| 摘要 |
PURPOSE:To obtain a preferable piezoelectric ceramics by filling specific powder together with sintered material in a refractory container, and forming hot hydrostatic pressure in inert gas atmosphere, thereby preventing evaporation of oxidized lead from the ceramics and removal of oxygen. CONSTITUTION:A piezoelectric ceramics containing oxidized lead is sintered as a sintered material in atmosphere to the density at 92% or higher in theoretical density, filled in a dense refractory container, then one or more of powders of melting oxidized aluminum, oxidized zirconium, oxidized magnesium are filled in the container in 50-300mum of particle diameter, and hot hydrostatically treated with high temperature and high pressure gas (HIP). The oxidized lead vapor produced from the surface of the porcelain is heavier than the inert gas, and the periphery of the porcelain is enclosed densely with chemically stable powder. Accordingly, a convection with the inert gas hardly occurs, the removal of the oxidized lead and oxygen is extremely small, thereby manufacturing uniform and high density ceramics. |
