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A kind of binder for polycrystalline cubic boron nitride material synthesis and using method thereof

A cubic boron nitride and polycrystalline cubic technology, which is applied in the field of binders for the synthesis of polycrystalline cubic boron nitride materials, can solve the problems of weak bending strength and fracture toughness, difficult sintering and compactness, and poor high-temperature thermal conductivity. Good wear resistance and the effect of improving sintering conditions

Active Publication Date: 2021-09-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic binders have problems such as poor thermal conductivity at high temperature, difficulty in sintering and densification, and weak flexural strength and fracture toughness.
However, when using a metal binder to work at a higher temperature, the wear resistance of the tool is greatly reduced due to the softening of the metal, resulting in a decrease in red hardness.

Method used

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  • A kind of binder for polycrystalline cubic boron nitride material synthesis and using method thereof
  • A kind of binder for polycrystalline cubic boron nitride material synthesis and using method thereof
  • A kind of binder for polycrystalline cubic boron nitride material synthesis and using method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the molar ratio; Ti:Al:Cr:Nb=48:48:2:2, with intermetallic compound powder.

[0029] Prepare grinding balls and intermetallic compounds according to the ball mill mass ratio of 10:1; prepare cubic boron nitride powder according to the volume ratio of intermetallic compound powder: cubic boron nitride powder=20:80; the material of the grinding balls is stainless steel;

[0030] Add balls and intermetallic compounds into the ball mill for cold air ball milling; the speed of cold air ball milling is 300 rpm, the time is 20 hours, and the temperature of cold air is -30°C; then add the prepared cubic boron nitride powder; at 250 Rotation / min ball milling for 8 hours to obtain a uniformly mixed powder.

[0031] The uniformly mixed powder is first subjected to vacuum treatment below 1000Pa for 8 hours; after the vacuum treatment, it is sintered under high temperature and high pressure environment to obtain polycrystalline cubic boron nitride. The high temperature is 1190°...

Embodiment 2

[0038] Take the molar ratio; Ti:Al:Cr:Nb=43:48:2:7 to make intermetallic compound powder.

[0039] Prepare grinding balls and intermetallic compounds according to the ball mill mass ratio of 10:1; prepare cubic boron nitride powder according to the volume ratio of intermetallic compound powder: cubic boron nitride powder=20:80; the material of the grinding balls is stainless steel;

[0040] Add balls and intermetallic compounds into the ball mill for cold air ball milling; the speed of cold air ball milling is 300 rpm, the time is 20 hours, and the temperature of cold air is -30°C; then add the prepared cubic boron nitride powder; at 250 Rotation / min ball milling for 8 hours to obtain a uniformly mixed powder;

[0041] The uniformly mixed powder is first subjected to vacuum treatment below 1000Pa for 8 hours; after vacuum treatment, it is sintered under high temperature and high pressure environment to obtain polycrystalline cubic boron nitride. The high temperature is 1200°C an...

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Abstract

The invention relates to superhard composite material technology, in particular to a binder for synthesizing polycrystalline cubic boron nitride materials and a method for using the same. The binder is an intermetallic compound; the intermetallic compound contains aluminum, titanium and M; the M is selected from at least one of Cr, Nb, W, Mo, V; and the intermetallic compound The atomic proportion of titanium and aluminum accounts for 90‑95% of the intermetallic compound. The application of the binder is: by volume ratio, binder particles: cubic boron nitride powder = 10-30: 70-90, and the binder particles and cubic boron nitride powder are prepared; after mixing evenly, carry out vacuum Treatment: After vacuum treatment, sintering is carried out under high temperature and high pressure environment to obtain polycrystalline cubic boron nitride. The binder developed by the invention provides a necessary condition for preparing high-performance polycrystalline boron nitride at low temperature. The binder components of the invention are set reasonably, the application process is simple and controllable, the obtained product has excellent performance, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to superhard composite material technology, in particular to a binder for synthesizing polycrystalline cubic boron nitride materials and a method for using the same. Background technique [0002] Cubic boron nitride not only has high hardness, but also has excellent thermal and chemical stability, and will not react with iron-based metals at high temperatures. Since cubic boron nitride is composed of high-strength covalent bonds, it is quite difficult to sinter high-purity cubic boron nitride and is not suitable for industrial production. Therefore, it is prepared by adding a certain amount of binder to cubic boron nitride. Polycrystalline cubic boron nitride for good cutting performance. Therefore, using its high hardness, thermal stability, and chemical inertness to prepare cutting tools and abrasive tools, it is widely used in processing various ferrous materials and alloys, as well as tough and difficult-to-machine materials....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/63C04B35/5831C04B35/622
CPCC04B35/5831C04B35/622C04B35/6303C04B2235/402C04B2235/404C04B2235/656C04B2235/6581C04B2235/96
Inventor 刘咏张伟刘宇熙
Owner CENT SOUTH UNIV
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