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We have performed a first-principles density functional theory method and molecular dynamics simulation on the Nb2AlC(001)/Nb(001), Nb2AlC(001)/Nb(110), and Nb2AlC(001)/Nb(111) interfaces. The results show that the Nb2AlC(001)/Nb(111) interface structure is the most stable structure of the three. The Al-Nb bonds at the Nb2AlC(001)/Nb(111) interfaces show covalence bonding character, while the Nb-Nb...
Defects in terms of voids, cracks, and delaminations are often generated in light-emitting diodes (LEDs) devices and modules. During various manufacturing processes, accelerated testing, inappropriate handling, and field applications, defects are most frequently induced in the early stage of process development. One loading is due to the nonuniform loads caused by temperature, moisture, and their...
Undesired residual stress always exists in light emitting diode (LED) after the process of metalorganic chemical vapor deposition (MOCVD) due to difference in thermal expansion coefficient of different layers, doping, and lattice mismatch. Residual stress would mostly induce defects in the process of LED chips, the packaging, accelerated testing and their applications. The influence of strain/stress...
As high power LEDs develop rapidly, sapphire substrate on which LED's chips are grown, cannot meet the needs of the increasing performance any longer. Therefore, transfer of the devices from the former sapphire substrates to more thermally and electrically conductive receptor substrates is recommended. Laser peeling has been a new technology of separating films of GaN from the substrate on which they...
With the development of automobile technology, more and more sensors are used for control of brakes, suspensions, engines, etc. To work well under harsh condition such as high temperature, power cycling, and rapid vibration, a sensor must have high reliability and durability, which is a great challenge to original equipment manufacturers (OEMs) and suppliers. It has been found that some bond aluminum-silicon...
More and more research has been done on tire pressure monitoring system (TPMS) with the rapid development of automobile industry and increasing public attention to automobile safety. It is generally known that suitable tire pressure is a critical factor in the safe operation, tire wear, gas mileage and performance of a motor vehicle. It is also important to reduce maintenance and logistic cost of...
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