Production of porous ceramic



PROBLEM TO BE SOLVED: To prevent the generation of crack and fracture in the sintered body and to obtain the desired porosity in the sintered body by adding and dispersing hollow resin beads in the slurry containing a gelling agent and ceramic powder, curing the gelling agent and heat-treating the formed body to form pores at its inside. SOLUTION: The method can be applied to a ceramic material such as silicon carbide, mullite and alumina. Various materials such as polystyrene, and polyethylene are used as the resin material of the hollow resin beads. Epoxy resin, polyvinyl alcohol, phenolic resin, urea resin, melamine resin, and urethane resin are used as the gelling agent. The hollow resin beads having 1-10 mm average grain size and 50-99 vol.% volume ratio of hollow part is preferable. The hollow resin beads are blended so that it may be 2-70 vol.% of the formed body. The ceramic sintered body having a desired porosity can be produced by regulating a rate of addition of the hollow resin beads.
(57)【要約】 【課題】 所望の気孔率を有する多孔質セラミック成形 体を繰り返して製造することが可能で、しかも、分解ガ スや燃焼ガス発生を抑制して、成形体にクラックや割れ などが発生することを防止することが可能な多孔質セラ ミック成形体の製造方法を提供する。 【解決手段】 ゲル化剤とセラミック粉末を含有するス ラリーに中空樹脂ビーズを所定の割合で添加して分散さ せたセラミック原料スラリーを、ゲル化剤を硬化させる ことにより所定の形状に成形した後、熱処理して中空樹 脂ビーズを分解、除去し、成形体の内部に気孔を形成す る。




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