| 摘要 |
PURPOSE: To obtain a spherical body for game easy to maintain and handle, which is not magnetic and moreover, generates no rust, by sintering a spherical molded product made of ceramics. CONSTITUTION: Material ceramics are preferably 3-0.1μm in average particle size. In the case of zirconia, a method herein used is that an ultrafine grain sol of zirconia is generated by thermal hydrolysis to calcine it. In the molding of the material ceramics, the material ceramics are mixed with molding assistants such as binder, lubricant, plasticizer, defloceulant, wetting agent or water preserving agent. In the molding of a mixture, a cast molding method, an injection molding method employing a die with a spherical internal surface and the like are applicable. A spherical molded product thus obtained can be sintered to obtain a desired ceramic spherical body for game.
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