IntroductionPreceramic polymer pyrolysis process has appeared in late 20th century as a new route for the fabrication of porous oxide and non–oxide ceramics. It offers many advantages, including low processing temperature, controllable ceramic composition and structure, and processing versatility. According to pore forming principles, porous ceramic fabrication process can be classified into three different categories: direct blowing, sacrificial templating, and replica technique. In direct blowing technique, porous ceramics are fabricated by blowing certain amount of air/gas into the precursor solution/slurry. Removal of the trapped air bubbles at higher temperature creates pores in the solid structure. Notwithstanding the many studies performed in the past, direct blowing technique imparts a gradient porosity in the porous bodies along the direction of blowing, which results in large variation in compressive strength, flow, and other functional properties. In sacrificial templating technique, microsized sacrificial agents are mixed with the solid precursor and heat treated to fabricate porous ceramics. It is best suited for producing a specific size of pore, and the overall porosity in the body is governed by the size distribution of sacrificial agents. Nevertheless, it becomes difficult to disperse sacrificial agents uniformly, and agglomeration of the pore formers often leads to a wider
Advanced Engineering Materials – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ;
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