Preparation of Al2O3/Cu porous composites by the combination of solution combustion synthesis and powder metallurgy method
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摘要: 以硝酸铜、硝酸铝、葡萄糖和尿素为原料，首先采用溶液燃烧合成和氢还原法制备了Al2O3 /Cu 复合粉末，然后将Al2O3/Cu复合粉末与造孔剂氯化钠均匀混合后，再将混合粉末冷压成型，最后通过烧结-脱溶工艺制得Al2O3/Cu多孔复合材料（A-C-M）。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对粉末原料和A-C-M的微观形貌进行表征分析，使用万能试验机对A-C-M进行压缩性能测试，研究葡萄糖添加量对燃烧产物粉末的影响，探讨了Al2O3含量对A-C-M压缩性能的影响。结果表明，葡萄糖与 Cu(NO3)2的摩尔比为1时，燃烧产物的比表面积达到了最大值，为12.5 m2·g-1；燃烧产物经煅烧除碳后，粉末颗粒的孔洞增加，但因高温煅烧产生烧结作用，其比表面积降低为10.2 m2·g-1；煅烧产物经氢还原后，粉末颗粒破碎为絮状，然而因还原高温的烧结作用，使获得Al2O3/Cu复合粉末的比表面积进一步降低为7.5 m2·g-1；随Al2O3含量的增加，A-C-M孔隙率逐渐增加，其抗压缩强度逐渐降低。
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关键词:
- Al2O3/Cu多孔复合材料 /
- 溶液燃烧合成 /
- 葡萄糖 /
- 孔隙率 /
- 压缩性能
Abstract: Al2O3/Cu composite powder was prepared by solution combustion synthesis and hydrogen reduction method using copper nitrate, aluminum nitrate, glucose and urea as raw materials. The Al2O3/Cu composite powder was uniformly mixed with the pore-forming agent sodium chloride, and then the mixed powder was cold-pressed. Finally, the Al2O3/Cu porous composite material (A-C-M) was prepared by sintering-dissolution process. The microstructure of powder raw materials and A-C-M were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The compression performance of A-C-M was tested by universal testing machine. The effect of glucose addition on the combustion product powder was studied. The effect of Al2O3 content on the compression performance of A-C-M was discussed. The results show that when the molar ratio of glucose to Cu(NO3)2 is 1, the specific surface area of the combustion product reaches a maximum of 12.5 m2·g-1. After the combustion product is calcined to remove carbon, the pores of the powder particles increase, but the specific surface area is reduced to 10.2 m2·g-1 due to the sintering effect of high temperature calcination. After the calcination product was reduced by hydrogen, the powder particles were broken into floccules. However, due to the sintering effect of high reduction temperature, the specific surface area of the obtained Al2O3/Cu composite powder was further reduced to 7.5 m2·g-1. With the increase of Al2O3 content, the porosity of A-C-M increases gradually, and its compressive strength decreases gradually. -
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