Transient liquid phase reactive sintering of aluminum...

Details Transient liquid phase reactive sintering of aluminum... Transient liquid phase reactive sintering of aluminum...

2006-05-16

2006-05-16

Walls, Dionne A. (Department: 1731)

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

C264S001100, C423S266000, C423S385000

Reexamination Certificate

active

07045091

ABSTRACT:
A transparent aluminum oxynitride product is produced by a first heat treating step wherein a combination of Al2O3and AlN at a temperature within the solid-liquid phase and a second step of sintering the heat treated combination at a temperature at least 50° C. less than the heat treating temperature. The method introduces a small fraction of liquid that aids in pore elimination and densification. In a single step, the material is shifted from the liquid/solid region into a solid AlON solution region, wherein the liquid is fully reacted with the solid AlON phase, with further sintering occurring. The procedure is sufficient to eliminate voids and other imperfections which often result in a reduction in optical clarity.

REFERENCES:
patent: 4241000 (1980-12-01), McCauley et al.
patent: 4720362 (1988-01-01), Gentilman et al.
patent: 5231062 (1993-07-01), Mathers et al.
patent: 5705450 (1998-01-01), Chiao

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