{"id":21756,"date":"2023-03-18T14:30:18","date_gmt":"2023-03-18T06:30:18","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=21756"},"modified":"2023-03-18T14:31:22","modified_gmt":"2023-03-18T06:31:22","slug":"wet-milling","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/wet-milling\/","title":{"rendered":"\u1ea2nh h\u01b0\u1edfng c\u1ee7a th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt \u0111\u1ebfn c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a cacbua xi m\u0103ng YG8\uff08ISO K30)"},"content":{"rendered":"
Nghi\u1ec1n \u01b0\u1edbt c\u00f3 th\u1ec3 nghi\u1ec1n c\u00e1c pha c\u1ee9ng (ch\u1ee7 y\u1ebfu l\u00e0 pha WC) \u0111\u1ebfn k\u00edch th\u01b0\u1edbc h\u1ea1t y\u00eau c\u1ea7u v\u00e0 \u0111\u1ea1t tr\u1ea1ng th\u00e1i tr\u1ed9n \u0111\u1ec1u v\u1edbi b\u1ed9t Co trong ph\u1ea1m vi nh\u1ecf, c\u00f3 \u0111\u1eb7c t\u00ednh n\u00e9n v\u00e0 thi\u00eau k\u1ebft t\u1ed1t. V\u00ec v\u1eady, th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng th\u00f4ng s\u1ed1 quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh ch\u1ebf t\u1ea1o h\u1ee3p kim c\u1ee9ng. B\u00e0i vi\u1ebft n\u00e0y ch\u1ee7 y\u1ebfu nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt \u0111\u1ebfn vi c\u1ea5u tr\u00fac v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a h\u1ee3p kim c\u1ee9ng.<\/p>\n

V\u1eadt li\u1ec7u th\u00ed nghi\u1ec7m nghi\u1ec1n \u01b0\u1edbt v\u00e0 ph\u01b0\u01a1ng ph\u00e1p<\/h1>\n

B\u1ed9t composite WC-Co t\u00e1i ch\u1ebf \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p n\u1ea5u ch\u1ea3y k\u1ebdm \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u th\u00ed nghi\u1ec7m v\u00e0 th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong B\u1ea3ng 1.<\/p>\n

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Ph\u00e2n t\u00edch k\u00edch th\u01b0\u1edbc h\u1ea1t laser cho th\u1ea5y \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh l\u00e0 3,46\u03bcm, v\u1edbi ph\u1ea1m vi ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t h\u1eb9p v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t t\u01b0\u01a1ng \u0111\u1ed1i t\u1eadp trung. H\u00ecnh 1 th\u1ec3 hi\u1ec7n \u1ea3nh SEM v\u1ec1 h\u00ecnh th\u00e1i ban \u0111\u1ea7u c\u1ee7a b\u1ed9t composite WC-Co.<\/p>\n

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T\u1eeb H\u00ecnh 1, c\u00f3 th\u1ec3 th\u1ea5y r\u00f5 r\u1eb1ng b\u1ed9t t\u00e1i ch\u1ebf c\u00f3 \u0111\u1ed9 k\u1ebft t\u1ee5 nh\u1eb9 v\u00e0 h\u00ecnh th\u00e1i c\u1ee7a n\u00f3 ch\u1ee7 y\u1ebfu l\u00e0 h\u00ecnh tam gi\u00e1c ho\u1eb7c h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi c\u00e1c c\u1ea1nh nh\u1eb5n, v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1eb7c t\u00ednh c\u1ee7a h\u1ea1t WC trong h\u1ee3p kim c\u1ee9ng. K\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh c\u1ee7a b\u1ed9t l\u00e0 kho\u1ea3ng 3\u03bcm, ph\u00f9 h\u1ee3p v\u1edbi k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c t\u1eeb ph\u00e2n t\u00edch k\u00edch th\u01b0\u1edbc h\u1ea1t b\u1eb1ng laser.<\/p>\n

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H\u00ecnh 2 cho th\u1ea5y ph\u1ed5 XRD c\u1ee7a b\u1ed9t composite WC-Co.<\/p>\n

