| 摘要 |
PROBLEM TO BE SOLVED: To obtain ceramics having a nearly prescribed shape with slight deformation by disposing a heat resistant jig having a prescribed shape in a hollow conical compact formed by compacting a powdery starting material, putting them in a firing furnace and firing the compact while supporting it by the jig. SOLUTION: A powdery starting material for ceramics is compacted through a high pressure liq. or the like to form a hollow conical compact 1 similar in shape to a product. This compact 1 is disposed on a plate 5 and a heat resistant jig 3 whose shape coincides with the inside shape of the compact 1 after firing is disposed in the compact 1. The material of the jig 3 is required not to cause deformation and reaction with the compact at a high firing temp. The plate 5 is put in a firing furnace and the compact 1 is fired by heating. Even if the compact 1 is deformed by ununiform heat conduction from a heat source during the firing, the fired compact in a hot soft state is formed in the shape of the jig 3 by gravity and the objective ceramics 2 having a prescribed shape is obtd. with slight deformation. |
