| 摘要 |
PURPOSE:To produce the subject ceramic improved in the strength and low heat-conductive characteristics from a composition comprising all the elements of Si, N, O, etc., and an element or more selected from a group of Ti, Nr, etc. CONSTITUTION:A mixture containing the powder of Si, N and O as main elements and further containing an element or more selected from a group of Ti, Zr, Hf, Y, B, and A'l' in an amount of >=5wt.% is molded. The molded product is sintered in a nitrogen atmosphere to form a porous nitride, which is heated in an atmosphere containing oxygen to partially convert the nitride into an oxide. The formed porous ceramic 1 is immersed in an alkoxide solution or an organic polymer solution, and subsequently heated to produce a low heat-conductive ceramic in which an amorphous ceramic 5 is adhered to approximately 20.1% of pores 3 in the ceramic and further in which the second phase particles 7 are formed. |
