US4608318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting having wear resistant compacts and method of manufacture
Assignee: Kennametal PC Inc
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Filing: 1984-04-17
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Granted: 1986-08-26
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Expires: 2004-04-17
Abstract
Abstract This invention relates to a double composite structure comprising cemented carbides embedded in an austenitic stainless steel matrix forming a wear, impact, drill and corrosion resistant shape by powder metallurgy techniques. Molten metal is then cast around the composite structure forming the body of a tool, lock or parts which are particularly useful for earthmoving and security applications.
Inventors
- 👤 Nicholas Makrides
- 👤 Earle W. Stephenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:03
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; B22D; B22D19/00; B22D19/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12139; Y10T428/12486
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
84 words
A tough wear resistant body comprising: a penetration resistant component formed by powder metallurgy methods of compaction and solid state diffusion bonding at temperatures between about 1900° F. and about 2250° F. and having cemented tungsten carbide particles with a size greater than 400 mesh, a stainless steel matrix, and wherein said particles are bonded to and located substantially within said stainless steel matrix; a second metallic matrix; and wherein said penetration resistant component is bonded to and embedded in said second metallic matrix.
Claim 2
Dependent Claim
84 words
A tough wear resistant body comprising: a penetration resistant component formed by powder metallurgy methods of compaction and solid state diffusion bonding at temperatures between about 1900° F. and about 2250° F. and having cemented tungsten carbide particles with a size greater than 400 mesh, a stainless steel matrix, and wherein said particles are bonded to and located substantially within said stainless steel matrix; a second metallic matrix; and wherein said penetration resistant component is bonded to and embedded in said second metallic matrix.
Claim 3
Dependent Claim
20 words
A tough wear resistant body according to claim 1 wherein said second metallic matrix substantially surrounds said penetration resistant component.
Claim 4
Dependent Claim
19 words
A tough wear resistant body according to claim 1 wherein said stainless steel matrix comprises an austenitic stainless steel.
Claim 5
Dependent Claim
16 words
A tough wear resistant body according to claim 3 wherein said second metallic matrix comprises steel.
Claim 6
Dependent Claim
21 words
A tough wear resistant body according to claim 1 wherein said cemented carbide particles have a size greater than 40 mesh.
Claim 7
Dependent Claim
37 words
A tough wear resistant body according to claim 5 wherein said cemented carbide particles further comprise a binder selected from the group consisting of cobalt, nickel, their alloys with each other, and their alloys with other metals.
Claim 8
Dependent Claim
22 words
A tough wear resistant body according to claim 3 wherein said matrix of austenitic stainless steel is less than 90 percent dense.
Claim 9
Dependent Claim
18 words
A tough wear resistant body according to claim 7 wherein said matrix is 75 to 85 percent dense.
Claim 10
Dependent Claim
18 words
A tough wear resistant body according to claim 1 wherein said cemented carbide particles have an irregular shape.
Claim 11
Dependent Claim
18 words
A tough wear resistant body according to claim 1 wherein said carbide particles have a bimodal size distribution.
Claim 12
Dependent Claim
55 words
A tough wear resistant product prepared by a process comprising the steps of: compacting a mixture of cemented tungsten carbide particles with a size greater than 400 mesh and a stainless steel powder; solid state sintering said compact at a temperature of 1900 to 2250 degrees Fahrenheit and bonding a molten metal to said compact.
Claim 13
Dependent Claim
55 words
A tough wear resistant product prepared by a process comprising the steps of: compacting a mixture of cemented tungsten carbide particles with a size greater than 400 mesh and a stainless steel powder; solid state sintering said compact at a temperature of 1900 to 2250 degrees Fahrenheit and bonding a molten metal to said compact.
Claim 14
Dependent Claim
23 words
The product prepared by the process according to claim 11 wherein said cemented carbide particles comprise 30 to 80 w/o of said compact.
Claim 15
Dependent Claim
17 words
The product prepared by the process according to claim 11 wherein said compacting step comprises isostatic compacting.
Claim 16
Dependent Claim
33 words
The product prepared by the process according to claim 11 further comprising the step of selecting cemented carbide particles having a mesh size greater than 40 mesh to be used in said mixture.
Claim 17
Dependent Claim
65 words
A metallic casting comprising: a base portion; a wall portion; said wall portion extending out of the plane of said base portion; a sintered compact of cemented carbide particles and stainless steel powder formed by solid state sintering at a temperature within the temperature range of between about 1900° F. and about 2250° F.; said compact bonded to and substantially contained within said wall portion.
Claim 18
Dependent Claim
65 words
A metallic casting comprising: a base portion; a wall portion; said wall portion extending out of the plane of said base portion; a sintered compact of cemented carbide particles and stainless steel powder formed by solid state sintering at a temperature within the temperature range of between about 1900° F. and about 2250° F.; said compact bonded to and substantially contained within said wall portion.
Claim 19
Dependent Claim
34 words
A metallic casting according to claim 15 wherein said wall has a first predetermined thickness; said compact has a second predetermined thickness; and said first predetermined thickness is greater than said second predetermined thickness.
Claim 20
Dependent Claim
19 words
A metallic casting according to claim 15 wherein said cemented carbide particles are substantially uniformly distributed through said compact.
Claim 21
Dependent Claim
19 words
A metallic casting according to claim 15 wherein said cemented carbide particles have a size greater than 400 mesh.
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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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |