周小卫,沈以赴,靳惠明

• 1:南京航空航天大学材料科学与技术学院
• 2:扬州大学机械工程学院

摘要(Abstract)：

利用超声波高频振荡效应与双脉冲电源特性电沉积法制备Ni-CeO2稀土纳米复合镀层。利用环境扫描电镜(E-SEM)及透射电子显微镜(TEM),分别对镀层的微观形貌与晶粒结构进行分析表征。分析时效热处理和纳米稀土CeO2掺杂对晶体结构转变、显微硬度、热裂纹产生与扩展机理的影响。研究表明:由于纳米尺度稀土颗粒"抢占"Ni晶粒长大的空间,限制其粗大,生成组织致密且具有非晶态结构的合金镀层;复合沉积的稀土能钉扎愈合开裂的大晶界;纳米稀土颗粒填充晶界间隙等并有效地阻止裂纹源的萌生与扩展;经过500℃×2 h效热处理后,形成NiCexO1-x(0

关键词(KeyWords)： 超声振荡场;双脉冲电沉积;时效热处理;纳米氧化铈;Ni-CeO2

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50775113);; 江苏省自然科学基金(BK2007201)

作者(Author): 周小卫,沈以赴,靳惠明

DOI: 10.13289/j.issn.1009-6264.2012.02.027

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