{"id":21406,"date":"2022-09-19T09:38:23","date_gmt":"2022-09-19T01:38:23","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=21406"},"modified":"2022-09-19T09:39:36","modified_gmt":"2022-09-19T01:39:36","slug":"4-key-points-you-may-need-to-know-about-cryogenic-treatment-process","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/4-key-point-you-can-need-to-know-about-cryogenic-treatment-process\/","title":{"rendered":"4 \u0110i\u1ec3m ch\u00ednh b\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n bi\u1ebft v\u1ec1 Quy tr\u00ecnh x\u1eed l\u00fd b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u00f4ng l\u1ea1nh"},"content":{"rendered":"
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1. ph\u00e1t tri\u1ec3n quy tr\u00ecnh x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh<\/h2>\n\n\n\n

X\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh th\u01b0\u1eddng s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p l\u00e0m m\u00e1t b\u1eb1ng nit\u01a1 l\u1ecfng, c\u00f3 th\u1ec3 l\u00e0m m\u00e1t ph\u00f4i xu\u1ed1ng d\u01b0\u1edbi -190oC. C\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd thay \u0111\u1ed5i \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 m\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. X\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c Li\u00ean X\u00f4 c\u0169 \u0111\u1ec1 xu\u1ea5t v\u00e0o n\u0103m 1939. Ph\u1ea3i \u0111\u1ebfn nh\u1eefng n\u0103m 1960, Hoa K\u1ef3 m\u1edbi \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh v\u00e0o ng\u00e0nh c\u00f4ng nghi\u1ec7p v\u00e0 b\u1eaft \u0111\u1ea7u s\u1eed d\u1ee5ng ch\u1ee7 y\u1ebfu trong l\u0129nh v\u1ef1c h\u00e0ng kh\u00f4ng. V\u00e0o nh\u1eefng n\u0103m 1970, n\u00f3 m\u1edf r\u1ed9ng sang l\u0129nh v\u1ef1c s\u1ea3n xu\u1ea5t m\u00e1y m\u00f3c.<\/p>\n\n\n\n

Theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p l\u00e0m l\u1ea1nh kh\u00e1c nhau, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh ph\u01b0\u01a1ng ph\u00e1p l\u1ecfng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p kh\u00ed. Ph\u01b0\u01a1ng ph\u00e1p l\u1ecfng c\u00f3 ngh\u0129a l\u00e0 v\u1eadt li\u1ec7u ho\u1eb7c ph\u00f4i \u0111\u01b0\u1ee3c nh\u00fang tr\u1ef1c ti\u1ebfp v\u00e0o nit\u01a1 l\u1ecfng \u0111\u1ec3 l\u00e0m ngu\u1ed9i ph\u00f4i \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 nit\u01a1 l\u1ecfng, v\u00e0 ph\u00f4i \u0111\u01b0\u1ee3c gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, sau \u0111\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a ra ngo\u00e0i v\u00e0 nung n\u00f3ng \u0111\u1ebfn m\u1ed9t nhi\u1ec7t \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh. . R\u1ea5t kh\u00f3 \u0111\u1ec3 ki\u1ec3m so\u00e1t t\u1ed1c \u0111\u1ed9 t\u0103ng v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 theo c\u00e1ch n\u00e0y, \u0111i\u1ec1u n\u00e0y c\u00f3 t\u00e1c \u0111\u1ed9ng nhi\u1ec7t l\u1edbn \u0111\u1ebfn ph\u00f4i v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c cho l\u00e0 c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y h\u01b0 h\u1ecfng cho ph\u00f4i. Thi\u1ebft b\u1ecb \u0111\u00f4ng l\u1ea1nh t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n, ch\u1eb3ng h\u1ea1n nh\u01b0 b\u00ecnh nit\u01a1 l\u1ecfng.<\/p>\n\n\n\n

2. ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nhgas<\/h2>\n\n\n\n

Nguy\u00ean l\u00fd kh\u00ed l\u00e0 l\u00e0m m\u00e1t b\u1eb1ng nhi\u1ec7t \u1ea9n kh\u00ed h\u00f3a c\u1ee7a nit\u01a1 l\u1ecfng (kho\u1ea3ng 199,54kJ\/kg) v\u00e0 s\u1ef1 h\u1ea5p th\u1ee5 nhi\u1ec7t c\u1ee7a nit\u01a1 \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Ph\u01b0\u01a1ng ph\u00e1p kh\u00ed c\u00f3 th\u1ec3 l\u00e0m cho nhi\u1ec7t \u0111\u1ed9 \u0111\u00f4ng l\u1ea1nh \u0111\u1ea1t t\u1edbi - 190oC, do \u0111\u00f3 nit\u01a1 \u0111\u00f4ng l\u1ea1nh c\u00f3 th\u1ec3 ti\u1ebfp x\u00fac v\u1edbi v\u1eadt li\u1ec7u. Th\u00f4ng qua trao \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed1i l\u01b0u, nit\u01a1 c\u00f3 th\u1ec3 bay h\u01a1i trong h\u1ed9p \u0111\u00f4ng l\u1ea1nh sau khi \u0111\u01b0\u1ee3c \u0111\u1ea9y ra kh\u1ecfi v\u00f2i phun. Ph\u00f4i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m m\u00e1t b\u1eb1ng nhi\u1ec7t \u1ea9n c\u1ee7a qu\u00e1 tr\u00ecnh kh\u00ed h\u00f3a v\u00e0 s\u1ef1 h\u1ea5p th\u1ee5 nhi\u1ec7t c\u1ee7a nit\u01a1 \u0111\u00f4ng l\u1ea1nh. B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t \u0111\u1ea7u v\u00e0o c\u1ee7a nit\u01a1 l\u1ecfng \u0111\u1ec3 ki\u1ec3m so\u00e1t t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t, nhi\u1ec7t \u0111\u1ed9 x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh t\u1ef1 \u0111\u1ed9ng v\u00e0 ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c, hi\u1ec7u \u1ee9ng s\u1ed1c nhi\u1ec7t nh\u1ecf n\u00ean kh\u1ea3 n\u0103ng b\u1ecb n\u1ee9t c\u0169ng nh\u1ecf.<\/p>\n\n\n\n

Hi\u1ec7n nay, ph\u01b0\u01a1ng ph\u00e1p kh\u00ed \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00f4ng nh\u1eadn r\u1ed9ng r\u00e3i trong \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3, v\u00e0 thi\u1ebft b\u1ecb l\u00e0m m\u00e1t c\u1ee7a n\u00f3 ch\u1ee7 y\u1ebfu l\u00e0 h\u1ed9p l\u1ea1nh c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh v\u1edbi nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c. X\u1eed l\u00fd b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u00f4ng l\u1ea1nh c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 tu\u1ed5i th\u1ecd, kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a kim lo\u1ea1i \u0111en, kim lo\u1ea1i m\u00e0u, h\u1ee3p kim kim lo\u1ea1i v\u00e0 c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c, mang l\u1ea1i l\u1ee3i \u00edch kinh t\u1ebf \u0111\u00e1ng k\u1ec3 v\u00e0 tri\u1ec3n v\u1ecdng th\u1ecb tr\u01b0\u1eddng.<\/p>\n\n\n\n

C\u00f4ng ngh\u1ec7 \u0111\u00f4ng l\u1ea1nh c\u1ee7a cacbua xi m\u0103ng l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o v\u00e0o nh\u1eefng n\u0103m 1980 v\u00e0 1990. C\u00f4ng ngh\u1ec7 c\u01a1 kh\u00ed<\/em> c\u1ee7a Nh\u1eadt B\u1ea3n n\u0103m 1981 v\u00e0 C\u1eeda h\u00e0ng m\u00e1y hi\u1ec7n \u0111\u1ea1i<\/em> c\u1ee7a Hoa K\u1ef3 v\u00e0o n\u0103m 1992 b\u00e1o c\u00e1o r\u1eb1ng hi\u1ec7u su\u1ea5t c\u1ee7a cacbua xi m\u0103ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh. T\u1eeb nh\u1eefng n\u0103m 1970, c\u00f4ng vi\u1ec7c nghi\u00ean c\u1ee9u v\u1ec1 x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh \u1edf n\u01b0\u1edbc ngo\u00e0i \u0111\u00e3 c\u00f3 k\u1ebft qu\u1ea3. Li\u00ean X\u00f4 c\u0169, Hoa K\u1ef3, Nh\u1eadt B\u1ea3n v\u00e0 c\u00e1c n\u01b0\u1edbc kh\u00e1c \u0111\u00e3 s\u1eed d\u1ee5ng th\u00e0nh c\u00f4ng ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh \u0111\u1ec3 c\u1ea3i thi\u1ec7n tu\u1ed5i th\u1ecd c\u1ee7a d\u1ee5ng c\u1ee5 v\u00e0 khu\u00f4n, kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a ph\u00f4i v\u00e0 \u1ed5n \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

