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US4374900A
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Composite diamond compact for a wire drawing die and a process for the production of the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1979-06-29
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Granted: 1983-02-22
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Expires: 1999-06-29
Abstract
Abstract The present invention relates to a composite diamond compact for a wire drawing die, in which a part or all of the circumference of a diamond sintered body is surrounded by a cermet consisting of a hard compound of (Mo, W)C type carbide crystals containing molybdenum as a predominant component, bonded by an iron group metal, and the binder phase of the diamond sintered body contains an iron group metal and fine carbide crystals containing molybdenum as a predominant component.
Inventors
- 👤 Akio Hara
- 👤 Shuji Yazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:47
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B21; B21C; B21C3/00; B21C3/02; B21C3/025; B22F7/08; C; C22; C22C; C22C26/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685; B22F2999/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12146; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12576
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
78 words
A diamond compact in cylindrical form for a wire drawing die, in which a part or all of the circumference of a diamond sintered body is surrounded by a cermet consisting of a hard compound of (Mo, W)C type carbide crystals containing molybdenum as a predominant component, bonded by an iron group metal, and wherein the binder phase of the diamond sintered body contains an iron group metal and fine carbide crystals containing molybdenum as a predominant component.
Claim 2
Dependent Claim
78 words
A diamond compact in cylindrical form for a wire drawing die, in which a part or all of the circumference of a diamond sintered body is surrounded by a cermet consisting of a hard compound of (Mo, W)C type carbide crystals containing molybdenum as a predominant component, bonded by an iron group metal, and wherein the binder phase of the diamond sintered body contains an iron group metal and fine carbide crystals containing molybdenum as a predominant component.
Claim 3
Dependent Claim
39 words
The diamond compact as claimed in claim 1, wherein the hard compound phase contains carbide crystals of (Mo,W)C type containing molybdenum as a predominant component and at most 10% by volume of carbide crystals of M 2 C type.
Claim 4
Dependent Claim
30 words
The diamond compact as claimed in claim 1, wherein the iron group metal is in a proportion of 5 to 30% by volume based on the whole of the cermet.
Claim 5
Dependent Claim
23 words
The diamond compact as claimed in claim 1, wherein the diamond content in the diamond sintered body is at least 70% by volume.
Claim 6
Dependent Claim
26 words
The diamond compact as claimed in claim 1, wherein the particle size of the diamond crystals in the diamond sintered body is at most 10 microns.
Claim 7
Dependent Claim
33 words
The diamond compact as claimed in claim 1, wherein the iron group metal is selected from the group consisting of cobalt, nickel and alloys thereof and further contains a small amount of iron.
Claim 8
Dependent Claim
22 words
The diamond compact as claimed in claim 6, wherein the iron content is in a proportion of 0.1 to 20% by weight.
Claim 9
Dependent Claim
23 words
The diamond compact as claimed in claim 1, wherein the carbide crystals of (Mo, W)C type is represented by (Mo, W)C x (0.5×≦1).
Claim 10
Dependent Claim
23 words
The diamond compact as claimed in claim 8, wherein x is within a range of 0.8 to 0.98 in (Mo, W)C x .
Claim 11
Dependent Claim
42 words
The diamond compact as claimed in claim 1, wherein at least one element selected from the group consisting of beryllium, magnesium, calcium, silicon, phosphorus, manganese and rhenium is added to the binder metal in a proportion of 0.1 to 3% by weight.
Claim 12
Dependent Claim
30 words
The diamond compact as claimed in claim 1, wherein the hard compound phase contains at least one element selected from the group consisting of titanium, zirconium, hafnium, tantalum and niobium.
Claim 13
Dependent Claim
21 words
The diamond compact as claimed in claim 1, wherein the iron group metal contains at least 50% by weight of nickel.
Claim 14
Dependent Claim
24 words
The diamond compact as claimed in claim 1, wherein a part or all of the circumference of the cermet has a linear cut surface.
