According to foreign media reports, the advent of summer, the car steering wheel becomes hot and hot, but new thermoelectric materials can solve the problem. Due to the lack of materials that can maintain high efficiency at room temperature and at the same time are cheap, the popularity of thermoelectric equipment that can directly convert electrical energy into thermal energy to achieve cooling and heating functions is hindered. But now, researchers from the University of Houston and the Massachusetts Institute of Technology report that they have discovered a new material that works very efficiently at room temperature. And almost no expensive tellurium (tellurium is the main component of the most advanced materials). The researchers of the study stated that the material can help prevent electronic devices, vehicles and other parts from overheating. In addition, the material is very cheap, but the performance is as good as the traditional, more expensive materials. In the future, researchers will work to narrow the slight performance gap between the material and the traditional material (bismuth tellurium alloy). The working principle of thermoelectric materials is to use the heat flow from the hotter area to the colder area, and the thermoelectric cooling module will work according to the Peltier effect (Peltier effect), which describes the two different conductor joints with the direction of the current Different, there will be endothermic and exothermic phenomena. In addition, thermoelectric materials can also be used to convert waste heat from power plants, automobile exhaust pipes, and other sources into electrical energy. And it is reported that many new materials are used for such applications, and such applications require the materials to be able to work at higher temperatures. Because the thermoelectric cooling module must work in a lower temperature environment, the thermoelectric conversion coefficient value ZT value of the thermoelectric module is relatively low (the coefficient depends on the temperature), so the thermoelectric cooling module creates a huge challenge. The figure of merit coefficient ZT value is an indicator to measure the working efficiency of thermoelectric materials. The higher the ZT value of thermoelectric materials, the better. Despite the challenges, at least so far, such thermoelectric cooling modules have great commercial potential, partly because they can work at lower temperatures for long periods of time, and thermoelectricity generates high temperatures (oxidation and thermal instability) when generating electricity. Sex) will become very complicated. The thermoelectric cooling market is growing. According to researchers, the global market value of thermoelectric modules is about 600 million US dollars in 2018 and is expected to reach about 1.7 billion US dollars by 2027. For decades, bismuth-tellurium alloys have been considered to be the best thermal cooling materials, but researchers say that the high cost of tellurium has limited its widespread use. Although the cost of tellurium has decreased recently, it is still around US $ 50 per kg. In contrast, the main component of the new material developed by the researchers is magnesium, and the price of magnesium is about 6 US dollars per kilogram. The researchers said that this new material is made of magnesium and bismuth and is created in the form of a negative charge (n-type), which is as efficient as the traditional bismuth-tellurium material. In addition, the lower cost of the material may expand the thermoelectric module for cooling applications. In order to use this new material to make a thermoelectric module, the researchers combined it with the positive charge carriers in the traditional bismuth-tellurium alloy, so only half of the tellurium in most current modules is needed. The cost of the material is about One-third of the cost, which can save a lot of costs. In addition, the new material has better electrical contact capabilities than most nanostructured materials. (Author: Yuqiu Yun) Phillips Bugle Head Screw,Phillips Flat Bugle Head Screw,Bugle Head Cross Recessed Drywall Screw,Phillips Hex Head Self Drilling Screw Handan Jiankun Hardware Products Co., Ltd / Handan best import and export trade co., Ltd , https://www.jkscrew.com
(Source: University of Houston official website)