Study on sintering properties of nano Mo–40Cu composite powders prepared by hydrothermal method and hydrogen reduction method
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摘要: 结合水热法和氢气还原法制备纳米Mo–40Cu复合粉末，利用X射线衍射仪、扫描电子显微镜、透射电镜等手段研究了氢气气氛下烧结工艺对Mo–40Cu复合材料组织和力学性能的影响。结果表明，最佳制粉工艺为水热温度400 ℃和氢气还原温度700 ℃，获得了均匀的Mo–40Cu复合粉末，粉末粒径为70~90 nm；在氢气气氛下最佳烧结工艺为1300 ℃保温2 h，合金的相对密度、抗弯强度、硬度、电导率和热导率分别为98.1%、1060 MPa、HRA 51、20.8 MS·m-1和191.7 W·m-1·K-1，热膨胀系数在500~700 ℃约为10.8×10-6 K-1，合金中组织均匀，晶粒细小，尺寸约为3~4 μm。Abstract: The Mo-40Cu composite powders were prepared by the hydrothermal and hydrogen reduction method, the effects of sintering process in the hydrogen atmosphere on the microstructure and mechanical properties of the Mo-40Cu composites were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The results show that, the optimum process parameters for the powder preparation are 400 ℃ for the hydrothermal temperature and 700 ℃ for the hydrogen reduction temperature, obtaining the homogeneous Mo-40Cu composite powders with the powder particle size of 70~90 nm. The optimum sintering process in the hydrogen atmosphere is sintering at 1300 ℃ for 2 h, the relative density, bending strength, hardness, electrical conductivity, and thermal conductivity are 98.1%, 1060 MPa, HRA 51, 20.8 MS·m-1, and 191.7 W·m-1·K-1, respectively, and the thermal expansion coefficient is 10.8×10-6 K-1 at 500~700 ℃. The microstructure of Mo-40Cu alloy is homogenous with the grain size of about 3~4 μm.
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Key words:
- Mo–40Cu alloy /
- hydrothermal method /
- hydrogen reduction method /
- sintering /
- mechanical properties
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图 1 不同水热温度下Mo–40Cu前驱体粉末X射线衍射图谱
Figure 1. XRD patterns of the Mo–40Cu precursor powders at different hydrothermal temperatures
图 2 不同还原温度下Mo–40Cu复合粉末X射线衍射图谱
Figure 2. XRD patterns of Mo–40Cu composite powders at different hydrogen reduction temperatures
图 3 不同还原温度下Mo–40Cu复合粉末扫描电子显微形貌：（a）650 ℃；（b）700 ℃；（c）750 ℃
Figure 3. SEM images of Mo–40Cu composite powders at different hydrogen reduction temperatures: (a) 650 ℃; (b) 700 ℃; (c) 750 ℃
图 4 700 ℃还原温度下复合粉末透射电镜形貌：(a)透射电镜粉末形貌；(b)高分辨透射电镜粉末形貌
Figure 4. TEM images of the composite powders at the reduction temperature of 700 ℃: (a) TEM image of powders; (b) high resolution TEM image of powders
图 5 不同烧结温度下Mo–40Cu合金的密度和相对密度
Figure 5. Density and relative density of the Mo–40Cu alloys sintered at different temperatures
图 6 不同烧结温度下Mo–40Cu合金的抗弯强度和硬度
Figure 6. Bending strength and hardness of the Mo–40Cu alloys sintered at different temperatures
图 7 不同烧结温度下Mo–40Cu合金的电导率和热导率
Figure 7. Electrical conductivity and thermal conductivity of the Mo–40Cu alloys sintered at different temperatures
图 8 Mo–40Cu合金的热膨胀系数与测试温度关系曲线
Figure 8. Relationship between the thermal expansion coefficient and the test temperatures of Mo–40Cu alloys
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