Preparation method of silica alumina gel bonding agent for corundum-mullite composite ceramic

A technology of gel binder and composite ceramics, which is applied in the field of preparation of silicon-alumina gel binder for corundum-mullite composite ceramics, and can solve the problems of inability to apply, high cost of silicon-alumina gel, and difficulty in industrialized production and application. and other problems to achieve the effect of speeding up the gelation time, improving the performance of ceramics, and promoting the improvement of

Inactive Publication Date: 2005-09-21
ZHEJIANG UNIV
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  • Claims
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Problems solved by technology

[0005] At present, there are few commercially prepared silica-alumina gels, and only individual alumina gels or silica gels are available. The commonly used silica-alumina gels are prepared by a sol-gel method, and are prepared by hydrolysis and polymerization of

Method used

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  • Preparation method of silica alumina gel bonding agent for corundum-mullite composite ceramic
  • Preparation method of silica alumina gel bonding agent for corundum-mullite composite ceramic
  • Preparation method of silica alumina gel bonding agent for corundum-mullite composite ceramic

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[0019] Add aluminum glue (10-20wt% alumina) to a container of deionized water (pH 2.5) acidified with acetic acid for dilution, and stir to prepare an aluminum sol with an alumina content of 5%. The silica sol (the silica content is 18 wt%) is diluted by adding deionized water, and the silica sol is stirred to prepare a silica sol with a silica content of 5% for use. Stir and reflux the aluminum sol in a reactor at 80°C for half an hour, cool to 40°C and add a certain amount of silica sol with a silica content of 5% according to the mullite ratio, stir while adding, and control the PH value ≤ 3. The stirring time is 2 hours to prepare silica-alumina sol, and then prepare silica-alumina gels of different concentrations by dehydration. Adding ammonia or organic base 3-aminopropanol can speed up the gelation time of silica-alumina sol, and adding acetylacetone can delay silica-alumina sol. The gel time.

[0020] Table 1 shows the gelation of aluminum silica sol under different pH con...

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Abstract

The invention discloses a method for producing an alumina silica gel anchoring agent for corundum mullite composite ceramic, which comprises: using silicasol and alumina colloid as raw materials, controlling PH of the alumina colloid, using sol-gel processing to produce the alumina silica gel, controlling the content of alumina silica by dewatering in the alumina silica gel producing process, and controlling the gelling time by adding ammonial solution or acetylacetone, controlling the crystal system of mullite phase produced from burning process of the alumina silica gel by adding the aluminun trifluoride mineralization agent. The alumina silica gel can be used in the ceramic and fire resistive materials producing process as the anchoring agent, also can be used in production of mullite super fine. The crystal form can be controlled by adding the mineralization agent to improve the capacity of the ceramic and fire resistive materials.

Description

technical field [0001] The invention relates to a bonding agent for firing ceramics, in particular to a method for preparing a silica-alumina gel bonding agent for corundum-mullite composite ceramics. Background technique [0002] Binders in ceramic and refractory products can be divided into temporary binders and permanent binders according to their existence time: the former decomposes due to temperature rise during sintering or use of the product, volatilizes and leaves the product, and its remaining part is no longer suitable for use. The product may rarely affect the performance of the product; the latter will remain in the product permanently during sintering and use, and will inevitably have an impact on the performance of the product. This kind of permanent binder is often divided into two types that change and do not change during sintering or use. Generally speaking, most binders will reduce the high-temperature performance of the product. For high-temperature cer...

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Application Information

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IPC IPC(8): C04B35/10C04B35/185C04B35/624C04B35/63
Inventor 王家邦杨辉茅宇雄陈桂华
Owner ZHEJIANG UNIV
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