| 摘要 |
PURPOSE:To manufacture a porous layer core part for dental porcelain frame without cracking by putting a ceramic powder starting material on a fire resisting model, and partially covering its surface with a thermosetting resin. CONSTITUTION:Water is added to an alumina powder starting material having an average particle size of 3mum to form a slip, which is then casted onto a gypsum fire resisting model, a water-soluble phenol resin is put thereon 0.2-0.3mm thick to form a ceramic core part. This is raised in temperature to 1100 deg.C in 30 minutes, held for 10 minutes, and then baked. The fire resisting model is contracted because the composition water is partially lost by baking, and separated from a porous layer core part. In the ceramic material, for example, a ceramic powder such as alumina or zirconia is used as the main starting material, and a metal powder such as gold or a glass powder is mixed thereto as occasion demands. The examples of the applicable thermosetting resin include phenol resin, urea resin, unsaturated polyester, epoxy resin, and mixtures thereof. |
