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A kind of in-situ reaction to generate compound-bonded polycrystalline diamond and its preparation method

A polycrystalline diamond, in-situ reaction technology, applied in the field of superhard composite materials, can solve problems such as leaving soft spots

Active Publication Date: 2022-01-14
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ reaction to generate compound-bonded polycrystalline diamond and its preparation method, which solves the problem that the addition of Si, Ti, B, Ni, etc. in the traditional PCD method is easy to remain in the "scaffold" domain of diamond The problem of soft spots left by unreacted Ti, Si and their compounds

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  • A kind of in-situ reaction to generate compound-bonded polycrystalline diamond and its preparation method
  • A kind of in-situ reaction to generate compound-bonded polycrystalline diamond and its preparation method
  • A kind of in-situ reaction to generate compound-bonded polycrystalline diamond and its preparation method

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preparation example Construction

[0032] The invention provides a method for preparing polycrystalline diamond bonded by an in-situ reaction, comprising the following steps:

[0033] The Ti powder, Si powder and nano-diamond are ball milled for mechanical alloying to obtain a binder material; the molar ratio of the Ti powder to Si powder is equal to 3; the molar ratio of the nano-diamond to Si powder is >2 and ≤5 ;

[0034] Mixing the binder material with micro-diamonds to obtain a mixture;

[0035] Prepressing the mixture to obtain a precompact;

[0036] Sintering the pre-compact under high temperature and high pressure to obtain polycrystalline diamond bonded by in-situ reaction formation compounds;

[0037] The high temperature and high pressure sintering includes sequentially performing the first high temperature and high pressure sintering and the second high temperature and high pressure sintering; the temperature of the first high temperature and high pressure sintering is 1100-1300°C, and the holding t...

Embodiment 1

[0067] (1) 35 grams of binder material, according to the molar ratio Ti: Si: nano-diamond=3:1:3 proportioning (wherein the nano-diamond particle diameter is 2~12 nanometers accounted for 20% by mass, particle diameter 100 nanometers accounted for 80%); micron diamond 65g (wherein particle size is 10 micron 35g, 6 micron 20g, 0.5 micron 10g); first the titanium powder weighed and silicon powder and nano-diamond are mixed, under the argon condition of glove box, pack ball mill tank neutralize and seal; take it out and put it into a planetary ball mill with a ball-to-material ratio of 20:1, mechanically mix at 350r / min for 120min, and mechanically alloy to make a binder material; Open it down, put in the weighed micron diamond, and scrape and mix with the binder material evenly, and mix it by mechanical ball milling for 20 minutes to make a mixture; after stopping the machine, remove the ball milling tank, open it under argon gas in the glove box, and take out the preparation goo...

Embodiment 2

[0071] (1) 40 grams of binder material, according to the molar ratio Ti: Si: nano-diamond=3:1:5 proportioning (wherein the nano-diamond particle diameter is 2~12 nanometers account for 40% of the mass ratio, particle diameter 100 nanometers accounts for 60%), micron diamond 60g (wherein the particle size is 10 micron 35g, 6 micron 20g, 0.5 micron 5g); first the titanium powder weighed and silicon powder and nano-diamond are mixed, put into the ball mill tank under the condition of argon gas in the glove box neutralize and seal; take it out and put it into a planetary ball mill with a ball-to-material ratio of 20:1, mechanically mix at 350r / min for 120min, and mechanically alloy to make a binder material; Open it down, put in the weighed micron diamond, and scrape and mix with the binder material evenly, and mix it by mechanical ball milling for 20 minutes to make a mixture; after stopping the machine, remove the ball milling tank, open it under the condition of argon in the glo...

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Abstract

The invention provides a compound-bonded polycrystalline diamond produced by in-situ reaction and a preparation method thereof, belonging to the technical field of superhard composite materials. In the present invention, Ti powder, Si powder and nano-diamond are ball-milled for mechanical alloying to obtain a binder material; the molar ratio of the Ti powder to Si powder is equal to 3; the molar ratio of the nano-diamond to Si powder is >2 and ≤5; the binder material is mixed with micro-diamonds, the resulting mixture is pre-pressed, and the pre-compacts obtained are sintered under high temperature and high pressure to obtain polycrystalline diamond bonded by in-situ reaction-generated compounds. Due to the excessive addition of nano-diamonds and the high-pressure environment, the nano-diamonds are left after reacting with Ti and Si and can be retained, which solves the problem of adding Si, Ti, B, Ni, etc. in the traditional PCD preparation method. "Zone" remains the problem of unreacted Ti, Si and their compounds leaving soft spots.

Description

technical field [0001] The invention relates to the technical field of superhard composite materials, in particular to a compound-bonded polycrystalline diamond produced by in-situ reaction and a preparation method thereof. Background technique [0002] Diamond is the hardest material known in the world. Since the artificial synthesis of diamond in the 1950s, diamond and its products have been widely used in the field of processing, as cutting, drilling or grinding and polishing tools. However, synthetic diamonds are not easy to be directly used as cutting tools due to their small particles (industrial diamonds generally have a particle size of less than 1 mm). Usually, diamond micropowder (0.5-60 μm) is used as the main body, and is sintered by adding binder powder or by blending - The precipitated reaction is sintered together to obtain an isotropic diamond polycrystalline sintered body polycrystalline diamond, referred to as PCD. [0003] Traditional PCD materials are m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C26/00B22F3/10
CPCC22C1/05C22C26/00B22F3/1039
Inventor 王明智赵玉成邹芹屈静韩欣宁泱锦翟新宣刘树通
Owner YANSHAN UNIV
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