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金属型型腔涂料的主要目的是调节铸型的热规范,控制金属液在铸型内的冷却速度,防止型腔表面直接与金属液起作用,延长金属型的使用寿命。为此,要求涂料具有一定的耐火度和良好的保温性、导热性,不应含有与金属液起化学反应的物质。其次希望它有足够的流动性,便于均匀地喷涂(或涂刷)型腔表面;有一定的粘附性,不因温度急变而产生龟裂及剥落;对于镁合金金属型铸造的涂料应具有防止合金氧化的性能;
The main purpose of the metal cavity coating is to adjust the thermal specifications of the mold, to control the cooling rate of the molten metal in the mold, to prevent the surface of the cavity from working directly with the molten metal, and to extend the service life of the metal type. To this end, the paint is required to have a certain degree of fire resistance and good thermal insulation, thermal conductivity, should not contain a chemical reaction with the metal liquid material. Secondly, it is hoped that it has enough fluidity to spray (or brush) the cavity surface evenly, a certain degree of adhesion, no cracking and spalling due to rapid temperature change, and a Prevent oxidation of the alloy performance;