The Effect of the Pressure and Chills on the Solidification of Thin-Section and Complicated Aluminium Casting with Plaster Mold in Counter-Pressure Casting;

Rapid Drying Method for Plaster Mold;

The tensile strength of the plaster mold at room temperature and drying process were studied,with the additiv of calcium oxide,polyacrylamide,methyl cellulose,glass fiber.

The present paper delt with the influence of several additives such as water reducing agent of N and colloidal silica on the performances including setting time and strength and absorption rate and attack rate of modle gypsum,.

After correction,all the patterns were evaluated,so the best pattern was chosen and compared with the plaster cast and the relationship could be found.

The article analyzed the factors affecting the working life of plaster mould during the period from preparation to application and emphasized the importance of extending the working life.

This paper deals with the effect of adding polyvinyl alcohol (PVA),polyvinyl formal (PVA) and methyl cellulose (MC) on the performance of plaster mould.