US4330332A
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Process for the preparation of molybdenum-tungsten carbides
Assignee: Sandvik AB
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Filing: 1978-07-27
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Granted: 1982-05-18
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Expires: 1998-07-27
Abstract
Abstract PCT No. PCT/EP78/00004 Sec. 371 Date Apr. 9, 1979 Sec. 102(e) Date Apr. 5, 1979 PCT Filed Jul. 27, 1978 PCT Pub. No. WO79/00089 PCT Pub. Date Feb. 22, 1979. A process for the preparation of an extrahard material based on tungsten and molybdenum carbides and having a hexagonal crystal structure identical with that of tungsten carbide. According to this process, one heats between 1000 DEG C. and a temperature Tx, which is lower than the maximum stability limit of the MoxWl-xC phase wherein 0.01x1, a mixture, intimate to the molecular or atomic scale, of tungsten and molybdenum the total content of which in Fe, Ni and Co does not exceed 0.1% with carbon and/or a carbon compound. Tx is defined as follows: For 0.01<x<0.8, Tx=2700-1375x DEG C; For 0.8<x<1, Tx=3400-2250x DEG C.
Inventors
- 👤 Herbert Schachner
- 👤 Carl S. G. Ekemar
- 👤 Bengt O. Haglund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5626; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949; C22; C22C; C22C29/00; C22C29/02; C22C29/06; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/80; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A process for the preparation of an extrahard material based on a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and of formula Mo x W 1-x C wherein 0.01<x<1 which consists essentially of the following steps: (a) intimately contacting on a molecular level a compound having the formula (Mo x W 1-x ) 2 C where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon or a carbon-containing gas at least equal to the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with that of tungsten carbide; and (b) heating said compound of the formula (Mo x W 1-x ) 2 C in intimate contact with said carbon or said carbon-containing gas to a temperature between 1000° C. and a temperature T x lower than the maximum temperature limit of the domain of stability of the Mo x W 1-x C phase, T x being equal to 2700° C.-1375x° C. in the case where 0.01<x≦0.8 and equal to 3400° C.-2250x° C. in the case where 0.8≦x<1.
Claim 2
Dependent Claim
185 words
A process for the preparation of an extrahard material based on a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and of formula Mo x W 1-x C wherein 0.01<x<1 which consists essentially of the following steps: (a) intimately contacting on a molecular level a compound having the formula (Mo x W 1-x ) 2 C where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon or a carbon-containing gas at least equal to the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with that of tungsten carbide; and (b) heating said compound of the formula (Mo x W 1-x ) 2 C in intimate contact with said carbon or said carbon-containing gas to a temperature between 1000° C. and a temperature T x lower than the maximum temperature limit of the domain of stability of the Mo x W 1-x C phase, T x being equal to 2700° C.-1375x° C. in the case where 0.01<x≦0.8 and equal to 3400° C.-2250x° C. in the case where 0.8≦x<1.
Claim 3
Dependent Claim
166 words
A process for the preparation of an extrahard material based on a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and of formula Mo x W 1-x C wherein 0.2≦x≦0.8 which consists essentially of the following steps: (a) intimately contacting on a molecular level a compound having the formula (Mo x W 1-x ) 2 C where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon or a carbon-containing gas at least equal to the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with that of tungsten carbide; and (b) heating said compound of the formula (Mo x W 1-x ) 2 C in intimate contact with said carbon or said carbon-containing gas to a temperature between 1000° C. and a temperature T x lower than the maximum temperature limit of the domain of stability of the MoW 1-x C phase, T x being equal to 2700°-1375x° C.
Claim 4
Dependent Claim
166 words
A process for the preparation of an extrahard material based on a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and of formula Mo x W 1-x C wherein 0.2≦x≦0.8 which consists essentially of the following steps: (a) intimately contacting on a molecular level a compound having the formula (Mo x W 1-x ) 2 C where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon or a carbon-containing gas at least equal to the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with that of tungsten carbide; and (b) heating said compound of the formula (Mo x W 1-x ) 2 C in intimate contact with said carbon or said carbon-containing gas to a temperature between 1000° C. and a temperature T x lower than the maximum temperature limit of the domain of stability of the MoW 1-x C phase, T x being equal to 2700°-1375x° C.
Claim 5
Dependent Claim
227 words
A process for the preparation of an extrahard material in the form of a mixture of a solid solution of a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and selected from the group consisting of (Mc 0 .3 W 0 .7)C, (Mo 0 .5 W 0 .5)C, (Mo 0 .6 W 0 .4)C and (Mo 0 .8 W 0 .2)C and of a lower carbide of the formula (Mo x W 1-x ) 2 C where 0.2≦x≦0.8 which comprises the steps of: (a) intimately contacting a molybdenum tungsten alloy where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon lower than the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with tungsten carbide; and (b) heating said alloy and said amount of carbon lower than the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with tungsten carbide to a temperature of at least 1000° C. and sufficient to form said mixture and at most 228° C. in the case of (Mo 0 .3 W 0 .7)C; 2012° C. in the case of (Mo 0 .5 W 0 .5)C; 1875° C. in the case of (Mo 0 .6 W 0 .4)C; and 1600° C. in the case of (Mo 0 .8 W 0 .2)C.
Claim 6
Dependent Claim
227 words
A process for the preparation of an extrahard material in the form of a mixture of a solid solution of a metal carbide of hexagonal crystal structure identical with that of tungsten carbide and selected from the group consisting of (Mc 0 .3 W 0 .7)C, (Mo 0 .5 W 0 .5)C, (Mo 0 .6 W 0 .4)C and (Mo 0 .8 W 0 .2)C and of a lower carbide of the formula (Mo x W 1-x ) 2 C where 0.2≦x≦0.8 which comprises the steps of: (a) intimately contacting a molybdenum tungsten alloy where the total amount of Ni, Co and Fe therein does not exceed 0.1% with an amount of carbon lower than the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with tungsten carbide; and (b) heating said alloy and said amount of carbon lower than the stoichiometric amount required to form the metal carbide of hexagonal crystal structure identical with tungsten carbide to a temperature of at least 1000° C. and sufficient to form said mixture and at most 228° C. in the case of (Mo 0 .3 W 0 .7)C; 2012° C. in the case of (Mo 0 .5 W 0 .5)C; 1875° C. in the case of (Mo 0 .6 W 0 .4)C; and 1600° C. in the case of (Mo 0 .8 W 0 .2)C.
References Cited (Backward Citations)
US3077385A
Cited
GB1282307A
Cited
US3902917A
Cited
US3795522A
Cited
US3743499A
Cited
US4049380A
Cited
US4139374A
Cited
US4066451A
Cited
US4216009A
Cited
US4257809A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
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