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Preparation method for high-performance diamond sintered products

A sintered product and diamond technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of easy segregation of components, large energy consumption, high sintering temperature, etc., and achieve the effect of shortening the reaction time, good sintering performance and lowering the reaction temperature

Pending Publication Date: 2019-09-10
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional metal-bonded diamond tools are often hot-pressed and sintered. The sintering temperature is high, the energy consumption is large, and the diamond is easy to be burned. During sintering, the liquid phase leaks seriously and the components are easily segregated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 9g of Cu-based pre-alloyed powder and 1g of diamond particles were weighed respectively, and mixed with a planetary ball mill to prepare a mixture. Then add two drops of liquid paraffin to the mixture, mix well, and seal it for 12 hours. The sealed and placed mixture is preformed with a single-column hydraulic press to obtain a preformed diamond compact. Then, the cold isostatic press was used to further press the pre-pressed diamond compact (the pressure was 150MPa, and the holding time was 180S) to obtain a dense green compact. After drying, put the green body into a microwave oven for sintering, the sintering temperature is 740°C, and the holding time is 5 minutes. The fired diamond products were tested for flexural strength and hardness. The results show that compared with the traditional sintering method, the hardness and flexural strength of the abrasive tool are increased by 10-15% and 15-20% respectively.

Embodiment 2

[0026] 8g of Fe-based pre-alloyed powder and 2g of diamond particles were weighed respectively, and mixed with a rolling ball mill to prepare a mixture. Then add two drops of liquid paraffin to the mixture, mix well, and seal it for 24 hours. The sealed and placed mixture is preformed with a single-column hydraulic press to obtain a preformed diamond compact. The cold isostatic press was used to further press the prepared initial-pressed diamond compact (with a pressure of 220 MPa and a holding time of 100 s) to obtain a dense green compact. After drying, put the green body into a spark plasma sintering furnace for sintering, the sintering temperature is 760°C, and the holding time is 5 minutes. The fired diamond products were tested for flexural strength and hardness. The results show that compared with the traditional sintering method, the hardness and flexural strength of the abrasive tool are increased by 12-17% and 16-23% respectively.

Embodiment 3

[0028] Weighed 7.5g of Ni-based pre-alloyed powder and 2.5g of diamond particles respectively, and mixed them with a three-dimensional mixer to prepare a mixture. Then add two drops of liquid paraffin to the mixture, mix well, and seal it for 17 hours. The sealed and placed mixture is preformed with a single-column hydraulic press to obtain a preformed diamond compact. The cold isostatic press was used to further press the prepared initial-pressed diamond compact (with a pressure of 170 MPa and a holding time of 120 s) to obtain a dense green compact. After drying, put the green body into a microwave oven for sintering, the sintering temperature is 780°C, and the holding time is 10 minutes. The fired diamond products were tested for flexural strength and hardness. The results show that compared with the traditional sintering method, the hardness and flexural strength of the abrasive tool are increased by 11-16% and 16-21% respectively.

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Abstract

The invention belongs to the field of diamond product preparation, and relates to a preparation method for high-performance diamond sintered products. The preparation method comprises the following steps: (a) 70-90% of prealloy powder and 10-30% of diamond particles are taken according to the mass percentage for uniform mixing; and temporary bonding agents are fed for sealing placement by 12-24 h;(b) the mixtures prepared in the step (a) are molded through primary pressing by an oil press; (c) the products prepared in the step (b) are vacuumized, and are further pressed and dried by adoptinga cold isostatic press to prepare grinder blanks; and (d) the grinder blanks prepared in the step (c) are sintered by using a microwave sintering furnace or a discharge plasma sintering furnace to prepare metal bond diamond products. The method has the characteristics of high strength, high hardness, uniform components, low sintering temperature, energy conservation, simple operation and easy industrial production.

Description

technical field [0001] The invention provides a preparation method for preparing high-performance diamond sintered products, belonging to the technical field of diamond tool preparation. Background technique [0002] Metal bonded diamond sintered products have high strength, hardness and toughness, and have a good holding force on diamond abrasive grains. Whether the excellent properties of diamond abrasive grains in metal bonded diamond sintered products can be fully exerted, the holding force of the bond and the strength and hardness of the bond are crucial factors. [0003] The quality of the metal bond depends on the holding force of the diamond, including the strength of the metal bond, the hardness of the metal bond, and the bonding force with the diamond. The bond is the bridge between the abrasive grains. If the strength of the abrasive grains is not enough, the excellent performance of diamond will not be fully exerted. As the bonding agent with the highest bondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C26/00C22C1/05B22F3/04B22F3/105
CPCC22C26/00C22C1/05B22F3/04B22F3/105B22F2003/1051B22F2003/1054B22F2998/10B22F1/10B22F3/02
Inventor 赵志伟晋凯郑红娟霍少华陈利霞路朋献
Owner HENAN UNIVERSITY OF TECHNOLOGY
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