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Effect of the laser treatment on electroless Ni-P-SiC composite coatings was investigated. The microscopic structure, surface morphology, ingredient, and performance of the Ni-P-SiC composite coatings were synthetically analyzed by the use of X-ray diffraction apparatus, scanning electron microscope, energy distribution spectrometer, micro-hardness tester, wear tester and so on. It was found that the composite coatings did make crystalloblastic transformation after laser heating. Structural analysis confirmed that some new types of phase Ni2Si or Ni3Si compound would emerge in the Ni-P-SiC coatings after laser treatment. The micro-hardness measurement results showed that when the laser power was 450 W with scanning speed of 0.5 m/min, the hardness of the coating was superior to the coating obtained by the conventional furnace heating, and wear resistance of the composite coating after laser treating could also improve.  相似文献   
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蒋小燕  苏远岐 《应用声学》2014,22(5):1549-1551
随着汽车产业在中国的蓬勃发展,对汽车娱乐系统的需求也是水涨船高,数字电视也正成为新车型设计时必备的功能,汽车保有市场的需求也同样不可限量;针对中国移动电视有CMMB和CTTB两种制式,为了增强用户的收视节目数量和质量,同时使产品设计更加集成化,在此提出了一种二合一产品的研究与设计;通过实验验证,CTTB在模式4的调制模式下灵敏度达到-86 dBm,CMMB在QPSK,CR为3/4的情况下灵敏度达到-96 dBm,均优于规范要求2 dB以上;厂商实际使用结果来看,这也是一个高效和经济的解决方案。  相似文献   
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