Using TTIP as a starting material, we investigated sol-gel fabrication of TiO2-coated carbon fibers, and op timized the following fabrication parameters: coating solution composition, pulling rate and dipping time. TG measurement results indicated that no weight reduction occurred in the coated fibers air up to at a high temperature of 1000•Ž. From these experiments, it was concluded that the fabricated carbon fibers coated with TiO2 were oxidation resistant.
Mullite porous bodies were produced by means of simultaneous induction of a foaming reaction between aluminum powder and sodium hydroxide and a gel-set reaction between sodium aluminate, a binding agent, and sodium silicate The effects of aluminum lactate on the porosity and pore size of the porous bodies were investigated.The effects of the amount of aluminum lactate powder were most pronounced at 0.5 mass%, at which the maximum porosity was 50% and the mean pore size was 200m.In addition, the pore size of the porous bodies increased to 100-800m by the addition of aluminum lactate powder.
Foaming of green bodies is induced using an acrylic mold; namely, the green body is produced by two simul taneous reactions, a hydrogen generation reaction involving aluminum particles and sodium hydroxide, and a gelling and setting reaction involving sodium silicate and sodium aluminate. Foam formation ratio, porosi ty and pore size of green bodies are examined for various particle sizes and amounts of aluminum powder ad ded to mixed slurry for the evaluation of green bodies.
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