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Therefore, the proper fluidity should be controlled(carborundum abrasives). The mold material should be well wetted by the refractory coating and form a uniform covering layer. The coating property of the mold material can be measured by measuring the wetting angle between the investment mold and the binder(alumina suppliers). In addition, good reusability, convenient recovery, stable chemical properties, no pollution, rich resources and low price are required.

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If the ratio of paraffin to stearic acid is changed, the performance of the die will be affected(120 grit aluminum oxide blasting media); when the content of paraffin is increased by 10%, the strength of the die will be increased. The results show that the silica sol has good stability in the environment above 0 ℃, the edges and corners of the investment casting are clear, the dimensional accuracy can reach cT4 ~ 6(white aluminium oxide powder 320 grit), and the surface roughness can reach r.0.8um ~ 1.25um.

(cheap abrasive blast media manufacturers usa)The investment casting process is suitable for mass production due to the common use of metal pressure mold to make investment mold(100 grit aluminum oxide blast media); however, if the low-cost gypsum molding, fusible alloy molding or silicone rubber molding (commonly used in artwork and jewelry casting) to make mold, it can also be applied to small batch production or trial production(alumina company). The residue after the mold material is burned is called ash.

The mold material should have enough strength at room temperature to ensure that the investment mold will not be damaged and broken during the production process of mold making and shell making(low sodium white fused alumina); generally, the tensile strength of the mold material should be greater than 1.4mpa (= 14kg / EM) for small castings, and not less than 2.5MPa (* 25kg / cm) for large castings(pink fused aluminum oxide). Paraffin is the basic component of the mold material.(cheap abrasive blast media manufacturers usa)

In order to meet the requirements of investment casting quality and production process(aluminum oxide blast media 60 grit), the comprehensive process characteristics of the pattern material composed of the mixture can meet the requirements of investment casting quality and production process(aluminium oxide manufacturers). This kind of mold material has low melting point, convenient preparation, easy mold preparation and dewaxing, It has high recovery rate and good reusability.

(cheap abrasive blast media manufacturers usa)As the result of saponification reaction will consume part of stearic acid in the pattern material(120 grit aluminum oxide), new stearic acid should be added when the pattern material is reused to stabilize the performance of the pattern material. The common mold materials can be divided into(aluminium oxide powder price): wax based mold material, resin (rosin) based mold material, series of commercial mold material, filler mold material, water-soluble mold material, etc.

The effect of adding stearic acid is that the molecule of stearic acid is polar molecule(150 grit aluminum oxide), which has good wettability to the coating, which can improve the coating property of the mold material and improve the thermal stability of the mold material. The liquid paraffin and stearic acid have good mutual solubility(black corundum price). The preparation methods of silica sol include ion exchange method, acid neutralization method and dialysis method.(cheap abrasive blast media manufacturers usa)

The welding method is mostly used in the investment mold combination(brown fused aluminum oxide manufacturers), so the mold material should have good welding performance and welding strength, so as to prevent the module from fracture at the welding point in the process of transportation and shell making(due to the small wetting angle to the coating). There are many kinds of pattern materials for investment casting(white fused alumina powder), which are generally composed of many kinds of raw materials.