热等静压烧结温度对Mo–Na合金性能影响

Effect of hot isostatic pressing sintering temperature on the properties of Mo–Na alloys

采用热等静压烧结法制备Mo–Na合金,研究了热等静压烧结温度对Mo–Na合金显微组织、硬度、密度及Na质量分数的影响,分析了Mo–Na合金热等静压烧结的致密化过程。结果表明:采用热等静压烧结法制备的Mo–Na合金显微组织细小均匀,平均晶粒尺寸在10μm以下。随着热等静压烧结温度的升高,相对密度及硬度随之升高,在1100℃时达到最大,分别为99.58%和HRA 54.50,热等静压过程中液相的形成对Mo–Na合金的致密化起到了重要作用。热等静压过程很好地避免了低熔点Na金属高温烧结过程中的挥发,在1100℃烧结后Na质量分数基本无变化。

Mo–Na alloys were prepared by the hot isostatic pressing(HIP)sintering.The effects of HIP sintering temperature on the microstructure,hardness,density,and Na mass fraction of the Mo–Na alloys were studied.The densification process of the Mo–Na alloys sintered by HIP was analyzed.The results show that,the microstructure of the Mo–Na alloys prepared by HIP sintering is ultrafine and uniform,the average grain size of the alloys is below 10μm.With the increase of the HIP sintering temperature,the relative density and hardness increase and reach the maximum value at 1100℃,which is 99.58%and HRA 54.50,respectively.The liquid phase formation during HIP plays an important role in the densification of the Mo–Na alloys.The volatilization of the Na metals with the low melting point during the high temperature sintering is well avoided in the process of HIP,and the Na mass fraction is almost unchanged after sintering at 1100℃.