Si.sub.3 N.sub.4 Hot-pressed with MgO

Details Si.sub.3 N.sub.4 Hot-pressed with MgO Si.sub.3 N.sub.4 Hot-pressed with MgO

1976-12-29

1978-07-11

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 63, 106 69, 106 735, C04B 3332, C04B 3558

Patent

active

040999793

ABSTRACT:
This invention relates generally to ceramic materials formed from powder, and more particularly to hot-pressed structural materials comprising silicon nitride (Si.sub.3 N.sub.4) wherein the oxygen content is controlled by maintaining the molar ratio of MgO and SiO.sub.2.

REFERENCES:
patent: 3811928 (1974-05-01), Henney et al.
patent: 3836374 (1974-09-01), Richerson
patent: 3992497 (1976-11-01), Terwilliger et al.
patent: 4025351 (1977-05-01), Masaki
Terwilliger, G.R. et al., "Hot-Pressing Behavior of Si.sub.3 N.sub.4 " J. Am. Cer. Soc. 57(1), Jan. 1974, pp. 25-29.
Mitomo, M. et al., "Sintering of Si.sub.3 N.sub.4 "-Cer. Soc. Bull., 55 (3) 1976, p. 313.
Mazdiyasni, K. S. et al., "Synthesis, Characterization and Consolidation of Si.sub.3 N.sub.4 Obtained from Ammonolysis of SiCl.sub.4," J. Am. Cer. Soc., 56 (12), Dec. 1973, pp. 628-633.
Colquhoun, I. et al., "The Determination of Surface Silica and Its Effect on the Hot-Pressing Behavior of Alpha-Silicon Nitride Powder," Proc. of Brit. Cer. Soc., No. 22 (1973), pp. 181-195.
Crandall, W. B. et al., "Preparation and Evaluation of Si-Al-O-N," IIT Research Inst.-Prep. for Aerospace Res. Labs., Jun. 1973, pp. 8-10.
Weston, R. J. et al., "Kinetics of Hot-Pressing of Alpha-Silicon Nitride Powder with Additives," Proc. Brit. Cer. Soc., No. 22 (1973), pp. 197-206.

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