以聚甲醛(POM)为原料通过压缩成型获得高密度 7075 铝合金的微观结构和机械性能

Heng Zou, Yi Sun, Mengxiong Chen, Yuan Jiang, Yang Fu, Huiwen Xiong, Lei Zhang, Kechao Zhou
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引用次数: 0

摘要

金属注射成型铝合金(MIM-Al)因其轻质、耐腐蚀和良好的导热性而备受关注。然而,由于难以烧结的粉末和较差的机械性能,很难制造出高质量的 MIM-Al。在此,我们报告了一种使用聚甲醛(POM)为原料制造高密度 7075Al 合金零件的简便压缩成型工艺。采用高氮气流量的无压烧结工艺来促进烧结致密化过程。对原料的润湿行为、流变特性和形态进行了表征,结果表明 POM-PP-SA 粘合剂具有剪切稀化行为和合适的粘度。通过控制压制压力、模具温度和保温时间,获得了形状保持良好、微观结构致密的绿色齿轮零件。研究了工艺因素和烧结温度对 7075Al 合金微观结构和机械性能的影响。值得注意的是,在 610 °C 下烧结的铝合金部件性能优异,相对密度达到 97.6 %,抗拉强度达到 214.8 MPa。这一成果为通过压缩成型工艺生产复杂形状的铝合金部件的工业应用奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure and mechanical property of high-density 7075 Al alloy by compression molding of POM-based feedstock
Metal injection molding of aluminium alloy (MIM-Al) attracts attention, owing to the lightweight, corrosion resistance and good thermal conductivity. However, it is hard to fabricate high-quality MIM-Al due to the hard-to-sinter powder and poor mechanical properties. Here, we report a facile compression molding process for fabricating high-density 7075Al alloy parts using polyformaldehyde (POM)-based feedstock. Pressureless sintering with a high nitrogen flow rate was adopted to promote sintering densification process. The wetting behavior, rheological properties, and morphology of the feedstock were characterized, showcasing the shear-thinning behavior and suitable viscosity for POM-PP-SA binder. Through controlling the compact pressure, mold temperature and holding time, green gear part with good shape retention and dense microstructure was achieved. Influence of process factors and sintering temperature on the microstructure and mechanical properties of 7075Al alloy are investigated. Remarkably, the aluminum alloy components sintered at 610 °C exhibited excellent performance, with a relative density reaching 97.6 % and a tensile strength of 214.8 MPa. This achievement provides a foundation for the industrial application of complex-shaped aluminum alloy components through the compression molding process.
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