US4004889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered metal article having wear resistant surface
Assignee: Caterpillar Inc
•
Filing: 1975-10-06
•
Granted: 1977-01-25
•
Expires: 1995-10-06
Abstract
Abstract A powdered metal article having a fused wear resistant coating thereon is described. Specific embodiments of such article are disclosed including a specific powdered metal and a specific coating together with specific structural relationships therebetween. A method of making articles according to the teaching of this invention is described.
Inventors
- 👤 Preston Lee Gale
- 👤 James L. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:10
CPC Classifications
B; B22; B22F; B22F5/00; B22F7/00; F; F01; F01L; F01L3/00; F01L3/22; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T428/1216; Y10T428/12382; Y10T428/12472; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A metal article consisting of a body of a pressed, sintered and heat treated metallic powder of a first metal or metal alloy having a given melting temperature and a wear-surface of fused metal bonded to a surface of said body, said wear-surface having a fine dendritic structure and consisting of a second metal or metal alloy having a melting temperature approaching said given melting temperature of said first metal or metal alloy, said body having minute voids between the particles of said metallic powder and a portion of said fused metal of said wear-surface being received within said voids to a limited depth of not more than about 0.003 in (0.0076 cm) at said surface of said body without substantial alloying between said fused metal and said particles of said metallic powder.
Claim 2
Dependent Claim
133 words
A metal article consisting of a body of a pressed, sintered and heat treated metallic powder of a first metal or metal alloy having a given melting temperature and a wear-surface of fused metal bonded to a surface of said body, said wear-surface having a fine dendritic structure and consisting of a second metal or metal alloy having a melting temperature approaching said given melting temperature of said first metal or metal alloy, said body having minute voids between the particles of said metallic powder and a portion of said fused metal of said wear-surface being received within said voids to a limited depth of not more than about 0.003 in (0.0076 cm) at said surface of said body without substantial alloying between said fused metal and said particles of said metallic powder.
Claim 3
Dependent Claim
62 words
A metal article as claimed in claim 1 wherein said first metal or metal alloy is at least 95% iron alloyed with about 2% nickel, about 1/2% molybdenum and about 1/2% carbon and said second metal or metal alloy is at least 73% iron alloyed with about 20% chromium, about 21/2% silicon, about 11/2% nickel, about 3/4% carbon and about 1/2% manganese.
Claim 4
Dependent Claim
56 words
A metal article as claimed in claim 2 wherein said first metal or metal alloy includes not more than 1/2% copper and not more than 1% of all other elements and said second metal or metal alloy includes not more than 0.03% phosphorus and not more than 0.03% sulfur and essentially 0% of all other elements.
Claim 5
Dependent Claim
38 words
A metal article as claimed in claim 1 wherein said first metal or metal alloy has a melting temperature of about 1500° C and said second metal or metal alloy has a melting temperature of about 1400° C.
Claim 6
Dependent Claim
62 words
A metal article as claimed in claim 4 wherein said body of said first metal or metal alloy is a right circular cylinder having a beveled surface at one end thereof extending at an angle of about 20° with respect to the axis thereof and said wear-surface is bonded to said beveled surface at said one end of said right circular cylinder.
Claim 7
Dependent Claim
78 words
A metal article as claimed in claim 5 wherein said right circular cylinder has an outer diameter of about 1.8 inches, an inner diameter of about 1.5 inches and a length of about 0.36 inch, and said wear-surface has a thickness of about 0.25 inch with fused metal of said wear-surface received within voids in said body of said first metal or metal alloy to a depth of not more than about 0.003 inch below said beveled surface.
Claim 8
Dependent Claim
91 words
A metal article as claimed in claim 6 wherein said first metal or metal alloy is at least 95% iron alloyed with about 2% nickel, about 1/2% molybdenum, about 1/2% carbon, not more than 1/2% copper and not more than 1% of all other elements; and said second metal or metal alloy is at least 73% iron alloyed with about 20% chromium, about 21/2% silicon, about 11/2% nickel, about 3/4% carbon, about 1/2% manganese, not more than 0.03% phosphorus, not more than 0.03% sulfur and essentially 0% of all other elements.
Claim 9
Dependent Claim
45 words
A metal article as claimed in claim 7 wherein about 90% of the particles of said metallic powder of said first metal or metal alloy which are sintered under pressure to form said body have particle sizes between about 80 mesh and about 325 mesh.
References Cited (Backward Citations)
GB892770A
Cited
GB1164289A
Cited
GB1161663A
Cited
US3668951A
Cited
US3802852A
Cited
US3863318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |