Fused silica ceramic material containing holmium 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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Problems solved by technology

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Method used

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Effect test

Embodiment 1

[0017] The raw materials used in the fused silica ceramic material containing holmium oxide and the weight percentage of the raw materials are: 97.5% of fused silica fine powder <0.043mm, and 2.5% of holmium oxide fine powder <0.030mm. The fused silica fine powder and the holmium 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 1 h...

Embodiment 2

[0020] The raw materials used in the fused silica ceramic material containing holmium oxide and the weight percentage of the raw materials are: 98.5% of fused silica fine powder <0.043mm, and 1.5% of holmium oxide fine powder <0.030mm. The fused silica fine powder and the holmium 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 1 h...

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Abstract

The invention relates to a fused silica ceramic material containing holmium 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 holmium oxide powder. The preparation method comprises the following steps: dry-mixing the fine fused silica powder and the fine holmium 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 holmium 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, and in particular relates to a fused quartz ceramic material containing holmium oxide and a preparation method thereof. Background technique [0002] Fused silica is a glassy SiO 2 It is a substance with high temperature resistance (1000°C), low thermal expansion coefficient (0.5×10-6 / °C) and other characteristics. Fused silica can be used as raw material to prepare directly molded fused silica products and fused silica ceramic materials. [0003] Fused quartz ceramic material is made of fused silica glass fragments as raw material, which is sintered after grinding, pulping, casting, or sintering; or it is made by grinding, pressure forming and sintering. Fused silica ceramic materials prepared from fused silica are less harmful to crystallization than direct molding fused silica products, can be used in high temperature environments above 1000°C, and have excellent thermal s...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622
Inventor 王志发卜景龙马飞贾翠王瑞生王榕林陈思思
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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