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Diamond surface modification method

A surface modification, diamond technology, applied in the direction of diamond, chemical instruments and methods, metal material coating technology, etc., can solve the problems of unfavorable protection of diamond strong binding force, inability to form a complete film layer, thick surface coating thickness, etc. Achieve strong binding force, slow down the rate of grain growth, and reduce the effect of interface thermal resistance

Active Publication Date: 2022-03-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molten salt method can effectively modify the diamond surface, but at a lower temperature, a complete film cannot be formed, which is not conducive to protecting the diamond and forming a strong bond
[0005] Therefore, the molten salt method still has problems such as excessive surface coating thickness, high reaction temperature, uneven modified layer, and continuous coating of the diamond surface.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] like figure 1 Shown, the present invention comprises the steps:

[0038] Step 1: Weigh 1.5g chromium powder, 3g lithium chloride, 2g sodium chloride, 2.5g potassium chloride and 1g sodium fluoride respectively, put the weighed materials into the mixing tank, add zirconia balls, ball mill 12 hours.

[0039]Step 2: Put the ball-milled material into the crucible, put the crucible into the tube furnace, and put Ar and H into the tube furnace 2 Mixture of Ar and H 2 H in the mixture 2 The volume percentage is 15%, and the temperature is raised to 800°C at a heating rate of 5°C / min and kept for 120min. When the end temperature drops to room temperature, stop the gas supply, take out the crucible and grind and sieve the reaction product (180 mesh screen) , to obtain abrasives.

[0040] Step 3: Select diamond particles of MDB8 type; diamond particle size: 70-80 μm; clean and dry the selected diamond particles; weigh 100g of diamond particles and put them in a 10% NaOH solu...

Embodiment 2

[0047] The present invention comprises the steps:

[0048] Step 1: Select and weigh 1.5g titanium powder, 2g sodium chloride, 2.5g potassium chloride, 3g lithium chloride and 1g sodium fluoride, put the weighed materials into the mixing tank, add zirconia grinding balls, Ball mill for 12 hours.

[0049] Step 2: Put the ball-milled material into the crucible, put the crucible into the tube furnace, set the heating curve of the tube furnace, feed Ar gas, and heat up from room temperature to 800 °C at a heating rate of 3 °C / min After 120 minutes, when the operation is over and the temperature drops below 100°C, the Ar gas is turned off, the crucible is taken out, and the reaction product is ground and sieved (180-mesh sieve) to obtain ground material.

[0050] Step 3: select diamond particles of MDB8 type; diamond particle size: 70-80 μm; clean and dry the selected diamond particles; prepare a mass concentration of , weigh 100g of diamond particles and put them in a mass concent...

Embodiment 3

[0054] Step 1: Weigh 1g Ti powder, 1.5g lithium chloride, 0.8g sodium chloride, 1.5g potassium chloride and 0.2g sodium fluoride respectively, put the weighed materials into the mixing tank, and add zirconia grinding balls , Ball milling for 3 hours.

[0055] Step 2: Put the ball-milled material into the crucible, put the crucible into the tube furnace, and put Ar and H into the tube furnace 2 Mixture of Ar and H 2 H in the mixture 2 The volume percentage is 15%, with the heating rate of 1 °C / min, the temperature is raised to 700 ° C for 240 min, and when the end temperature drops to room temperature, the gas supply is stopped, the crucible is taken out, and the reaction product is ground and sieved (180 mesh screen). Obtain grind.

[0056] Step 3: Select MDB8 type diamond particles; diamond particle size: 3-40μm; clean and dry the selected diamond particles; weigh 100g of diamond particles and put them in a 10% NaOH solution, wash for 10min, take out and distill water Rep...

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Abstract

The diamond surface modification method comprises the following steps: mixing metal of a strong carbide forming element, lithium chloride, sodium chloride, potassium chloride and fluoride, and then carrying out ball milling; melting the ball-milled mixture in a neutral or reducing atmosphere to obtain a reactant, and grinding and sieving the reactant to obtain molten product powder; the method comprises the following steps: adding diamond into molten product powder, carrying out ball milling, and carrying out surface modification treatment on diamond particles under a neutral or reductive condition to obtain the diamond particles with the nanocrystalline film modified layer. According to the method, the surface of the diamond is plated with the nano carbide coating at the low temperature, damage to the surface of the diamond in the high-temperature process can be avoided, the wettability between the diamond and matrixes such as metal and ceramic can be effectively improved, interface defects are reduced, the binding force between the diamond and the matrixes is improved, and the use performance of the diamond in different industrial fields is fully exerted.

Description

technical field [0001] The invention belongs to the technical field of diamond surface modification, and in particular relates to a diamond surface modification method. Background technique [0002] In the diamond crystal structure, tetrahedrons are bonded to each other to form a face-centered cubic lattice without a three-dimensional framework. Every outer electron of a carbon atom participates in bonding, and there are no free electrons in the crystal. Due to the directionality and saturation of covalent bonds, diamond has a very stable crystal structure, showing high hardness, high strength, and high thermal conductivity. . However, diamond is chemically inert, and it is difficult to wet and react with base materials such as metals and ceramics. When used as a superhard machining tool material, it is often easy to fall off from the matrix due to insufficient bonding force, resulting in a low service life of the tool; in addition, diamond has high thermal conductivity, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/00C01B32/28C23C26/02
CPCC30B9/00C01B32/28C23C26/02
Inventor 李红伟谢月扬张利琪钱宗豪王慧娜
Owner CHANGAN UNIV