Accession Number:

ADD002197

Title:

Hot Pressed, High Strength Silicon Nitride.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s):

• Gazza,George E.

Report Date:

1974-08-20

Pagination or Media Count:

3.0

Abstract:

The patent relates to the fabrication of high strength, high density, silicon nitride by the addition of between 1.0 to 3.5 percent by weight of yttrium in the form of a compound to silicon nitride powder and pressing the material at temperatures of between 1,750C. and 1,800C. and at uniaxial pressures of between 6,000 and 7,000 psi.

Descriptors:

• *Silicon nitrides
• *Patents
• Additives
• Yttrium
• Hot pressing

Subject Categories:

• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE