Method of making in-situ toughened alpha prime SiAlon-based ceramics
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0157088
(1998-09-18)
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발명자
/ 주소 |
- Chen I-Wei
- Rosenflanz Anatoly
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출원인 / 주소 |
- The Regents of the University of Michigan
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대리인 / 주소 |
Dobrusin Darden Thennisch & Lorenz PllC
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인용정보 |
피인용 횟수 :
8 인용 특허 :
20 |
초록
▼
A method for making an alpha prime SiAlON-based ceramic article, including the steps of providing an admixture of starting materials and densifying said admixture. The admixture includes: beta silicon nitride; a source of aluminum selected from the group consisting of aluminum nitride, alumina, and
A method for making an alpha prime SiAlON-based ceramic article, including the steps of providing an admixture of starting materials and densifying said admixture. The admixture includes: beta silicon nitride; a source of aluminum selected from the group consisting of aluminum nitride, alumina, and mixtures thereof; at least one oxide compound; and a plurality of alpha prime SiAlON seeds.
대표청구항
▼
[ What is claimed is:] [1.] A method for making an alpha prime SiAlON-based ceramic article, comprising the steps of:a) providing an admixture of starting materials, including:i) beta silicon nitride.ii) a source of aluminum selected from the group consisting of aluminum nitride, alumina, and mixtur
[ What is claimed is:] [1.] A method for making an alpha prime SiAlON-based ceramic article, comprising the steps of:a) providing an admixture of starting materials, including:i) beta silicon nitride.ii) a source of aluminum selected from the group consisting of aluminum nitride, alumina, and mixtures thereof;iii) at least one oxide compound selected from the group consisting of Li.sub.2 O, MgO, CaO, Y.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Tb.sub.2 O.sub.3, Dy.sub.2 O.sub.3,Ho.sub.2 O.sub.3, Fr.sub.2 O.sub.3, Tm.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Lu.sub.2 O.sub.3, and mixtures thereof; andiv) a plurality of alpha prime SiAlON seeds having a seed diameter ranging from about 0.2 micron to about 1 micron, said seeds being present in an amount of about 2 to about 10% by weight of the total starting materials;b) densifying said admixture for forming an article having a first phase of at least about 50% by weight of the final material of an alpha prime SiAlON phase;said ceramic article having an indentation toughness of at least about 5 MPa.multidot.m.sup.1/2 ;said first phase including a plurality of alpha prime SiAlON elongated rod shape grains, wherein said article has a hardness of at least about 19 GPa.
이 특허에 인용된 특허 (20)
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Yeckley Russell L. (Oakham MA) North Bernard (Greensburg PA), Ceramic material and method of manufacture.
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Mehrotra Pankaj K. (Greensburg PA) Swiokla Joyce L. (Export PA) Nixon Robert D. (Greensburg PA), High Z sialon and cutting tools made therefrom and method of using.
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Ishizawa Kenki (Tokyo JPX) Ayuzawa Nobuo (Okayama JPX) Shiranita Akira (Okayama JPX) Takai Masamichi (Bizen JPX), Highly corrosion resistant
a
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