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Zirconium boride contained fused quartz ceramic material and preparation method thereof

A technology for fused silica and ceramic materials, applied in the field of high-temperature structural ceramics, can solve the problems of increasing the manufacturing cost and high price of fused silica ceramic materials, and achieve the effects of high safety and reliability, strengthening national defense, and broad application prospects.

Inactive Publication Date: 2014-01-08
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of the above-mentioned rare earth oxides or nano-scale additives is high, which increases the manufacturing cost of fused silica ceramic materials, and the inhibitory effect on fused silica devitrification needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw materials used in the fused silica ceramic material containing zirconium boride and the weight percentage of raw materials are: d 50 =10.0μm fused silica powder 99.0%, d 50 =9.0μm zirconium boride powder 1.0%. Mix the fused silica powder and zirconium boride powder according to the ratio, then add ethanol, and stir to form a fluid slurry. The mass of ethanol added: the mass of fused silica powder and zirconium boride powder=1:1. Continue to stir the slurry for 2 minutes, then dealcoholize and dry to obtain a mixed dry powder, then gradually add 6.5% (weight percentage, plus) of polyvinyl alcohol solution binder with a mass concentration of 2% to the mixed dry powder, and continue to stir and mix After 2 minutes, sieve, place in airtight plastic bag after sieving and trap the material for 3 hours to obtain a blank that can be used for sample compression molding. The blank is molded, and the molding pressure of the blank is 100MPa. The molded green body was dri...

Embodiment 2

[0022] The raw materials used in the fused silica ceramic material containing zirconium boride and the weight percentage of raw materials are: d 50 =10.0μm fused silica powder 97.0%, d 50 =9.0μm zirconium boride powder 3.0%. Mix the fused silica powder and zirconium boride powder according to the ratio, then add water, and stir to form a fluid slurry. The mass of the water added: the mass of fused silica powder and zirconium boride powder=1.2:1. Continue to stir the slurry for 2.5 minutes and then obtain a mixed dry powder after dehydration and drying, then gradually add 5.5% (weight percentage, plus) of polyvinyl alcohol solution binder with a mass concentration of 2.5% to the mixed dry powder, and continue to stir and mix for 2.5 After 3.5 hours, it was sieved, and placed in a sealed plastic bag to trap the material for 3.5 hours to obtain a blank for sample compression molding. The blank is molded, and the forming pressure of the blank is 110MPa. The molded green body wa...

Embodiment 3

[0025] The raw materials used in the fused silica ceramic material containing zirconium boride and the weight percentage of raw materials are: d 50 = 10.0μm fused silica powder 98.0%, d 50 =9.0μm zirconium boride powder 2.0%. Mix the fused silica powder and zirconium boride powder according to the ratio, then add ethanol and stir to form a fluid slurry. The mass of ethanol added: the mass of fused silica powder and zirconium boride powder=1.5:1. Continue to stir the slurry for 3 minutes, then dealcoholize and dry to obtain a mixed dry powder, then gradually add 6% (weight percentage, plus) of polyvinyl alcohol solution binder with a mass concentration of 2.5% to the mixed dry powder, and continue to stir and mix After 3 minutes, it was sieved, and after sieving, it was placed in an airtight plastic bag to trap the material for 4 hours to obtain a blank for sample molding. The blank is molded, and the forming pressure of the blank is 90MPa. The molded green body was dried at...

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Abstract

The invention discloses a zirconium boride contained fused quartz ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing 95.0-99.7wt % of fused quartz powder and 0.3-5.0% of zirconium boride powder respectively, then adding ethanol or water, stirring to form slurry with flowability, dealcoholizing or dehydrating and drying to obtain a mixed dry powder; adding a polyvinyl alcohol solution into the mixed dry powder, stirring and mixing, sieving, and then, placing the mixture into a sealed plastic bag, ageing for 3-4 hours to obtain a blank to be subjected to compression molding; drying the blank after the blank is subjected to compression molding; sintering the dried blank at the temperature of 1300-1400 DEG C to obtain the zirconium boride contained fused quartz ceramic material. The thermal expansivity of the fused quartz ceramic material to which the zirconium boride is introduced is greatly reduced, so that the zirconium boride has a remarkable inhibiting effect for the crystallization of fused quartz, and the zirconium boride contained fused quartz ceramic material is a high-temperature structural ceramic material with higher safety and reliability.

Description

technical field [0001] The invention relates to the field of high-temperature structural ceramics, in particular to a zirconium boride-containing fused quartz ceramic material and a preparation method thereof. Background technique [0002] Fused silica has excellent characteristics such as low thermal expansion, and its thermal expansion rate at 800 ° C is only 0.05%, and the corresponding thermal expansion coefficient is 0.64×10 -6 / °C, the fused silica ceramic material prepared from fused silica powder has excellent thermal shock resistance, and is widely used in glass melting, steel and non-ferrous metallurgy, electric power, electronics, military missiles, spacecraft and other fields. However, granular fused silica in fused silica ceramic materials is a thermodynamically unstable high-energy state substance. Under high temperature conditions > 1200 ° C, fused silica is easy to gradually devitrify (or crystallize) to form a high thermal expansion rate (or high thermal ...

Claims

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Application Information

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IPC IPC(8): C03C10/14
Inventor 卜景龙
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY