S13N4 Having high temperature strength and method

Details S13N4 Having high temperature strength and method S13N4 Having high temperature strength and method

1978-06-15

1981-07-28

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

156735, C04B 3550, C04B 3558

Patent

active

042808502

ABSTRACT:
Polycrystalline ceramic bodies of Si.sub.3 N.sub.4 when prepared to obtain an intergranular phase which is substantially crystalline, exhibits significantly improved mechanical strength at elevated temperatures above 1,000.degree. C. up to 1600.degree. C. over bodies having glass-containing intergranular phases.

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patent: 4025351 (1977-05-01), Masaki
patent: 4039340 (1977-08-01), Weaver
patent: 4046580 (1977-09-01), Ishuet al.
patent: 4066468 (1978-01-01), Kamigaito
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4102698 (1978-07-01), Lange et al.
patent: 4113830 (1978-09-01), Magdiyasni et al.
Lange FF. et al "Phase Relations and Stability Studies in the Si.sub.3 N.sub.4 --SiO.sub.2 --Y.sub.2 O.sub.3 Pseudoternary Sytem" JACS vol. 60 No. 5-6 May-Jun. 1977 pp. 249-252.
Tsuge et al. "Effect of Crystallizing the Brain Boundary Glass Phase . . . Hot Pressed Si.sub.3 N.sub.4 Containing Y.sub.2 O.sub.3 ", J. Am. Ceramic Soc. vol. 58 No. 7-8, pp. 323-326 (Jul., Aug. 1975).
Smith, J. T., "Temperature and Compositional Stability of a Y.sub.6 Si.sub.6 O.sub.2 , Phase in Oxidized Si.sub.3 N.sub.4 ", J. Am. Ceramic Soc. Sep.-Oct. 1977 pp. 465-466.

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