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1.对高温壳型的要求 航空发动机的发展曾大大推动熔模铸造工艺的进步,而定向凝固的研究又对熔模铸造提出了新的要求,首先对壳型提出了更高的要求。如果说普通熔模铸造时壳型实际上只在1300℃受热几分钟,那么定向凝固就要求一种高温壳型,能在1500～1600℃工作40～90分钟。此时要求壳型不发生裂纹、鼓胀和漏钢,不产生显著的真空挥发,不发生严重的型腔反应,以便能顺利完成定向凝固过程,浇注出精度光度
1. The requirements for high temperature shell Aeroengine development has greatly promoted the progress of investment casting process, and directional solidification research has put forward new requirements for investment casting, the first shell put forward higher requirements. If a shell is actually cast at 1300 ° C for a few minutes during normal investment casting, directional solidification requires a high-temperature shell that can work for 40-90 minutes at 1500-1600 ° C. At this point the shell requires no cracking, bulging and steel leakage, does not produce significant vacuum evaporation, no serious cavity reaction in order to successfully complete the directional solidification process, pouring precision photometric