文章摘要
石墨烯纳米片增强银基复合材料
Silver Matrix Composites Reinforced with Graphene Nanoflakes
投稿时间:2018-08-16  
DOI:
中文关键词: 银基复合材料  石墨烯纳米片  粉末冶金  力学性能  断裂特征
英文关键词: silver matrix composites  graphene nanoflakes  powder metallurgy  mechanical property  fracture characteristic
基金项目:国家自然科学基金项目(51707087)、云南省应用基础研究项目(2018FB094、2081FD142)。
作者单位E-mail
王松 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106 fenmoyejin@qq.com 
李爱坤 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106  
侯攀 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106  
张吉明 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106  
陈永泰 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106  
谢明 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106 powder@ipm.com.cn 
刘满门 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室昆明 650106  
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中文摘要:
      采用粉末冶金方法成功制备了石墨烯增强块状银基复合材料。在V型混粉机中混粉制得含银-0.2%石墨烯纳米片(质量分数)复合粉末并使用冷等静压在200 MPa条件下将复合粉末压制成形。使用热等静压在750℃/100 MPa条件下烧结获得石墨烯纳米片增强银基复合材料,然后在850℃条件下进行热挤压获得丝材,挤压比为40。用SEM、TEM和静态拉伸试验等研究了复合材料的微观结构和力学性能,结果表明,复合材料中石墨烯分布均匀,银基体与石墨烯之间界面结合良好。与未增强的银基体相比,银-0.2%石墨烯纳米片复合材料具有显著提高的强度而不损失塑性,表明石墨烯纳米片是银基复合材料理想的增强相。复合材料断口形貌显示出大量韧窝和撕裂棱,其断裂特征为典型的韧窝聚合型延性断裂。
英文摘要:
      Graphene reinforced bulk silver matrix composites were successfully fabricated via powder metallurgy approach. Silver-0.2%graphene(mass fraction) composite powder was prepared by mixing powder in a V-type powder mixer and the composite powder was formed using cold isostatic pressing at 200 MPa. The composites were then sintered using hot isostatic pressing with a pressure of 100 MPa at 750℃ and followed by hot extrusion with a extrusion ratio of 40 at 850℃ to obtain wires. The microstructure and mechanical properties of the composites had been investigated by SEM, TEM and static tensile tests. Microstructure observation illustrated a uniform distribution of graphene in silver matrix and a good interface binding between graphene and silver matrix. Compared with the unreinforced silver matrix, the silver-0.2% graphene nanoflakes composite exhibited significantly improved strength without losing ductility, which demonstrates that graphene nanoflakes could act as superb reinforcements in silver matrix composites. The fracture morphology of the composite showed a large number of dimples and tear ridges and its fracture characteristic is the typical dimple-polymerized ductile fracture.
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