【摘 要】
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Silica sol is one of the frequently-used binders in high-temperature resistingfibrous porous ceramics,but in the drying process,it can diffuse with water and influencethe uniformity of ceramics.To sol
【机 构】
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School of Material Science and Engineering,Key Lab of Advanced Ceramics and Machining Technology of
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Silica sol is one of the frequently-used binders in high-temperature resistingfibrous porous ceramics,but in the drying process,it can diffuse with water and influencethe uniformity of ceramics.To solve this diffusion problem and fabricate homogeneousfibrous porous ceramics,cationic starch was firstly introduced in mullite fibrous system.The effects of starch content and high temperature binder content on microstructure,physical and mechanical properties were also investigated.The results indicate that starchconsolidated mullite fibrous ceramics owned a homogeneous 3D skeleton structure,sincethe introduced starch can absorb both water and silica particles by gelatinization andensure the even distribution of binders.Compared with the mullite fibrous ceramicsfabricated without starch addition,starch consolidated ceramics owned bettermicrostructure and higher interior compression strength.Furthermore,both the starch andsilica sol content had great impact on the microstructure,density,porosity,thermalconductivity and compressive strength of the fibrous ceramic.
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