摘要
100件铝合金天线组合中,发现有21件发生钎料流出堆积。天线组合由5层3A21原材料板真空钎焊而成。对天线和原材料板材表面粗糙度、晶粒组织、析出相、焊缝组织、维氏硬度进行对比检测,并进行热处理对比实验,分析影响天线真空钎焊质量的多个因素,确认钎料在板材表面铺展程度不同的主要因素之一为表面粗糙度。失效件原材料存在晶粒较大、硬度较低的情况,通过严格控制板材热处理温度在再结晶温度以下以及板材晶粒尺寸,此类失效没有再次发生。
It was found that 21 pieces of 100 aluminum alloy antenna assemblies failed due to solder spreading out.The antenna assemblies were brazed with 5 layers of 3A21 raw material sheets in vacuum.The surface roughness,grain microstructure,precipitated phase,solder microstructure and Vickers hardness of the antennas and raw material sheets were compared,and the heat treatment comparison experiment was carried out to analyze several factors which affect the brazing quality of the antennas.It was confirmed that one of the main factors affecting the spread degree of solder on the sheet surface was surface roughness.Failed antenna raw material sheets had larger grain size and lower hardness.Such failure did not occur again after strictly controlling the heat treatment temperature below recrystallization temperature and the grain size of raw material sheets.
作者
张钰丹
郑真
林栋
方坤
ZHANG Yu-dan;ZHEN Zhen;LIN Dong;FANG Kun(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;AVIC Failure Analysis Center,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Key Laboratory of Aeronautical Materials Testing and Evaluation,Aero Engine Corporation of China,Beijing 100095,China;Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation,Beijing 100095,China;93128 Troops,Beijing 100843,China;The 38th Institute of CETC,Hefei 230088,China)
出处
《失效分析与预防》
2020年第4期260-265,272,共7页
Failure Analysis and Prevention
关键词
天线组合
3A21合金
真空钎焊
钎料铺展
粗糙度
antenna assembly
3A21 aluminum alloy
vacuum brazing
spreading out of solder
surface roughness
