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Method for preparing polycrystalline cubic boron nitride

A cubic boron nitride and polycrystalline cubic technology, applied in the field of advanced cutting tools, can solve the problems of high pressure required for forming, high sintering temperature, and complicated equipment, and achieve the effect of low cost, low sintering temperature, and simple equipment

Active Publication Date: 2009-10-21
FUNIK ULTRAHARD MATERIAL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the preparation method of polycrystalline cubic boron nitride PcBN is mainly prepared by hot pressing sintering method under high temperature and high pressure, and it is also reported that the plasma discharge sintering process is used. The existing methods for preparing polycrystalline cubic boron nitride are all Forming and sintering are carried out at the same time, and the pressure required for forming is very high, which is 7-9GP; the sintering temperature is also high, which is 1400-2600°C. In addition, the equipment required for the preparation process is complicated and the cost is high, which limits the polycrystalline material to a certain extent. The use of cubic boron nitride

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  • Method for preparing polycrystalline cubic boron nitride
  • Method for preparing polycrystalline cubic boron nitride
  • Method for preparing polycrystalline cubic boron nitride

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Effect test

Embodiment 1

[0026] The preparation method of polycrystalline cubic boron nitride PcBN of the present invention is as follows: weigh 0.6g Al, 0.3g SiO 2 , 0.15g Al 2 o 3 , 0.06 g H 3 BO 3 , 0.6g Si 3 N 4 , mix it evenly to be the binding agent; then weigh 4.2g cubic boron nitride cBN (see X-ray diffraction diagram figure 1 ), the particle size range is 30-40 μm; the binder and cBN are mixed in a planetary ball mill, the ball-to-material ratio is 2:1, the ball-milling medium is water, the rotating speed is 600 rpm, and the ball-milling time is 4 hours; Put the final mixture into a drying oven at 60°C for drying; take it out and put it in a mortar, add polyvinyl alcohol PVA as an organic binder, mix evenly, and pass through a 100-mesh screen; weigh 0.5g of the mixture, and use a Φ8 mold Forming on a press, the initial pressure is 4MPa, and the pressure holding time is 100 seconds; after the pressure is released, a pressure of 8MPa is applied, and the pressure is held for 100s; after th...

Embodiment 2

[0028] The preparation method of polycrystalline cubic boron nitride PcBN of the present embodiment is as follows: Weigh 1.2g potassium feldspar, 0.42gSi, 0.18g Si 3 N 4 , mix it evenly to get the binding agent; then weigh 4.2g cubic boron nitride cBN (see X-ray diffraction diagram figure 1 ), the particle size range is 22-36 μm; the prepared binder and cBN are mixed in a planetary ball mill, the ball-to-material ratio is 3:1, the ball-milling medium is water, the speed is 600 rpm, and the ball-milling time is 8 hours Put the ball-milled mixture into a drying oven at 60°C for drying; take it out and put it in a mortar, add PVA as a binder, mix evenly, and pass through a 100-mesh screen; weigh 0.5g of the mixture, and use a Φ8 mold in the The press is formed, the initial pressure is 4MPa, and the pressure holding time is 100 seconds; after the pressure is released, a pressure of 8MPa is applied, and the pressure is held for 100s; after the pressure is released, a pressure of 1...

Embodiment 3

[0030] The preparation method of the polycrystalline cubic boron nitride PcBN of the present embodiment is as follows: Weigh 1.2g potassium feldspar, 0.42gSi, 0.18g Si 3 N 4 , and mix it evenly to get the binder; then weigh 4.2g of Ti-plated cBN, the particle size range is 30-40μm; put the binder and cBN in a planetary ball mill and mix them with a ball-to-material ratio of 4:1, and ball mill The medium is water, the rotating speed is 600 rpm, and the ball milling time is 16 hours; put the ball-milled mixture into a drying oven at 60°C for drying; take it out and put it in a mortar, add PVA as a binder, mix evenly, and pass 100-mesh screen; weigh 0.5g of the mixture, use a Φ8 mold to form it in a press, the initial pressure is 4MPa, and the pressure holding time is 100 seconds; after the pressure is released, the pressure is added to 8MPa, and the pressure is held for 100s; then the pressure is released and loaded to 12MPa The pressure of 100s is maintained for 100s; then the...

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Abstract

The invention discloses a method for preparing polycrystalline cubic boron nitride, which comprises the following steps: using cubic boron nitride and a bonding agent as raw materials, mixing the cubic boron nitride and the bonding agent and then ball-milling the mixture, wherein the ball material ratio during the ball milling is (1-4):1, the rotating speed is between 400 and 800 revolutions per minute, and the ball milling time is between 4 and 20 hours; drying the mixed mixture after the ball milling, adding an organic binder into the mixture after drying, mixing the mixture evenly, and screening the mixture through a 100-mesh screen; performing cold compression and forming with the pressure of between 0.8 and 2 GPa; and sintering the formed green body at a sintering temperature of between 1,000 and 1,300 DEG C, and keeping the temperature for 4 to 20 hours so that the finished product is obtained after the sintering. The polycrystalline cubic boron nitride PcBN prepared by the method is gray and is a compact block which has the superior performances of high hardness, high grinding efficiency, good impact resistance toughness, easy conditioning, good grinding quality and the like. The method has the advantages of simple equipment, easily-controlled operation, low cost and easy large-scale production, has favorable social value and economic value, and is easy to popularize and apply.

Description

technical field [0001] The invention provides a preparation method of polycrystalline cubic boron nitride (PcBN), which belongs to the field of advanced tools for cutting materials. Background technique [0002] Cutting tools are tools used for cutting in machinery manufacturing. At present, the widely used metal cutting tool materials include carbon tool steel, alloy tool steel, high-speed steel, hard alloy and ceramic tools, etc., while high-speed steel in the structure of tool materials in my country It has an absolute advantage, accounting for about 60%, and cemented carbide is less than 40%. Because the tools used for high-speed cutting need to have good toughness, strong impact resistance and good wear resistance at the same time, which directly affects the cutting precision, the traditional tool materials are facing great challenges. With the higher and higher requirements for high-speed cutting, ceramic cutting tools and so on came into being. [0003] Due to the th...

Claims

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Application Information

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IPC IPC(8): C22C29/16C22C1/04
Inventor 张锐李和鑫王海龙陈德良任振火李明亮关莉温合静
Owner FUNIK ULTRAHARD MATERIAL
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