Structural silicon nitride materials containing rare earth oxide

Details Structural silicon nitride materials containing rare earth oxide Structural silicon nitride materials containing rare earth oxide

1979-01-04

1980-11-18

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 734, 106 735, C04B 3550, C04B 3558

Patent

active

042343437

ABSTRACT:
A ceramic composition suitable for use as a high-temperature structural material, particularly for use in apparatus exposed to oxidizing atmospheres at temperatures of 400 to 1600.degree. C., is found within the triangular area ABCA of the Si.sub.3 N.sub.4 --SiO.sub.2 --M.sub.2 O.sub.3 ternary diagram depicted in FIG. 1. M is selected from the group of Yb, Dy, Er, Sc, and alloys having Yb, Y, Er, or Dy as one component and Sc, Al, Cr, Ti, (Mg +Zr) or (Ni+Zr) as a second component, said alloy having an effective ionic radius less than 0.89 A.

REFERENCES:
patent: 3969125 (1976-07-01), Komeya
patent: 4046580 (1977-09-01), Ishii et al.
patent: 4102698 (1978-07-01), Lange et al.
patent: 4113830 (1978-09-01), Mazdiyasni et al.
Huseby et al.; "Influence of Various Densifying Additives on Hot Pressed Si.sub.3 N.sub.4 ", Powder Metallurgy International, 6 No. 1, Feb. 1974, pp. 17-19.
Priest et al., "Sintering of Si.sub.3 N.sub.4 Under High Nitrogen Pressure" J. Am. Ceramic Soc. Jan.-Feb., 1977, p. 81.
Mazdiyasni et al., "Consolidation, Microstructure and Mechanical Properties of Si.sub.3 N.sub.4 Doped with Rare Earth Oxides", J. Am. Ceramic Soc., Dec. 1974, pp. 536-537, 57, No. 12.
Bazza; "Hot-Pressed Si.sub.3 N.sub.4," J. Am. Ceramic Soc. 56, No. 12, p. 662.

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