Archimedes method was used to test the density of sintered samples

and the effects of the argil on sintering behavior of the coating for evaporated pattern casting（EPC） cast steel were investigated through measuring density of sintered samples by Archimedes method.The results show that with increasing in the argil content and in the sintering temperature

the volume density of the samples is increased.The volume density of the sample is increased significantly with 5% argil content at 1 550 ℃

meeting the requirements of the coating for evaporated pattern casting cast steel.The practical pouring experiment was conducted to verify the coating behavior.The coating layer cross-section was observed by scanning electron microscope（SEM）.The results reveal that good sintering layer contacting with steel sintered can be observed

where refractory is aggregated into a whole piece to prevent the further penetration of molten steel

so that the coating easily stripped from the casting surface automatically.