共沉淀法制备超细Cu-Fe-Sn-Ni铜基预合金粉及其烧结胎体的抗弯强度

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摘要以CuCl₂·2H₂O、FeCl₂·4H₂O、SnCl₂·2H₂O和NiCl₂·6H₂O为原料,用H₂C₂O₄·2H₂O作为沉淀剂,采用共沉淀法制备Cu-Fe-Sn-Ni四元铜基预合金粉,并用真空热压法制备Cu-Fe-Sn-Ni铜基胎体结块和胎体/金刚石结块。研究加料顺序、溶液pH值、陈化时间、反应温度和混合金属盐溶液的浓度对前躯体粉末粒度的影响,优化工艺参数。用X 射线衍射仪和扫描电镜分析粉末的物相和形貌,并与采用混合单质粉末制备的节块抗弯强度进行对比。结果表明：共沉淀法制备Cu-Fe-Sn-Ni四元铜基预合金粉的最佳工艺为采用并加的加料方式、陈化时间为40 min、反应温度为50 ℃以及混合金属盐溶浓度为1.0 mol/L。前驱体粉体经过煅烧和氢气还原后,得到粒度约为500 nm 的超细Cu- Fe-Sn-Ni四元铜基预合金粉,热压后的胎体抗弯强度达到1 302 MPa,胎体/金刚石结块的抗弯强度为853 MPa,高于采用混合单质粉末制备的铜基胎体结块和胎体/金刚石结块抗弯强度(分别为992.5和 782.5 MPa)。

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	肖长江
	窦志强

关键词 ：共沉淀法, Cu-Fe-Sn-Ni, 预合金粉, 晶粒尺寸, 抗弯强度

Abstract：Using CuCl₂·2H₂O, FeCl₂·4H₂O, SnCl₂·2H₂O and NiCl₂·6H₂O as raw materials, H₂C₂O₄·2H₂O solution as precipitator, Cu-Fe-Sn-Ni quaternary Cu-based pre-alloyed powder was fabricated by co-precipitation method. The sintered Cu-Fe-Sn-Ni cupric carcass and the carcass/diamond caking were prepared through hot pressing processes. The effects of charging sequence, pH value, aging time, co-precipitation temperature and solution concentration on the particle size of precursor powders were investigated. The phase composition and morphology of the powder were characterized by X-ray diffraction (XRD) and scanning electronic microscope (SEM). Moreover, the flexural strength of Cu-Fe-Sn-Ni quaternary pre-alloyed powder was tested, which was compared with that of the samples that was prepared by mixing the four kinds of elemental powders. The results show the optimal process of Cu-Fe-Sn-Ni pre-alloyed powder is a parallel-flow charging sequence, co-precipitation temperature of 50 ℃, aging time of 40 min and solution concentration of 1 mol/L. The ultrafine Cu-Fe-Sn-Ni pre-alloyed powder with particle size of about 500 nm can be obtained by calcining and hydrogen reducing the precursor powder. The flexural strength of the matrix is 1 302 MPa and the carcass/diamond caking is 853 MPa after hot pressing.

Key words： co-precipitation Cu-Fe-Sn-Ni pre-alloyed powder particle size flexural strength

收稿日期: 2017-10-23 出版日期: 2019-07-12

ZTFLH:

TB131.2

基金资助:郑州市科技局自然科学项目(20150246)

通讯作者: 肖长江,副教授,博士。电话：0371-67758729;E-mail: cjxiao@haut.edu.cn

引用本文:

肖长江, 窦志强. 共沉淀法制备超细Cu-Fe-Sn-Ni铜基预合金粉及其烧结胎体的抗弯强度[J]. 粉末冶金材料科学与工程, 2018, 23(3): 246-251.
XIAO Changjiang, DOU Zhiqiang. Preparation of ultrafine Cu-Fe-Sn-Ni Cu-matrixbonded pre-alloyed powder by co-precipitation method and its flexural strength of sintered matrix. Materials Science and Engineering of Powder Metallurgy, 2018, 23(3): 246-251.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I3/246

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