Preparation method of ceramic bond for low-temperature high-strength cubic boron nitride (CBN) grinding tool

A technology of ceramic bond and cubic boron nitride, which is applied in the field of cubic boron nitride abrasive ceramic bond, can solve the problems of impact resistance, poor fatigue resistance, high sintering temperature of the bond, and difficulty in preparation, etc., and achieve refractoriness Low, high flexural strength, good fluidity

Inactive Publication Date: 2011-03-30
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare by traditional methods, and the binder still has high sintering temperature, low strength, poor impact resistance and fatigue resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Take 47.5% of silicon dioxide, 11.5% of aluminum hydroxide, 17.0% of anhydrous sodium carbonate and 24.0% of boric acid and mix them evenly by weight percentage, and pass through a 200-mesh sieve after grinding to obtain a mixture;

[0017] 2) Melt the mixture prepared in step 1 and quench it in water. The melting conditions are as follows: heat up to 500°C at a rate of 5°C / min, then heat up to 700°C at a rate of 4°C / min, and then heat up to 700°C at a rate of 2°C / min. The temperature is raised to 900°C at the rate of ℃ / min, and finally the temperature is raised to 1300°C at the rate of 3°C / min and then smelted for 3 hours;

[0018] 3) Dry the product obtained after water quenching in step 2 at 100°C for 4 hours, then grind it in a high-energy ball mill for 2 hours, and pass through a 300-mesh sieve to obtain a basic vitrified bond;

[0019] 4) the base vitrified bond that step 3 makes and nano-Cr 2 o 3 Mixed, Nano Cr 2 o 3 The weight is 6.0% of the basic vitrifi...

Embodiment 2

[0022] 1) Mix 65.0% silicic acid, 8.0% aluminum hydroxide, 12.0% anhydrous sodium carbonate and 15.0% boric acid by weight percentage, and pass through a 300-mesh sieve after grinding to obtain a mixture;

[0023] 2) Melt the mixture obtained in step 1 and quench it in water. The smelting conditions are: heat up to 500°C at a rate of 4°C / min, then heat up to 700°C at a rate of 3°C / min, and then heat up to 700°C at a rate of 2°C / min. The temperature is raised to 900°C at the rate of ℃ / min, and finally the temperature is raised to 1300°C at the rate of 3°C / min and then smelted for 4 hours;

[0024] 3) The product obtained after water quenching in step 2 was dried at 150°C for 1 hour, then ground in a rolling ball mill for 12 hours, and passed through a 200-mesh sieve to obtain a basic vitrified bond;

[0025] 4) the base vitrified bond that step 3 makes is mixed with nanometer V 2 o 3 Mix, Nano V 2 o 3 The weight is 2.0% of the basic vitrified cement to prepare the vitrified...

Embodiment 3

[0028] 1) Take 47.5% of silicon dioxide, 11.5% of aluminum hydroxide, 17.0% of anhydrous sodium carbonate and 24.0% of boric acid and mix them evenly by weight percentage, and pass through a 100-mesh sieve after grinding to obtain a mixture;

[0029] 2) Melting the mixture obtained in step 1 and quenching in water, the conditions of the smelting are: heating up to 500° C. at a rate of 5° C. / min, then raising the temperature to 700° C. at a rate of 4° C. / min, and then heating up to 700° C. at a rate of 3° C. / min. The temperature is raised to 900°C at the rate of ℃ / min, and finally the temperature is raised to 1400°C at the rate of 2°C / min and then smelted for 2 hours;

[0030] 3) The product obtained after water quenching in step 2 was dried at 50°C for 6 hours, then ground in a grinder for 7 hours, and passed through a 100-mesh sieve to obtain a basic vitrified bond;

[0031] 4) the base vitrified bond that step 3 makes and nanometer ZrO 2 Mixed, Nano ZrO 2 The weight is 2.0...

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Abstract

The invention discloses a preparation method of ceramic bond for a low-temperature high-strength cubic boron nitride (CBN) grinding tool, which comprises the following steps: evenly mixing 35-75% of a, 2-15% of b, 5-20% of c and 5-25% of d by weight percent, grounding and sieving, melting at 1200-1400 DEG C for 1-6h, carrying out water quench, drying, secondary grinding and secondary sieving to obtain basic ceramic bond, and evenly mixing the obtained basic ceramic bond with nano oxide the weight of which accounts for 0.2-15% of that of the basic ceramic bond to obtain the ceramic bond of theinvention, wherein the a is silica or silicon dioxide, the b is aluminum hydroxide or aluminum oxide, the c is anhydrous sodium carbonate or sodium oxide, and the d is boric acid or boron trioxide. Through adding nano oxide to the basic ceramic bond, the refractoriness of the basic ceramic bond is reduced by 10-50 DEG C, the fluidity is improved by 5-25%, and the breaking strength is improved by 5-45%.

Description

technical field [0001] The invention relates to a ceramic bond for cubic boron nitride abrasive tools, in particular to a preparation method of a low-temperature high-strength cubic boron nitride abrasive tool ceramic bond. Background technique [0002] Common vitrified bonded abrasive tools mainly include grinding wheels, oilstones, honing bars, grinding discs and grinding heads, etc. The key to determining the performance of vitrified bonded abrasive tools is the performance of the bond. The improvement of the performance of the binder requires a higher sintering temperature, but because CBN will transform into a graphite-like hexagonal structure at high temperature and lose its superhardness, and the alkali metal oxide in the vitrified binder will be at a temperature above 800°C Strongly corrodes CBN. In order to give full play to the grinding potential of superhard abrasives, one of the ideas to solve the problem is to reduce the sintering temperature, but reducing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63
Inventor 赵志伟郑红娟闫国进栗正新徐三魁李颖
Owner HENAN UNIVERSITY OF TECHNOLOGY
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