3. t\u0103ng c\u01b0\u1eddng c\u01a1 ch\u1ebf \u0111i\u1ec1u tr\u1ecb \u0111\u00f4ng l\u1ea1nh<\/h2>\n\n\n\n

Gia c\u1ed1 pha kim lo\u1ea1i.<\/h3>\n\n\n\n

Co trong cacbua li\u00ean k\u1ebft c\u00f3 c\u1ea5u tr\u00fac tinh th\u1ec3 fcc pha \u03b1 (fcc) v\u00e0 c\u1ea5u tr\u00fac tinh th\u1ec3 l\u1ee5c gi\u00e1c \u0111\u00f3ng g\u00f3i k\u00edn \u03b5 Pha (hcp). \u03b5- T\u1ef7 s\u1ed1 Co \u03b1- Co c\u00f3 h\u1ec7 s\u1ed1 ma s\u00e1t nh\u1ecf v\u00e0 ch\u1ecbu m\u00e0i m\u00f2n m\u1ea1nh. Tr\u00ean 417 \u2103 \u03b1 N\u0103ng l\u01b0\u1ee3ng t\u1ef1 do c\u1ee7a pha th\u1ea5p n\u00ean t\u1ed3n t\u1ea1i d\u1ea1ng pha Co \u03b1. D\u01b0\u1edbi 417 \u2103 \u03b5 N\u0103ng l\u01b0\u1ee3ng t\u1ef1 do c\u1ee7a pha th\u1ea5p, pha \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao \u03b1 Chuy\u1ec3n pha sang pha c\u00f3 n\u0103ng l\u01b0\u1ee3ng t\u1ef1 do th\u1ea5p \u03b5 Pha. Tuy nhi\u00ean, do c\u00e1c h\u1ea1t WC v\u00e0 \u03b1 S\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a c\u00e1c d\u1ecb nguy\u00ean t\u1eed trong dung d\u1ecbch r\u1eafn trong pha c\u00f3 h\u1ea1n ch\u1ebf l\u1edbn h\u01a1n \u0111\u1ed1i v\u1edbi s\u1ef1 chuy\u1ec3n pha, l\u00e0m cho \u03b1 \u2192 \u03b5 Khi \u0111i\u1ec7n tr\u1edf thay \u0111\u1ed5i pha t\u0103ng v\u00e0 nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 417 \u2103 \u03b1 th\u00ec pha kh\u00f4ng th\u1ec3 chuy\u1ec3n ho\u00e0n to\u00e0n. th\u00e0nh \u03b5 Pha. X\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 \u03b1 V\u00e0 \u03b5 S\u1ef1 ch\u00eanh l\u1ec7ch n\u0103ng l\u01b0\u1ee3ng t\u1ef1 do hai pha, do \u0111\u00f3 l\u00e0m t\u0103ng \u0111\u1ed9ng l\u1ef1c c\u1ee7a s\u1ef1 thay \u0111\u1ed5i pha \u03b5 Bi\u1ebfn s\u1ed1 thay \u0111\u1ed5i pha. \u0110\u1ed1i v\u1edbi cacbua li\u00ean k\u1ebft sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh, m\u1ed9t s\u1ed1 nguy\u00ean t\u1eed h\u00f2a tan trong Co k\u1ebft t\u1ee7a \u1edf d\u1ea1ng h\u1ee3p ch\u1ea5t do gi\u1ea3m \u0111\u1ed9 h\u00f2a tan, c\u00f3 th\u1ec3 l\u00e0m t\u0103ng pha c\u1ee9ng trong ma tr\u1eadn Co, c\u1ea3n tr\u1edf s\u1ef1 di chuy\u1ec3n l\u1ec7ch v\u1ecb tr\u00ed v\u00e0 \u0111\u00f3ng vai tr\u00f2 t\u0103ng c\u01b0\u1eddng pha th\u1ee9 hai. v\u1eadt r\u1ea5t nh\u1ecf.<\/p>\n\n\n\n

