Water glass composite shell VS Silica Sol shell investment casting for heat treament fixtures
you confused what’s water glass composite shell investment casting? You may
know there are two main processes for investment castings: water glass shell
and silica sol shell. Today let’s discuss water glass composite shell
you are not familiar with investment castings, you can refer my previous
glass shell temperature resistance is low, it’s suitable for carton steel
castings, as the temperature of molten carbon steel is about 1450°C. Molten
heat resistance steel is more than 1600°C，the water glass shell will be broken if use it to pour heat
resistance steel shell castings, and the material of water glass shell will
react with the alloy in heat resistant steel. So water glass shell can’t
be used to produce heat resistant steel castings. But water glass shell is much
cheaper than silica sol shell, after years of production experience, we
successfully developed a cost-effective process for heat resistance steel
fixtures: Water glass composite shell.
is the main difference for Water glass composite shell and Silica Sol shell
Outer surface: Silica Sol shell casting surface is better
Water glass composite shell castings, when making shell, silica sol shell is
used on the first layer (face layer) and second layer (transition layer), water
glass shell is used from the third layer, until the desired shell thickness
achieved. As the first and second layer are very thin, so the casting surface
is not as better as Silica Sol shell castings.
Dimension accuracy: Silica Sol shell castings dimensions are more accurate
shrinkage rate of water glass shell is higher than silica sol shell, wax used
in water glass composite shell casting is low temperature wax, it’s medium
temperature wax used in silica sol shell casting. The shrinkage rate of low
temperature wax is higher than medium temperature wax, as a result, the casting
dimensions of silica sol shell casting are more accurate.
Price: Water glass composite shell castings are cheaper as water glass shell
material is cheaper.
Inner quality and life time of castings: Both casting process are the same.
Water glass shell investment casting is cost-effective for heat treatment
fixtures, Silica sol shell casting is suitable for customers who pursuit the
good appearance of castings.
Shinning Metals to check if your heat treatment fixtures are suitable for Water
glass composite shell castings.