Spherical Fused Silica Powder for Precision Casting CAS 7631-86-9, High-Temp Investment Casting Shell & Refractory
Spherical Fused Silica Powder for Precision Casting CAS 7631‑86‑9 is amorphous fused silica manufactured from high‑grade quartz through high‑temperature flame spheroidization, crushing removal of angular fragments and particle‑size classification. Spherical particle morphology optimizes refractory slurry rheology. It serves as key refractory raw material for investment casting shell making and related refractory products, enhancing thermal‑shock resistance of ceramic shell and minimizing shell c
Spherical Fused Silica Powder for Precision Casting CAS 7631‑86‑9, High‑Temp Investment Casting Shell & Refractory
This precision‑casting‑grade spherical fused silica powder is produced by melting high‑quality quartz at extreme temperatures, followed by flame spheroidization treatment, air classification and screening operations to eliminate angular grit. The resulting material consists of amorphous spherical SiO₂ particles. The amorphous microstructure features a low and stable thermal expansion coefficient, which is the core advantage for investment casting shell applications.
Conventional angular fused silica or cristobalite casting powders suffer from sharp volume expansion upon heating. Rapid temperature changes during dewaxing, pre‑heating and molten‑metal pouring easily trigger thermal stress inside the ceramic shell, leading to shell cracking, spalling and casting defects such as metal penetration. Thanks to the amorphous spherical structure, this product exhibits mild thermal expansion behavior and superior thermal‑shock resistance. It effectively reduces the tendency for ceramic shell to crack under drastic temperature fluctuation.
The smooth spherical particle shape improves the fluidity of refractory slurry when mixed with silica sol or ethyl silicate binder. Better slurry flow enables uniform coating on wax patterns, and the packing density of the dried shell layer is increased. Dense shell layers gain higher high‑temperature strength, which resists erosion from high‑temperature molten alloy during pouring. It is suitable for the surface coat, backup coat and stucco layers of lost‑wax investment casting shells for stainless‑steel, super‑alloy and aluminum precision castings.
Apart from investment casting shells, this spherical fused silica powder can also be formulated into other refractory materials, including high‑temperature castable refractory and refractory putty for foundry applications. It is not designed for semiconductor encapsulation or electronic substrate production, and electronic‑level impurity control is not mandatory for this casting grade.
During shell‑slurry preparation, proper mixing speed and mixing duration should be controlled. Excessive high‑speed stirring may fracture spherical particles and generate sharp angular fines, which will deteriorate slurry rheology and thermal‑shock performance of the final ceramic shell. Formulation technicians need to adjust particle‑size gradation to optimize shell strength and permeability. Improper particle gradation may cause poor gas permeability of the shell, resulting in blow‑hole defects on the metal casting surface.
The powder must be stored in sealed bags inside dry warehouse conditions. Moisture contamination will destabilize silica‑sol‑based refractory slurries and shorten the usable pot‑life of shell‑making slurry. During storage and material transfer, avoid cross‑contamination with electronic‑grade fused silica. This spherical fused silica powder is a dedicated high‑temperature refractory raw material for investment casting ceramic shells and foundry refractory products.
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