| 摘要 |
PURPOSE:To readily and inexpensively obtain a sintered material of high-purity zinc oxide having excellent light transmission properties by sintering zinc oxide powder in an oxygen existing atmosphere and sintering in an argon atmosphere under gas pressure. CONSTITUTION:Zinc oxide powder is sintered in an oxygen atmosphere or in air and then in an argon atmosphere under gas pressure to give the objective sintered material. Zinc oxide powder sold on the market or zinc oxide powder obtained by thermally decomposing a salt such as zinc oxalate to be decomposed by heating into zinc oxide can be used as the zinc oxide. Before sintering, first, zinc oxide powder is molded. The molded article is primarily sintered in an oxygen atmosphere or in air. The sintering is carried out at 1,000-1,400 deg.C for 1-100 hours. The sintered material having >=90% relative density is obtained by the primary sintering. Then, the sintered material is sintered in an argon atmosphere under gas pressure. Consequently, pores in the sintered material are extinguished and densification can be promoted. |
