Effective control of blowhole defects in lost foam cast iron parts can be solved with the following points:
1. Choose the right model material
Since a copolymer foam is used as a model material and the copolymer is decomposed by a zipper, the degree of gasification at one time is high, the ratio of a liquid phase is small, and a low molecular gas easily overflows from the coating. The density of mildew is kept as low as possible under the premise of strength and smoothness to reduce the total amount of gas. More stable.
2. Improve the air permeability of the coating
The particle size of the refractory aggregate must be suitable.The composite suspending agent binder is used, the compounded coating has high and low temperature strength, abrasion resistance, easy to brush, no cracking, exhaust capacity It is large, has good air permeability, is uniform in sintering, and is unpacked. It is easy to peel and peel without getting wet or chemically reacting with metallic liquids.
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