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Method for manufacturing a high-temperature ultrasonic transducer using a lithium niobate crystal brazed with gold and indium
Method for manufacturing a high-temperature ultrasonic transducer using a lithium niobate crystal brazed with gold and indium
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机译:使用钎焊有金和铟的铌酸锂晶体制造高温超声换能器的方法
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摘要
A process for manufacturing a high-temperature ultrasonic transducer, said transducer comprising a steel or metal top electrode, a piezoelectric converter, a steel or metal support ensuring the interface between the converter and the propagation medium of the acoustic waves, a first joint between the support and the piezoelectric crystal, and a second joint between the converter and the top electrode, comprises, to produce said gold-and-indium-based joints, a brazing and diffusing operation comprising the following steps: a first step of increasing temperature to a first temperature comprised between about 150° C. and about 400° C. and of maintaining this first temperature for a first length of time corresponding to a first plateau; and a second step of increasing temperature to a second temperature comprised between about 400° C. and about 1000° C. and of maintaining this second temperature for a second length of time corresponding to a second plateau.
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