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Defects such as interfacial delaminations degrade the yield rate and reliability of the device. It's important to find and evaluate these defects on time. Infrared Thermography is proved to be a valuable tool for non-destructive testing of materials. In this paper the relationship between the thermal characteristics of the sample surface and the defect feature parameters is investigated using Infrared...
Infrared thermography has become increasingly important for non-destructive testing to detect internal defections, involving delaminations, cracks and voids. In this paper, the principle of infrared thermography is presented briefly. And a finite element approach is proposed to simulate the process of infrared thermography nondestructive testing about QFN packages. By changing with the length and...
The growth of intermetallic compounds (IMC) at the Sn3.0Ag0.5Cu/Cu interface is investigated under aging temperature of 150 °C and aging time of 100, 300 and 500 hours. The relationship between the thickness of the IMC and aging time is fitted out, and the growth law of the IMC at Sn3.0Ag0.5Cu/Cu interface under isothermal aging condition is obtained. Mechanical properties of the Cu6Sn5 and Cu3Sn...
Arc burning time is the time interval from arc burning until arc quenching, which is one of the main symbol parameters of the arc plasma characteristic. As the length of arc burning time can do great influence on the arc energy and the two-phase change process of the break arc directly, it is significant for us to do some researches on its influence factors and change laws. To take the DC break arc...
The contact bounce of relays, which is the main cause of electric abrasion and material erosion, is inevitable. This paper presents an investigation of the parameters influencing the dynamics characteristics of contact bounce under different current loading. An experimental model system, which simulated the direct-driven reed systems of relays, was designed. The measurements of small bouncing displacement...
Arcs in DC relays have the characteristics of short burning time and little brightness. A high speed photograph experiment was designed and performed in this paper. In the experiment, the whole burning processes of arcs were captured and some parameters such as arc diameter, length and grey level were obtained from the photos by digital image processing technology. Combining with the waveforms of...
In order to examine the surface film growth on the contacts of sealed relay, we designed a set of experiments to simulate the film growth and also did some verification. Analysis of average contact resistance values of normally closed contact and normally open contacts in certain environments was conducted for the contact samples with or without aging or burnish operations. Some discussions were made...
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