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Cubic boron nitride compact

A technology of powder and composition, which is applied in the field of preparation of powder composition, and can solve problems such as tool failure, aggravation, and limited tool life

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

[0049] TiC 0.8 Mixed with Al powder, of which TiC 0.8 The weight ratio to Al powder is 90:10. The powder mixture was heated to 1025°C under vacuum for 30 minutes, and then crushed and made into powder. The powder mixture was pulverized with a hexane sand mill for 4 hours. Keep the solid / liquid ratio at 14.3% by volume. CBN powder with an average particle size of 1.2 microns was added in a ratio such that 50% by volume of CBN was obtained in the mixture, and then the mixture was sand-milled and pulverized for 1 hour. Keep the solid / liquid volume ratio at 20% by volume. After sand milling, the slurry is dried under vacuum and formed into briquettes.

[0050] The ground powder contained about 2.01 wt% tungsten carbide from sand milling, which was measured by the weight difference of the grinding media before and after sand milling.

[0051] The material was sintered at 55 kbar and 1300°C to prepare a CBN compact. The X-ray analysis of the CBN compact showed the FWHM peak broadening e...

Embodiment 2

[0063] Put Ti(C 0.5 N 0.5 ) 0.8 Mixed with Al powder, where Ti(C 0.5 N 0.5 ) 0.8 The weight ratio to Al powder is 90:10. The powder mixture was heated to 1025°C under vacuum for 30 minutes, and then crushed and made into powder. The powdery mixture was pulverized with a hexane sand mill for 4 hours. Keep the solid / liquid ratio at 15.3% by volume. CBN powder with an average particle size of 0.7 microns was added in a ratio such that 50% by volume of CBN was obtained in the mixture, and then the mixture was sand-milled and pulverized for 1 hour. Keep the solid / liquid volume ratio at 18.3% by volume. After sand milling, the slurry is dried under vacuum and formed into briquettes.

[0064] The ground powder contained about 1.1 wt% tungsten carbide from sand milling, which was measured by the weight difference of the grinding media before and after sand milling.

[0065]The material was sintered at 55 kbar and 1300°C to produce CBN compacts. The X-ray analysis of the CBN compact showed...

Embodiment 3

[0081] The substoichiometric titanium carbonitride powder with an average particle size of 1.4 microns (Ti(C 0.3 N 0.7 ) 0.8 ) Is mixed with Al powder with an average particle size of 5 microns. Ti(C 0.3 N 0.7 ) 0.8 The mass ratio to Al is 90:10. The powder was mixed and pressed into a titanium cup to form a compact, and heated to 1025° C. for 30 minutes under vacuum and then crushed and ground into powder. The powder mixture was subsequently sand-milled for 4 hours. In the first stage of grinding, the solid / liquid ratio was maintained at 15.1% by volume. A CBN powder mixture containing about 30% by weight of CBN with an average particle size of 0.7 microns and other CBN with an average particle size of 2 microns was added to the slurry in a certain amount to obtain a total CBN of 60% by volume. Grind and mix the CBN-containing slurry by sand milling for 1 hour. In the second stage of grinding, the solid / liquid ratio was maintained at 18.3% by volume. The slurry was dried under va...

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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 the preparation of a powdery composition suitable for manufacturing cubic boron nitride abrasive compacts, in particular to compacts with enhanced abrasion resistance and enhanced chipping resistance. [0002] Boron nitride usually 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 zinc blende form of boron nitride with a structure similar to diamond. In the CBN structure, the bonds formed between atoms are strong, mainly covalent tetrahedral bonds. The method of preparing CBN is 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 decrease, CBN can be recovered. [0003]...

Claims

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Application Information

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IPC IPC(8): C04B35/5831C22C1/10B22F9/04B23B27/14
Inventor N・卡恩S・A・安德森R・弗里斯I・P・古德蒙德
Owner ELEMENT SIX ABRASIVES
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