US4249913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina coated silicon carbide abrasive
Assignee: RTX Corp
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Filing: 1979-05-21
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Granted: 1981-02-10
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Expires: 1999-05-21
Abstract
Abstract Disclosed is an improved abrasive material particularly useful as a dispersoid in metal matrices to provide articles of use having superior abrasive properties, especially at elevated temperatures. The improved abrasive material typically comprises silicon carbide particulate, the individual particles of which have a predominantly alumina coating thereon to inhibit dissolution of the particles in the metal matrix at high temperatures. The invention finds special application in abrasive blade tips for service in gas turbine engines, the tips comprising a nickel base or cobalt base superalloy having the alumina coated silicon carbide particles dispersed therein.
Inventors
- 👤 Gerard F. Johnson
- 👤 Peter W. Schilke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:17
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
A high temperature particulate, useful as an improved dispersoid in a metal matrix, comprising silicon carbide particulates having a predominantly alumina coating, the coating being resistive to diffusion or dissolution in superalloys at temperatures of 2000° F. or more.
Claim 2
Dependent Claim
39 words
A high temperature particulate, useful as an improved dispersoid in a metal matrix, comprising silicon carbide particulates having a predominantly alumina coating, the coating being resistive to diffusion or dissolution in superalloys at temperatures of 2000° F. or more.
Claim 3
Dependent Claim
46 words
A material for high temperature wear and rubbing resistance, comprising, a high temperature superalloy matrix having silicon carbide particles dispersed therein, the particles having a predominantly alumina coating, wherein the alumina coating is resistive to diffusion or dissolution in superalloys at temperatures of about 2000° F.
Claim 4
Dependent Claim
46 words
A material for high temperature wear and rubbing resistance, comprising, a high temperature superalloy matrix having silicon carbide particles dispersed therein, the particles having a predominantly alumina coating, wherein the alumina coating is resistive to diffusion or dissolution in superalloys at temperatures of about 2000° F.
Claim 5
Dependent Claim
64 words
A material for high temperature wear and rubbing resistance comprising a high temperature superalloy matrix having silicon carbide particles dispersed therein, the particles having a first coating to improve bonding and a second coating of predominately alumina to resist diffusion or dissolution in superalloys at temperatures of about 2000° F., wherein the first coating is selected from the group consisting of silica and mullite.
Claim 6
Dependent Claim
64 words
A material for high temperature wear and rubbing resistance comprising a high temperature superalloy matrix having silicon carbide particles dispersed therein, the particles having a first coating to improve bonding and a second coating of predominately alumina to resist diffusion or dissolution in superalloys at temperatures of about 2000° F., wherein the first coating is selected from the group consisting of silica and mullite.
Claim 7
Dependent Claim
60 words
A high temperature particulate material useful as an improved dispersoid in a metal matrix, comprising silicon carbide particulates having a first coating to improve bonding and a second coating of alumina to resist diffusion or dissolution in superalloys at temperatures of 2000° F. or more, wherein the first coating material is selected from the group consisting of silica and mullite.
Claim 8
Dependent Claim
60 words
A high temperature particulate material useful as an improved dispersoid in a metal matrix, comprising silicon carbide particulates having a first coating to improve bonding and a second coating of alumina to resist diffusion or dissolution in superalloys at temperatures of 2000° F. or more, wherein the first coating material is selected from the group consisting of silica and mullite.
Claim 9
Dependent Claim
17 words
The abrasive material of claim 1 wherein the thickness of the alumina coating is about 0.1 mil.
Claim 10
Dependent Claim
60 words
In the method for making a silicon carbide and metal matrix abrasive article useful at elevated temperatures, the improvement comprising, depositing an alumina coating on individual silicon carbide particles and dispersing the coated particles in a metal matrix, the alumina coating inhibiting diffusion of the particles into the matrix at elevated temperatures and increasing the useful life of the article.
Claim 11
Dependent Claim
60 words
In the method for making a silicon carbide and metal matrix abrasive article useful at elevated temperatures, the improvement comprising, depositing an alumina coating on individual silicon carbide particles and dispersing the coated particles in a metal matrix, the alumina coating inhibiting diffusion of the particles into the matrix at elevated temperatures and increasing the useful life of the article.
Claim 12
Dependent Claim
36 words
The method of claim 6 wherein the coated particles are dispersed in the metal matrix by powder metallurgical techniques including mixing the coated particles with metal powder and then pressing the mixture into a consolidated body.
Claim 13
Independent Claim
40 words
The method of improving the durability of high temperature silicon carbide particulate-containing metal which comprises coating the silicon carbide particulates, prior to inclusion within the metal, with at least one material selected from the group consisting of alumina, silica, mullite.
Claim 14
Independent Claim
40 words
The method of improving the durability of high temperature silicon carbide particulate-containing metal which comprises coating the silicon carbide particulates, prior to inclusion within the metal, with at least one material selected from the group consisting of alumina, silica, mullite.
Claim 15
Dependent Claim
50 words
An abrasive blade tip for a gas turbine engine blade comprised of a superalloy having silicon carbide particulate of an average particle dimension of from 8 to 30 mils, the particulate having an alumina coating, the coating being resistive to diffusion into the superalloy at temperatures of about 2000° F.
Claim 16
Dependent Claim
50 words
An abrasive blade tip for a gas turbine engine blade comprised of a superalloy having silicon carbide particulate of an average particle dimension of from 8 to 30 mils, the particulate having an alumina coating, the coating being resistive to diffusion into the superalloy at temperatures of about 2000° F.
Claim 17
Dependent Claim
16 words
A composite gas turbine blade made of a superalloy, having a tip according to claim 9.
References Cited (Backward Citations)
US3508890A
Cited
US3779726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |