Diatomite Casting Coating And Process Research

In the course of metallic casting，coating technology is a key factor, the quality of coating directly affects problems like the die life, the coating quality and the productivity. The physicochemical properties such as gas evolution, bentonite and microstructurewere tested in this topic, and then from which the raw materials suitable for metal type coating were selected; In terms of coating preparation, the rolling method and mixingmethod were compared; After completion of coating preparation, the suspension properties, gas evolution, surface strength(200℃), rheological behavior and thermal insulation properties (720℃) were tested, the impact of the raw materials on performances of coating was also studied, then the proportion of coating was optimized; In production practice, taking the centrifugal casting for example, the use effect of paint was optimized and tested by controlling the casting process parameters, finally, it was recognized by the enterprises, and applied to the production.Research shows that: Refractory products such as diatomaceous earth, bonder andsuspending agent all have an important effect on the properties of coating. Technological parameters such as casting process parameters, mold temperatures, viscosity of coating, coating thickness are important guarantee for coating can exert function normally.In addition，whether preparation technology of coating is appropriate directly influences suspension property, rheological property and thixotropy of the coating, which is closely related to the surface quality of casting.The test results show that using diatomaceous earth with20%PS5+80%TST8B asrefractory product,8%domestic bentonite clay as suspending agent,3.5%aluminumphosphate as binder; Rolling method is used to prepare coating; Casting process parameters is T4viscosity9.73, discharge volume is253g/20s, one-step painting, mold temperature is230℃; Cast of the moment without imperfections such as needle, potholes, bitted surface, white cast, slag inclusion the casting surface is smooth.