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K\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m v\u00e0 th\u1ea3o lu\u1eadn v\u1ec1 th\u1eddi gian xay \u01b0\u1edbt<\/h1>\n

H\u00ecnh 3 th\u1ec3 hi\u1ec7n h\u00ecnh th\u00e1i c\u1ee7a b\u1ed9t composite WC-Co sau c\u00e1c l\u1ea7n nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau. Nh\u01b0 th\u1ec3 hi\u1ec7n tr\u00ean H\u00ecnh 3(a), khi nghi\u1ec1n \u01b0\u1edbt trong 18 gi\u1edd, k\u00edch th\u01b0\u1edbc b\u1ed9t t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn v\u00e0 ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ec1u, cho th\u1ea5y hi\u1ec7u qu\u1ea3 nghi\u1ec1n \u01b0\u1edbt l\u00e0 kh\u00f4ng l\u00fd t\u01b0\u1edfng v\u00e0 s\u1ef1 va ch\u1ea1m gi\u1eefa bi nghi\u1ec1n v\u00e0 b\u1ed9t trong th\u00f9ng l\u00e0 kh\u00f4ng \u0111\u1ee7, v\u00e0 vi\u1ec7c s\u00e0ng l\u1ecdc b\u1ed9t l\u00e0 kh\u00f4ng \u0111\u1ee7. Sau khi nghi\u1ec1n \u01b0\u1edbt trong 24 gi\u1edd (H\u00ecnh 3(b)), ng\u01b0\u1eddi ta nh\u1eadn th\u1ea5y k\u00edch th\u01b0\u1edbc b\u1ed9t gi\u1ea3m nhanh v\u00e0 \u0111\u1ed9 m\u1ecbn r\u00f5 r\u00e0ng nh\u01b0ng \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u c\u00f2n h\u1ea1n ch\u1ebf. C\u00f3 th\u1ec3 th\u1ea5y, hi\u1ec7n t\u01b0\u1ee3ng ph\u00e2n m\u1ea3nh b\u1ed9t ch\u1ee7 y\u1ebfu x\u1ea3y ra do s\u1ef1 va ch\u1ea1m v\u00e0 ma s\u00e1t l\u1eb7p \u0111i l\u1eb7p l\u1ea1i c\u1ee7a c\u00e1c vi\u00ean bi nghi\u1ec1n, d\u1eabn \u0111\u1ebfn v\u1ee1 c\u00e1c h\u1ea1t l\u1edbn th\u00e0nh c\u00e1c h\u1ea1t nh\u1ecf h\u01a1n. Ti\u1ebfp t\u1ee5c nghi\u1ec1n \u01b0\u1edbt \u0111\u1ebfn 30 gi\u1edd (H\u00ecnh 3(c)), c\u00f3 th\u1ec3 nh\u1eadn th\u1ea5y k\u00edch th\u01b0\u1edbc b\u1ed9t kh\u00f4ng c\u00f3 nhi\u1ec1u thay \u0111\u1ed5i nh\u01b0ng \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u v\u00e0 h\u00ecnh th\u00e1i \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n, v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh t\u1eeb 1 \u0111\u1ebfn 2 \u03bcm. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y b\u1ed9t \u0111\u1ea5t \u01b0\u1edbt trong 30 gi\u1edd c\u00f3 k\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh th\u00e1i h\u1ea1t t\u01b0\u01a1ng \u0111\u1ed1i l\u00fd t\u01b0\u1edfng. Ngo\u00e0i vi\u1ec7c b\u1ecb v\u1ee1, b\u1ed9t ch\u1ee7 y\u1ebfu b\u1ecb m\u00f2n (c\u00e1c g\u00f3c WC b\u1ecb m\u00f2n, t\u1ea1o th\u00e0nh b\u1ed9t m\u1ecbn). Cu\u1ed1i c\u00f9ng, sau khi nghi\u1ec1n \u01b0\u1edbt trong 36 gi\u1edd, r\u00f5 r\u00e0ng l\u00e0 b\u1ed9t kh\u00f4ng nh\u1eefng kh\u00f4ng \u0111\u01b0\u1ee3c tinh ch\u1ebf th\u00eam m\u00e0 c\u00f2n xu\u1ea5t hi\u1ec7n hi\u1ec7n t\u01b0\u1ee3ng k\u1ebft t\u1ee5 B (xem H\u00ecnh 3(d)).<\/p>\n

\"th\u1eddi<\/p>\n

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C\u1ea7n l\u01b0u \u00fd r\u1eb1ng b\u1ed9t kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c tinh ch\u1ebf v\u00f4 h\u1ea1n trong qu\u00e1 tr\u00ecnh nghi\u1ec1n bi. Trong qu\u00e1 tr\u00ecnh nghi\u1ec1n bi, khi k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a b\u1ed9t gi\u1ea3m, di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang c\u1ee7a b\u1ed9t t\u0103ng theo c\u1ea5p s\u1ed1 nh\u00e2n, th\u1ec3 hi\u1ec7n n\u0103ng l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t cao v\u00e0 kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng t\u0103ng m\u1ea1nh, d\u1ec5 k\u1ebft t\u1ee5 v\u00e0 li\u00ean k\u1ebft v\u1edbi c\u00e1c lo\u1ea1i b\u1ed9t kh\u00e1c \u0111\u1ec3 ch\u1ed1ng l\u1ea1i s\u1ef1 t\u0103ng t\u1ed5ng kh\u1ed1i l\u01b0\u1ee3ng. n\u0103ng l\u01b0\u1ee3ng. K\u1ebft qu\u1ea3 l\u00e0, m\u1ed9t m\u1eb7t, n\u0103ng l\u01b0\u1ee3ng b\u00ean ngo\u00e0i \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o b\u1ed9t, khi\u1ebfn b\u1ed9t \u0111\u01b0\u1ee3c tinh ch\u1ebf; m\u1eb7t kh\u00e1c, b\u1ed9t k\u1ebft t\u1ee5 v\u00e0 t\u1ea1o th\u00e0nh c\u1ee5c, l\u00e0m gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 th\u1ed1ng. Sau t\u00e1c \u0111\u1ed9ng k\u1ebft h\u1ee3p c\u1ee7a hai xu h\u01b0\u1edbng n\u00e0y, tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u1eefa ch\u00fang v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh c\u1ee7a b\u1ed9t cu\u1ed1i c\u00f9ng s\u1ebd \u1ed5n \u0111\u1ecbnh trong m\u1ed9t ph\u1ea1m vi nh\u1ea5t \u0111\u1ecbnh. Trong th\u00ed nghi\u1ec7m n\u00e0y, b\u1ed9t \u0111\u01b0\u1ee3c nghi\u1ec1n bi trong 30 gi\u1edd v\u00e0 c\u00f3 \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u t\u1ed1t, k\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u1ea1t gi\u00e1 tr\u1ecb c\u00e2n b\u1eb1ng (1-2 \u03bcm).<\/p>\n

H\u00ecnh 4 cho th\u1ea5y c\u00e1c m\u1eabu XRD c\u1ee7a cacbua xi m\u0103ng t\u00e1i sinh thi\u00eau k\u1ebft v\u1edbi th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau. Nh\u01b0 th\u1ec3 hi\u1ec7n tr\u00ean h\u00ecnh, khi nghi\u1ec1n \u01b0\u1edbt trong 18 gi\u1edd, h\u1ee3p kim ch\u1ee9a pha t\u1ea1p ch\u1ea5t cacbon nguy\u00ean t\u1ed1 (C); khi qu\u00e1 tr\u00ecnh nghi\u1ec1n \u01b0\u1edbt ti\u1ebfp t\u1ee5c, nguy\u00ean t\u1ed1 cacbon bi\u1ebfn m\u1ea5t. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y h\u1ee3p kim \u0111\u01b0\u1ee3c cacbon h\u00f3a nh\u1eb9 trong qu\u00e1 tr\u00ecnh nghi\u1ec1n \u01b0\u1edbt trong 18 gi\u1edd v\u00e0 khi th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt k\u00e9o d\u00e0i, b\u1ed9t \u0111\u01b0\u1ee3c tinh ch\u1ebf v\u00e0 b\u1ec1 m\u1eb7t h\u1ea5p th\u1ee5 nhi\u1ec1u oxy h\u01a1n, d\u1eabn \u0111\u1ebfn h\u00e0m l\u01b0\u1ee3ng oxy trong h\u1ed7n h\u1ee3p t\u0103ng l\u00ean. Trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, m\u1ed9t ph\u1ea7n carbon \u0111\u01b0\u1ee3c ti\u00eau th\u1ee5, d\u1eabn \u0111\u1ebfn s\u1ef1 h\u00ecnh th\u00e0nh c\u1ea5u tr\u00fac hai pha tinh khi\u1ebft c\u1ee7a WC v\u00e0 Co trong h\u1ee3p kim v\u00e0 kh\u00f4ng t\u00ecm th\u1ea5y pha t\u1ea1p ch\u1ea5t n\u00e0o kh\u00e1c.<\/p>\n

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H\u00ecnh 5 cho th\u1ea5y c\u00e1c h\u00ecnh \u1ea3nh kim lo\u1ea1i c\u1ee7a cacbua xi m\u0103ng sau khi \u0103n m\u00f2n \u1edf c\u00e1c th\u1eddi \u0111i\u1ec3m nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau. So s\u00e1nh H\u00ecnh 5 (a) v\u1edbi (d), c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft (1723 K, \u00e1p su\u1ea5t), c\u1ea5u tr\u00fac h\u1ee3p kim t\u1ed1t v\u00e0 kh\u00f4ng t\u00ecm th\u1ea5y khuy\u1ebft t\u1eadt n\u00e0o nh\u01b0 h\u1ea1t WC v\u00e0 v\u0169ng coban l\u1edbn b\u1ea5t th\u01b0\u1eddng. K\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a h\u1ee3p kim nh\u1ecf h\u01a1n m\u1ed9t ch\u00fat v\u1edbi h\u00ecnh th\u00e1i \u0111a gi\u00e1c sau khi nghi\u1ec1n \u01b0\u1edbt trong 24 gi\u1edd so v\u1edbi 18 gi\u1edd v\u00e0 pha Co \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed5 \u0111\u1ec1u. Khi qu\u00e1 tr\u00ecnh nghi\u1ec1n \u01b0\u1edbt ti\u1ebfp t\u1ee5c, kh\u00f4ng c\u00f3 s\u1ef1 thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 v\u1ec1 k\u00edch th\u01b0\u1edbc h\u1ea1t nh\u01b0ng \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n \u0111\u00f4i ch\u00fat. Khi nghi\u1ec1n \u01b0\u1edbt trong 36 gi\u1edd, ng\u01b0\u1eddi ta th\u1ea5y r\u1eb1ng c\u00e1c h\u1ea1t WC \u0111\u00e3 ph\u00e1t tri\u1ec3n nh\u1eb9, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 li\u00ean quan \u0111\u1ebfn s\u1ef1 k\u1ebft t\u1ee5 m\u1ed9t ph\u1ea7n c\u1ee7a b\u1ed9t trong qu\u00e1 tr\u00ecnh nghi\u1ec1n \u01b0\u1edbt.<\/p>\n

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\u0110i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd l\u00e0 khi th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt t\u0103ng l\u00ean, \u0111\u1ed9 b\u1ec1n c\u1ee7a h\u1ee3p kim c\u00f3 xu h\u01b0\u1edbng t\u0103ng li\u00ean t\u1ee5c, nh\u01b0ng m\u1ee9c \u0111\u1ed9 t\u0103ng ng\u00e0y c\u00e0ng nh\u1ecf h\u01a1n. N\u00f3i chung, \u0111\u1ed1i v\u1edbi c\u00f9ng h\u00e0m l\u01b0\u1ee3ng Co v\u00e0 kh\u00f4ng c\u00f3 khuy\u1ebft t\u1eadt r\u00f5 r\u00e0ng, \u0111\u1ed9 b\u1ec1n c\u1ee7a h\u1ee3p kim c\u00f3 li\u00ean quan \u0111\u1ebfn s\u1ef1 ph\u00e2n b\u1ed1 c\u00e1c l\u1ed7 ch\u00e2n l\u00f4ng si\u00eau nh\u1ecf b\u00ean trong v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t WC. Khi nghi\u1ec1n \u01b0\u1edbt trong 18 gi\u1edd, do th\u1eddi gian ng\u1eafn n\u00ean v\u1eadt li\u1ec7u tr\u1ed9n kh\u00f4ng \u0111\u1ec1u, \u0111\u1ed9 tinh luy\u1ec7n b\u1ed9t kh\u00f4ng \u0111\u1ee7, k\u00edch th\u01b0\u1edbc h\u1ea1t l\u1edbn v\u00e0 ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, d\u1eabn \u0111\u1ebfn d\u1ec5 h\u00ecnh th\u00e0nh c\u00e1c l\u1ed7 ch\u00e2n l\u00f4ng si\u00eau nh\u1ecf trong qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft, do \u0111\u00f3 \u0111\u1ed9 b\u1ec1n h\u1ee3p kim kh\u00f4ng cao. Ti\u1ebfp t\u1ee5c nghi\u1ec1n \u01b0\u1edbt s\u1ebd ph\u00e1 v\u1ee1 c\u00e1c h\u1ea1t b\u1ed9t h\u01a1n n\u1eefa, t\u0103ng s\u1ed1 l\u01b0\u1ee3ng h\u1ea1t WC m\u1ecbn, thu h\u1eb9p s\u1ef1 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t WC theo h\u01b0\u1edbng \u0111\u1ed3ng nh\u1ea5t v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c h\u1ea1t WC th\u00f4, v\u1ed1n l\u00e0 nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y ra v\u1ebft n\u1ee9t, d\u1eabn \u0111\u1ebfn t\u0103ng \u0111\u1ed9 b\u1ec1n u\u1ed1n c\u1ee7a h\u1ee3p kim.<\/p>\n

Trong c\u00e1c h\u1ee3p kim WC-Co c\u00f3 c\u00f9ng h\u00e0m l\u01b0\u1ee3ng Co, l\u1ef1c c\u01b0\u1ee1ng b\u1ee9c c\u1ee7a h\u1ee3p kim t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi k\u00edch th\u01b0\u1edbc v\u00e0 ph\u00e2n b\u1ed1 h\u1ea1t WC, ph\u00f9 h\u1ee3p v\u1edbi m\u00f4 t\u1ea3 trong H\u00ecnh 5.<\/p>\n

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H\u00ecnh 6 cho th\u1ea5y s\u1ef1 ph\u00e2n b\u1ed1 c\u01b0\u1eddng \u0111\u1ed9 u\u1ed1n c\u1ee7a cacbua xi m\u0103ng t\u00e1i sinh v\u1edbi th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau. D\u1ef1a tr\u00ean H\u00ecnh 6, c\u00f3 th\u1ec3 quan s\u00e1t \u0111\u01b0\u1ee3c ph\u1ea1m vi gi\u00e1 tr\u1ecb c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a t\u1eebng h\u1ee3p kim, \u0111i\u1ec1u n\u00e0y mang l\u1ea1i s\u1ef1 thay \u0111\u1ed5i v\u1ec1 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a c\u00e1c m\u1eabu th\u1ed1ng k\u00ea. T\u1eeb h\u00ecnh v\u1ebd c\u00f3 th\u1ec3 th\u1ea5y c\u00f3 nhi\u1ec1u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 ph\u00e2n t\u00e1n trong k\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m. C\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng nh\u1eadn th\u1ea5y r\u1eb1ng khi k\u00e9o d\u00e0i th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt, kh\u00f4ng ch\u1ec9 \u0111\u1ed9 b\u1ec1n c\u1ee7a h\u1ee3p kim t\u0103ng l\u00ean m\u00e0 ph\u1ea1m vi dao \u0111\u1ed9ng c\u0169ng tr\u1edf n\u00ean h\u1eb9p h\u01a1n v\u00e0 m\u1ed7i gi\u00e1 tr\u1ecb c\u01b0\u1eddng \u0111\u1ed9 c\u0169ng g\u1ea7n nhau h\u01a1n. \u0110i\u1ec1u n\u00e0y ch\u1ec9 ra r\u1eb1ng vi\u1ec7c k\u00e9o d\u00e0i th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m s\u1ef1 r\u1eddi r\u1ea1c trong ph\u00e2n b\u1ed1 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a cacbua xi m\u0103ng t\u00e1i sinh.<\/p>\n

