Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1987-04-23
1989-03-21
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 12, 501 97, C04B 3558
Patent
active
048141283
ABSTRACT:
A process for making a homogeneous yttria-alumina doped silicon nitride article is described. A uniform coating of yttria and alumina is applied to the surface of silicon nitride particles by a chemical application of the hydroxides of yttrium and aluminum followed by drying and a subsequent conversion of the hydroxides to the corresponding oxides. The resulting powder is formed into an article and pressureless sintered to a density greater than 99% of theoretical.
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Szweda, A. et al, "The Preparation of Silicon Nitride from Silica by Sol-Gel Processing"; Proc. By Ceram. Soc., 1981, 31, No. Spec. Ceram. 7, pp. 107-118.
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Lieberman Sheldon
Su Sophia R.
Trickett Elizabeth
Derrington James
Ericson Ivan L.
GTE Laboratories Incorporated
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