Sialon-based sintered body and process for producing same

Details Sialon-based sintered body and process for producing same Sialon-based sintered body and process for producing same

1991-04-05

1993-04-06

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, C04B 3558

Patent

active

052003744

ABSTRACT:
A SiAlON-based sintered body having a high mechanical strength and fracture toughness, as well as an excellent oxidation resistance, is provided. The SiAlON-based sintered body comprises 5 to 50% by weight of a first crystal phase of RE.alpha.-SiAlON represented by RE.sub.x (Si, Al).sub.12 (O, N).sub.16, where RE stands for at least one modifying rare earth element selected from the group consisting of Ho, Er, Tm, Yb and Lu and x has a value of 0<x.ltoreq.2, 30 to 90% by weight of a second crystal phase of .beta.-SiAlON represented by Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (0<z.ltoreq.4.2), and 1 to 50% by weight of a third crystal phase containing at least one rare earth element RE selected from the group consisting of Ho, Er, Tm, Yb and Lu, optionally together with 1 to 20% by weight of a crystal phase of .alpha.-silicon nitride.

REFERENCES:
patent: 4506020 (1985-03-01), Butler et al.
patent: 4547470 (1985-10-01), Tanase et al.
patent: 4563433 (1986-01-01), Yeckley et al.
patent: 4818635 (1989-04-01), Ekstrom et al.
patent: 5032553 (1991-07-01), Tarry

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