SILICON NITRIDE-BASED SINTERED COMPACT FOR CUTTING TOOL

Title:

SILICON NITRIDE-BASED SINTERED COMPACT FOR CUTTING TOOL

Document Type and Number:

Japanese Patent JP3423329

Kind Code:

B2

Abstract:

PURPOSE: To improve the durability and breaking resistance of a cutting tool made of a silicon nitride-based sintered compact by limiting the heat conductivity of the sintered compact and the increase of the coefft. of stress extension to 50μm length of the rising crack of the R curve of a microcrack.
CONSTITUTION: Silicon nitride particles and a sintering aid such as MgO, ZrO2 or CeO2 are sintered to obtain a silicon nitride-based sintered compact for a cutting tool. The heat conductivity of this sintered compact is regulated to ≥35W/m.k and the increase of the coefft. of stress extension to 50μm length of the rising crack of the R curve of a microcrack is regulated to ≥1MPam0.5. When a cutting tool is made of the resulting sintered compact, it is excellent in resistance to chipping and breaking at the time of rough-cutting a casting.

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Inventors:

Kazuhiro Urashima
You Tashima
Masakazu Watanabe

Application Number:

JP8507192A

Publication Date:

July 07, 2003

Filing Date:

March 09, 1992

Export Citation:

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Assignee:

Nippon Special Ceramics Co., Ltd.

International Classes:

B23B27/14; C04B35/58; C04B35/584; (IPC1-7): C04B35/584; B23B27/14

Domestic Patent References:

JP55109275A
JP1157466A
JP3504959A

Attorney, Agent or Firm:

Asamichi Kato

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