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A porous ceramic which has fine porosity and small specific gravity is made with Cenosphere and Ball Clay under condition of 1,250°C in calcination temperature and 30 minutes of calcination time. The average size of porous ceramic was about 2.5 × 10 m and pores are well developed. The void-fraction of porous ceramic was 67.1% under the input of Cenosphere and Ball clay with the weight ratio of 100 to 5. However, as weight ratio of Ball Clay increased to 20, 40, 100, the void fraction decreased to 58.4, 56.7, 47% respectively. When the weight ratio of Cenosphere and Ball Clay was 100 to 100, the apparent density of porous ceramic was 1.04 g/cm. which is twice the density when the weight ratio of Ball Clay was 5. On the other hand, absorption rate decreased by at least 100%. In condition of weight ratio of Cenosphere and Ball Clay was 100 to 100, compressive strength of porous ceramic was 30 (MPa), improve by about 76% or more when the weight ratio of Ball Clay was 5.

Effect of Additive Ball Clay on Physical Properties of Porous Ceramic