 <\/p>\n

S\u1ef1 k\u1ebft lu\u1eadn<\/h1>\n

Trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u00ed nghi\u1ec7m c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y, \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau \u0111\u1ebfn c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a b\u1ed9t composite WC-8Co t\u00e1i ch\u1ebf v\u00e0 h\u1ee3p kim c\u1ee9ng thi\u00eau k\u1ebft \u0111\u00e3 \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u v\u00e0 r\u00fat ra c\u00e1c k\u1ebft lu\u1eadn sau:<\/p>\n

    \n
  1. Nghi\u1ec1n \u01b0\u1edbt li\u00ean t\u1ee5c trong 30 gi\u1edd v\u1edbi t\u1ef7 l\u1ec7 bi-b\u1ed9t l\u00e0 3:1 t\u1ea1o ra b\u1ed9t composite m\u1ecbn v\u00e0 ph\u00e2n b\u1ed1 \u0111\u1ed3ng \u0111\u1ec1u v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh l\u00e0 1-2 \u03bcm, theo quan s\u00e1t c\u1ee7a SEM.<\/li>\n
  2. Trong \u0111i\u1ec1u ki\u1ec7n nghi\u1ec1n \u01b0\u1edbt li\u00ean t\u1ee5c trong 36 gi\u1edd v\u1edbi t\u1ef7 l\u1ec7 bi-b\u1ed9t l\u00e0 3:1 v\u00e0 qu\u00e1 tr\u00ecnh thi\u00eau k\u1ebft (1723 K trong 1 gi\u1edd v\u1edbi \u00e1p su\u1ea5t 5 MPa), h\u1ee3p kim th\u1ec3 hi\u1ec7n c\u00e1c \u0111\u1eb7c t\u00ednh to\u00e0n di\u1ec7n t\u1ed1t nh\u1ea5t. M\u1eadt \u0111\u1ed9 c\u1ee7a n\u00f3 l\u00e0 14,71 g\/cm\u00b3, HRA90,1, c\u01b0\u1eddng \u0111\u1ed9 trung b\u00ecnh l\u00e0 3560 MPa, t\u1eeb t\u00ednh coban l\u00e0 7,2% v\u00e0 \u0111\u1ed9 c\u01b0\u1ee1ng b\u1ee9c l\u00e0 15,8 kA\/m.<\/li>\n
  3. Ph\u00e2n t\u00edch s\u1ef1 ph\u00e2n b\u1ed1 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a h\u1ee3p kim v\u1edbi c\u00e1c th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt kh\u00e1c nhau cho th\u1ea5y trong m\u1ed9t ph\u1ea1m vi nh\u1ea5t \u0111\u1ecbnh, vi\u1ec7c k\u00e9o d\u00e0i th\u1eddi gian nghi\u1ec1n \u01b0\u1edbt c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m s\u1ef1 r\u1eddi r\u1ea1c trong ph\u00e2n b\u1ed1 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a h\u1ee3p kim c\u1ee9ng t\u00e1i ch\u1ebf.<\/li>\n<\/ol>\n<\/div>\n

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

    xay x\u00e1t \u01b0\u1edbt<\/p>","protected":false},"author":2,"featured_media":21760,"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-21756","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\/2023\/03\/\u56fe\u72477-1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21756","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=21756"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21756\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media\/21760"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=21756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=21756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=21756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}