Silica sol is a high quality binder commonly used in precision casting industry. The silica sol shell has high temperature strength and good surface quality. However, the silica sol shell has a low residual strength, which is less difficult to clean, and the shell is long. However, the strength and permeability of the cast silica sol are related to each other. The use of an increased shell thickness is often used to ensure the strength of the shell, resulting in difficulty in heat dissipation, large grain size, and poor air permeability through the permeability tester . , Must improve the pouring temperature of molten metal, making the shell and metal reaction to the extent of increased, greatly affecting the product surface quality, while the high temperature of the metal solution makes shell deformation serious, thus affecting the quality of casting. So far, domestic and foreign scholars to study the use of fiber as a reinforcement to join the metal matrix com...