Researches on Alloy form Characteristic Based on Gypsum Molding

ABSTRACT

With the rapid development of economic, gypsum is widely used in casting and other industry areas. In this paper, the result is obtained that the performance of plaster mold is better when gypsum-water ratio is 0.5. If the composition of gypsum slurry mixture (β=α-hemihydrate, mullite powder, zirconium powder, reinforcing fibers) is mullite powder: zircon flour: enhancing fiber = 1:0.25:0.2:0.02-0.04, the mixture will be optimum property. The temperature influencing on bending-strength of plaster and the influence of gypsum-water ratio, filler types and calcination temperature on gypsum bending-strength has been analyzed by means of experiments. Spiral-shaped gypsum mold was made by gypsum molding material and mobility experiment was conducted on Pb-Sn alloys. Compared with pure gypsum, gypsum mixture had better mechanical properties. The fluidity of the alloy in the gypsum mold was effected by casting pressure, pouring temperature and alloy ratio. The research results have benefit to the application of gypsum casting technology.