SURFACE-COATED CUTTING TOOL HAVING RIGID COATING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE

Title:

SURFACE-COATED CUTTING TOOL HAVING RIGID COATING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE

Document Type and Number:

WIPO Patent Application WO/2017/038840

Kind Code:

A1

Abstract:

In a surface-coated cutting tool according to the present invention, a rigid coating layer contains at least a composite-nitride or composite-carbonitride layer represented by compositional formula: (Ti1 － xAlx) (CyN1 － y), wherein the average content ratio xavg of Al and the average content ratio yavg of C (xavg and yavg each represent an atomic ratio) satisfy 0.60 ≤ xavg ≤ 0.95 and 0 ≤ yavg ≤ 0.005. Among crystal grains forming the composite-nitride or composite-carbonitride layer, crystal grains each having a cubic crystal structure exist. When the surface-polishing surface of the layer surface is analyzed from a direction perpendicular to the layer surface: the crystal grains each having a cubic crystal structure have an average in-crystal-grain orientation difference of not less than 1 degree or of not less than 2 degrees; and also, a frequency distribution regarding an average in-crystal-grain orientation difference and the area ratio thereof has the peak in the range in which the average in-crystal-grain orientation difference is not less than 1 degree but less than 2 degrees.

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Inventors:

TATSUOKA SHO (JP)
SATO KENICHI (JP)
YAMAGUCHI KENJI (JP)

Application Number:

PCT/JP2016/075390

Publication Date:

March 09, 2017

Filing Date:

August 31, 2016

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

B23B27/14; C23C16/30; C23C16/34; C23C16/36

Domestic Patent References:

WO2015163391A1	2015-10-29
WO2015182711A1	2015-12-03

Foreign References:

JP2013248675A	2013-12-12
US20100323176A1	2010-12-23

Other References: