{"id":13917,"date":"2020-03-12T08:55:52","date_gmt":"2020-03-12T08:55:52","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=13917"},"modified":"2020-05-07T00:30:57","modified_gmt":"2020-05-07T00:30:57","slug":"the-efficacy-of-carbon-content-on-wc-tic-co-cemented-carbide","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/tinh-hieu-qua-cua-ham-luong-cacbon-tren-wc-tic-co-xi-mang-cacbua\/","title":{"rendered":"Hi\u1ec7u qu\u1ea3 c\u1ee7a th\u00e0nh ph\u1ea7n carbon tr\u00ean cacbua WC-tic-\u0111\u1ed3ng"},"content":{"rendered":"
\n

C\u00e1c cacbua xi m\u0103ng WC Co r\u1ea5t d\u1ec5 b\u1ecb oxy h\u00f3a v\u00e0 ph\u00e2n h\u1ee7y trong \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao, c\u00f3 nhi\u1ec1u v\u1ea5n \u0111\u1ec1 nh\u01b0 gi\u00f2n, d\u1ec5 g\u00e3y, qu\u00e1 tr\u00ecnh l\u00e0m m\u1ec1m v\u00e0 \u0111\u1ee9t c\u1ea1nh, vv ch\u00fang v\u1eabn kh\u00f4ng th\u00edch h\u1ee3p cho vi\u1ec7c c\u1eaft th\u00e9p t\u1ed1c \u0111\u1ed9 cao, v\u00ec v\u1eady ch\u00fang c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf l\u1edbn. WC tic co cacbua xi m\u0103ng \u0111\u01b0\u1ee3c bi\u1ebft l\u00e0 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n, ch\u1ed1ng oxy h\u00f3a v\u00e0 ch\u1ed1ng m\u00e0i m\u00f2n mi\u1ec7ng n\u00fai l\u1eeda.<\/strong><\/strong><\/p>\n\n\n\n

Tuy nhi\u00ean, do tic v\u00e0 dung d\u1ecbch r\u1eafn c\u1ee7a n\u00f3 gi\u00f2n h\u01a1n nhi\u1ec1u so v\u1edbi WC n\u00ean h\u1ee3p kim n\u00e0y c\u0169ng c\u00f3 khuy\u1ebft t\u1eadt t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn, \u0111\u00f3 l\u00e0 \u0111\u1ed9 d\u1ebbo dai v\u00e0 t\u00ednh h\u00e0n c\u1ee7a h\u1ee3p kim k\u00e9m. H\u01a1n n\u1eefa, khi h\u00e0m l\u01b0\u1ee3ng TiC v\u01b0\u1ee3t qu\u00e1 18%, h\u1ee3p kim kh\u00f4ng ch\u1ec9 gi\u00f2n m\u00e0 c\u00f2n kh\u00f3 h\u00e0n. Ngo\u00e0i ra, tic kh\u00f4ng th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ed9 cao. <\/strong><\/strong><\/p>\n\n\n\n

TAC kh\u00f4ng ch\u1ec9 c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a c\u1ee7a cacbua xi m\u0103ng, m\u00e0 c\u00f2n \u1ee9c ch\u1ebf s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ea1t WC v\u00e0 tic. N\u00f3 l\u00e0 m\u1ed9t lo\u1ea1i cacbua th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 b\u1ec1n c\u1ee7a cacbua xi m\u0103ng m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a cacbua xi m\u0103ng. TAC c\u00f3 th\u1ec3 l\u00e0m t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a cacbua xi m\u0103ng b\u1eb1ng c\u00e1ch th\u00eam TAC v\u00e0o WC tic co cacbua xi m\u0103ng Vi\u1ec7c b\u1ed5 sung TAC gi\u00fap gi\u1ea3m h\u1ec7 s\u1ed1 ma s\u00e1t, do \u0111\u00f3 l\u00e0m gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 c\u1ee7a d\u1ee5ng c\u1ee5. H\u1ee3p kim c\u00f3 th\u1ec3 ch\u1ecbu t\u1ea3i tr\u1ecdng va \u0111\u1eadp l\u1edbn \u1edf nhi\u1ec7t \u0111\u1ed9 c\u1eaft. \u0110i\u1ec3m n\u00f3ng ch\u1ea3y c\u1ee7a TAC cao t\u1edbi 3880 \u2103. Vi\u1ec7c b\u1ed5 sung TAC r\u1ea5t c\u00f3 l\u1ee3i \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ed9 cao c\u1ee7a h\u1ee3p kim. Ngay c\u1ea3 \u1edf 1000 \u2103, n\u00f3 v\u1eabn c\u00f3 th\u1ec3 duy tr\u00ec \u0111\u1ed9 c\u1ee9ng v\u00e0 s\u1ee9c m\u1ea1nh t\u1ed1t.<\/strong><\/strong><\/p>\n\n\n\n

Tic v\u00e0 TAC kh\u00f4ng h\u00f2a tan trong WC, trong khi WC h\u00f2a tan trong tic. \u0110\u1ed9 h\u00f2a tan c\u1ee7a WC trong dung d\u1ecbch r\u1eafn li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh b\u1edfi TAC l\u00e0 kho\u1ea3ng 70wt%. \u0110\u1ed9 tan c\u1ee7a WC trong dung d\u1ecbch r\u1eafn gi\u1ea3m khi h\u00e0m l\u01b0\u1ee3ng TAC t\u0103ng. C\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a h\u1ee3p kim WC tic tac Co ch\u1ee7 y\u1ebfu \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh tic + TAC, t\u1ef7 l\u1ec7 s\u1ed1 nguy\u00ean t\u1eed Ti tr\u00ean s\u1ed1 nguy\u00ean t\u1eed ta v\u00e0 h\u00e0m l\u01b0\u1ee3ng coban. Khi t\u1ef7 l\u1ec7 gi\u1eefa s\u1ed1 nguy\u00ean t\u1eed Ti v\u1edbi s\u1ed1 nguy\u00ean t\u1eed ta v\u00e0 h\u00e0m l\u01b0\u1ee3ng coban \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh, vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh h\u00e0m l\u01b0\u1ee3ng TiC + TAC \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t t\u1ed1t nh\u1ea5t \u0111\u00e3 tr\u1edf th\u00e0nh tr\u1ecdng t\u00e2m c\u1ee7a nghi\u00ean c\u1ee9u.<\/strong><\/strong><\/p>\n\n\n\n

1. Nguy\u00ean li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u00ed nghi\u1ec7m n\u00e0y l\u00e0: b\u1ed9t WC, b\u1ed9t cacbua h\u1ee3p ch\u1ea5t [(W, Ti, TA) C] v\u00e0 b\u1ed9t Co. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong B\u1ea3ng 1.<\/strong><\/strong><\/p>\n\n\n\n

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B\u1ea3ng 1 Th\u00e0nh ph\u1ea7n v\u00e0 c\u1ee1 h\u1ea1t trung b\u00ecnh c\u1ee7a nguy\u00ean li\u1ec7u th\u00f4<\/strong><\/strong><\/p>\n\n\n\n

Sau khi b\u1ed9t \u0111\u01b0\u1ee3c c\u00e2n \u0111\u1ed1i theo b\u1ea3ng ti\u00eau chu\u1ea9n 2, \u0111\u01b0\u1ee3c nghi\u1ec1n v\u00e0 tr\u1ed9n tr\u00ean m\u00e1y nghi\u1ec1n bi h\u00e0nh tinh nd7-2l trong 34h, t\u1ef7 l\u1ec7 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a nguy\u00ean li\u1ec7u bi l\u00e0 5: 1, m\u00f4i tr\u01b0\u1eddng nghi\u1ec1n l\u00e0 c\u1ed3n, l\u01b0\u1ee3ng th\u00eam v\u00e0o l\u00e0 450ml. \/ kg, t\u1ed1c \u0111\u1ed9 xay l\u00e0 228r \/ ph\u00fat v\u00e0 parafin 2wt% \u0111\u01b0\u1ee3c th\u00eam v\u00e0o b\u1ed1n gi\u1edd tr\u01b0\u1edbc khi k\u1ebft th\u00fac qu\u00e1 tr\u00ecnh xay. B\u00f9n ph\u1ea3i \u0111\u01b0\u1ee3c s\u00e0ng l\u1ecdc (325 l\u01b0\u1edbi), s\u1ea5y kh\u00f4 ch\u00e2n kh\u00f4ng, s\u00e0ng l\u1ecdc (150 l\u01b0\u1edbi) v\u00e0 \u00e9p \u0111\u1ecbnh h\u00ecnh sau khi s\u1ea5y, \u00e1p su\u1ea5t \u00e9p ph\u1ea3i l\u00e0 250Mpa v\u00e0 k\u00edch th\u01b0\u1edbc tr\u1ed1ng l\u00e0 (25 \u00d7 8 \u00d7 6,5) mm. C\u00e1c m\u1eabu \u00e9p \u0111\u01b0\u1ee3c thi\u00eau k\u1ebft trong l\u00f2 thi\u00eau k\u1ebft ch\u00e2n kh\u00f4ng vsf-223 \u1edf 1420 \u2103 trong 1H.<\/strong><\/strong><\/p>\n\n\n\n

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B\u1ea3ng 2 t\u1ef7 l\u1ec7 th\u00e0nh ph\u1ea7n c\u1ee7a h\u1ee3p kim%<\/strong><\/strong><\/p>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p u\u1ed1n ba \u0111i\u1ec3m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 b\u1ec1n u\u1ed1n c\u1ee7a m\u1eabu thi\u00eau k\u1ebft tr\u00ean m\u00e1y \u0111o \u0111\u1ed9 b\u1ec1n n\u00e9n k\u1ef9 thu\u1eadt s\u1ed1 sgy-50000. D\u1eef li\u1ec7u \u0111\u1ed9 b\u1ec1n cu\u1ed1i c\u00f9ng l\u00e0 gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ee7a ba m\u1eabu. \u0110\u1ed9 c\u1ee9ng HRA c\u1ee7a m\u1eabu \u0111\u01b0\u1ee3c \u0111o tr\u00ean m\u00e1y \u0111o \u0111\u1ed9 c\u1ee9ng Rockwell. Ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng ph\u1ea7n l\u00f5m h\u00ecnh n\u00f3n b\u1eb1ng kim c\u01b0\u01a1ng v\u1edbi t\u1ea3i tr\u1ecdng 600N v\u00e0 g\u00f3c h\u00ecnh n\u00f3n l\u00e0 120 \u00b0.<\/strong><\/strong><\/p>\n\n\n\n

T\u1eeb t\u00ednh coban \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng m\u00e1y th\u1eed t\u1eeb t\u00ednh coban, v\u00e0 l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng m\u00e1y \u0111o l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf. Sau khi b\u1ec1 m\u1eb7t c\u1ee7a m\u1eabu \u0111\u01b0\u1ee3c ti\u1ebfp \u0111\u1ea5t th\u00e0nh m\u1eb7t g\u01b0\u01a1ng, m\u1eb7t g\u01b0\u01a1ng b\u1ecb \u0103n m\u00f2n b\u1edfi h\u1ed7n h\u1ee3p th\u1ec3 t\u00edch b\u1eb1ng nhau c\u1ee7a dung d\u1ecbch natri hi\u0111roxit 20% v\u00e0 dung d\u1ecbch kali xyanua 20%, sau \u0111\u00f3 quan s\u00e1t luy\u1ec7n kim tr\u00ean k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t \u0111\u01b0\u1ee3c 4000 l\u1ea7n. T\u00ednh ch\u1ea5t t\u1eeb T\u00ednh ch\u1ea5t t\u1eeb bao g\u1ed3m \u0111\u1ed3ng t\u1eeb com v\u00e0 l\u1ef1c c\u01b0\u1ee1ng b\u1ee9c HC. Com th\u1ec3 hi\u1ec7n h\u00e0m l\u01b0\u1ee3ng cacbon trong h\u1ee3p kim, HC th\u1ec3 hi\u1ec7n k\u00edch th\u01b0\u1edbc h\u1ea1t WC. Theo ti\u00eau chu\u1ea9n qu\u1ed1c gia gb3848-1983, t\u1eeb t\u00ednh coban v\u00e0 l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf c\u1ee7a h\u1ee3p kim \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, v\u00e0 k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong b\u1ea3ng 3. T\u1eeb b\u1ea3ng 3 c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng \u0111\u1ed9 b\u00e3o h\u00f2a t\u1eeb t\u01b0\u01a1ng \u0111\u1ed1i COM \/ CO v\u00e0 l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf HC gi\u1ea3m. v\u1edbi s\u1ef1 t\u0103ng l\u00ean c\u1ee7a h\u00e0m l\u01b0\u1ee3ng cacbua h\u1ee3p ch\u1ea5t (W, Ti, TA) C.<\/strong><\/p>\n\n\n\n

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B\u1ea3ng 3 k\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m t\u1eeb t\u00ednh coban v\u00e0 l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf c\u1ee7a vonfram coban titanat<\/strong><\/strong><\/p>\n\n\n\n

N\u00f3i chung, vi\u1ec7c ki\u1ec3m so\u00e1t h\u00e0m l\u01b0\u1ee3ng COM tr\u00ean 85% c\u1ee7a coban \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ee3p kim kh\u00f4ng b\u1ecb kh\u1eed cacbon, t\u1ef7 l\u1ec7 COM \/ CO trong nh\u00f3m 1 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi 85% v\u00e0 HC c\u1ee7a n\u00f3 c\u0169ng cao b\u1ea5t th\u01b0\u1eddng. Pha \u03b7 kh\u00f4ng t\u1eeb t\u00ednh (co3w3c) xu\u1ea5t hi\u1ec7n trong h\u1ee3p kim, thu\u1ed9c c\u1ea5u tr\u00fac kh\u1eed m\u00f9i nghi\u00eam tr\u1ecdng. Do \u0111\u00f3, ch\u00fang ta s\u1ebd ch\u1ec9 th\u1ea3o lu\u1eadn nh\u00f3m 2, 3 v\u00e0 4:<\/strong><\/strong><\/p>\n\n\n\n

Trong th\u00ed nghi\u1ec7m n\u00e0y, t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a nh\u00f3m h\u1ee3p kim 2, 3 v\u00e0 4 l\u1ea7n l\u01b0\u1ee3t l\u00e0 7,18wt%, 7,61wt%, 8,04wt%, t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon l\u1ea7n l\u01b0\u1ee3t t\u0103ng v\u00e0 HC gi\u1ea3m l\u1ea7n l\u01b0\u1ee3t. K\u00edch th\u01b0\u1edbc c\u1ee7a l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf li\u00ean quan \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 ph\u00e2n t\u00e1n c\u1ee7a pha coban v\u00e0 h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a h\u1ee3p kim. M\u1ee9c \u0111\u1ed9 ph\u00e2n t\u00e1n c\u1ee7a pha coban c\u00e0ng cao th\u00ec l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf c\u1ee7a h\u1ee3p kim c\u00e0ng l\u1edbn. M\u1ee9c \u0111\u1ed9 ph\u00e2n t\u00e1n c\u1ee7a pha coban ph\u1ee5 thu\u1ed9c v\u00e0o h\u00e0m l\u01b0\u1ee3ng coban v\u00e0 c\u1ee1 h\u1ea1t WC c\u1ee7a h\u1ee3p kim. Khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c h\u00e0m l\u01b0\u1ee3ng coban, h\u1ea1t WC c\u00e0ng m\u1ecbn th\u00ec l\u1ef1c c\u01b0\u1ee1ng ch\u1ebf c\u00e0ng cao. Do \u0111\u00f3, HC c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t ch\u1ec9 s\u1ed1 \u0111\u1ec3 \u0111o gi\u00e1n ti\u1ebfp k\u00edch th\u01b0\u1edbc h\u1ea1t WC<\/strong><\/strong><\/p>\n\n\n\n

