| 摘要 |
PURPOSE:To make a slurry invade enough even a narrow air-gap part in a short time at the time of coating, by immersing the lower side part of a tree made of a brazing filler metal, which has been provided with a product model on the periphery, into a refractory slurry under a reduced pressure, rotating a transverse gate stick around an axis with regard to said tree. CONSTITUTION:Under an atmospheric pressure, a tree 15 is overhung and supported in a state that a gate stick 18 part has been leveled, and by closing a cover 5, the inside of a vacuum container 1 is brought to pressure reduction to about 100Torrs. Subsequently, the tree 15 is rotated one - several time at a speed of an extend that it makes one rotation per 10sec, and thereafter, by opening an escape valve 9, the inside of the container 1 is returned to the atmospheric pressure. Next, by opening the cover 5 and taking out the tree 15, a slurry adhering part whose refractory slurry has invaded enough even the inside of a narrow space part 19a is obtained. In this way generation of a space part in a coating layer can be prevented, and generation of a failure at the time of molding and at the time of casting by a lost wax casting method can be prevented. |
