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在镍基高温合金单晶叶片精密铸造用型壳中添加短切碳纤维,制备了短切碳纤维改性复合型壳,研究了纤维含量对型壳中温、高温线收缩率及高温自重变形的影响。结果表明:随着碳纤维含量的增加,型壳试样的中温、高温线收缩率均减小,型壳试样的高温线收缩率显著大于型壳中温线收缩率;添加短切碳纤维对型壳抵抗高温变形的能力都有一定的提升,随着碳纤维含量的增加,型壳试样的高温自重变形率先减小后增大。碳纤维含量为4 g/L时,型壳的高温自重变形率最低,降至0.81%。
The chopped carbon fiber was added into the shell of the Ni-based superalloy single crystal leaf casting mold to prepare the modified composite shell with chopped carbon fiber. The effects of fiber content on the shrinkage and the self-weight deformation at high temperature were studied. The results show that with the increase of carbon fiber content, the shrinkage rate of the shell specimens decreases at mid-temperature and high temperature, and the shrinkage at high temperature of the shell specimens is significantly larger than that of the shell; With the increase of carbon fiber content, the deformation of high-temperature self-weight of the shell specimens first decreases and then increases. When the carbon fiber content is 4 g / L, the deformation rate of the shell under the highest temperature is the lowest, dropping to 0.81%.