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H\u00e0m l\u01b0\u1ee3ng cacbon \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn dung d\u1ecbch r\u1eafn c\u1ee7a vonfram trong coban. V\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a h\u00e0m l\u01b0\u1ee3ng cacbon, h\u00e0m l\u01b0\u1ee3ng vonfram trong pha coban gi\u1ea3m. Dung d\u1ecbch r\u1eafn c\u1ee7a vonfram trong coban l\u00e0 4wt% trong h\u1ee3p kim gi\u00e0u cacbon v\u00e0 16wt% trong h\u1ee3p kim thi\u1ebfu cacbon. V\u00ec w c\u00f3 th\u1ec3 \u1ee9c ch\u1ebf s\u1ef1 h\u00f2a tan v\u00e0 k\u1ebft t\u1ee7a c\u1ee7a WC trong pha \u03b3, WC \u0111\u01b0\u1ee3c tinh ch\u1ebf v\u00e0 HC cao, do \u0111\u00f3 t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon l\u1ea7n l\u01b0\u1ee3t t\u0103ng l\u00ean, WC h\u1ea1t th\u00f4 v\u00e0 HC gi\u1ea3m. 2.2 K\u1ebft qu\u1ea3 ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n u\u1ed1n v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u1ea5u tr\u00fac vi m\u00f4 \u0111\u1ebfn c\u01a1 t\u00ednh c\u1ee7a h\u1ee3p kim \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong H\u00ecnh 1. \u0110\u1ed9 b\u1ec1n u\u1ed1n t\u0103ng khi h\u00e0m l\u01b0\u1ee3ng C c\u1ee7a h\u1ee3p ch\u1ea5t cacbua t\u0103ng l\u00ean (W, Ti, TA ), trong khi \u0111\u1ed9 c\u1ee9ng th\u00ec ng\u01b0\u1ee3c l\u1ea1i.<\/strong><\/p>\n\n\n\n

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H\u00ecnh 1: K\u1ebft qu\u1ea3 ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n u\u1ed1n c\u1ee7a vonfram coban titanat<\/strong><\/strong><\/p>\n\n\n\n

V\u1edbi s\u1ef1 gi\u1ea3m h\u00e0m l\u01b0\u1ee3ng C trong c\u00e1c cacbua h\u1ee3p ch\u1ea5t (W, Ti, TA), HC t\u0103ng l\u00ean, t\u1ee9c l\u00e0 s\u1ef1 tinh ch\u1ebf h\u1ea1t WC. \u0110\u1ed9 c\u1ee9ng t\u0103ng l\u00ean khi tinh ch\u1ebf h\u1ea1t WC khi h\u00e0m l\u01b0\u1ee3ng coban kh\u00f4ng \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y l\u00e0 do h\u1ee3p kim \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng th\u00f4ng qua ranh gi\u1edbi h\u1ea1t v\u00e0 ranh gi\u1edbi pha, v\u00e0 vi\u1ec7c tinh ch\u1ebf h\u1ea1t cacbua s\u1ebd l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng h\u00f2a tan c\u1ee7a n\u00f3 trong pha li\u00ean k\u1ebft, v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a pha \u03b3 c\u0169ng s\u1ebd t\u0103ng l\u00ean, d\u1eabn \u0111\u1ebfn t\u0103ng \u0111\u1ed9 c\u1ee9ng c\u1ee7a to\u00e0n b\u1ed9 h\u1ee3p kim.<\/strong><\/strong><\/p>\n\n\n\n

Tuy nhi\u00ean, \u1ea3nh h\u01b0\u1edfng c\u1ee7a k\u00edch th\u01b0\u1edbc h\u1ea1t WC \u0111\u1ebfn \u0111\u1ed9 dai \u0111\u1ee9t g\u00e3y ph\u1ee9c t\u1ea1p h\u01a1n. \u0110\u1ed1i v\u1edbi h\u1ee3p kim c\u00f3 k\u00edch th\u01b0\u1edbc h\u1ea1t nh\u1ecf h\u01a1n micromet, c\u00e1c v\u1ebft n\u1ee9t l\u00f5m ch\u00ednh l\u00e0 v\u1ebft n\u1ee9t (gi\u1eefa c\u00e1c h\u1ea1t) v\u00e0 l\u00e0m c\u1ea7u n\u1ed1i \u0111\u1ed9 b\u1ec1n, v\u1edbi m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf \u0111\u1ee9t g\u00e3y xuy\u00ean h\u1ea1t.<\/strong><\/strong><\/p>\n\n\n\n

Khi k\u00edch th\u01b0\u1edbc h\u1ea1t WC tr\u1edf n\u00ean m\u1ecbn h\u01a1n, x\u00e1c su\u1ea5t khuy\u1ebft t\u1eadt trong h\u1ea1t gi\u1ea3m, v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a h\u1ea1t t\u0103ng l\u00ean, d\u1eabn \u0111\u1ebfn gi\u1ea3m \u0111\u1ee9t g\u00e3y xuy\u00ean h\u1ea1t v\u00e0 t\u0103ng \u0111\u1ee9t g\u00e3y gi\u1eefa c\u00e1c h\u1ea1t. \u0110\u1ed1i v\u1edbi h\u1ee3p kim c\u00f3 k\u00edch th\u01b0\u1edbc h\u1ea1t l\u1edbn, ch\u1ec9 c\u00f3 b\u1ed1n h\u1ec7 th\u1ed1ng tr\u01b0\u1ee3t \u0111\u1ed9c l\u1eadp trong tinh th\u1ec3 WC. V\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a k\u00edch th\u01b0\u1edbc h\u1ea1t WC, \u0111\u1ed9 v\u00f5ng v\u00e0 \u0111\u1ed9 ph\u00e2n nh\u00e1nh c\u1ee7a v\u1ebft n\u1ee9t t\u0103ng l\u00ean, d\u1eabn \u0111\u1ebfn t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t \u0111\u1ee9t g\u00e3y v\u00e0 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 d\u1ebbo dai. Do \u0111\u00f3, vi\u1ec7c \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 b\u1ec1n u\u1ed1n ch\u1ec9 theo k\u00edch th\u01b0\u1edbc h\u1ea1t l\u00e0 kh\u00f4ng ch\u00ednh x\u00e1c, v\u00e0 c\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a n\u00f3 c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch.<\/strong><\/strong><\/p>\n\n\n\n

C\u1ea5u tr\u00fac luy\u1ec7n kim c\u1ee7a cacbua xi m\u0103ng v\u1edbi b\u1ed1n h\u00e0m l\u01b0\u1ee3ng cacbua h\u1ee3p ch\u1ea5t kh\u00e1c nhau (W, Ti, TA) C \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong H\u00ecnh 2. V\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a h\u00e0m l\u01b0\u1ee3ng (W, Ti, TA) C, h\u00ecnh d\u1ea1ng c\u1ee7a WC c\u00f3 xu h\u01b0\u1edbng \u0111\u1ec1u \u0111\u1eb7n. H\u1ea7u h\u1ebft WC trong H\u00ecnh 2a l\u00e0 c\u00e1c thanh d\u00e0i kh\u00f4ng \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp k\u00edn k\u1ebd. C\u1ee1 h\u1ea1t trung b\u00ecnh c\u1ee7a WC t\u01b0\u01a1ng \u0111\u1ed1i m\u1ecbn nh\u01b0ng \u0111\u1ed9 li\u1ec1n k\u1ec1 cao, nguy\u00ean nh\u00e2n l\u00e0 do WC k\u1ebft tinh kh\u00f4ng \u0111\u1ee7, pha coban kh\u00f4ng b\u1ecdc h\u1ebft WC v\u00e0 \u0111\u1ed9 d\u00e0y kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u. V\u00e0 c\u00f3 nh\u1eefng h\u1ea1t WC th\u00f4 h\u00ecnh tam gi\u00e1c. Khi pha \u03b7 b\u1ecb ph\u00e2n h\u1ee7y, CO \u0111\u01b0\u1ee3c k\u1ebft t\u1ee7a, d\u1eabn \u0111\u1ebfn l\u00e0m gi\u00e0u \u0111\u1ed3ng c\u1ee5c b\u1ed9. \u0110\u1ed3ng th\u1eddi, W v\u00e0 C k\u1ebft t\u1ee7a tr\u00ean c\u00e1c h\u1ea1t WC xung quanh t\u1ea1o th\u00e0nh c\u00e1c h\u1ea1t WC th\u00f4 h\u00ecnh tam gi\u00e1c. T\u1eeb h\u00ecnh 2a-2d c\u00f3 th\u1ec3 th\u1ea5y h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc v\u00e0 s\u1ef1 ph\u00e2n b\u1ed1 c\u1ee7a c\u00e1c h\u1ea1t WC c\u00f3 nh\u1eefng thay \u0111\u1ed5i r\u00f5 r\u1ec7t. H\u1ea1t WC c\u00f3 xu h\u01b0\u1edbng h\u00ecnh d\u1ea1ng t\u1ea5m \u0111\u1ec1u \u0111\u1eb7n, c\u00e1c c\u1ea1nh th\u00f4 c\u1ee7a h\u1ea1t gi\u1ea3m v\u00e0 \u0111\u01b0\u1eddng \u0111i t\u1ef1 do trung b\u00ecnh \u03bb c\u1ee7a pha li\u00ean k\u1ebft t\u0103ng l\u00ean. Trong H\u00ecnh 2D, h\u1ea1t WC ph\u00e1t tri\u1ec3n t\u1ed1t, v\u1edbi s\u1ef1 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t h\u1eb9p, m\u1ee9c \u0111\u1ed9 g\u1ea7n nhau c\u1ee7a h\u1ea1t th\u00f4 th\u1ea5p, \u0111\u01b0\u1eddng \u0111i t\u1ef1 do trung b\u00ecnh l\u1edbn \u03bb c\u1ee7a pha li\u00ean k\u1ebft, h\u1ea7u h\u1ebft trong s\u1ed1 \u0111\u00f3 l\u00e0 kho\u1ea3ng 1,0 \u03bcm WC t\u1ea5m, v\u00e0 m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf WC tam gi\u00e1c. kho\u1ea3ng 200nm, t\u1ea5t c\u1ea3 \u0111\u1ec1u l\u00e0 ph\u00e2n b\u1ed1 t\u00e1n s\u1eafc.<\/strong><\/p>\n\n\n\n

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H\u00ecnh 2 h\u00ecnh \u1ea3nh kim lo\u1ea1i v\u1ec1 h\u00e0m l\u01b0\u1ee3ng C c\u1ee7a c\u00e1c cacbua h\u1ee3p ch\u1ea5t kh\u00e1c nhau (W, Ti, TA) trong cacbit xi m\u0103ng<\/strong><\/strong><\/p>\n\n\n\n

S\u1ef1 k\u1ebft t\u1ee7a h\u00f2a tan c\u1ee7a WC x\u1ea3y ra trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, \u0111i\u1ec1u n\u00e0y l\u00e0m cho WC c\u00f3 n\u0103ng l\u01b0\u1ee3ng cao h\u01a1n (c\u00e1c h\u1ea1t nh\u1ecf, c\u00e1c c\u1ea1nh v\u00e0 g\u00f3c c\u1ee7a b\u1ec1 m\u1eb7t h\u1ea1t, ch\u1ed7 ph\u1ed3ng v\u00e0 \u0111i\u1ec3m ti\u1ebfp x\u00fac) h\u00f2a tan \u01b0u ti\u00ean, v\u00e0 l\u00e0m cho WC h\u00f2a tan trong pha l\u1ecfng l\u1eafng \u0111\u1ecdng tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a WC l\u1edbn sau khi k\u1ebft t\u1ee7a, l\u00e0m cho WC nh\u1ecf bi\u1ebfn m\u1ea5t v\u00e0 WC l\u1edbn t\u0103ng l\u00ean, \u0111\u1ed3ng th\u1eddi l\u00e0m cho c\u00e1c h\u1ea1t t\u00edch t\u1ee5 ch\u1eb7t ch\u1ebd h\u01a1n t\u00f9y theo s\u1ef1 th\u00edch \u1ee9ng h\u00ecnh d\u1ea1ng, l\u00e0m cho b\u1ec1 m\u1eb7t h\u1ea1t c\u00f3 xu h\u01b0\u1edbng nh\u1eb5n, v\u00e0 l\u00e0m cho hai WCS kho\u1ea3ng c\u00e1ch gi\u1eefa ch\u00fang \u0111\u01b0\u1ee3c r\u00fat ng\u1eafn l\u1ea1i .<\/strong><\/strong><\/p>\n\n\n\n

Trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft h\u1ee3p kim coban th\u1ea5p, v\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon, l\u01b0\u1ee3ng pha l\u1ecfng v\u00e0 th\u1eddi gian l\u01b0u c\u1ee7a pha l\u1ecfng t\u0103ng, qu\u00e1 tr\u00ecnh k\u1ebft t\u1ee7a h\u00f2a tan WC \u0111\u1ea7y \u0111\u1ee7 h\u01a1n, h\u1ea1t WC ph\u00e1t tri\u1ec3n ho\u00e0n to\u00e0n, b\u1ec1 m\u1eb7t nh\u1eb5n h\u01a1n, v\u00e0 s\u1ef1 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u1ed3ng \u0111\u1ec1u h\u01a1n. Ngo\u00e0i ra, v\u1edbi s\u1ef1 t\u0103ng l\u00ean c\u1ee7a t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a h\u1ee3p kim, dung d\u1ecbch r\u1eafn c\u1ee7a W trong CO gi\u1ea3m, v\u00e0 vi\u1ec7c gi\u1ea3m h\u00e0m l\u01b0\u1ee3ng W trong pha li\u00ean k\u1ebft s\u1ebd c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo c\u1ee7a pha li\u00ean k\u1ebft, do \u0111\u00f3 l\u00e0m t\u0103ng \u0111\u1ed9 b\u1ec1n u\u1ed1n c\u1ee7a cacbua xi m\u0103ng. Do \u0111\u00f3, \u0111\u1ed9 b\u1ec1n u\u1ed1n t\u0103ng l\u00ean c\u00f9ng v\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon.<\/strong><\/strong><\/p>\n\n\n\n

ph\u1ea7n k\u1ebft lu\u1eadn<\/strong><\/strong><\/p>\n\n\n\n

(1) Khi h\u00e0m l\u01b0\u1ee3ng CO kh\u00f4ng \u0111\u1ed5i, v\u1edbi s\u1ef1 t\u0103ng c\u1ee7a h\u00e0m l\u01b0\u1ee3ng cacbua h\u1ee3p ch\u1ea5t (W, Ti, TA) C, t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a h\u1ee3p kim t\u0103ng l\u00ean, HC gi\u1ea3m, h\u1ea1t WC th\u00f4, w dung d\u1ecbch CO gi\u1ea3m, v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a h\u1ee3p kim gi\u1ea3m d\u1ea7n.<\/strong><\/strong><\/p>\n\n\n\n

(2) C\u1ea5u tr\u00fac kim lo\u1ea1i c\u1ee7a h\u1ee3p kim li\u00ean quan ch\u1eb7t ch\u1ebd \u0111\u1ebfn t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a h\u1ee3p kim. H\u00e0m l\u01b0\u1ee3ng cacbua h\u1ee3p ch\u1ea5t (W, Ti, TA) C t\u0103ng l\u00ean, t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u1ee7a h\u1ee3p kim t\u0103ng l\u00ean, \u0111\u1ed9 li\u1ec1n k\u1ec1 c\u1ee7a h\u1ea1t WC gi\u1ea3m, s\u1ef1 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t thu h\u1eb9p, \u0111\u01b0\u1eddng \u0111i t\u1ef1 do trung b\u00ecnh \u03bb c\u1ee7a pha li\u00ean k\u1ebft t\u0103ng v\u00e0 \u0111\u1ed9 b\u1ec1n u\u1ed1n t\u0103ng.<\/strong><\/strong><\/p>\n\n\n\n

(3) C\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 \u0111\u1eb7c t\u00ednh t\u1ed1t nh\u1ea5t c\u1ee7a wcta nh\u01b0 sau: khi t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng cacbon l\u00e0 8,04wt%, \u0111\u1ed9 c\u1ee9ng l\u00e0 91,9hra v\u00e0 \u0111\u1ed9 b\u1ec1n u\u1ed1n l\u00e0 1108mpa.<\/strong><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

WC Co cemented carbides are easy to oxidize and decompose in high temperature application, which have many problems, such as brittleness, brittle fracture, processing softening and edge breaking, etc. they are still not suitable for high speed cutting of steel, so they have great limitations. WC tic co cemented carbides are known to have wear…<\/p>","protected":false},"author":2,"featured_media":13928,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2020\/03\/\u56fe\u72478-1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/13917"}],"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=13917"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/13917\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media\/13928"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=13917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=13917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=13917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}