Sintered compact and cutting tool

Patent metadata

Field	Value
Publication number	US-9856175-B2
Application number	US-201615324182-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	May 29, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A sintered compact according to the present invention includes: a first material that is cubic boron nitride; a second material that is an oxide of zirconium; and a third material that is an oxide of aluminum, the second material including cubic ZrO 2 and ZrO, the third material including α-Al 2 O 3 , and the sintered compact satisfying the following relation:

0.9≦ I zro2 (111)/ I al (110)≦30; and

0.3≦ I zro (111)/ I al (110)≦3,

where I al (110), I zro2 (111), and I zro (111) respectively represent X-ray diffraction intensities of a (110) plane of the α-Al 2 O 3 , a (111) plane of the cubic ZrO 2 , and a (111) plane of the ZrO.

First claim

The invention claimed is:

1. A sintered compact comprising:
a first material that is cubic boron nitride;
a second material that is an oxide of zirconium; and
a third material that is an oxide of aluminum,
the second material including cubic ZrO 2 and ZrO,
the third material including α-Al 2 O 3 ,
the sintered compact satisfying the following relation:
0.9≦ I zro2 (111)/ I al (110)≦30; and

0.3≦ I zro (111)/ I al (110)≦3,

where I al (110), I zro2 (111), and I zro (111) respectively represent X-ray diffraction intensities of a (110) plane of the α-Al 2 O 3 , a (111) plane of the cubic ZrO 2 , and a (111) plane of the ZrO.

2. The sintered compact according to claim 1 , wherein
the I al (110), the I zro2 (111) and the I zro (111) satisfy the following relations:
1.1≦ I zro2 (111)/ I al (110)≦10; and

1≦ I zro (111)/ I al (110)≦2.5.

3. The sintered compact according to claim 1 , wherein the cubic ZrO 2 includes partially stabilized ZrO 2 .

4. The sintered compact according to claim 1 , wherein the cubic ZrO 2 has Al 2 O 3 and Y 2 O 3 dissolved in a solid state.

5. The sintered compact according to claim 1 , wherein the sintered compact includes 20 volume % to 80 volume % of the first material.

6. The sintered compact according to claim 1 , wherein the sintered compact includes 30 volume % to 60 volume % of the first material.

7. The sintered compact according to claim 1 , further comprising a fourth material, wherein
the fourth material is at least one selected from a group consisting of magnesium oxide, cerium oxide, yttrium oxide, and hafnium oxide.

8. The sintered compact according to claim 1 , further comprising a fifth material, wherein
the fifth material is at least one compound composed of (i) at least one element selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, Al, and Si, and (ii) at least one element selected from a group consisting of carbon, nitrogen, and boron.

9. A cutting tool comprising the sintered compact recited in claim 1 .

Assignees

• Sumitomo Electric Hardmetal Corp
• Sumitomo Electric Industries

Inventors

• Okamura Katsumi
• Danda Mayu
• Kukino Satoru

Classifications

• C04B2235/3873

  Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride · CPC title

• B23B2224/04

  Aluminium oxide · CPC title

• C04B2235/3246

  Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia · CPC title

• C04B2235/3886

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

• B23C5/16

  characterised by physical features other than shape · CPC title