Preparation and evaluation of sinterable silicon nitride powder by imide decomposition method

Journal Article · Sat May 01 04:00:00 EDT 1993 · American Ceramic Society Bulletin; (United States)

OSTI ID:6486823

Yamada, Tetsuo ^[1]

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1. UBE Industries, Ltd., Yamaguchi (Japan)

A chemical synthesis process for producing high-quality Si[sub 3]N[sub 4] powder was developed by applying an imide decomposition method and well-controlled heat-treatment to the crystallization process. Si[sub 3]N[sub 4] powder produced by this process had superior characteristics, such as high purity, fine particle, high [alpha]-content, and good sinterability. Highly dense Si[sub 3]N[sub 4] ceramics were fabricated by both high-pressure hot-pressing of Si[sub 3]N[sub 4] without additives and pressureless sintering of oxide-doped Si[sub 3]N[sub 4], and their excellent mechanical properties were demonstrated. [alpha]/[beta]-SiAlON ceramics were fabricated by sintering the mixture of [alpha]-Si[sub 3]N[sub 4] and Ln-[alpha]-SiAlON powders (where Ln = Y and lanthanide elements), and the thermomechanical properties of SiAlON-based ceramics were much improved by selecting Tm or Yb as the lanthanide elements.

• OSTI ID: 6486823
• Journal Information: American Ceramic Society Bulletin; (United States), Journal Name: American Ceramic Society Bulletin; (United States) Vol. 72:5; ISSN 0002-7812; ISSN ACSBA7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADDITIVES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CRYSTALLIZATION
DECOMPOSITION
DENSITY
DIAGRAMS
FABRICATION
GRAIN SIZE
HEAT TREATMENTS
HOT PRESSING
IMIDES
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORPHOLOGY
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PNICTIDES
POWDERS
PRESSING
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING
SIZE
SYNTHESIS
TEMPERATURE DEPENDENCE