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研究了等离子旋转电极制备低温钛合金球形粉末的特性,采用热等静压成形工艺,制备低温钛合金粉末冶金材料,并对比分析了组织与性能。以低碳钢为材质,加工装配专用芯模,开展粉末冶金TA7ELI钛合金构件净成形技术研究,实现了大尺寸、薄壁、半封闭式火箭发动机低温转子高性能、高可靠性的整体净成形。结果表明:等离子旋转电极制备的低温钛合金球形粉末,具有非常高的球形度和振实密度,粒径分布可依据需求控制在一定范围内,非金属夹杂含量每千克不超过20个;粉末冶金低温钛合金材料性能全面达到同批次锻件性能水平,微观组织呈等轴状;粉末冶金低温钛合金氢泵叶轮已通过了发动机型号低温全程试车考核。
The characteristics of low temperature titanium alloy spherical powder prepared by plasma rotating electrode were studied. The hot isostatic pressing process was used to prepare low temperature titanium alloy powder metallurgy material, and the microstructure and properties were comparatively analyzed. Low carbon steel as the material, processing and assembly of special core mold, to carry out the powder metallurgy TA7ELI titanium alloy components of the net forming technology to achieve large-size, thin-walled, semi-closed rocket motor low temperature rotor high performance, high reliability of the overall net shape . The results show that the low-temperature titanium alloy spherical powder prepared by plasma rotating electrode has very high sphericity and tap density. The particle size distribution can be controlled within a certain range according to the demand. The content of non-metallic inclusions is less than 20 per kg; The properties of low temperature titanium alloy fully meet the performance level of the same batch of forgings and the microstructure is equiaxed. The low temperature titanium alloy hydrogen pump impeller of powder metallurgy passed the test of low temperature of the engine model.