近几年来,国内已广泛应用熔模铸造工艺来制造外形较复杂、表面较光洁的各种中小型精密铸件,高合金、贵重金属和用其他方法难以加工的一些零件以及拖拉机零件等。但是在熔模铸造中作为耐火涂料粘结剂的硅酸乙脂货源缺乏,价格又贵,因此它的代用是众 In recent years, the investment casting process has been widely used in China to manufacture various small and medium-sized precision castings, high-alloyed, precious metals and some parts that are difficult to be processed by other methods and tractor parts. But in the investment casting as a refractory coating binder silicate lack of supply, the price is expensive, so it is the public