使用消失模生产精密铸造，铸铁件的含碳量接近于饱和，气相和精密铸造之间碳的浓度梯度很小，气相中的游离碳不易迁移扩散到铸件表面。因此浇注铸铁件时很少产生表面增碳。 Using precision casting mold production, the carbon content of iron castings was close to saturation, carbon concentration gradient between gas phase and the precision casting is very small, in the gas phase free carbon diffusion to the casting surface. So when casting cast iron parts, it seldom produces surface carbon. 对铸铁件来说，表面皱皮是最常见缺陷。因为游离碳不容易渗入铸件表层，而是沉积在精密铸造和铸型的表面。这浇注时，ＥＳ型和金属液接触，分解成气态、液态和Ｐ模固态三种成分。 For cast iron, the surface cruff is the most common defect. Because free carbon is not easily permeable to the surface of the castings, it is deposited on the surface of precision casting and cast. In this case, the ES type and the metal liquid are exposed to the gas, liquid and P. 气相主要由ＣＯ、ＣＯ：２、Ｈ、甲烷和苯乙烯及其衍生物组成；液相主要由苯、甲苯、苯乙烯和玻璃态聚苯乙烯等液态烃基组成；固相主要由聚苯乙烯热解形成的光亮碳和焦状残留物组。 The gas phase is composed mainly of CO, CO: 2, H, methane and styrene and their derivatives. The liquid phase consists mainly of liquid hydrocarbons such as benzene, toluene, styrene and polystyrene. The solid phase consists mainly of the bright carbon and the focal residue formed by polystyrene pyrolysis.