S.H.Liang and Z.K.Fan The Department of Material and Engineering
,
Xi'an University of Technology
,
Xi'an 710048
,
China
金属学报(英文版)
A kind of Cu base composite reinforced by 0 1μm Al 2O 3 particles were prepared by hot pressing and sintering process for steel continuous casting mould. The microstructure and properties were studied. The results show that the Al 2O 3 particle distribution is uniform, and the particles refine the grain size. The tensile fracture is a mixture of quasi cleavage and dimple due to the moderate interface strength. As a result, the composite has better soft resistance and wear resistance than those of Cu and Cu alloy. With increase in super fine Al 2O 3, the density and electric conductivity of the composite decrease, but hardness and strength increase.
关键词:
hot pressing and sintering
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null
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null
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null
王俊勃
,
刘英
,
付翀
,
杨敏鸽
,
丁秉钧
稀有金属材料与工程
利用化学共沉淀和热压烧结等方法制备出纳米复合Ag-SnO_2和La掺杂Ag-SnO_2触头合金,对合金触头进行物理性能测试、真空耐电压和电弧烧蚀实验,并利用冷场发射扫描电镜(FESEM)对电性能实验前后组织进行分析.结果发现:纳米复合AgSnO_2电接触合金保持了制粉时纳米SnO_2颗粒的形貌和粒度,尤其是含La掺杂的电接触材料,其氧化物粒度更细,分布更均匀.随氧化物粒度的减小,电接触材料的硬度和电阻率增加、耐电压强度降低、耐电弧烧蚀速率减小.
关键词:
化学共沉淀
,
热压烧结
,
La掺杂SnO_2
,
纳米复合AgSnO_2电接触合金
,
耐电压
