Fabrication of polymer derived silica bonded alumina ceramics

Abstract

Present work focuses on the polymer derived silica bonded alumina ceramics. Sintering has been done at 1500oC and 1600 oC. The alpha-alumina phase of (305 nm from ALMATIS&449 nm of TRL alumina) micron particle size has been used as starting material. Along with Polymethylsiloxane or puresilica is added with isopropylalcohol. The study of the densification of pellet at varying soaking time of 1, 2, 4, and 6 hours has also been carried. For better densification mixing is done under magnetic stirring. The microstructure of the sintered body is analyzed and densification due to a grain growth has been observed. We are successful to minimize the porosity up to 0.7% and preparing a dense product. The Vickers hardness test has been carried out for testing of mechanical property and was found to have good hardness value.