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What are the problems shell making technology of stainless steel precision casting?

by:XEX     2021-03-06
Stainless steel castings' target='_blank'>precision casting is a less cutting or no cutting casting process, is an excellent technology in foundry industry, its application is very extensive. Stainless steel precision casting shell making technology of the main problems are as follows: 1. Due to the back layer kept sodium silicate binder, so its shell overall high temperature strength, creep resistance, lower than the silica sol shell casting dimension accuracy of castings and shape tolerance than silica sol shell. 2. Permeability is less than sodium silicate shell silica sol shell, shell type high temperature strength less than silica sol shell, easy to cause waste. 3. Composite shell casting quality stability is better than sodium silicate, but is much less than the silica sol shell. 4. The composite shell medium temperature wax material cannot be used. Medium temperature wax cannot use hot water dewaxing. 5. Composite shell with high price zircon powder surface, its shell cost is one type of sodium silicate shell type 4. 5 times, if the back layer USES the mullite sand powder, its shell is almost the same cost and silica sol shell, its low cost advantage is not obvious.
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