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Polycrystalline cubic boron nitride composite sheet and preparation method and application thereof

A cubic boron nitride and polycrystalline cubic technology, applied in the field of polycrystalline cubic boron nitride composite sheet and its preparation, can solve the problems of poor hardness and strength, unsuitable PCBN, easy chipping and damage, etc.

Active Publication Date: 2020-09-08
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional vitrified bonds commonly used in the prior art include Al 2 o 3 , TiN and TiC have good high-temperature mechanical properties and thermal conductivity stability. PCBN tools with low CBN content can be used to process hardened steel, but PCBN made of traditional vitrified binders has poor hardness and strength at room temperature. , the technical defect of easy chipping and damage, not suitable for the preparation of PCBN with high CBN content

Method used

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  • Polycrystalline cubic boron nitride composite sheet and preparation method and application thereof
  • Polycrystalline cubic boron nitride composite sheet and preparation method and application thereof

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[0029] The present invention also provides a method for preparing the polycrystalline cubic boron nitride composite sheet described in the above technical solution, comprising the following steps:

[0030] Mix tungsten-titanium solid solution, nano-alumina, sintering aid and cubic boron nitride to obtain a mixed material;

[0031] The mixed material is sequentially subjected to vacuum heat treatment and high temperature and high pressure sintering to obtain the polycrystalline cubic boron nitride composite sheet.

[0032] The invention mixes tungsten-titanium solid solution, nano-alumina, sintering aid and cubic boron nitride to obtain a mixed material.

[0033]In the present invention, the mixing order of the tungsten-titanium solid solution, nano-alumina, sintering aid and cubic boron nitride is preferably: first mix the tungsten-titanium solid solution, nano-alumina and sintering aid to obtain the first mixture Afterwards, the first mixture is mixed with cubic boron nitrid...

Embodiment 1

[0042] Configure 70 parts of CBN, 8 parts of nano-alumina, 18 parts of tungsten-titanium solid solution (the mass ratio of tungsten element to titanium element is 1:1) and 4 parts of aluminum nitride;

[0043] Among them, the average particle size of CBN is 1-3 μm; the average particle size of tungsten-titanium solid solution is 4 μm; the average particle size of nano-alumina is 200 nm; the average particle size of aluminum nitride is 2 μm.

[0044] The tungsten-titanium solid solution, nano-alumina and aluminum nitride are ball-milled on a ball mill, and ethanol is added as a dispersion medium. The ball-to-material ratio of ball milling is 5:1, and the speed is 300r / min. After ball milling for 4 hours, CBN is added, and the speed is 200r / min. After ball milling for 4 hours, dry at 80°C for 12 hours, and pass through a 100-mesh sieve after drying to obtain a mixed material.

[0045] Put the mixed material into a circular metal cup, at a temperature of 1050°C and a vacuum of 10...

Embodiment 2

[0049] Configure 80 parts of CBN, 5 parts of nano-alumina, 13 parts of tungsten-titanium solid solution (the mass ratio of tungsten element to titanium element is 1:1) and 2 parts of aluminum nitride;

[0050] Among them, the average particle size of CBN is 1-3 μm; the average particle size of tungsten-titanium solid solution is 4 μm; the average particle size of nano-alumina is 200 nm; the average particle size of aluminum nitride is 2 μm.

[0051] Mill tungsten-titanium solid solution, nano-alumina and aluminum nitride on a ball mill, add ethanol as a dispersion medium, the ball-to-material ratio of ball milling is 5:1, and the speed is 300r / min. After 4 hours, add CBN, and the speed is 200r / min. After 4 hours, dry at 80°C for 12 hours, and pass through a 100-mesh sieve after drying to obtain a mixed material.

[0052] Put the mixed material into a circular metal cup, at a temperature of 1050°C and a vacuum of 10 -2 Under Pa condition, carry out vacuum treatment to mixed ma...

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Abstract

The invention provides a polycrystalline cubic boron nitride composite sheet and a preparation method and application thereof, and belongs to the technical field of superhard materials. The PCBN is prepared from the following raw materials in parts by mass through high-temperature and high-pressure sintering: 70-90 parts of CBN, 3-8 parts of nano aluminum oxide, 6-18 parts of a tungsten-titanium solid solution and 1-4 parts of a sintering aid, the sintering aid is aluminum nitride or rare earth oxide, wherein the mass ratio of the tungsten element to the titanium element in the tungsten-titanium solid solution is 1: 1. The polycrystalline cubic boron nitride composite sheet has the characteristics of high strength and high hardness.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, in particular to a polycrystalline cubic boron nitride composite sheet and its preparation method and application. Background technique [0002] Polycrystalline cubic boron nitride (PCBN) composite sheet is a polycrystal sintered by cubic boron nitride (CBN) powder and binder under high temperature and high pressure. Polycrystalline cubic boron nitride has the following special properties: (1) high hardness; (2) high wear resistance; (3) high chemical inertness; (4) high thermal stability; (5) high thermal conductivity; (6) low Friction coefficient; (7) High-speed cutting characteristics and high machining accuracy. Since polycrystalline cubic boron nitride has high hardness, high wear resistance, high heat transfer efficiency, and excellent high-temperature performance, it can be considered that polycrystalline cubic boron nitride cutting tools are by far the world's most capable of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831C04B35/5835C04B35/622C04B35/64C04B35/645
CPCC04B35/5831C04B35/622C04B35/64C04B35/645C04B2235/3217C04B2235/3865C04B2235/3843C04B2235/3847C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/5436C04B2235/5445C04B2235/6581C04B2235/661C04B2235/656C04B2235/6567C04B2235/96
Inventor 莫培程陈家荣陈超林峰
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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