US4063938A
Expired / Lapsed
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Method for producing a nitride based hard metal powder
Assignee: Individual
•
Filing: 1975-03-27
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Granted: 1977-12-20
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Expires: 1995-03-27
Abstract
Abstract Hard metal carbide alloys are produced by nitriding a mixture of finely divided refractory metals selected from group VI of the periodic table of elements, a refractory metal selected from group IV and V of the periodic table of elements and a metal selected from the iron group, under temperatures below 1250° for a time less than 12 hours.
Inventors
- 👤 Gerd Weissman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/14; B22F1/145; C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0068
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A method for nitriding refractory metals for the production of low oxygen nitride based hard metal alloys comprising the steps of admixing (A) a finely divided metal selected from the group consisting of the VI group of the periodic table of elements, (B) a finely divided refractory metal selected from the group consisting of metals of the IV or V groups of the periodic table of elements or mixtures thereof and (C) a finely divided auxiliary metal selected from the group consisting of the iron metals, and reacting said mixture with a gas containing nitrogen at a temperature and time sufficient to nitride said mixture.
Claim 2
Independent Claim
105 words
A method for nitriding refractory metals for the production of low oxygen nitride based hard metal alloys comprising the steps of admixing (A) a finely divided metal selected from the group consisting of the VI group of the periodic table of elements, (B) a finely divided refractory metal selected from the group consisting of metals of the IV or V groups of the periodic table of elements or mixtures thereof and (C) a finely divided auxiliary metal selected from the group consisting of the iron metals, and reacting said mixture with a gas containing nitrogen at a temperature and time sufficient to nitride said mixture.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said gas containing nitrogen is selected from the group consisting of NH 3 , N 2 .
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said unit (C) is selected from the group consisting of iron, nickel, cobalt.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein said unit (B) is selected from the group IV or V consisting of titanium, zirconium, hafnium vanadium, Niobium and tantalum.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said unit (A) is selected from the group consisting of chromium molybdenum, and tungsten.
Claim 7
Dependent Claim
53 words
The method of claim 1 wherein the mixture includes dimetallic carbides selected from the group consisting of the refractory metals of group V and VI of the periodic table of elements, and the mon-carbides of the refractory metals of groups IV, V and VI of the periodic table of elements or their mixtures.
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein the reaction is carried out at the temperature of between 600° and 1250° C.
Claim 9
Dependent Claim
60 words
The method of claim 7, in which the reaction is carried out in two consecutive stages, the first stage being performed during the period of 1 to 6 hours, at the temperature of between 600° and 900° C, while the second stage is performed during the period of 1 to 12 hours, at the temperature of 900° to 1250° C.
Claim 10
Dependent Claim
61 words
The method according to claim 8 wherein the reaction of the first stage is carried out for a period of between 2 - 4 hours at a temperature of between 700° - 800° C and the reaction of the second stage is carried out for a period of between 2 - 6 hours at a temperature between 1000° - 1100° C.
Claim 11
Dependent Claim
55 words
The method according to claim 1, wherein in the first stage a nitrogen containing gas is employed having a disproportionating effect under the catalytic influence of the finely distributed auxiliary metals of the iron group, and in the second stage a nitrogen containing gas is introduced under a pressure of between 1 and 20 atm.
Claim 12
Dependent Claim
15 words
The method according to claim 10 wherein said nitrogen containing gas is NH 3 .
Claim 13
Dependent Claim
18 words
The method of claim 1, in which a carboneous gas is introduced in the mixture during said reaction.
Claim 14
Dependent Claim
14 words
The method of claim 12, in which the carboneous gas is introduced before nitriding.
Claim 15
Dependent Claim
14 words
The method of claim 12, in which the carboneous gas is introduced during nitriding.
Claim 16
Dependent Claim
14 words
The method of claim 12, in which the carboneous gas is introduced after nitriding.
Claim 17
Dependent Claim
12 words
The method of claim 12, in which the carboneous gas is methane.
Claim 18
Dependent Claim
13 words
The method of claim 1, in which said nitrogen containing gas is methylamine.
Claim 19
Independent Claim
110 words
The method of producing a hard metal alloy comprising the steps of forming a nitrided reaction product of an admixture of (A) a finely divided metal selected from the group consisting of the VI group of the periodic table of elements, (B) a finely divided refractory metal selected from the group consisting of metals of the IV or V groups of the periodic table of elements or mixtures thereof and (C) a finely divided auxiliary metal selected from the group consisting of the iron metals by reacting said admixture with a gas containing nitrogen at a temperature and time sufficient to nitride said admixture, and thereafter sintering said reaction product.
Claim 20
Independent Claim
110 words
The method of producing a hard metal alloy comprising the steps of forming a nitrided reaction product of an admixture of (A) a finely divided metal selected from the group consisting of the VI group of the periodic table of elements, (B) a finely divided refractory metal selected from the group consisting of metals of the IV or V groups of the periodic table of elements or mixtures thereof and (C) a finely divided auxiliary metal selected from the group consisting of the iron metals by reacting said admixture with a gas containing nitrogen at a temperature and time sufficient to nitride said admixture, and thereafter sintering said reaction product.
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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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |