EP0176315A2
Expired / Lapsed
EP
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Sliding member of high strength and high abrasion resistance
Assignee: Toshiba Corp
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Filing: 1985-09-18
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Granted: —
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Expires: 2005-09-18
Abstract
Abstract A sliding member formed of sintered silicon nitride shows improvement in strength and abrasion resistance when substantially all the ε -phase type fine silicon nitride particles (1) present as a main component in the sintered silicon nitride have major diameters not exceeding 60 µm and aspect ratios of not less than 5 and the aforementioned fine silicon nitride particles (1) have tightness of not less than 98%.
Inventors
- 👤 Katsutoshi C/O Patent Division Komeya
- 👤 Masahiro C/O Patent Division Hashimoto
- 👤 Katsutoshi C/O Patent Division Nishida
- 👤 Michiyasu C/O Patent Division Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:40
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/16; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A sliding member of high strength and high abrasion resistance, preponderantly comprising a -phase type fine silicon nitride particles of the form of long sticks and containing not more than 20% by weight, based on the total amount of said sliding member, of a grain boundary phase enveloping said fine silicon nitride particles, substantially all of said fine silicon nitride particles possessing aspect ratios of not less than 5, said sliding member having tightness of not less than 98%.
Claim 2
Dependent Claim
79 words
A sliding member of high strength and high abrasion resistance, preponderantly comprising a -phase type fine silicon nitride particles of the form of long sticks and containing not more than 20% by weight, based on the total amount of said sliding member, of a grain boundary phase enveloping said fine silicon nitride particles, substantially all of said fine silicon nitride particles possessing aspect ratios of not less than 5, said sliding member having tightness of not less than 98%.
Claim 3
Dependent Claim
137 words
A sliding member of high strength and high abrasion resistance, formed by mixing not more than 10% by weight of the oxide of a rare earth element, not more than 10% by weight of aluminum oxide, not more than 10% by weight of aluminum nitride, and not more than 5% by weight of at least one member selected from titanium oxide, zirconium oxide or magnesium oxide, (excluding the case wherein both said oxide of rare earth element and aluminum oxide both account for 0% by weight) with silicon nitride power in proportions such that the ratio of said oxide of rare earth element to aluminum oxide will fall in the range of 0.5 to 10, and sintering the resultant mixture in an atmosphere of inert gas at a temperature in the range of 1,650° to 1,850° C.
Claim 4
Dependent Claim
137 words
A sliding member of high strength and high abrasion resistance, formed by mixing not more than 10% by weight of the oxide of a rare earth element, not more than 10% by weight of aluminum oxide, not more than 10% by weight of aluminum nitride, and not more than 5% by weight of at least one member selected from titanium oxide, zirconium oxide or magnesium oxide, (excluding the case wherein both said oxide of rare earth element and aluminum oxide both account for 0% by weight) with silicon nitride power in proportions such that the ratio of said oxide of rare earth element to aluminum oxide will fall in the range of 0.5 to 10, and sintering the resultant mixture in an atmosphere of inert gas at a temperature in the range of 1,650° to 1,850° C.
Claim 5
Dependent Claim
17 words
A sliding member according to Claim 2, wherein said oxide of rare earth element is yttrium oxide.
Claim 6
Dependent Claim
43 words
A sliding member according to Claim 2, wherein the total amount of said oxide of rare earth element with aluminum oxide to be added falls in the range of 3 to 15 % by weight based on the total amount of starting material.
Claim 7
Dependent Claim
38 words
A sliding member according to Claim 2, wherein the total amount of aluminum nitride with aluminum oxide to be added falls in the range of 2 to 15% by weight based on the total amount of starting material.
Claim 8
Dependent Claim
40 words
A sliding member according to Claim 2, wherein the total amount of titanium oxide, zirconium oxide and magnesium oxide, to be added falls in the range of 0.05 to 3% by weight based on the toal amount of starting material.
References Cited (Backward Citations)
No citation records indexed.
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