T\u0103ng c\u01b0\u1eddng \u1ee9ng su\u1ea5t d\u01b0 b\u1ec1 m\u1eb7t.<\/h3>\n\n\n\n

Nghi\u00ean c\u1ee9u sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh cho th\u1ea5y \u1ee9ng su\u1ea5t n\u00e9n d\u01b0 tr\u00ean b\u1ec1 m\u1eb7t t\u0103ng l\u00ean. Nhi\u1ec1u nh\u00e0 nghi\u00ean c\u1ee9u tin r\u1eb1ng m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ecbnh c\u1ee7a \u1ee9ng su\u1ea5t n\u00e9n d\u01b0 trong l\u1edbp b\u1ec1 m\u1eb7t c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 tu\u1ed5i th\u1ecd c\u1ee7a n\u00f3. Trong qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i c\u1ee7a cacbua xi m\u0103ng sau khi thi\u00eau k\u1ebft, pha li\u00ean k\u1ebft Co ch\u1ecbu \u1ee9ng su\u1ea5t k\u00e9o, v\u00e0 c\u00e1c h\u1ea1t WC ph\u1ea3i ch\u1ecbu \u1ee9ng su\u1ea5t n\u00e9n. \u1ee8ng su\u1ea5t k\u00e9o c\u00f3 t\u00e1c h\u1ea1i l\u1edbn \u0111\u1ed1i v\u1edbi Co. Do \u0111\u00f3, m\u1ed9t s\u1ed1 nh\u00e0 nghi\u00ean c\u1ee9u tin r\u1eb1ng s\u1ef1 gia t\u0103ng \u1ee9ng su\u1ea5t n\u00e9n b\u1ec1 m\u1eb7t do l\u00e0m ngu\u1ed9i s\u00e2u s\u1ebd l\u00e0m ch\u1eadm l\u1ea1i ho\u1eb7c b\u00f9 \u0111\u1eafp m\u1ed9t ph\u1ea7n \u1ee9ng su\u1ea5t k\u00e9o t\u1ea1o ra b\u1edfi giai \u0111o\u1ea1n li\u00ean k\u1ebft trong qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i sau khi nung k\u1ebft, ho\u1eb7c th\u1eadm ch\u00ed \u0111i\u1ec1u ch\u1ec9nh n\u00f3 \u0111\u1ec3 \u1ee9ng su\u1ea5t n\u00e9n, gi\u1ea3m s\u1ef1 ph\u00e1t sinh c\u00e1c v\u1ebft n\u1ee9t nh\u1ecf.<\/p>\n\n\n\n

