Fused silica ceramic material containing ytterbium oxide and preparation method thereof

A technology of fused silica and ceramic materials, applied in the field of high temperature structural ceramics

Inactive Publication Date: 2010-07-07
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Embodiment 1

[0017] The raw materials used for the fused silica ceramic material containing ytterbium oxide and the weight percentage of the raw materials are: 98% of fused silica fine powder <0.043mm, and 2% of ytterbium oxide fine powder <0.030mm. The fused silica fine powder and the ytterbium oxide fine powder are measured according to the proportion and then dry-mixed for 2 minutes, then gradually add 7% of polyvinyl alcohol solution with a mass concentration of 2% (percentage by weight, added) under constant stirring, and continue to stir and mix for 3 Pass through a 40-mesh sieve after 1 minute, continue to stir for 1 minute after sieving, and place the material in a sealed plastic bag to trap the material. After 4 hours of trapping the material, obtain a blank that can be used for pressure molding. The blank is formed by a hydraulic press, and the forming pressure of the blank is 100MPa. The molded green body was dried at room temperature of 20°C for 4 hours, then dried at 70°C for ...

Embodiment 2

[0020] The raw materials used for the fused silica ceramic material containing ytterbium oxide and the weight percentage of the raw materials are: 97% of fused silica fine powder <0.043mm, and 3% of ytterbium oxide fine powder <0.030mm. The fused silica fine powder and the ytterbium oxide fine powder are measured according to the proportion and then dry-mixed for 2 minutes, then gradually add 7% of polyvinyl alcohol solution with a mass concentration of 2% (percentage by weight, added) under constant stirring, and continue to stir and mix for 3 Pass through a 40-mesh sieve after 1 minute, continue to stir for 1 minute after sieving, and place the material in a sealed plastic bag to trap the material. After 4 hours of trapping the material, obtain a blank that can be used for pressure molding. The blank is formed by a hydraulic press, and the forming pressure of the blank is 100MPa. The molded green body was dried at room temperature of 20°C for 4 hours, then dried at 70°C for ...

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Abstract

The invention relates to a fused silica ceramic material containing ytterbium oxide and a preparation method thereof, belonging to the field of high-temperature structural ceramic materials. The ceramic material is prepared from the following materials by weight percentage: 97% to 99% of fine fused silica powder and 1% to 3% of fine ytterbium oxide powder. The preparation method comprises the following steps: dry-mixing the fine fused silica powder and the fine ytterbium oxide powder; wet-mixing the mixture by adding polyvinyl alcohol solution as binding agent; further sieving, stirring and ageing the mixture to obtain the perform body for molding the green body; molding the green body by a hydraulic press with the molding pressure being higher than or equal to 50MPa; drying and sintering the green body at 1,200 to 1,400 DEG C; and standing for 1 to 3 hours to obtain the fused silica ceramic material containing ytterbium oxide. The invention provides a novel high-temperature structural material for glass melting, ferrous and non-ferrous metallurgy, electronics, military missiles, spacecraft and other fields in China and has wide application prospect and great significance in strengthening the national defense.

Description

technical field [0001] The invention belongs to the field of high-temperature structural ceramics, in particular to a fused silica ceramic material containing ytterbium oxide and a preparation method thereof. Background technique [0002] Direct molding fused silica products are made by blowing, pressing and other processes of glassy fused silica melt. Fused silica products directly molded from fused silica have excellent properties such as high temperature resistance, chemical corrosion resistance, and thermal shock resistance. better application effect in the field. When direct molding fused silica products are subjected to thermal stress or mechanical stress during high temperature use, the glassy fused silica is easy to devitrify and crystallize, which leads to the dynamic crack expansion of direct molding fused silica products, and the strength and thermal shock resistance of the products, etc. Performance degradation, use times and safety reliability are greatly redu...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622
Inventor 卜景龙王志发马飞贾翠王榕林王瑞生
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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