γ-TiAl金属间化合物的成形工艺是材料成形领域的前沿领域和研究热点.本研究采用水冷铜坩埚真空感应凝壳技术和熔模型壳离心浇注的铸造方法制备γ-TiAl增压涡轮,通过改善冒口工艺获得了健全的γ-TiAl涡轮铸件,分析了γ-TiAl增压涡轮的凝固过程和收缩缺陷产生原因.结果表明,增大冒口与铸件的模数之差以及冒口与铸件的体积之比有利于减少及消除涡轮铸件的收缩缺陷.为给数值模拟研究提供热物性参数,针对涡轮铸件用钛铝合金,实验测试了合金的热膨胀系数、比热和热导率等物性参数,其与温度的关系分别为:αl=8.10651+0.0073T-2.97619E-6T2;CP=668.28158-0.013T+1.11905E-4T2;λ=19.82252-0.02781T+6.51497E-5T2-3.21096E-8T3.
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