Cubic boron nitride compact

A nitride and carbonitride technology, used in the manufacture of tools, toolholder accessories, turning equipment, etc., can solve problems such as aggravation, limited tool life, and tool failure.

Active Publication Date: 2007-12-05
ELEMENT SIX ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that tools tend to fail catastrophically due to cracking or chipping, which is exacerbated by the increasing demand in the market for higher throughput through increased cutting speeds, whereby tools have a limited tool life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Substoichiometric titanium carbonitride powder (Ti(C 0.3 N 0.7 ) 0.8 ) mixed with Al powder with an average particle size of 5 microns. Ti(C 0.3 N 0.7 ) 0.8 The mass ratio between Al and Al is 90:10. The powders were mixed and pressed into a titanium cup to form a briquette, and heated to 1025° C. for 30 minutes under vacuum and then crushed and ground into a powder. The powder mixture was then sand milled for 4 hours. A CBN powder mixture containing about 30 wt% CBN with an average particle size of 0.7 microns and other CBNs with an average particle size of 2 microns was added to the slurry in an amount to obtain an overall 60% by volume of CBN. The CBN-containing slurry was ground and mixed using a sand mill for 1 hour. The slurry was dried under vacuum and formed into a compact body, and sintered at 55 kbar (5.5 GPa) and about 1300° C. to produce a CBN compact.

Embodiment 2

[0069] Substoichiometric titanium carbonitride powder (Ti(C 0.5 N 0.5 ) 0.8 ) mixed with Al powder with an average particle size of 5 microns. Ti(C 0.5 N 0.5 ) 0.8The mass ratio between Al and Al is 90:10. The powders were mixed and pressed into a titanium cup to form a briquette, and heated to 1025° C. for 30 minutes under vacuum and then crushed and ground into a powder. The powder mixture was then sand milled for 4 hours.

[0070] A CBN powder mixture containing approximately 30 wt% CBN with an average particle size of 0.7 microns and other CBN with an average particle size of 1.4 microns was added to the slurry to obtain an overall 55% by volume of CBN. The CBN-containing slurry was ground and mixed using a sand mill for 1 hour. The slurry was dried under vacuum and formed into a compact body, and sintered at 55 kbar (5.5 GPa) and about 1300° C. to produce a CBN compact.

Embodiment 3

[0083] Using a tubular mixer, mix substoichiometric titanium carbonitride TiN with an average particle size of 1.4 μm 0.7 Mixed with Al powder with an average particle size of 5 microns. TiN 0.7 The mass ratio between Al and Al is 90:10. The powders were mixed and pressed into a titanium cup to form a briquette, and heated to 1025° C. for 30 minutes under vacuum and then crushed and ground into a powder.

[0084] The powder mixture was then sand milled for 4 hours. A CBN powder mixture containing about 30 wt% CBN with an average particle size of 0.7 microns and other CBNs with an average particle size of 2 microns was added to the slurry in an amount to obtain an overall 60% by volume of CBN. The mixture was sand milled in hexane for 1 hour with the addition of CBN. The slurry was dried under vacuum and formed into a compact body, and sintered at 55 kbar (5.5 GPa) and about 1300° C. to produce a CBN compact.

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Abstract

The present invention relates to CBN briquetting which contains CBN and matrix phase, the matrix phase combines with a second horniness phase and maximum titanium diboride, thereinto, the second horniness phase is selected from TiCN, TiC, TiN or its mixture and solid solution, the XRD peak height of thetitanium diboride peak (101)(after back ground emendation) is below 12 percent of the CBN peak (111) height.

Description

Background of the invention [0001] The present invention relates to compositions for making cubic boron nitride abrasive compacts, and in particular to compacts having enhanced wear resistance and enhanced chipping resistance. [0002] Boron nitride generally exists in three crystal forms, namely cubic boron nitride (CBN), hexagonal boron nitride (hBN) and wurtzitic cubic boron nitride (wBN). Cubic boron nitride is a hard sphalerite form of boron nitride that is structurally similar to diamond. In the CBN structure, the bonds formed between atoms are strong, mainly covalent tetrahedral bonds. Methods of preparing CBN are well known in the art. One approach is to subject hBN to extremely high pressure and temperature in the presence of specific catalytic additive materials, which may include alkali metals, alkaline earth metals, lead, tin, and nitrides of these metals. When the temperature and pressure are reduced, CBN can be recovered. [0003] CBN has a wide range of comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831B23B27/14
Inventor N・卡恩S・A・安德森
Owner ELEMENT SIX ABRASIVES
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