Silicon nitride powder compacts and sintered bodies

Journal Article · Sun Oct 31 23:00:00 EST 1993 · American Ceramic Society Bulletin; (United States)

OSTI ID:5608129

Isozaki, Kei; Ogawa, Mitsushige ^[1]

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1. Omuta Plant, Fukuoka (Japan). Research and Development Div.

The inhomogeneous structure of silicon nitride powder compacts causes cracks and strains during sintering, and this influences the mechanical properties of the sintered bodies. It is important to be able to evaluate nondestructively the green state inhomogeneous structure to achieve more reliable sintered results. In this research, the quantitative analysis of structural inhomogeneities of silicon nitride powder compacts and sintered bodies in studied by a radiation nondestructive inspection method that uses hard X-rays. The inhomogeneous structure of uniaxially pressed powder compacts was improved by cold isostatic pressing under high pressure. The highest mechanical strength and Weibull modulus were obtained in the sintered body which was prepared from the homogeneous compact with the highest green density.

• OSTI ID: 5608129
• Journal Information: American Ceramic Society Bulletin; (United States), Journal Name: American Ceramic Society Bulletin; (United States) Vol. 72:11; ISSN 0002-7812; ISSN ACSBA7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CHEMICAL ANALYSIS
DENSITY
FABRICATION
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NONDESTRUCTIVE ANALYSIS
PHYSICAL PROPERTIES
PNICTIDES
POWDERS
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING