Sintered cubic boron nitride compact and sintered cubic boron nitride compact tool

Patent metadata

Field	Value
Publication number	US-8962505-B2
Application number	US-201113700041-A
Country	US
Kind code	B2
Filing date	Oct 26, 2011
Priority date	Oct 27, 2010
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

It is an object of the present invention to provide a sintered cBN compact having excellent wear resistance and fracture resistance even in machining centrifugally cast iron having a property of being difficult to machine, and to provide a sintered cBN compact tool. A sintered cBN compact of the present invention contains 20% by volume or more and 65% by volume or less of cBN and, as a binder, 34% by volume or more and less than 80% by volume of Al 2 O 3 , at least one selected from the group consisting of nitrides, carbides, carbonitrides, borides, and boronitrides of Zr and solid solutions thereof (hereinafter, referred to as “X”), and ZrO 2 , the total amount of X and ZrO 2 being 1.0% by volume or more and 6.0% by volume or less, the volume ratio of ZrO 2 to Al 2 O 3 , ZrO 2 /Al 2 O 3 , being 0.010 or more and less than 0.100, in which the ratio I tetragonal ZrO2 (101)/I αAl2O3 (110) is 0.1 or more and 3 or less, where I tetragonal ZrO2 (101) is the intensity of the (101) plane of tetragonal ZrO 2 and I αAl2O3 (110) is the intensity of the (110) plane of αAl 2 O 3 among X-ray diffraction peaks of the sintered cBN compact.

First claim

The invention claimed is:

1. A sintered cBN compact, containing:
20% by volume or more and 65% by volume or less of cBN relative to the whole sintered compact;
as a binder, 34% by volume or more and less than 80% by volume of Al 2 O 3 relative to the whole sintered compact, and ZrC; and
ZrO 2 ,
wherein the total amount of ZrC and ZrO 2 being 1.0% by volume or more and 6.0% by volume or less relative to the whole sintered compact, the volume ratio of ZrO 2 to Al 2 O 3 , ZrO 2 /Al 2 O 3 , being 0.010 or more and less than 0.100;
wherein the ratio I tetragonal ZrO2 (101)/I αAl2O3 (110) is 0.1 or more and 3 or less, where I tetragonal ZrO2 (101) is the intensity of the (101) plane of tetragonal ZrO 2 and I αAl2O3 (110) is the intensity of the (110) plane of αAl 2 O 3 among X-ray diffraction peaks of the sintered cBN compact; and
wherein the content of the ZrC in the sintered cBN compact is 0.1% by volume or more and 3.0% by volume or less.

2. The sintered cBN compact according to claim 1 , wherein the ratio t tetragonal ZrO2 (101)/I αAl2O3 (110) is 0.2 or more and 0.5 or less.

3. A sintered cBN compact tool comprising the sintered cBN compact according to claim 1 at least at an edge portion thereof.

4. A sintered cBN compact tool comprising the sintered cBN compact according to claim 2 at least at an edge portion thereof.

Assignees

• Okamura Katsumi
• Abe Machiko
• Kukino Satoru
• Sumitomo Elec Hardmetal Corp

Inventors

• Okamura Katsumi
• Abe Machiko
• Kukino Satoru

Classifications

• C04B35/119

  with zirconium oxide · CPC title

• C04B2235/765

  Tetragonal symmetry · CPC title

• C04B2235/3856

  Carbonitrides, e.g. titanium carbonitride, zirconium carbonitride · CPC title

• C04B2235/80

  Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title

• C04B2235/3886

  Refractory metal nitrides, e.g. vanadium nitride, tungsten nitride · CPC title