\u1eddng cong ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a b\u1ed9t h\u1ed7n h\u1ee3p WC FeAl \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf b\u1eb1ng c\u00e1c qu\u00e1 tr\u00ecnh nghi\u1ec1n v\u00e0 \/ ho\u1eb7c s\u1ea5y b\u00f3ng kh\u00e1c nhau \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong H\u00ecnh 13,5. Ba \u0111\u01b0\u1eddng cong trong h\u00ecnh 13,5 c\u00f3 ph\u00e2n b\u1ed1 l\u01b0\u1ee1ng kim. Trong h\u00ecnh 13,5, \u0111\u1ec9nh tr\u00e1i c\u1ee7a k\u00edch th\u01b0\u1edbc h\u1ea1t nh\u1ecf h\u01a1n t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111\u1ec9nh tr\u00e1i c\u1ee7a h\u1ea1t WC \u0111\u01a1n. Gi\u00e1 tr\u1ecb \u0111\u1ec9nh ch\u00ednh x\u00e1c c\u1ee7a k\u00edch th\u01b0\u1edbc h\u1ea1t l\u1edbn h\u01a1n t\u01b0\u01a1ng \u1ee9ng v\u1edbi gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a c\u00e1c m\u1ea3nh FeAl ch\u1ee9a m\u1ed9t s\u1ed1 h\u1ea1t WC. Khi \u0111\u1ec9nh ch\u00ednh x\u00e1c di chuy\u1ec3n, \u0111\u1ec9nh tr\u00e1i kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o qu\u00e1 tr\u00ecnh nghi\u1ec1n v\u00e0 \/ ho\u1eb7c s\u1ea5y. \u0110\u1ec9nh ch\u00ednh x\u00e1c c\u1ee7a b\u1ed9t DR (ethanol \u0111\u00e3 kh\u1eed n\u01b0\u1edbc l\u00e0m dung m\u00f4i \u0111\u1ec3 l\u00e0m kh\u00f4 nhanh) chuy\u1ec3n sang \u0111\u1ec9nh t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai lo\u1ea1i b\u1ed9t c\u00f2n l\u1ea1i.<\/p>

\"\"<\/figure>

H\u00ecnh 13,5 Ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a b\u1ed9t h\u1ed7n h\u1ee3p WC-FeAl \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf t\u1eeb c\u00e1c quy tr\u00ecnh b\u1ed9t kh\u00e1c nhau.<\/p>

WC-g\u1ed1m<\/strong><\/strong><\/h2>

WC-MgO<\/strong><\/strong><\/h3>
\"\"<\/figure>

V\u1eadt li\u1ec7u composite Wc-mgo \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i do vi\u1ec7c b\u1ed5 sung c\u00e1c h\u1ea1t MgO trong ma tr\u1eadn WC, \u00edt \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 d\u1ebbo dai c\u1ee7a v\u1eadt li\u1ec7u. \u0110\u1ed9 c\u1ee9ng t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111\u1ed9 b\u1ec1n, nh\u01b0ng trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a h\u1ee3p kim n\u00e0y, \u0111\u1ed9 b\u1ec1n c\u00f3 \u0111\u01b0\u1ee3c khi \u0111\u1ed9 m\u1ea5t \u0111\u1ed9 c\u1ee9ng r\u1ea5t nh\u1ecf. Th\u00eam m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf VC, Cr3C2 v\u00e0 c\u00e1c ch\u1ea5t \u1ee9c ch\u1ebf t\u0103ng tr\u01b0\u1edfng h\u1ea1t kh\u00e1c v\u00e0o v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u kh\u00f4ng ch\u1ec9 c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t s\u1ef1 t\u0103ng tr\u01b0\u1edfng c\u1ee7a h\u1ea1t trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft m\u00e0 c\u00f2n c\u1ea3i thi\u1ec7n t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u.<\/p>

WC-Al2O3<\/strong><\/strong><\/h3>

\u1ede \u0111\u00e2y ph\u1ea3i \u0111\u1ec1 c\u1eadp r\u1eb1ng Al 2 O 3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u gia c\u1ed1 cho WC v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, v\u00ec c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 l\u00fd tuy\u1ec7t v\u1eddi c\u1ee7a ch\u00fang.<\/p>

Nhi\u1ec7t \u0111\u1ed9 thi\u00eau k\u1ebft v\u00e0 th\u1eddi gian gi\u1eef c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a h\u1ed7n h\u1ee3p wc-40vol% Al2O3. V\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 thi\u00eau k\u1ebft v\u00e0 th\u1eddi gian gi\u1eef, m\u1eadt \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t t\u0103ng l\u00ean. \u0110\u1ed3ng th\u1eddi, c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a \u00e1p l\u1ef1c cao v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y x\u01b0\u01a1ng t\u0103ng tr\u01b0\u1edbc v\u00e0 sau \u0111\u00f3 gi\u1ea3m. C\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a \u0111\u01b0\u1eddng n\u1ee9t cho th\u1ea5y s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a c\u1ea7u n\u1ee9t v\u00e0 \u0111\u1ed9 l\u1ec7ch v\u1ebft n\u1ee9t. Trong v\u1eadt li\u1ec7u t\u1ed5ng h\u1ee3p wc-40vol% Al 2O 3, c\u01a1 ch\u1ebf l\u00e0m c\u1ee9ng ch\u00ednh l\u00e0 t\u1ea1o ra c\u00e1c v\u1ebft n\u1ee9t th\u1ee9 c\u1ea5p v\u00e0 b\u00ean. M\u1ed9t nghi\u00ean c\u1ee9u kh\u00e1c cho th\u1ea5y HV kho\u1ea3ng 20e25gpa v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y l\u00e0 5e6mpa.m1 \/ 2.<\/p>

H\u00ecnh 13.6 cho th\u1ea5y xu h\u01b0\u1edbng bi\u1ebfn \u0111\u1ed5i c\u1ee7a \u0111\u1ed9 c\u1ee9ng, \u0111\u1ed9 b\u1ec1n g\u00e3y v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y ngang v\u1edbi h\u00e0m l\u01b0\u1ee3ng alumina. C\u1ea7n l\u01b0u \u00fd r\u1eb1ng nh\u1eefng gi\u00e1 tr\u1ecb n\u00e0y kh\u00e1 kh\u00e1c bi\u1ec7t v\u1edbi nh\u1eefng gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o (Mao et al., 2015). WC nguy\u00ean ch\u1ea5t c\u00f3 \u0111\u1ed9 c\u1ee9ng cao nh\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y th\u1ea5p nh\u1ea5t. Vi\u1ec7c b\u1ed5 sung Al2O3 gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u1ed9 b\u1ec1n g\u00e3y, nh\u01b0ng \u0111\u1ed9 c\u1ee9ng c\u1ee7a alumina tinh khi\u1ebft th\u1ea5p h\u01a1n so v\u1edbi WC nguy\u00ean ch\u1ea5t v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a composite wc-al2o3 gi\u1ea3m. C\u00e1c k\u1ebft qu\u1ea3 kh\u00e1c nhau trong H\u00ecnh 13.6 cho th\u1ea5y c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc kh\u00f4ng ch\u1ec9 ph\u1ee5 thu\u1ed9c v\u00e0o h\u00e0m l\u01b0\u1ee3ng alumina, m\u00e0 c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t v\u00e0 c\u1ea5p ch\u1ea5t n\u1ec1n kh\u00e1c nhau. <\/p>

WC m\u00e0i m\u00f2n<\/strong><\/strong><\/h2>

WC cBN<\/strong><\/strong><\/h3>

Do CBN c\u00f3 \u0111\u1ed9 c\u1ee9ng tuy\u1ec7t v\u1eddi, \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t v\u00e0 ho\u1ea1t \u0111\u1ed9ng ph\u1ea3n \u1ee9ng v\u1edbi s\u1eaft, vi\u1ec7c th\u00eam CBN v\u00e0o WC Co c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n, \u0111\u1ed9 c\u1ee9ng v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u. Khi CBN \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng v\u00e0o ma tr\u1eadn WC, \u0111\u1ed9 b\u00e1m d\u00ednh m\u1ea1nh s\u1ebd \u0111\u01b0\u1ee3c t\u1ea1o ra. Ngo\u00e0i ra, \u0111\u1ed9 b\u1ec1n g\u00e3y t\u1ed1t h\u01a1n c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch l\u00e0m l\u1ec7ch v\u1ebft n\u1ee9t ho\u1eb7c b\u1eafc c\u1ea7u c\u1ee7a c\u00e1c h\u1ea1t CBN. Hai tr\u1edf ng\u1ea1i ch\u00ednh trong qu\u00e1 tr\u00ecnh b\u1ed5 sung CBN l\u00e0 chuy\u1ec3n \u0111\u1ed5i t\u1eeb CBN sang hBN v\u00e0 li\u00ean k\u1ebft c\u1ed9ng h\u00f3a tr\u1ecb m\u1ea1nh gi\u1eefa B v\u00e0 N, d\u1eabn \u0111\u1ebfn kh\u1ea3 n\u0103ng thi\u00eau k\u1ebft th\u1ea5p c\u1ee7a CBN v\u00e0 cacbua xi m\u0103ng.<\/p>

Kim c\u01b0\u01a1ng WC<\/strong><\/strong><\/h3>

WC kim c\u01b0\u01a1ng c\u00f3 \u0111\u1ed9 b\u1ec1n g\u00e3y tuy\u1ec7t v\u1eddi, ch\u1ed1ng n\u1ee9t t\u0103ng tr\u01b0\u1edfng v\u00e0 ch\u1ed1ng ph\u1ea3n x\u1ea1. V\u1eadt li\u1ec7u n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9ng \u0111\u1ec3 ng\u0103n kim c\u01b0\u01a1ng bi\u1ebfn th\u00e0nh than ch\u00ec. Th\u00f4ng qua nhi\u1ec1u nghi\u00ean c\u1ee9u \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u n\u00e0y, ch\u00fang t\u00f4i c\u00f3 th\u1ec3 t\u1ea1o ra kho\u1ea3ng c\u00e1ch chi ph\u00ed r\u1ea5t l\u1edbn, r\u1ea5t c\u1ea7n thi\u1ebft.<\/p><\/div>","protected":false},"excerpt":{"rendered":"

Cemented carbide is a kind of cemented carbide which is made by powder metallurgy process from the hard compound of refractory metal and bonding metal. Because of its good hardness and strength, it is widely used in many fields. With the requirement of high temperature performance and corrosion resistance of cemented carbide materials getting higher…<\/p>","protected":false},"author":2,"featured_media":13997,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79,1],"tags":[],"class_list":["post-13993","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-weekly","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2020\/04\/\u56fe\u72472-7.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/13993","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=13993"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/13993\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media\/13997"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=13993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=13993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=13993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}