摘要
铝基碳化硅复合材料具有高导热率、低热膨胀以及尺寸稳定性好等特点,广泛应用于空间微波组件管壳产品。为满足其应用于天线微波组件时的导电、焊接、散热等功能特性要求,铝基碳化硅复合材料需要进行化学镀镍,此过程会引入氢,由此对释氢、控氢提出明确需求。基于此,对铝基碳化硅镀镍的氢分布进行研究,采用SEM、XRD等方法分析材料微观结构表征,结果表明,基材与镀层均存在一定的孔隙结构,为氢的存贮提供场所;采用氢微印的实验方法表征氢的分布,结果表明铝基碳化硅镀镍中的氢规律为:铝基碳化硅镀镍后,氢分布在镀镍层和镀层下浅层基体中,且随着时间的延长,氢自发向深层基体扩散;氢主要分布在Al基体中,SiC颗粒上较少,且主要分布在基材及镀层中的微孔及位错缺陷处。采用TDS对不同温度除氢后的铝基碳化硅镀镍的氢释放量进行测试,表明高温除氢后释氢明显降低,且温度高有利于氢释放。
Aluminum based silicon carbide composite materials have the characteristics of high thermal conductivity,low thermal expansion,and good dimensional stability;therefore,the composites are widely used in space microwave component shell products.In order to meet the functional requirements of conductivity,welding,and heat dissipation when applied to antenna microwave components,aluminum based silicon carbide composite materials need to be chemically plated with nickel,which introduces hydrogen,thus requiring research on hydrogen release and control.Here,the hydrogen distribution of nickel plating on aluminum based silicon carbide has been analyzed,and SEM,XRD and other methods are used to characterize the microstructure of aluminum based silicon carbide substrate and nickel plating layer.There are certain pore structures in both the substrate and plating layer,providing a place for hydrogen storage.The experimental method of hydrogen microprinting has been used to characterize the distribution of hydrogen.The results showed that the hydrogen distribution pattern in aluminum based silicon carbide nickel plating are as follows:after nickel plating on aluminum based silicon carbide,hydrogen is distributed in the nickel plating layer and the shallow substrate under the coating,and with the extension of time,hydrogen spontaneously diffuses to the deep substrate,and hydrogen is mainly distributed in the Al matrix and less on SiC particles,especially,distributed in micropores and dislocation defects in the substrate and Ni.Herein,TDS has been used to test the hydrogen release of aluminum based silicon carbide nickel plating after hydrogen removal at different temperatures.The results show that hydrogen release is significantly reduced after high temperature hydrogen removal,and high temperature is beneficial obviously for hydrogen release.
作者
王楠
崔庆新
李思振
王景润
徐俊杰
赵潋景
吕振兴
佟晓波
WANG Nan;CUI Qingxin;LI Sizhen;WANG Jingrun;XU Junjie;ZHAO Lianjing;LV Zhenxing;Tong Xiaobo(Beijing Spacecrafts,Beijing 100094,China)
出处
《高科技纤维与应用》
CAS
2024年第3期27-33,共7页
Hi-Tech Fiber and Application
关键词
铝基碳化硅
化学镀镍
氢释放规律
微波组件管壳
aluminum based silicon carbide composites
electroless nickel plating
hydrogen release law
microwave component shell
