Aluminum nitride sintered body and process for producing the sam

Details Aluminum nitride sintered body and process for producing the sam Aluminum nitride sintered body and process for producing the sam

1993-06-29

1994-05-17

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, 264 65, 264 63, C04B 3558

Patent

active

053127862

ABSTRACT:
An aluminum nitride sintered body characterized by comprising aluminum nitride as the main component, containing a titanium compound, and having a black color, a transmittance of 10% or less with the light having a wavelength in the range of from 500 to 650 nm and a heat conductivity of 120 W/m.multidot.K or more. The sintered body is produced by adding 0.05 to 5% by weight, in terms of Ti, of a titanium compound and a sintering aid compound and, if necessary, a compound capable of forming carbon after being thermally decomposed to an aluminum nitride powder, molding the mixture, heating the molding in vacuo, air or a nitrogen gas, a hydrogen gas or an atmosphere comprising a mixture of these gases until the residual carbon content is reduced to 2.0% by weight or less, and sintering the heat-treated mixture in a nonoxidizing atmosphere containing nitrogen at 1600.degree. C. or above. The titanium compound is Ti.sub.n O.sub.2n-1 or a solid solution comprising Ti.sub.n O.sub.2n-1 and nitrogen partly dissolved therein in the solid solution form wherein n is 1 or more, or a compound represented by the formula TiN.sub.x O.sub. y wherein 0<x<1 and y is 3/2 (1-x).
There is provided an aluminum nitride sintered body wherein both the light shielding property and the heat conductivity are stabilized.

REFERENCES:
patent: 4877760 (1989-10-01), Okuno et al.
patent: 5001089 (1991-03-01), Kasori et al.
patent: 5147832 (1992-09-01), Shimoda et al.

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