Research on manufacturing high alumina porous ceramic sheets for kiln lining materials
Keywords:porous ceramic, kiln lining, high alumina, high temperature, combustible additive
High alumina porous ceramic sheets with Al2O3 content ≥ 95 wt.% have many excellent thermal properties such as high thermal resistance, good insulation and low shrinkage. Thus, they arevery suited for a kiln working at high temperature. Using combustibleadditive to create porous structure for materials is a method which has a lot of benefits such as being simple and easy to adjust pore content. This study has designed a raw meal of 92.5 wt.% alumina powder and 7.5 wt.% kaolin (A mixture), selected sawdust (B) as a combustible additive with a volume ratio ofA/B = 55/45. The sample after pre-sintering at 1300oC has a volumetricdensityof 1.22 g/cm3, shrinkage of 1.36 %, andacertain level of sintering. This resultsin a certain mechanical strength with cold compressive strength of 10.05 MPa, which is convenient for transport as well as sawing, cutting and assembling into the kiln lining. After the secondary heating at 1650oC, itsshrinkage increased slightly by approximately 1 %, volumetric density is 1.29 g/cm3, porosity is 55.49 % and cold compressive strength is 10.58 MPa. Theresult shows that it is feasible to fabricate a large size of high aluminaporous ceramic sheets for high temperature kiln lining materials.
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