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Preparation method of polycrystalline diamond cutter for cutting straw

A technology of polycrystalline diamond and diamond micropowder, which is applied in the field of straw cutting tools, can solve the problems of affecting the uniform distribution of binder phase, the scarcity of natural diamond, and the reduction of PCD wear resistance, so as to achieve good market prospects and broaden the field of commercial use , Strong wear and corrosion resistance effect

Inactive Publication Date: 2020-04-14
江苏禾吉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural diamonds are scarce and expensive, and it is difficult to meet the needs of a large number of applications.
[0003] Polycrystalline diamond (Polycrystalline diamond) is a kind of artificial diamond, which is used to replace natural diamond (single crystal), breaking through the limitation of quantity and price. Under high temperature and high pressure, the particles are in contact with another particle, and there is a strong bond between the diamond and the diamond particles. The pressure at the contact point of the grains is high, so that the diamond particles themselves are fragmented, and most of the fragmented diamond particles produced by the fragmentation are still Concentrated in the original position, the grain boundaries of the fragmented diamond are not all filled by the binder
This affects the uniform distribution of the binder phase, which ultimately leads to a reduction in the wear resistance of PCD

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a polycrystalline diamond tool for cutting stalks, comprising the following steps:

[0021] Step 1, weighed in parts by weight, 75 parts of diamond micropowder, 1 part of nano-carbon, 8 parts of polyvinylpyrrolidone, 1 part of silicon nitride, 1 part of copper oxide, 1 part of castor oil, 28 parts of straw fiber , 0.2 parts of chromium carbide;

[0022] Step 2: Put the straw fiber into the tube furnace for calcination at 500°C in a vacuum environment, then transfer it to a ball mill, and add diamond micropowder, nano-carbon, silicon nitride, copper oxide, castor oil and chromium carbide to the ball mill at 12000rpm Ball milling for 30 hours, after drying, granulation;

[0023] Step 3: Put the obtained masterbatch into the mold of the cutting tool, place it in a six-eight press and sinter to obtain the cutting tool; the sintering pressure is 7.5GPa, and the temperature is 1600°C.

[0024] The blade surface roughness Ra of the polycrystalline dia...

Embodiment 2

[0028] A preparation method of a polycrystalline diamond tool for cutting stalks, comprising the following steps:

[0029] Step 1, weighed in parts by weight, 78 parts of diamond micropowder, 3 parts of nano-carbon, 10 parts of polyvinylpyrrolidone, 2 parts of silicon nitride, 3 parts of copper oxide, 2 parts of castor oil, 30 parts of straw fiber , 0.4 parts of chromium carbide;

[0030] Step 2: Put the straw fiber into the tube furnace for calcination at 600°C in a vacuum environment, then transfer it to a ball mill, and add diamond micropowder, nano-carbon, silicon nitride, copper oxide, castor oil and chromium carbide to the ball mill at 13000rpm Ball milling for 30 hours, after drying, granulation;

[0031] Step 3, put the obtained masterbatch into the mold of the tool, put it into a six-eight press and sinter to obtain the tool, wherein the sintering pressure is 8.0GPa, and the temperature is 1700°C.

[0032] The blade surface roughness Ra of the polycrystalline diamon...

Embodiment 3

[0036] A preparation method of a polycrystalline diamond tool for cutting stalks, comprising the following steps:

[0037] Step 1, weighed in parts by weight, 80 parts of diamond micropowder, 5 parts of nano-carbon, 12 parts of polyvinylpyrrolidone, 3 parts of silicon nitride, 4 parts of copper oxide, 4 parts of castor oil, 35 parts of straw fiber , 0.5 parts of chromium carbide;

[0038] Step 2: Put the straw fiber into the tube furnace for calcination at 700°C in a vacuum environment, then transfer it to a ball mill, and add diamond micropowder, nano-carbon, silicon nitride, copper oxide, castor oil and chromium carbide to the ball mill at 15000rpm Ball milling for 30 hours, after drying, granulation;

[0039] Step 3, put the obtained masterbatch into the mold of the cutting tool, put it into a six-eight press machine for sintering, and obtain the cutting tool, wherein the sintering pressure is 8.5GPa, and the temperature is 1800°C.

[0040] The blade surface roughness Ra ...

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Abstract

The invention discloses a preparation method of a polycrystalline diamond cutter for cutting straw. The method comprises the following steps: weighing 75-80 parts by weight of diamond micro powder, 1-5 parts by weight of nanocarbon, 8-12 parts by weight of polyvinylpyrrolidone, 1-3 parts by weight of silicon nitride, 1-4 parts by weight of copper oxide, 1-4 parts by weight of castor oil, 28-35 parts by weight of straw fibers and 0.2-0.5 part by weight of chromium carbide; putting the straw fibers into a tubular furnace, calcining in a vacuum environment, transferring into a ball mill, adding the diamond micro-powder, the nanocarbon, the silicon nitride, the copper oxide, the castor oil and the chromium carbide into a ball mill, carrying out ball milling for 30 hours, drying, and granulating; and putting the obtained master batch into a die of a cutter, and sintering in a sixty over eighth press to obtain the cutter. The preparation method is simple, the obtained polycrystalline diamondcutter is high in hardness, curled edges are generated due to non-uniform cutting, and the cutter face can be protected without smearing a protective agent when straw of saline-alkali soil is cut.

Description

technical field [0001] The invention belongs to the field of straw cutting tools, and in particular relates to a preparation method of a polycrystalline diamond tool for cutting straw. Background technique [0002] Diamond has been used as a superhard tool material in the field of cutting processing for a long time. However, natural diamonds are scarce and expensive, making it difficult to meet the needs of a large number of applications. [0003] Polycrystalline diamond (Polycrystalline diamond) is a kind of artificial diamond, which is used to replace natural diamond (single crystal), breaking through the limitation of quantity and price. Under high temperature and high pressure, the particles are in contact with another particle, and the diamond and diamond particles are bonded by strong bonds. The pressure at the contact point of the grains is high, so that the diamond particles themselves are fragmented, and most of the fragmented diamond particles produced by the fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/632C04B35/634C04B35/645
CPCC04B35/52C04B35/632C04B35/63444C04B35/645C04B2235/3281C04B2235/3839C04B2235/3873C04B2235/422C04B2235/427C04B2235/5436C04B2235/77C04B2235/96C04B2235/9669
Inventor 王路明宦海祥钟栋青王上季杰蒋蕾
Owner 江苏禾吉新材料科技有限公司
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