Patent US3918138A successfully refreshed from Google Patents.
US3918138A
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Metallurgical composition embodying hard metal carbides, and method of making
Assignee: Kennametal Inc
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Filing: 1973-06-20
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Granted: 1975-11-11
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Expires: 1993-06-20
Abstract
Abstract A hard wear resistant metallurgical composition, particularly a sintered composition, utilizing hard metal carbides in which the composition can readily be formulated so as to be ferromagnetic or non-ferromagnetic. By non-ferromagnetic, hereinafter referred to as non-magnetic, a material is referred to which has magnetic permeability near unity and which is lacking in the ability to become magnetized or to exhibit induced magnetism, namely, a material with 0 oersted coercive force. The composition is, in general, a combination of tungsten, titanium, nickel and carbon, but may comprise other elements including chromium. In making the composition, tungsten carbide (WC) is admixed by milling with nickel (Ni) and titanium (Ti) and sintered. The titanium can react with carbon from the tungsten carbide and the released tungsten can alloy with nickel to form a tough binder. The characteristics of the end product can be tailored by controlling the proportions of the various components of the composition, including adjustment of the amount of titanium added to the mixture. The end product can, in this manner, be made magnetic or nonmagnetic, if desired, without losing the desirable characteristics of strength, hardness and wear resistance.
Inventors
- 👤 Bela J Nemeth
- 👤 Alden M Burghardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:20
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
A METHOD OF MAKING A SINTERED CARBIDE PRODUT WHICH COMPRISES MILLING TOGETHER A MIXTURE COMPRISING A MAJOR PART TUNGSTEN CARBIDE, TITANIUM, ABOUT 10 WEIGHT % NICKEL, COMPACTING THE MILLED MIXTURE, AND SINTERING THE COMPACTED MILLED MIXTURE TO FORM THE PRODUCT, THE SAID TITANIUM BEING ADDED TO THE MIXTURE CALCULATED IN AN AMOUNT TO DECARBURIZE THE TUNGSTEN CARBIDE TO A DEGREE WHICH WILL RELEASE TUNGSTEN TO FORM AN ALLOY WITH THE NICKEL UP TO ABOUT 28 WEIGHT % TUNGSTEN IN THE ALLOY.
Claim 2
Independent Claim
81 words
A METHOD OF MAKING A SINTERED CARBIDE PRODUT WHICH COMPRISES MILLING TOGETHER A MIXTURE COMPRISING A MAJOR PART TUNGSTEN CARBIDE, TITANIUM, ABOUT 10 WEIGHT % NICKEL, COMPACTING THE MILLED MIXTURE, AND SINTERING THE COMPACTED MILLED MIXTURE TO FORM THE PRODUCT, THE SAID TITANIUM BEING ADDED TO THE MIXTURE CALCULATED IN AN AMOUNT TO DECARBURIZE THE TUNGSTEN CARBIDE TO A DEGREE WHICH WILL RELEASE TUNGSTEN TO FORM AN ALLOY WITH THE NICKEL UP TO ABOUT 28 WEIGHT % TUNGSTEN IN THE ALLOY.
Claim 3
Dependent Claim
26 words
The method according to claim 1 which includes adding at least a part of the titanium in the form of an alloy of titanium and nickel.
Claim 4
Dependent Claim
22 words
The method according to claim 1 which includes adding at least a part of the titanium in the Form of titanium hydride.
Claim 5
Dependent Claim
17 words
The method according to claim 1 which includes adding about 1 weight % chromium to the mixture.
Claim 6
Dependent Claim
37 words
The method according to claim 1 wherein the titanium charged in the starting composition is such that the calculated ratio W/(W + Ni) in weight % ranges from about 14 to 28 and the composition in non-magnetic.
Claim 7
Independent Claim
42 words
The method of inhibiting grain growth during sintering in a powder metal compact which is formed from hard metal carbides and nickel which comprises adding about 0.05 to about 2.0 weight % Ti to the mixture from which the compact is formed.
Claim 8
Independent Claim
42 words
The method of inhibiting grain growth during sintering in a powder metal compact which is formed from hard metal carbides and nickel which comprises adding about 0.05 to about 2.0 weight % Ti to the mixture from which the compact is formed.
Claim 9
Dependent Claim
42 words
A sintered cemented carbide product whose composition comprises tungsten carbide, titanium carbide and a binder alloy comprising tungsten-nickel in which the ratio of the tungsten in the binder alloy to the binder alloy is from 2 to 28 per cent by weight.
Claim 10
Dependent Claim
42 words
A sintered cemented carbide product whose composition comprises tungsten carbide, titanium carbide and a binder alloy comprising tungsten-nickel in which the ratio of the tungsten in the binder alloy to the binder alloy is from 2 to 28 per cent by weight.
Claim 11
Dependent Claim
31 words
A product according to claim 7 that is non-ferromagnetic and has a ratio of tungsten in the binder alloy to the binder alloy of 15 to 28 per cent by weight.
Claim 12
Dependent Claim
32 words
A product according to claim 7 that has ferromagnetic properties and has a ratio of tungsten in the binder alloy to the binder alloy of less than 14 per cent by weight.
Claim 13
Dependent Claim
37 words
A product according to claim 8 in which the powders charged in the mixture before sintering are about the following percentages by weight: Nickel - 3.0 to 25.0 Titanium - .05 to 2.0 Tungsten Carbide - Balance
Claim 14
Dependent Claim
14 words
A product according to claim 8 in which the binder alloy further includes chromium.
Claim 15
Dependent Claim
43 words
A product according to claim 11 in which the powders are charged in the mixture before sintering in about the following percentages by weight: Nickel - 3.0 to 25.0 Titanium - .05 to 2.0 Chromium - 0.0 to 2.0 Tungsten Carbide - Balance
Claim 16
Dependent Claim
18 words
A product according to claim 10 in which the titanium is supplied in the form of titanium hydride.
Claim 17
Dependent Claim
27 words
A product according to claim 10 in which the titanium is supplied in the form of an alloy with at least a portion of the said nickel.
Claim 18
Dependent Claim
39 words
A product according to claim 8 in which the binder alloy further includes un-reacted titanium and the calculated ratio of the tungsten in the binder alloy to the binder alloy is from 15 to 28 per cent by weight.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |