| 摘要 |
PURPOSE:To improve the precision in detecting an indicated temp. by using the unsintered formed body of the ceramic Al2O3 having a specified content of SiO2 as the formed body by detecting the heat history in the sintering of ceramic, etc. CONSTITUTION:This formed body 10 for detecting a heat history contains >99.7 wt.% Al2O3 and < 0.2 wt.% SiO2 and is obtained by press forming, and the grain diameter of the raw powder, green density of the formed body, etc., are strictly controlled. The sintering temp, is changed under given conditions, the size of the sintered formed body 10 is measured, and the relation between the size and sintering temp. is prepared as a conversion table. When a formed body is sintered under different conditions, the formed body 10 is sintered along with a body to be sintered, the size of the sintered body is measured, and the indicated temp. is obtained from the table. |
