The test of removing EPS pattern (the density is 0.05~0.08g/cm3) at various temperature for ceiamic shell manufactured using bauxite, mullite and gangue coating bonded silica sol was carried out. The results indicate
that at 300~1000℃, a large quantities of the ceramic shells were cracked,
but at 100~200℃, the ceramic shells weren't cracked. Based on analysing temperature-dimension characteristic of EPS pattern and the dehydration contraction of ceramic shell, the reason of ceramic shell c...