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    Silica sol casting

  • Category:
    SILICA SOL CASTING
  • Browse number:
    18
  • Release time:
    2020-01-03 13:40:10
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Silica sol castings are mainly used for products with high corrosion resistance and precision dimensions, since silica sol steel casting can have much better surface quality and less geometrical deviation of dimensions. The main silica sol steel castings we ever made include meat grinder parts, valve castings, pump castings, marine hardware, and furniture decoration etc.


Usually, Silica sol casting parts tolerance within GB/T6414, CT5~6, weight range from 20 grams to 50 kilograms, the surface finish is Ra6.3.


Silica sol casting

Silica Sol Casting vs Water Glass Casting


Both silica sol casting and water glass casting belong to investment casting or lost wax casting. So process of silica sol casting is almost the same as water glass casting. But silica sol investment casting process uses silica sol zircon sand as the molding material, which can stand temperature up to 2000 degree. 


Silica sol casting

The silica sol investment castings have better dimensions and surface quality, but just more expensive than water glass casting. Cost of silica sol casting is almost twice than the cost of water glass casting. Below are the main differences between solica sol casting and water glass casting.


Silica sol casting



Process

Silica sol casting

Water glass casting

Size tolerances

CT5-6

CT7-8

Machining

No or less machining

More machining

Material

Stainless steel

Carbon steel & alloy steel

Cost

high

 Low


Why Silica Sol for Investment Casting?

Silica sol casting


Silica sol is a kind of milky colloid. Since the colloid grains are minute (10-20micrometer) and have relatively large surface area, so they do not affect the natural color of materials to be covered. Silica sol is mutually soluble with water , but not with organic solvent. It can dissolve in a solution of alcohol or water mixed in any ratio. The distinguished feature is that with low viscosity, it can soak the places where water soaks, therefore, silica sol presents excellent dispersion and permeability when being mixed with other substances. When the moisture contained in silica sol is evaporated, the colloid grains firmly adhere to the material surface and the combination of silicon and oxygen is then formed between grains. It is a good adhesive. That is the main function of silica sol as an molding adhesive for stainless steel investment casting.


Silica sol casting


Silica sol castings are mainly used for products with high corrosion resistance and precision dimensions, since silica sol steel casting can have much better surface quality and less geometrical deviation of dimensions. The main silica sol steel castings we ever made include meat grinder parts, valve castings, pump castings, marine hardware, and furniture decoration etc.

Silica Sol Casting in Our Foundry

In our foundry, all the stainless steel castings are produced in solica sol casting. Stainless steel 304 and stainless steel 316 are the main material grades for solical sol castings. We can produce unit weight 0.01kg-50kg and mainly exported to international market like USA, Australia, Canada, South Africa, ect. Silica sol casting can be carried out for further machining.


Silica sol casting


Investment casting is one of the oldest manufacturing processes, dating back thousands of years, in which molten metal is poured into an expendable ceramic mold. The mold is formed by using a wax pattern - a disposable piece in the shape of the desired part. The pattern is surrounded, or "invested", into ceramic slurry that hardens into the mold. Investment casting is often referred to as "lost-wax casting" because the wax pattern is melted out of the mold after it has been formed. Lox-wax processes are one-to-one (one pattern creates one part), which increases production time and costs relative to other casting processes. However, since the mold is destroyed during the process, parts with complex geometries and intricate details can be created. 


Investment casting can make use of most metals, most commonly using aluminum alloys, bronze alloys, magnesium alloys, cast iron, stainless steel, and tool steel. This process is beneficial for casting metals with high melting temperatures that can not be molded in plaster or metal. Parts that are typically made by investment casting include those with complex geometry such as turbine blades or firearm components. High temperature applications are also common, which includes parts for the automotive, aircraft, and military industries. 


Investment casting requires the use of a metal die, wax, ceramic slurry, furnace, molten metal, and any machines needed for sandblasting, cutting, or grinding. The process steps include the following.


Silica sol casting

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