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

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...

AI Technical Summary

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 alkoxides. The sol, finally forms a gel, the cost of preparing silica-alumina gel is very high, it cannot be applied in the field of refractory materials or ordinary ceramics at all, and it is difficult to achieve large-scale industrial production and application

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