Claim 15
Dependent Claim
74 words
A process for the production of a diamond compact for a wire drawing die, which comprises filling a sintered ring-shaped cermet consisting of carbide crystals in the form of (Mo, W)C containing molybdenum as a predominant component, bonded by an iron group metal, with diamond powder, subjecting the diamond powder to high pressure sintering at a temperature and pressure at which diamond is stable and bonding the diamond sintered body coherently to the cermet.
Claim 16
Dependent Claim
74 words
A process for the production of a diamond compact for a wire drawing die, which comprises filling a sintered ring-shaped cermet consisting of carbide crystals in the form of (Mo, W)C containing molybdenum as a predominant component, bonded by an iron group metal, with diamond powder, subjecting the diamond powder to high pressure sintering at a temperature and pressure at which diamond is stable and bonding the diamond sintered body coherently to the cermet.
Claim 17
Dependent Claim
119 words
The process as claimed in claim 14, wherein the sintered ring-shaped cermet consisting of a hard compound of (Mo, W)C type carbide crystals containing molybdenum as a predominant component, bonded by an iron group metal selected from the group consisting of cobalt, nickel and alloys thereof and further containing iron, has at least one hole, the hole is filled with diamond powder, the diamond powder is subjected to high pressure sintering at a temperature and pressure at which the diamond is stable, and the eutectic composition liquid phase of the cermet is impregnated in the diamond crystal particles while fine carbide crystals containing molybdenum as a predominant component are precipitated in the binder phase of the diamond sintered body.
Claim 18
Dependent Claim
39 words
The process as claimed in claim 14, wherein the hard compound phase contains carbide crystals of (Mo, W)C type containing molybdenum as a predominant component and at most 10% by volume of carbide crystals of M 2 C type.
Claim 19
Dependent Claim
20 words
The process as claimed in claim 14, wherein the diamond powder has a particle size of at most 10 microns.
Claim 20
Dependent Claim
29 words
The process as claimed in claim 14, wherein the high pressure sintering of the diamond powder is carried out by firstly subjecting the diamond to pressure and then heating.
Claim 21
Dependent Claim
46 words
The process as claimed in claim 14, wherein the high pressure sintering of the diamond powder is carried out at a temperature and pressure at which diamond is stable, and at a temperature of at least 1200° C. and a pressure of at least 45 kbar.
Claim 22
Dependent Claim
31 words
The process as claimed in claim 14, wherein the (Mo, W)C base cermet, during the high pressure sintering, is cooled rapidly from the sintering temperature to the liquid phase disappearing temperature.
Claim 23
Dependent Claim
23 words
The process as claimed in claim 14, wherein the (Mo, W)C base cermet is sintered at a temperature of at most 1450° C.
Claim 24
Dependent Claim
29 words
The process as claimed in claim 14, wherein the diamond powder contains a substance capable of forming carbides of (Mo, W)C or carbides containing molybdenum as a predominant component.
Claim 25
Dependent Claim
31 words
The process as claimed in claim 22, wherein the carbide-forming substance is at least one substance selected from the group consisting of molybdenum powder, molybdenum carbide powder and tungsten carbide powder.
Claim 26
Dependent Claim
26 words
The process as claimed in claim 22, wherein the carbide-forming substance is contained in a proportion of 1 to 30% by volume to the diamond powder.
Claim 27
Dependent Claim
29 words
The process as claimed in claim 22, wherein the diamond powder contains further an iron group metal selected from the group consisting of cobalt, nickel, iron and alloys thereof.
Claim 28
Dependent Claim
24 words
The process as claimed in claim 22, wherein a thin partition is provided at the boundary of the cermet part and diamond powder part.
Claim 29
Dependent Claim
18 words
The process as claimed in claim 26, wherein the thin partition consists of a high melting point material.
Claim 30
Dependent Claim
36 words
The process as claimed in claim 27, wherein the high melting point material is selected from the group consisting of titanium, zirconium, hafnium, tantalum, niobium, chromium, molybdenum, tungsten, platinum, titanium nitride, zirconium nitride and hafnium nitride.
Claim 31
Dependent Claim
19 words
The process as claimed in claim 27, wherein the thin partition has a thickness of at most 0.5 mm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |