Investment Casting Sand for Casting Precision Parts of Mobile or
Plane
What is investment casting?
Investment casting, also called lost-wax casting, makes parts from
molten metal, usually stainless-steel alloys, brass, aluminum, and
carbon steel. The first step in the process is to build a wax
version of the final product. This can be done in one of three
ways:
1. Form a gelatin mold around a solid, 3D model of the final
product.
2. Create a metal mold of the final product, and then fill it with
hot wax.
3. Carve and machine a replica of the product out of wax.
To cast several parts at once, several wax patterns can be
assembled into a tree with wax runners and sprues carefully
connecting them. The “tree” is then repeatedly dipped in a ceramic
slurry that hardens when it dries. After receiving several layers
of ceramic that are allowed to harden, the tree and its patterns
are heated to remove the wax. The wax in the sprues and gates also
flows out of the tree and forms tubes and pipelines for molten
metal to follow and completely fill the mold.
Molten metal is poured into the now-empty mold and left to
solidify. The ceramic mold, the investment, is destroyed to remove
the part(s).
Investment Casting Sand Introduction
Investment Casting Sand usually refers to Mullite, as aluminum
silicate refractory, is generally used in stainless steel precision
casting process. The higher the aluminum content and the lower the
iron content in the mullite, the better the quality of mullite
products. Mullite is made of kaolin by high temperature sintering.
Mullite sand generally has 8-16 mesh, 16-30 mesh, 30-60 mesh, 60-80
mesh, 80-120 mesh; mullite powder generally has 200 mesh, 300 mesh,
etc.
The usual components of Mullite sand:46%≥Al2O3≥42%,53%≥SiO2≥51%,1.2≤Fe2O31≤1.5%,Na2O+K2O≤0.3%,CaO+MgO2≤0.6%,TiO2≤0.1%.
Advantages: the casting of pouring is easy to be shelled, not
deformed, not easy to shrink, with good finish and high ratio of
finished products.
16-30mesh 30-60mesh 200mesh
