Development of Ultrasonic Testing Equipment for Non-destructive Evaluation of Weldability and Adhesion of Materials and Coatings

研制了用于无损评价材料和涂层可焊性和附着力的超声检测设备，取得的主要成果总结如下：（1）指出了焦距、水距等测试条件选择的重要性。超声波检测方法特别是通过检测底层回波可以检测出涂层分层的形状和位置。（2）超声波检测方法可以无损地观察涂层在热震试验中的分层过程。（3）提出了利用超声表面回波和底部回波测量涂层阻抗和涂层/基体界面处透射系数的方法。实验结果表明，该方法能有效地同时评价涂层的孔隙和结合力。（4）对铜-铝摩擦焊接头进行了超声检测，并对接头进行了无损检测。结果表明，该方法可以通过检测界面回波高度分布来评价节理的完好性。

Ultrasonic testing equipment for non-destructive evaluation of weldability and adhesion of materials and coatings were developed.Main results obtained are summarized as follows :(1)The importance in selection of test conditions such as focal distance and water distance is pointed out. The shape and position of delamination of coating can be detected by the ultrasonic testing method especially by detecting the bottom echo.(2)The delaminating process of coating in thermal shock test can be observed non-destructively by the ultrasonic testing method.(3)The method to measure the impedance of coating and transmission coefficient at the interface between coating and substrate detected by ultrasonic surface echo and bottom echo is proposed. As the result of the experimental investigation, it is confirmed that this method proposed is effective to evaluate simultaneously pore and adhesion of coating.(4)Friction welding of copper to aluminum was performed and ultrasonic testing method was proposed to evaluate the joints non-destructively. And it is shown that the soundness of joints can be evaluated by detecting interface echo height distribution using the ultrasonic testing method proposed.