Abstract: Additives(PEG and PVA) were added into AlOOH sol which was prepared with SB powder as raw material and HNO3 as dispergator. The prepared AlOOH sol will be used as a coating modifier for the porous ceramic substrate. The influence of additive on AlOOH sol viscosity was investigated. The change of specific surface area of Al2O3 coating on porous ceramic substrate caused by the addition of additive to AlOOH sol was measured by BET method. The SEM photographs were used to study the shape of the surface and cross-section of ceramic substrate with Al2O3 coating. The fastness degree of coating was determined by ultrasonic vibration. The results show that additive with certain concentration leads to increase the AlOOH sol viscosity, however，too much additive causes sol gelation. The specific surface area of Al2O3 coating with additive increases at least 5 percent more than that of without additive. Moreover, on the porous ceramic substrate the Al2O3 coating prepared with additive is uniform and firm.
Key words: SB powder; AlOOH sol; additives; porous ceramic substrate; Al2O3 coating
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