Process for producing silicon nitride sintered products having high toughness
A process for producing a silicon nitride sintered product having high toughness is described, comprising blending from 97 to 57% by weight of metallic silicon powder having a maximum particle size of 25 ..mu..m or less with from 1 to 15% by weight, calculated as TiN, of a TiN powder having a maximum particle size of 20 ..mu..m or less or a powder of titanium component capable of changing into TiN during reaction sintering, and from 2 to 28% by weight of one or more components selected from the group consisting of AlN, Al/sub 2/O/sub 3/, SiO/sub 2/ and oxides of rare earth elements, molding the resulting mixture, carrying out reaction sintering in a nonoxidizing atmosphere of a nitrogen gas or a nitrogen-containing mixed gas, and thereafter resintering in the same atmosphere at a temperature of from 1,600/sup 0/ C. to 2,200/sup 0/ C.
- Assignee:
- NGK Spark Plug Co., Ltd. (Japan)
- Patent Number(s):
- US 4440707
- OSTI ID:
- 6510146
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CORUNDUM
ELEMENTS
FABRICATION
FRACTURE PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MIXING
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
POWDERS
PRODUCTION
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
SINTERED MATERIALS
SINTERING
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE