形状复杂的陶瓷体成形需采用近净形工艺。粉浆铸造已成功地用于某些陶瓷生产,然而对细粒状的Si_3N_4粉而言,由于细孔隙结构的铸造si_3N_4(典型孔隙半径为30～100nm)会引起一种附加的渗透阻力,这种阻力妨碍着较粗样品的制取,因此在铸造中就需要使用一种辅助压力。文中还报道了含Y_2O_3/Al_2)_3的Si_3N_4的压力制坯工艺。 调压铸造在直径6cm的圆筒形玻璃容器中进行, The shape of the complex ceramic body forming near net shape process required. Slurry casting has been successfully used in some ceramic production, however, for fine-grained Si 3 N 4 powders, an additional penetration resistance is induced due to the fine-grained Si 3 N 4 (typical pore radius 30 to 100 nm) Resistance hinder the preparation of coarser samples, so the casting requires the use of a secondary pressure. Also reported in the paper Y_2O_3 / Al_2) _3 of Si_3N_4 pressure billet process. Pressure-regulating casting was carried out in a cylindrical glass container having a diameter of 6 cm,