US4830930A
Expired / Lapsed
US
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Surface-refined sintered alloy body and method for making the same
Assignee: Tungaloy Corp
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Filing: 1988-04-07
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Granted: 1989-05-16
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Expires: 2008-04-07
Abstract
Abstract There are disclosed a surface refined sintered alloy body which comprises a hard phase containing at least one selected from the group consissting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase in the surface layer (of from 10 mu m to 500 mu m from the surface of the sintered alloy) is highest at the outermost surface thereof and approaches the concentration of the inner portion, the concentration of the binding phase decreasing from the outermost surface to a point at least 5 mu m from the surface; and a method for making the same by applying decarburization treatment at the surface of the sintered alloy at temperatures within the solid-liquid co-existing region of the binding phase after sintering or in the process of sintering.
Inventors
- 👤 Yasuro Taniguchi
- 👤 Ko Sasaki
- 👤 Mitsuo Ueki
- 👤 Keiichi Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C21; C21D; C21D3/00; C21D3/02; C21D3/04; B; B22; B22F; B22F7/00; B22F7/02; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C23; C23C; C23C30/00; C23C30/005; B22F2998/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12458
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A surface-refined sintered alloy body comprising a surface and an inner portion, said body comprising a hard phase containing at least one selected from the group consisting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase is highest at the outermost surface of the body and approaches the concentration of the inner portion, the concentration of said binding phase decreasing from the surface to a point at least 5 microns from the surface.
Claim 2
Dependent Claim
105 words
A surface-refined sintered alloy body comprising a surface and an inner portion, said body comprising a hard phase containing at least one selected from the group consisting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase is highest at the outermost surface of the body and approaches the concentration of the inner portion, the concentration of said binding phase decreasing from the surface to a point at least 5 microns from the surface.
Claim 3
Dependent Claim
24 words
The surface-refined sintered alloy body according to claim 1, wherein the concentration of the binding phase smoothly approaches the concentration of the inner portion.
Claim 4
Dependent Claim
40 words
The surface-refined sintered alloy body according to claim 1, wherein the concentration of the binding phase takes a minimum value lower than the concentration of the inner portion and then is increased smoothly to the concentration of the inner portion.
Claim 5
Independent Claim
141 words
A method for making a surface-refined sintered alloy body comprising a surface and an inner portion, said body comprising a hard phase containing at least one selected from the group consisting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase is highest at the outermost surface of the body and approaches the concentration of the inner portion, the concentration of said binding phase decreasing from the surface to a point at least 5 μm from the surface, aid method comprising applying decarburization treatment at the surface of said sintered alloy at temperatures within the solid-liquid co-existing region of the binding phase after sintering or in the process of sintering.
Claim 6
Independent Claim
141 words
A method for making a surface-refined sintered alloy body comprising a surface and an inner portion, said body comprising a hard phase containing at least one selected from the group consisting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase is highest at the outermost surface of the body and approaches the concentration of the inner portion, the concentration of said binding phase decreasing from the surface to a point at least 5 μm from the surface, aid method comprising applying decarburization treatment at the surface of said sintered alloy at temperatures within the solid-liquid co-existing region of the binding phase after sintering or in the process of sintering.
Claim 7
Dependent Claim
16 words
A method according to claim 4, wherein the decarburization treatment is applied at a slow speed.
Claim 8
Dependent Claim
16 words
A method according to claim 4, wherein the decarburization treatment is applied at a rapid speed.
Claim 9
Dependent Claim
18 words
A method according to claim 4, wherein a carburizing treatment is performed before application of the decarburization treatment.
Claim 10
Dependent Claim
27 words
A surface-refined sintered alloy body according to claim 1, wherein the concentration of said binding phase varies within a surface layer of from 10 to 500 microns.
Claim 11
Dependent Claim
26 words
A surface-refined sintered alloy body according to claim 1, wherein said sintered body further comprises a hard coating layer on the outermost surface of the body.
Claim 12
Dependent Claim
26 words
A surface-refined sintered alloy body according to claim 2, wherein said sintered body further comprises a hard coating layer on the outermost surface of the body.
Claim 13
Dependent Claim
26 words
A surface-refined sintered alloy body according to claim 3, wherein said sintered body further comprises a hard coating layer on the outermost surface of the body.
Claim 14
Dependent Claim
26 words
A surface-refined sintered alloy body according to claim 8, wherein said sintered body further comprises a hard coating layer on the outermost surface of the body.
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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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |