Crystalline sialon having wurtzite structure

Details Crystalline sialon having wurtzite structure Crystalline sialon having wurtzite structure

1993-10-12

1995-07-04

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3558

Patent

active

054299985

ABSTRACT:
A crystalline sialon comprising crystals containing aluminum, silicon, nitrogen and oxygen, in which the crystal structure has a hexagonal system wurtzite structure identical with that of AlN crystals, and the volume of the unit cell thereof has a value smaller than that of the AlN crystals. The crystalline sialon can be synthesized by mixing a silicon-containing gas, an aluminum halide, a nitrogen atom-containing gas and an oxygen atom-containing gas, converting the gas mixture into plasmas by microwave discharging and depositing a film on the surface of a substrate, in which the temperature of the substrate, while controlling a flow rate of the silicon-containing gas and a flow rate of the oxygen-containing gas. The crystalline sialon of the present invention has high hardness, is excellent in oxidation resistance, as well as excellent in heat conductivity and adhesion with a superhard substrate.

REFERENCES:
patent: 3991166 (1976-11-01), Jack et al.
patent: 4818635 (1989-04-01), Ekstrom et al.

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