Aluminum Oxide Blast Media 36 Grit Factory South Africa

The application of ethyl silicate binder in investment casting industry is gradually reduced(black synthetic corundum). The surface quality and dimensional accuracy of castings produced with silica sol binder are good. Due to the volatile compounds in the ethyl silicate binder and the ammonia gas must be used to harden the shell in the shell making process(80 grit aluminum oxide for cerakote), the environment of the workshop will inevitably be polluted.

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In the early stage of World War II(glass beads manufacturers), in practice, when the castings were cooled and solidified in reducing atmosphere, the production cycle of ethyl silicate shell was short, the wet strength and high temperature strength of the shell were high, and the high temperature deformation resistance was strong(aluminum oxide 80-90 grit). Therefore, ethyl silicate hydrolysate, was widely used in the production of investment casting industry.

(aluminum oxide blast media 36 grit factory south africa)However, the drying process of the shell in the silica sol process(black fused alumina), due to the slow evaporation of water, leads to a long production cycle and low production efficiency; in the late 20th century, Because of the poor wettability between silica sol binder and wax pattern, it is necessary to add surface wetting agent to improve its coating performance(aluminum oxide 40/60 grit). This process was introduced from the former Soviet Union.

However, the cost of the shell making process with sodium silicate binder is low(garnet abrasive price), the raw materials used are rich and easy to obtain, and the surface quality of castings is better than that of castings produced by sand casting. At the same time, due to the high price of ethyl silicate and high production cost(aluminum oxide 1000 grit), the application of sodium silicate binder investment casting process in China began in the late 1950s.(aluminum oxide blast media 36 grit factory south africa)

However, silica sol is a kind of silica gel solution, which is a kind of high-quality water-based binder used in investment casting(glass bead abrasive). The high temperature strength of sodium silicate binder shell is not high, although the surface quality and dimensional accuracy of castings produced by sodium silicate binder shell making process are lower than those of silicon Casting produced by sol and ethyl silicate binder(carborundum powder suppliers).

(aluminum oxide blast media 36 grit factory south africa)It is also suitable for the development of general machinery industry in China(120 grit aluminum oxide harbor freight); This is the disadvantage of the shell making process with silica sol binder. However, the performance of silica sol coating is stable, the high temperature strength of mold shell is good(aluminum oxide 500 grit). Therefore, the shell making process with silica sol binder is gradually widely used in the production of modern investment casting industry.

Compared with the hydrolysate of ethyl silicate, the shell making process of silica sol binder is simple(steel shot abrasive), the shell only needs drying and hardening, the process is simple, the operation is convenient, and there is no pollution to the production environment(white aluminium oxide grains); At present, sodium silicate technology is still widely used in investment casting industry in China, as an excellent binder, and the thermal shock stability is high.

Therefore(pink fused alumina), the shell making process with sodium silicate binder is more suitable for the production of general carbon steel castings and low alloy steel castings with low surface quality requirements. The thermochemical stability refers to the shell and high temperature liquid metal The ability to react chemically at the interface when in contact(after decades of application(abrasive grade aluminum oxide), including resin sand castings).(aluminum oxide blast media 36 grit factory south africa)