Process for producing Si.sub.3 N.sub.4 base articles by the cold

Details Process for producing Si.sub.3 N.sub.4 base articles by the cold Process for producing Si.sub.3 N.sub.4 base articles by the cold

1979-11-14

1981-07-28

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

51307, 106 734, 264 65, C04B 3558

Patent

active

042809738

ABSTRACT:
A method of making Si.sub.3 N.sub.4 based cutting tools (and the resulting product) is disclosed. A mixture is formed of three powders: a first powder of at least 75% crystalline Si.sub.3 N.sub.4, a second powder selected from the group Y.sub.2 O.sub.3, MgO, CeO.sub.2 and ZrO.sub.2, and a third powder selected from the group consisting of Al.sub.2 O.sub.3, WC, Wsi.sub.2, W and TiC. The mixture is cold pressed to a density of 50-70% of theoretical and then sintered to full density without the application of pressure.

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Giachello et al., "Sintering of Silicon Hatride in a Powder Bed", J. Mat. Sci., 14 (1979) 2825-2830.

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