kalemtaş, ayşe bursa teknik üniversitesi - mimarlık ve mühendislik fakültesi - metalurji ve malzeme mühendisliği bölümü, Turkey

Production of Porous Silica Based Ceramics via Strach Consolidation Method

27830

In this study, fabrication of cristobalite based porous ceramics was carried out via starch consolidation technique and sintering process was performed at relatively low temperatures. Si3N4 powder was used as starting material and as sintering aids boraxdecahydrate and a commercial kaolin was selected. Corn starch was used as pore forming agent. It was determined that light weight (0.83-1.08 g/cm^3) and highly porous (53-73%) ceramics were produced depending on the sintering conditions (sintering at 1000-1200^oC for 1 hour). Sintering was performed under atmospheric conditions and during the heat treatment procedure Si3N4 powder was oxidized to cristobalite phase and this was confirmed by XRD analysis. Microstructural analysis revealed that highly porous ceramics with a bimodal distribution of pore sizes, 80-100 μm and a few μm, were fabricated via starch consolidation technique.

734

Starch consolidation , Porous ceramics , Silicon nitride , Boraxdecahydrate , Cristobalite

Afyon Kocatepe University Journal Of Science an‎d Engineering

746