| 摘要 |
PURPOSE:To inexpensively produce a piezoelectric ceramic with the piezoelectric characteristic and strength improved and their variance reduced. CONSTITUTION:A piezoelectric ceramic compact is sintered in the presence of the lead-atmosphere powder and oxygen-atmosphere powder to produce a piezoelectric ceramic. The oxygen-atmosphere powder consists of an peroxide inert to the piezoelectric ceramic compact and is arranged under or around the compact as the seat powder or covering powder. Since the oxygen- atmosphere powder is inert to the compact, the piezoelectric characteristic and strength are not lowered. Meanwhile, as oxygen is generated from under or around the compact, a uniform oxygen atmosphere is formed around the compact, and the sintered compact is densified to improve and uniformize its piezoelectric characteristic and strength. The peroxide liberates oxygen in sintering and recombines with oxygen when cooled to form the reusable peroxide. |
