Effect of hot isostatic pressing sintering temperature on the properties of Mo–Na alloys
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摘要: 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10 μm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。Abstract: 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 10 μm. 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 ℃.
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Key words:
- hot isostatic pressing /
- Mo–Na alloys /
- sintering temperature /
- densification
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图 1 不同烧结温度下Mo–Na合金的相对密度
Figure 1. Relative density of the Mo–Na allys at different sintering temperatures
图 2 不同温度热等静压烧结样品金相组织：（a）700 ℃；（b）800 ℃；（c）900 ℃；（d）1000 ℃；（e）1100 ℃；（f）1200 ℃
Figure 2. Microstructure of the hot isostatic pressing sintered samples at different temperatures: (a) 700 ℃; (b) 800 ℃; (c) 900 ℃; (d) 1000 ℃; (e) 1100 ℃ ; (f) 1200 ℃
图 3 不同温度热等静压烧结样品断口显微形貌：（a）700 ℃；（b）800 ℃；（c）900 ℃；（d）1000 ℃；（e）1100 ℃；（f）1200 ℃
Figure 3. Fracture morphology of the hot isostatic pressing sintered samples at different temperatures: (a) 700 ℃; (b) 800 ℃; (c) 900 ℃; (d) 1000 ℃; (e) 1100 ℃; (f) 1200 ℃
图 4 Mo–Na合金的硬度及Na质量分数随温度的变化曲线
Figure 4. Hardness and Na mass fraction of the Mo–Na allys at different temperatures
表 1 不同烧结工艺条件下Mo–Na合金化学成分（质量分数）
Table 1. Chemical composition of the Mo–Na alloys in different sintering conditions
% 状态 O C Fe Ni Mg Si Al K 粉末态 0.150 0.0022 0.0016 0.0010 0.0006 0.0010 0.0003 0.0032 700 ℃热等静压烧结 0.130 0.0024 0.0020 0.0008 0.0006 0.0011 0.0003 0.0030 800 ℃热等静压烧结 0.139 0.0026 0.0021 0.0008 0.0006 0.0010 0.0003 0.0028 900 ℃热等静压烧结 0.139 0.0022 0.0023 0.0010 0.0006 0.0011 0.0003 0.0030 1000 ℃热等静压烧结 0.139 0.0027 0.0020 0.0010 0.0006 0.0010 0.0003 0.0032 1100 ℃热等静压烧结 0.139 0.0024 0.0018 0.0010 0.0006 0.0011 0.0003 0.0028 1200 ℃热等静压烧结 0.139 0.0023 0.0018 0.0010 0.0006 0.0011 0.0003 0.0027 1100 ℃真空热压烧结 0.180 0.0021 0.0018 0.0010 0.0006 0.0010 0.0003 0.0028 
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