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US4370149A
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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: 1981-01-23
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Granted: 1983-01-25
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Expires: 2001-01-23
Abstract
Abstract This invention relates to a diamond compact for a wire drawing die, which comprises 70 to 95% by volume of diamond powder with a particle size of at most 50 microns and the balance of a binder phase consisting of a carbide of WC or (Mo, W)C with a particle size of at most 1 micron and an iron group metal, the carbide and iron group metal in the binder phase being in such a proportion by weight that the content of the carbide is more than that corresponding to the eutectic composition.
Inventors
- 👤 Akio Hara
- 👤 Shuji Yazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:09
CPC Classifications
C; C22; C22C; C22C26/00; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B21; B21C; B21C3/00; B21C3/02; B21C3/025; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A diamond compact for a wire drawing die, which comprises 70 to 95% by volume of diamond powder with a particle size of at most 50 microns and the balance of a binder phase consisting of a carbide of WC or (Mo, W)C with a particle size of at most 1 micron and an iron group metal, the carbide and iron group metal in the binder phase being in such a proportion by weight that the content of the carbide is more than that corresponding to the eutectic composition.
Claim 2
Dependent Claim
89 words
A diamond compact for a wire drawing die, which comprises 70 to 95% by volume of diamond powder with a particle size of at most 50 microns and the balance of a binder phase consisting of a carbide of WC or (Mo, W)C with a particle size of at most 1 micron and an iron group metal, the carbide and iron group metal in the binder phase being in such a proportion by weight that the content of the carbide is more than that corresponding to the eutectic composition.
Claim 3
Dependent Claim
24 words
The diamond compact as claimed in claim 1, wherein the particle size of the diamond powder in the compact is 1 to 10 microns.
Claim 4
Dependent Claim
42 words
The diamond compact as claimed in claim 1, wherein the binder phase consists of 50% by weight or more of a carbide of (Mo, W)C containing Mo as a predominant component and 50% by weight or less of an iron group metal.
Claim 5
Dependent Claim
32 words
The diamond compact as claimed in claim 1, wherein the circumference of the diamond compact is surrounded by a cermet consisting of WC or (Mo, W)C combined with an iron group metal.
Claim 6
Dependent Claim
20 words
The diamond compact as claimed in claim 4, wherein the carbide of (Mo, W)C contains Mo as a predominant component.
Claim 7
Dependent Claim
23 words
The diamond compact as claimed in claim 4, wherein the iron group metal is in a proportion of 5 to 40% by weight.
Claim 8
Dependent Claim
33 words
The diamond compact as claimed in claim 1, wherein the carbide is partly replaced by at least on carbide selected from the group consisting of Ti, Zr, Hf, Cr, V, Ta and Nb.
Claim 9
Dependent Claim
36 words
The diamond compact as claimed in claim 4, wherein the carbide of the cermet is partly replaced by at least one carbide selected from the group consisting ot Ti, Zr, Hf, Cr, V, Ta and Nb.
Claim 10
Dependent Claim
136 words
A process for the production of a diamond compact for a wire drawing die, which comprises grinding and mixing diamond powder optionally with WC powder or (Mo, W)C powder using a pot and balls lined and coated respectively with a cermet consisting of WC or (Mo, W)C combined with an iron group metal, while during the same time, adding to the mixture a fine powder of the cermet with a particle size of at most 1 micron from the pot and balls, filling a ring-shaped cermet consisting of WC or (Mo, W)C presintered or combined with an iron group metal with the resulting mixed powder, subjecting to sintering at a temerature of at least 1200° C. under a pressure of at least 45 Kb and thereby combining the ring-shaped cermet with the diamond sintered body tightly.
Claim 11
Dependent Claim
136 words
A process for the production of a diamond compact for a wire drawing die, which comprises grinding and mixing diamond powder optionally with WC powder or (Mo, W)C powder using a pot and balls lined and coated respectively with a cermet consisting of WC or (Mo, W)C combined with an iron group metal, while during the same time, adding to the mixture a fine powder of the cermet with a particle size of at most 1 micron from the pot and balls, filling a ring-shaped cermet consisting of WC or (Mo, W)C presintered or combined with an iron group metal with the resulting mixed powder, subjecting to sintering at a temerature of at least 1200° C. under a pressure of at least 45 Kb and thereby combining the ring-shaped cermet with the diamond sintered body tightly.
Claim 12
Dependent Claim
17 words
The process as claimed in claim 9, wherein the (Mo, W)C contains Mo as a predominant component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |