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High strength and heat resistant refractory compositions
| Details |
Inventors: Weaver, Gerald Q.;
Assignee: Norton Company (Worcester, MA)
Primary Examiner: Poer; J.
Assistant Examiner:
Attorney, Agent or Firm: Loiselle, Jr.; Arthur A.
Silicon nitride based refractory articles with flexural strengths at room temperature of up to 150,000 p.s.i. and at 1375.degree. C of up to about 117,000 p.s.i. result when mixtures of 80 to 98.5% by weight of silicon nitride, 1 to 15% by weight of yttrium oxide, and 0.5 to 10% by weight of thorium oxide are pressure sintered according to conventional methods. |
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DETAILED DESCRIPTION What is claimed is: 1.
A heat resistant high strength refractory composite produced by sintering a mixture consisting essentially of from 80 to 98.
5% by weight of silicon nitride, 1 to 15% by weight of yttrium oxide, and 0.
5 to 10% weight of thorium oxide, with the total oxide present not exceeding about 20%.
2.
The refractory composite of claim 1 wherein said mixture consists essentially of from 86 to 94% by weight of silicon nitride, 3 to 7% by weight of yttrium oxide, and 3 to 7% by weight of thorium oxide.
3.
A high strength refractory composite produced by sintering a mixture of from 80 to 98.
5% by weight of silicon nitride, 1 to 15% by weight of yttrium oxide, and 0.
5 to 5% by weight of thorium oxide, said sintered refractory composite having a density of at least 90% of theoretical density.
4.
A refractory article having high strength at room temperature and at 1375.
degree.
C.
, resulting from the sintering of a mixture consisting essentially of from 84 to 87% by weight of silicon nitride, 12 to 13% by weight of yttrium oxide, and 1.
0 to 3% by weight of thorium oxide, said refractory article having a density of at least 98% of theoretical density, a room temperature strength of at least 100,000 p.
s.
i.
, and a strength at 1375.
degree.
C.
of at least 70,000 p.
s.
i.
, said strengths being cross-bending strengths measured under 3 point loading.
5.
A refractory composition produced by sintering a mixture of from 80 to 98.
5% by weight of silicon nitride, 1 to 15% by weight of yttrium oxide, and 0.
5 to 5% of thorium oxide, said refractory composition having a density at least 65% of theoretical density, and a deviation from linearity substantially less than 26%.
6.
The refractory composition which results from sintering a mixture of 84 to 87% by weight of silicon nitride, 12 to 13% by weight of yttrium oxide, and 1 to 3% by weight of thorium oxide, said refractory composition having a density of at least 98% of theoretical density; a room temperature strength of at least 100,000 p
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