Coated silicon nitride cutting tools

Patent · Tue May 22 00:00:00 EDT 1984

OSTI ID:6213978

Sarin, V K; Buljan, S T

Coated cutting tools and coated 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, intermediate adherent coating layer of a refractory material and an outer adherent coating layer. The intermediate adherent coating layer. The intermediate adherent coating layer has a different chemical composition than the outer adherent coating layer. 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 desification 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 4449989
• OSTI ID: 6213978
• Resource Relation: Patent File Date: Filed date 26 Sep 1983; Other Information: PAT-APPL-536109
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CUTTING TOOLS
MACHINING
SURFACE COATING
COATINGS
DENSITY
SILICON NITRIDES
SUBSTRATES
THICKNESS
WEAR RESISTANCE
DEPOSITION
DIMENSIONS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
TOOLS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication