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material physics and chemistry中文是什么意思

  • 材料物理与化学

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  • Materials physics and chemistry
    材料物理与化学
  • Zhang liji ( material physics and chemistry ) directed by professor xie xiaoming this paper is intended to solve problems for those who are designing , using pbgas . failure mechanism , as well as cycles to failure of two groups of pbga samples ( with / without underfill ) for thermal cycling conditions in the range of - 40 ~ 125 , were presented . the experiment shows that solder ball in the samples without underfill cracked after 500 times cycle , no crack was found in the underfilled samples even after 2700 cycles
    通过一系列的实验,得到以下实验结果: ?在本论文设定的温度循环条件下,未充胶pbga样品的热疲劳品寿命在500周左右,充胶样品的焊点寿命高于2700周; ?对于未充胶器件,中心距( dnp )是决定焊点应力、应变大小的最主要因素,裂纹总是从中心距较大处萌生并向中心处扩展; ?温度循环的过程中焊盘附近焊料组织明显粗化。
  • Jiulin wang ( materials physics and chemistry ) directed by naixin xu , jun yang and jingying xie due to its abundant resources , low toxicity and the highest charge capacity in all known cathode materials , elemental sulfur is a promising cathode material for the next generation of high - performance lithium batteries
    单质硫因具有很高的理论能量密度、丰富的自然资源和无毒性等多种优势,成为下一代锂电池中替代licoo _ 2的首选正极材料之一。可是目前报道的li / s电池面临着一系列严重的问题,包括活性物质利用率低,循环性能差等。
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