C\u00e1c c\u01a1 ch\u1ebf t\u0103ng c\u01b0\u1eddng kh\u00e1c<\/h3>\n\n\n\n

Ng\u01b0\u1eddi ta tin r\u1eb1ng \u03b7 C\u00e1c h\u1ea1t pha c\u00f9ng v\u1edbi c\u00e1c h\u1ea1t WC l\u00e0m cho ma tr\u1eadn tr\u1edf n\u00ean ch\u1eb7t ch\u1ebd v\u00e0 ch\u1eafc ch\u1eafn h\u01a1n, v\u00e0 do \u03b7 S\u1ef1 h\u00ecnh th\u00e0nh c\u1ee7a pha ti\u00eau th\u1ee5 Co trong ma tr\u1eadn. S\u1ef1 gi\u1ea3m h\u00e0m l\u01b0\u1ee3ng Co trong pha li\u00ean k\u1ebft l\u00e0m t\u0103ng \u0111\u1ed9 d\u1eabn nhi\u1ec7t t\u1ed5ng th\u1ec3 c\u1ee7a v\u1eadt li\u1ec7u, v\u00e0 s\u1ef1 gia t\u0103ng k\u00edch th\u01b0\u1edbc h\u1ea1t cacbua v\u00e0 s\u1ef1 k\u1ec1 nhau c\u0169ng l\u00e0m t\u0103ng \u0111\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t n\u1ec1n. Do s\u1ef1 gia t\u0103ng c\u1ee7a \u0111\u1ed9 d\u1eabn nhi\u1ec7t, s\u1ef1 t\u1ea3n nhi\u1ec7t c\u1ee7a c\u00e1c \u0111\u1ea7u dao v\u00e0 khu\u00f4n d\u1eadp nhanh h\u01a1n; C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 \u0111\u1ed9 c\u1ee9ng nhi\u1ec7t \u0111\u1ed9 cao c\u1ee7a d\u1ee5ng c\u1ee5 v\u00e0 khu\u00f4n. Nh\u1eefng ng\u01b0\u1eddi kh\u00e1c tin r\u1eb1ng sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh, do Co co l\u1ea1i v\u00e0 c\u00f4 \u0111\u1eb7c, vai tr\u00f2 v\u1eefng ch\u1eafc c\u1ee7a Co trong vi\u1ec7c gi\u1eef c\u00e1c h\u1ea1t WC \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng. C\u00e1c nh\u00e0 v\u1eadt l\u00fd cho r\u1eb1ng vi\u1ec7c l\u00e0m l\u1ea1nh s\u00e2u \u0111\u00e3 l\u00e0m thay \u0111\u1ed5i c\u1ea5u tr\u00fac c\u1ee7a c\u00e1c nguy\u00ean t\u1eed v\u00e0 ph\u00e2n t\u1eed c\u1ee7a kim lo\u1ea1i.<\/p>\n\n\n\n

4.M\u1ed9t tr\u01b0\u1eddng h\u1ee3p YG20 Cold Heading Die v\u1edbi Cryogenic Treatment<\/h2>\n\n\n\n

C\u00e1c b\u01b0\u1edbc v\u1eadn h\u00e0nh c\u1ee7a x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh v\u00e1n khu\u00f4n tr\u1ee5 th\u00e9p YG20:<\/p>\n\n\n\n

(1) \u0110\u01b0a khu\u00f4n ngu\u1ed9i thi\u00eau k\u1ebft v\u00e0o l\u00f2 x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh;<\/p>\n\n\n\n

(2) Kh\u1edfi \u0111\u1ed9ng l\u00f2 t\u00edch h\u1ee3p \u1ee7 \u0111\u00f4ng l\u1ea1nh, m\u1edf nit\u01a1 l\u1ecfng, gi\u1ea3m xu\u1ed1ng -60oC \u1edf t\u1ed1c \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh v\u00e0 gi\u1eef nhi\u1ec7t \u0111\u1ed9 trong 1h;<\/p>\n\n\n\n

(3) Gi\u1ea3m xu\u1ed1ng -120oC \u1edf t\u1ed1c \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh v\u00e0 gi\u1eef nhi\u1ec7t \u0111\u1ed9 trong 2 gi\u1edd;<\/p>\n\n\n\n

(4) Gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 xu\u1ed1ng -190oC \u1edf t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t nh\u1ea5t \u0111\u1ecbnh v\u00e0 gi\u1eef nhi\u1ec7t \u0111\u1ed9 trong 4-8h;<\/p>\n\n\n\n

(5) Sau khi b\u1ea3o qu\u1ea3n nhi\u1ec7t, nhi\u1ec7t \u0111\u1ed9 s\u1ebd \u0111\u01b0\u1ee3c t\u0103ng l\u00ean 180 \u2103 theo 0,5 \u2103 \/ ph\u00fat trong 4 gi\u1edd<\/p>\n\n\n\n

(6) Sau khi thi\u1ebft b\u1ecb ch\u01b0\u01a1ng tr\u00ecnh ho\u00e0n th\u00e0nh, thi\u1ebft b\u1ecb s\u1ebd t\u1ef1 \u0111\u1ed9ng t\u1eaft ngu\u1ed3n v\u00e0 l\u00e0m m\u00e1t t\u1ef1 nhi\u00ean \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng.<\/p>\n\n\n\n

K\u1ebft lu\u1eadn: \u0110\u1ea7u khu\u00f4n l\u1ea1nh YG20 kh\u00f4ng qua x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh v\u00e0 sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh l\u00e0 \u0111\u1ea7u ngu\u1ed9i \u03a6 3.8 Thanh v\u00edt b\u1eb1ng th\u00e9p cacbon, k\u1ebft qu\u1ea3 cho th\u1ea5y tu\u1ed5i th\u1ecd c\u1ee7a khu\u00f4n sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh d\u00e0i h\u01a1n 15% so v\u1edbi khu\u00f4n kh\u00f4ng qua x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh .\"\"<\/p>\n\n\n\n

\"\"
(a) Tr\u01b0\u1edbc khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh YG20
(b) Sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh YG20<\/figcaption><\/figure>\n\n\n\n

C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng so v\u1edbi tr\u01b0\u1edbc khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh, coban l\u1eadp ph\u01b0\u01a1ng t\u00e2m m\u1eb7t (fcc) trong YG20 sau khi x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh gi\u1ea3m \u0111\u00e1ng k\u1ec3, \u03b5- S\u1ef1 gia t\u0103ng r\u00f5 r\u1ec7t c\u1ee7a Co (hcp) c\u0169ng l\u00e0 l\u00fd do c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 \u0111\u1eb7c t\u00ednh to\u00e0n di\u1ec7n c\u1ee7a cacbua xi m\u0103ng.<\/p>\n\n\n\n

5. H\u1ea1n ch\u1ebf c\u1ee7a qu\u00e1 tr\u00ecnh x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh<\/h2>\n\n\n\n

K\u1ebft qu\u1ea3 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a m\u1ed9t c\u00f4ng ty s\u1ea3n xu\u1ea5t d\u1ee5ng c\u1ee5 v\u00e0 khu\u00f4n \u0111\u00fac \u1edf Hoa K\u1ef3 cho th\u1ea5y tu\u1ed5i th\u1ecd c\u1ee7a mi\u1ebfng ch\u00e8n cacbua xi m\u0103ng sau khi x\u1eed l\u00fd t\u0103ng l\u00ean 2 ~ 8 l\u1ea7n, trong khi chu k\u1ef3 thay b\u0103ng c\u1ee7a khu\u00f4n k\u00e9o d\u00e2y cacbua xi m\u0103ng sau khi x\u1eed l\u00fd k\u00e9o d\u00e0i t\u1eeb v\u00e0i tu\u1ea7n \u0111\u1ebfn v\u00e0i th\u00e1ng. Trong nh\u1eefng n\u0103m 1990, nghi\u00ean c\u1ee9u trong n\u01b0\u1edbc v\u1ec1 c\u00f4ng ngh\u1ec7 \u0111\u00f4ng l\u1ea1nh c\u1ee7a cacbua xi m\u0103ng \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n v\u00e0 \u0111\u00e3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u nh\u1ea5t \u0111\u1ecbnh.<\/p>\n\n\n\n

Nh\u00ecn chung, nghi\u00ean c\u1ee9u v\u1ec1 c\u00f4ng ngh\u1ec7 x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh cacbua xi m\u0103ng hi\u1ec7n nay \u00edt \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n v\u00e0 ch\u01b0a c\u00f3 h\u1ec7 th\u1ed1ng, c\u00e1c k\u1ebft lu\u1eadn thu \u0111\u01b0\u1ee3c c\u0169ng kh\u00f4ng th\u1ed1ng nh\u1ea5t, c\u1ea7n \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n. Theo d\u1eef li\u1ec7u nghi\u00ean c\u1ee9u hi\u1ec7n c\u00f3, x\u1eed l\u00fd \u0111\u00f4ng l\u1ea1nh ch\u1ee7 y\u1ebfu c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a cacbua xi m\u0103ng, nh\u01b0ng kh\u00f4ng c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u00e0ng \u0111\u1ebfn c\u00e1c t\u00ednh ch\u1ea5t v\u1eadt l\u00fd.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

1.Development of Cryogenic Treatment Process Cryogenic treatment usually adopts liquid nitrogen cooling, which can cool the workpiece to below – 190 \u2103. The microstructure of the treated material changes at low temperature, and some properties are improved. Cryogenic treatment was first proposed by the former Soviet Union in 1939. It was not until the 1960s…<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21406"}],"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=21406"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21406\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=21406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=21406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=21406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}