Composite processing method for realizing metallization of surfaces of diamonds

A surface metal and compound treatment technology, which is applied in the direction of metal material coating process, liquid chemical plating, coating, etc., can solve the problems of diamond surface metallization that have not been reported publicly, and achieve shortened processing time, simple equipment, and promotion speed effect

Inactive Publication Date: 2013-11-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, microwave energy is widely used in the heat treatment, synthesis and sintering research of inorganic materials, organic polymers and metal materials, but there is no public report on the use of microwave heating for diamond surface metallization

Method used

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  • Composite processing method for realizing metallization of surfaces of diamonds
  • Composite processing method for realizing metallization of surfaces of diamonds
  • Composite processing method for realizing metallization of surfaces of diamonds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare Ni-Cr-P coating on the surface of diamond by electroless plating, the diamond particle size is 150-180μm, figure 1 Its stereoscopic microscopic appearance. The bath composition includes NiSO 4 ·7H 2 O 10-20g / L, CrCl 3 ·6H 2 O 10-15g / L, NaH 2 PO 2 ·H 2 O 35-45g / L, C 6 h 8 o 7 ·H 2 O 30-35g / L, C 3 h 6 o 3 10-20g / L, NH 4 Cl 30-50g / L, use ammonia water and 30% acetic acid to adjust the pH value of the plating solution to 7-9, introduce diamond particles into the plating solution, and apply ultrasonic and mechanical stirring. The temperature of the water bath is 85°C for 1 hour, and take it out after cooling Chemically plated diamond particles, washed with water and dried. Mix the diamond particles with the zirconia ball mill to completely embed the diamond particles, then place the mixture in a corundum crucible with a capacity of 500ml and seal it, and then place it in a vacuum microwave heating furnace to heat and keep it warm for 20 minutes, with ...

Embodiment 2

[0024] Electroless plating is used to prepare Ni-Cr-W-P coating on the surface of diamond, the diamond particle size is 150-180 μm, and the composition of plating solution 1 includes NiSO 4 ·7H 2 O 20-30g / L, Na 2 WO 4 2H 2 O 50-70g / L, NaH 2 PO 2 ·H 2 O 15-25g / L, Na 3 C 6 h 5 o 7 ·H 2 O 100-110g / L, (NH 4 ) 2 SO 4 30-35g / L, pH value 8.8-9.2, temperature 90°C; bath 2 composition is CrF 3 10-20 g / L, NaH 2 PO 2 ·H 2 O 5-10 g / L, Na 3 C 6 h 5 o 7 ·H 2 O 5-10g / L, CrCl 3 ·6H 2O 1-5 g / L, pH value 8-10, mix the two plating solutions and stir them thoroughly, and place them in a water bath thermostat at a temperature of 90°C. The diamond particles were introduced into the plating solution, ultrasonically and mechanically stirred for plating, and the temperature of the water bath was kept at 90°C for 1 hour. After cooling, the electroless-plated diamond particles were taken out, washed with water and dried. Mix the diamond particles with the zirconia ball mill to...

Embodiment 3

[0026] Electroless plating is used to prepare Ni-P coating on the surface of diamond, the size of diamond particles is 150-180μm, and the composition of plating solution includes NiSO 4 ·6H 2 O 20-30g / L, NaAc 40-50g / L, NaH 2 PO 2 ·H 2 O 30-40 g / L, CH 3 COONH 4 10-20 g / L, a small amount of sulfuric acid, adjust the pH value of the plating solution to 5-6, introduce diamond particles into the plating solution, ultrasonically and mechanically stir for plating, the temperature of the water bath is 80°C, and the time is 1 hour. After cooling, take out the chemically plated diamond Granules, washed and dried. Mix the diamond particles with the zirconia ball mill to completely embed the diamond particles, then place the mixture in a corundum crucible with a capacity of 500ml and seal it, and then place it in a vacuum microwave heating furnace to heat and keep it warm for 20 minutes, with a microwave power of 1.5 KW, sintering temperature 800°C, vacuum degree 1.3×10 -3 Pa, and...

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Abstract

The invention discloses a composite processing method for realizing metallization of the surfaces of diamonds. The method comprises the following steps: performing chemical plating processing on diamond particles to enable the surfaces of the diamond particles to be uniformly coated with chemical plating layers; performing metallized processing on the surfaces of the diamond particles, packing a wave-absorbing material and the diamond particles subjected to chemical plating into a ball mill jar for realizing uniform material mixing, filling a corundum crucible with the mixture, sealing the surface of the corundum crucible and placing the corundum crucible in a vacuum micro-wave heating oven, and slowly rotating the oven for heating and insulating, wherein the heating temperature is 750-900 DEG C, the heating and insulating process takes 10-30 minutes, and the vacuity is 1.3*10<-3>Pa; separating the diamond particles from the wave-absorbing material. According to the invention, the chemical plating technology and the vacuum microwave quick heating technology are combined, so that the deposition temperature of the chemical plating becomes low, and obtained plating can be more uniform and compact; heat energy can be more effectively utilized through vacuum micro-wave heating; moreover, metallurgy diffusion reaction rate is promoted, the processing time is shortened, and graphitization of the diamonds can be well prevented in a vacuum processing environment.

Description

technical field [0001] The invention relates to a treatment method for surface metallization of polycrystalline diamond particles in the field of surface modification of diamond particles. Background technique [0002] For metal bond diamond tools, the physical and chemical compatibility of the matrix and diamond is one of the key factors to achieve the performance of the tool. Diamond tools are mostly prepared by sintering in vacuum or protective atmosphere, the purpose of which is to prevent premature graphitization of diamond in the presence of an oxidizing atmosphere. However, when the diamond and cemented carbide are mixed and welded on the steel tooth oil drill bit by surfacing welding technology, because it is carried out in the air environment, the flame temperature is high, which will easily lead to the graphitization of the diamond part and reduce its compressive strength. Greatly affect the use of diamond tools. Therefore, preventing diamond at high temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32C23C18/50
Inventor 张进薛屺晋勇黄敏李松霞
Owner SOUTHWEST PETROLEUM UNIV
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