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Low temperature mullite ceramic sintering process

A technology of low-temperature sintering and mullite, which is applied in the field of low-temperature sintering of ceramics, can solve the problems of complex process and large sintering shrinkage, and achieve the effect of long and short holding time

Inactive Publication Date: 2006-08-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-temperature sintering method for mullite ceramics, which can overcome the disadvantages of large sintering shrinkage and complicated process in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 3 moles of aluminum nitrate and 1 mole of ethyl orthosilicate, add them to 3 moles of ethanol, mix well after stirring, and seal at room temperature for 3 days. Weigh 72 grams of α-alumina powder, join in 100 grams of silica sol, SiO in this silica sol 2 The content is 28wt%. An appropriate amount of mullite single-phase gel is weighed and added, and the weight of the theoretical component mullite in the mullite single-phase gel accounts for 2% of the mixture. Mix well and dry and press into rectangular blocks, then sintered. Insulate at 1250° C. for 2 hours, then at 1400° C. for 2 hours to obtain a mullite ceramic block with a porosity of only 10%.

Embodiment 2

[0016] Weigh 3 moles of aluminum nitrate and 1 mole of ethyl orthosilicate, add them to 3 moles of ethanol, mix well after stirring, and seal at room temperature for 3 days. Weigh 72 grams of α-alumina powder, join in 100 grams of silica sol, SiO in this silica sol 2 The content is 28wt%. An appropriate amount of mullite single-phase gel is weighed and added, and the weight of the theoretical component mullite in the mullite single-phase gel accounts for 5% of the mixture. Mix well and dry and press into rectangular blocks, then sintered. Insulate at 1300°C for 1 hour, then at 1400°C for 1 hour to obtain porous mullite ceramics with a porosity of 25%.

Embodiment 3

[0018] Weigh 3 moles of aluminum nitrate and 1 mole of ethyl orthosilicate, add them to 3 moles of ethanol, mix well after stirring, and seal at room temperature for 3 days. Weigh 72 grams of α-alumina powder, join in 100 grams of silica sol, SiO in this silica sol 2 The content is 28wt%. An appropriate amount of mullite single-phase gel is weighed and added, and the weight of the theoretical component mullite in the mullite single-phase gel accounts for 2% of the mixture. Mix well and dry and press into rectangular blocks, then sintered. Insulate at 1300° C. for 2 hours, and then at 1400° C. for 3 hours to obtain a mullite ceramic block with a porosity of 5%.

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Abstract

The low temperature mullite ceramic sintering process features that the alcohol solution of aluminum nitrate and the alcohol solution of ethyl silicate are mixed to prepare monophase mullite gel, and the gel is dried and sintere3d at 980-1000 deg.c to convert into mullite. The gel is added into the material for baking mullite ceramic homogeneously and converted into mullite distributed homogeneously in the mullite ceramic material like crystal seeds, so as to promote sintering, lower the sintering temperature to 1400 deg.c, 200 deg.c lower than traditional sintering temperature, and lower the power consumption greatly.

Description

1. Technical field [0001] The invention relates to a low-temperature sintering method for ceramics, in particular to a low-temperature sintering method for mullite ceramics. 2. Background technology [0002] Mullite ceramics have high melting point, small thermal expansion coefficient, creep resistance and thermal shock resistance. With high creep resistance, it has a wider range of uses, and can even be used as a thermal structural material in the aerospace field. However, there are very few natural mullites, and most of them are obtained by reaction sintering of alumina and silica. The traditional method is to sinter the reaction of industrial alumina and silica sol. The firing temperature of mullite is as high as 1600°C, which consumes a lot of heat energy. Today, when energy is increasingly scarce and the country implements a conservation-oriented economy, high energy consumption is no longer suitable for social development. need. If mullite is synthesized by chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/185
Inventor 陈照峰李敏李聪严波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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