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Open AccessArticle

A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding

by Mingqiang Pan 1,2,3, Minghui Tu 1,2,3,* and Jizhu Liu 1,2,3,*
1
School of Mechanical and Electric Engineering, Soochow University, Suzhou 215123, China
2
Jiangsu Provincial Key Laboratory of Advanced Robotics, Soochow University, Suzhou 215123, China
3
Robotics and Microsystems Center, Soochow University, Suzhou 215123, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(13), 2911; https://doi.org/10.3390/ma13132911
Received: 24 May 2020 / Revised: 22 June 2020 / Accepted: 22 June 2020 / Published: 29 June 2020
To meet the application requirements of a thermal gas sensor, it is necessary to realize a bond connection between PtW8 wire with a Au thick film. However, the physical properties, such as the melting point and hardness, of the two materials differ greatly. In this study, the parallel-gap resistance microwelding was introduced into the bonding connection between PtW8 wire and a Au thick film in the thermal gas sensor. The feasibility of the method was analyzed theoretically and the experimental system was established and studied. A scanning electron microscope (SEM) was used to analyze the morphology of the cross-section of the welded joint. The results showed that there was no obvious transition layer at the interface region but there were relatively dense welds. At the same time, it was found that the melted Au wetted and climbed on the surface of the platinum-tungsten alloy, which may have been the key to forming the joint. Elements were observed to have a spatial distribution gradient within the cross-section of the welding line, revealing that mutual diffusion occurred in the parallel-gap resistance microwelding, where this diffusion behavior may be the basic condition for forming the joint. Finally, the influence of the welding voltage, time, and force on the joint strength was also studied, where the joint strength could be up to 5 cN. View Full-Text
Keywords: ultrahard PtW8 wire; Au thick film; parallel-gap welding; thermal gas sensor; joint formation ultrahard PtW8 wire; Au thick film; parallel-gap welding; thermal gas sensor; joint formation
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MDPI and ACS Style

Pan, M.; Tu, M.; Liu, J. A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding. Materials 2020, 13, 2911.

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