Preparation method of polycrystal cubic boron nitride sintering body material

A polycrystalline cubic boron nitride technology, which is applied in the field of preparation of polycrystalline cubic boron nitride (PcBN) sintered body materials, can solve the problem of insufficient consideration of polycrystalline cubic boron nitride sintered body mixture, preparation difficulty and cost, and Quality control and other issues to achieve the effect of improving uniformity and yield, improving quality and low thermal stability

Inactive Publication Date: 2017-08-29
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The above patents only start from the perspective of enhancing toughness, and do not fully consider the cost and quality control of polycrystalline cubic boron nitride sintered body mixing, preparation difficulties and ultra-high temperature and high pressure.

Method used

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  • Preparation method of polycrystal cubic boron nitride sintering body material
  • Preparation method of polycrystal cubic boron nitride sintering body material
  • Preparation method of polycrystal cubic boron nitride sintering body material

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Embodiment 1

[0036] The preparation method of the polycrystalline cubic boron nitride sintered body material in this embodiment is as follows:

[0037] Select the mass fraction ratio of binder metal powder and titanium carbide, tungsten carbide, and titanium nitride to the raw material powder to be 40%, wherein the mass ratio of carbide or nitride is 9.5:1, and the content of cobalt powder is not greater than the total mass fraction 4%, the content of aluminum powder is not more than 6% of the total mass fraction, the particle size of the metal powder is 0.1-3 microns; the cubic boron nitride powder with a particle size of 35 microns is crushed into particles with a particle size of 0-7 microns as the raw material , the mass fraction ratio of cubic boron nitride micropowder to raw material micropowder is 60%. The above-mentioned raw material powders are respectively subjected to chemical acid-base treatment and physical vacuum treatment to remove oxygen, water and other impurities from the...

Embodiment 2

[0042] The preparation method of the polycrystalline cubic boron nitride sintered body material in this embodiment is as follows:

[0043] Select binder metal powder and tungsten carbide, titanium carbide, titanium carbide nitrogen to account for 20% of the mass fraction ratio of the raw material powder, wherein the mass ratio of tungsten carbide, titanium carbide, titanium carbide nitrogen carbide is 2:2:1, the titanium powder The content is not more than 3% of the total mass, the content of aluminum powder is not more than 7% of the total mass fraction, the particle size of the metal powder is 0.1-3.5 microns; the cubic boron nitride powder with a particle size of 35 microns is crushed into a particle size of 0-7 Micron particles are used as the raw material, and the mass fraction ratio of cubic boron nitride powder to the raw material powder is 80%. Oxygen, water and other impurities in the raw materials are removed through chemical acid-base treatment and physical vacuum t...

Embodiment 3

[0048] The preparation method of the polycrystalline cubic boron nitride sintered body material in this embodiment is as follows:

[0049] (1) The raw materials of cubic boron nitride micropowder, aluminum powder, silicon nitride and titanium carbide are respectively subjected to chemical acid-base treatment and physical vacuum treatment to remove oxygen, water and impurities in the raw materials;

[0050] (2) Mix the aluminum powder, silicon nitride and titanium carbide processed in step (1) and melt at a high temperature of 1000°C, then crush and classify the smelted product to obtain a composite binder; in the composite binder, silicon nitride and The mass fraction of titanium carbide is 10%, and the mass ratio of silicon nitride to titanium carbide is 5:1;

[0051] (3) Mix the cubic boron nitride micropowder treated in step (1) with the composite binder obtained in step (2) and then ball mill. The mass ratio of cubic boron nitride micropowder to composite binder is 5:5. Af...

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Abstract

The invention provides a preparation method of a polycrystal cubic boron nitride sintering body material, which comprises the steps of preparing a new composite binding agent from metal powder, carbide and/or nitride, mixing and ball-milling cubic boron nitride micropowder and the composite binding agent, breaking cubic boron nitride into 0-7 micrometres micro-nano mixed powder under a protective atmosphere, and performing compression molding at last. According to the method, ingredients in the binding agent are subjected to mutual diffusion, permeation and solid solution form the homogeneous composite binding agent by high-temperature smelting; the composite binding agent can reduce temperature and pressure required by synthesis of polycrystal cubic boron nitride (PcBN) and improve comprehensive performance of polycrystal cubic boron nitride; by taking measures, a dense oxidation layer film on a single crystal surface of cubic boron nitride (CBN) is destroyed to facilitate bonding between CBN and CBN to form high strength polycrystal cubic boron nitride; many CBN surfaces free from oxidation films are generated at the same time.

Description

technical field [0001] The invention provides a method for preparing a polycrystalline cubic boron nitride (PcBN) sintered body material, which relates to the technical field of preparation of superhard composite cutting tools for cutting and milling, in particular to a polycrystalline cubic boron nitride (PcBN) ) Preparation method of sintered body material. Background technique [0002] Diamond is the hardest material known in the world. Cubic boron nitride (CBN) has a similar diamond structure, and its hardness is second only to diamond. Diamond and cubic boron nitride (collectively referred to as superhard materials). Superhard materials are widely used in sawing tools, grinding tools, drilling tools and cutting tools. [0003] Diamond is easy to oxidize at high temperature, especially has a good affinity with iron-based elements, so it is not suitable for processing ferrous metals with iron-based elements. The thermal stability of cubic boron nitride (CBN) is better t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831
CPCC04B35/5831C04B2235/3813C04B2235/3839C04B2235/3843C04B2235/3847C04B2235/3856C04B2235/3865C04B2235/3873C04B2235/3886C04B2235/402C04B2235/404C04B2235/405C04B2235/96
Inventor 李启泉李新奇张旺玺刘磊赵豆豆
Owner ZHONGYUAN ENGINEERING COLLEGE
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