Alumina coated silicon nitride cutting tools

Patent · Tue Apr 03 00:00:00 EST 1984

OSTI ID:6421143

Sarin, V K; Buljan, St

Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of aluminum oxide. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.

• Assignee: GTE Laboratories Incorporated
• Patent Number(s): US 4440547
• Application Number: TRN: 84-022928
• OSTI ID: 6421143
• Resource Relation: Patent File Date: Filed date 20 May 1982; Other Information: PAT-APPL-380363
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
WEAR RESISTANCE
CUTTING TOOLS
COATINGS
SILICON NITRIDES
CHEMICAL COMPOSITION
HAFNIUM OXIDES
LANTHANUM OXIDES
MAGNESIUM OXIDES
REFRACTORIES
SILICON OXIDES
SUBSTRATES
TEMPERATURE EFFECTS
YTTRIUM OXIDES
ZIRCONIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
HAFNIUM COMPOUNDS
LANTHANUM COMPOUNDS
MAGNESIUM COMPOUNDS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SILICON COMPOUNDS
TOOLS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication