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以CuMoO4-MoO3粉末为前驱体,采用机械化学-氢气共还原的方法制备出Mo-Cu纳米复合粉末。通过DSC对前躯体的制备温度进行研究,通过XRD、SEM及TEM分别对粉末的相组成、形貌和粒度进行表征,从热力学的角度对粉末的还原过程进行分析。结果表明,机械球磨可以有效地降低粉末的颗粒尺寸,增大反应面积,提高粉末还原活性,从而在低温下制备出Mo-Cu复合粉末。通过优化工艺参数,对机械球磨15h的CuMoO4-MoO3混合粉末在680℃下还原,可以得到颗粒尺寸为50～100nm的Mo-25%Cu(质量分数)纳米复合粉末。
Mo-Cu nanocomposite powder was prepared by the method of mechanochemical-hydrogen co-reduction with CuMoO4-MoO3 powder as precursor. The preparation temperature of the precursor was studied by DSC. The phase composition, morphology and particle size of the powder were characterized by XRD, SEM and TEM respectively. The reduction process of the powder was analyzed from the thermodynamic point of view. The results show that mechanical ball milling can effectively reduce the particle size of the powder, increase the reaction area and increase the powder reduction activity, so as to prepare the Mo-Cu composite powder at a low temperature. By optimizing the process parameters, the Mo-25% Cu (mass fraction) nanocomposite powder with a particle size of 50 ~ 100nm can be obtained by reducing the CuMoO4-MoO3 powder by mechanical milling at 680 ℃ for 15h.