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Method for preparing cubic born nitride-silicon carbide composite ceramic material and product thereof

A technology of cubic boron nitride and multiphase ceramics, which is applied in the field of powder metallurgy, can solve problems such as limiting the scope of use and increasing the cost of preparing cubic boron nitride-ceramic superhard materials, and achieves convenient mechanical properties, a wide range of composition changes, The effect of improving the service life

Inactive Publication Date: 2014-07-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical method increases the preparation cost of cubic boron nitride-ceramic superhard material and limits its application range.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of cubic boron nitride-silicon carbide composite ceramic material, comprising the following steps:

[0018] Step 1, the mixed powder composed of 80g of cubic boron nitride particles, 10g of phenolic resin powder, and 10g of carbon powder, mixed with 100g of alcohol, was wet-mixed and ball-milled on a high-energy ball mill for 12 h, and the ball-milled powder was subjected to After drying at 80°C, pass through a 200-mesh sieve, take the under-sieve material as a mixed powder, take 50g of the mixed powder and put it into a mold, and shape it at 300°C and a pressure of 35MPa to obtain a green body;

[0019] Step 2, after the green body is heat-insulated and heat-treated at 900° C. for 1 hour, a cubic boron nitride ceramic blank is obtained;

[0020] Step 3, place the blank in a graphite crucible, place 20-21 g of bulk metal silicon on the blank, and place it in a 6.8×10 -3 Under a vacuum environment of Pa, heat preservation at 1500°C for 2 hours to ob...

Embodiment 2

[0023] A cubic boron nitride-silicon carbide composite ceramic material, the preparation process comprising the following steps:

[0024] Step 1, the mixed powder composed of 120g of cubic boron nitride particles, 25g of phenolic resin powder, 30g of carbon powder, and 5g of silicon powder is mixed with 200g of alcohol and wet-mixed on a high-energy ball mill for 24 hours. The ball-milled powder is dried at 80°C, passed through a 200-mesh sieve, and the under-sieve is taken as a mixed powder, and 50 g of the mixed powder is put into a mold, and formed at 300°C and a pressure of 25 MPa to obtain a green body;

[0025] Step 2, after the green body is heat-preserved and heat-treated at 850° C. for 1 h, a cubic boron nitride ceramic blank is obtained;

[0026] Step 3, place the blank in a graphite crucible, place 18-19g of granular metal silicon on the blank, and place it in a 1×10 -3 Under a vacuum environment of Pa, heat preservation at 1480°C for 2 hours to obtain a sintered c...

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Abstract

The invention relates to a method for preparing a cubic born nitride-silicon carbide composite ceramic material, comprising the following steps: wetly mixing 60-80% of cubic born nitride particles, 10-15% of binder, 10-15% of carbon powder and 0-10% of silicon power together by weight percent, thereby obtaining mixed powder; forming the mixed powder at 300 DEG C and under the pressure of 20-45 MPa, thereby obtaining a green body; performing thermal treatment on the green body to obtain a cubic born nitride composite ceramic green body; putting the green body in a graphite crucible, putting an appropriate quantity of powder or silicon blocks on the green body, and preserving heat at 1480-1550 DEG C for 1 h in a vacuum environment superior to 10-2 Pa, thereby obtaining a sintering body; and cooling the sintering body in the furnace, thereby obtaining compact cubic born nitride-silicon carbide composite ceramic material. The process is a low-cost high-efficiency preparation method capable of obtaining high-density, high-content cubic born nitride-silicon carbide composite ceramics; and the prepared composite ceramics can be used as but not limited to the ultra-hard material for various wearable engineering fields.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a preparation process of a superhard material, in particular to a preparation method of a high-content cubic boron nitride-silicon carbide ceramic composite ceramic material. Background technique [0002] The binder of cubic boron nitride can be resin, metal or ceramic. Cubic boron nitride superhard materials using ceramic bond have the common characteristics of ceramic bond and cubic boron nitride. Compared with resin or metal bonded cubic boron nitride abrasive materials, ceramic bond cubic boron nitride superhard materials As a grinding tool material, it has strong grinding ability, low grinding temperature, high durability of the grinding tool, good shape retention during grinding, high dimensional accuracy of the processed parts, and good overall self-sharpening of the grinding tool. The dressing interval is long, and the dressing is relatively easy. It is not easy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/5831C04B35/5835C04B35/622
Inventor 林文松
Owner SHANGHAI UNIV OF ENG SCI
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