Composition useful for preparation of dense neodymium...

Details Composition useful for preparation of dense neodymium... Composition useful for preparation of dense neodymium...

2006-10-31

2006-10-31

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S097400, C501S098200, C501S098300

Reexamination Certificate

active

07129191

ABSTRACT:
The present invention consists of a synergistic mixture of Si3N4, Al2O3, AlN, SiO2and Nd2O3. The cost effective synergistic composition is useful for the preparation of dense neodymium stabilised β-Si3N4-α-SiAlON composite of the order of >98% theoretical density, having high hardness and high fracture toughness. The dense β-Si3N4-α-SiAlON composite will be useful for low temperature applications as wear parts like bearing and roller materials and particularly for grinding and milling operations like grinding balls.

REFERENCES:
patent: 4421528 (1983-12-01), Buljan et al.
patent: 5032553 (1991-07-01), Tarry
patent: 5413972 (1995-05-01), Hwang et al.
patent: 5908798 (1999-06-01), Chen et al.
patent: 6824727 (2004-11-01), Roy et al.

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