Cu与Gd_5Si_(3.2)Ge_(0.8)合金粉烧结复合的工艺研究

Research on production process of Cu and Gd_5Si_(3.2)Ge_(0.8) alloy powders sintered composite

针对室温磁制冷材料Gd5Si3.2Ge0.8的导热性能较差、高硬度和高脆性缺点,将按质量分数配比的Cu粉末和Gd5Si3.2Ge0.8颗粒混合,在真空烧结炉中利用高温扩散使两者紧密结合。试验结果表明,由于Cu具有良好导热性和延展性能,使Gd5Si3.2Ge0.8与Cu的复合材料脆性得到改善。与纯Gd5Si3.2Ge0.8相比,复合材料的绝热温变△Tad稍有下降,但在合理误差范围内,不影响使用。另外,绝热温变△Tad达最大值时所对应的Tc基本上没有偏移。

Room-temperature magnetic refrigerant material GdsSi3.2 Ge0.8 has defects of weak heat conductivity, high hardness and high brittleness, resulting in difficulty in fabrication. Cu power in certain mass fraction and Gd5Si3.2Ge0.8 powder were mixed, pressed tightly and sintered in vacuum sinter furnace through high temperature diffusion to join together. Experiment results indicate that the ductility and conductivity of composite materials of Gd5Si3.2Ge0.8 and Cu are improved because of the function of Cu. Compared with pure Gd5Sia.2Ge0.8, the adiabatic temperature changes △ Tad of composite material has a little drop, which fall into reasonable error band and don＇t affect its use in magnetic refrigerators. Its curie point Tc basically keeps normal according to the measurement of adiabatic temperature changes △ Tad