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Investigation of the Impacts of Thermal Shock on Carbon Composite Materials

机译：热冲击对碳复合材料影响的研究

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Carbon composite is widely used in various fields, including the aerospace industry, electrical engineering, transportation engineering, etc. For electrified railways, the pantograph strip utilizes carbon composite as the current collector, which might bear multiple impacts from electrical, mechanical, or thermal aspects, from unwanted arcing, rain, and other diverse operation conditions. In this paper, a thermal shock damage experiment on the carbon composite of a pantograph strip was carried out. The thermal shock processes were realized by the adoption of muffle furnace heating and water cooling. The effect of thermal shock processes on carbon strip porosity, compressive strength, electrical resistivity, and surface topography were studied. In order to verify the mechanism of thermal shock damage to the pantograph strip, the porosity of the pantograph strip is discussed in detail. The results showed that the thermal shock process increased the porosity of the carbon strip and caused reductions in compressive strength and electrical resistivity. The multiple thermal shock processes caused irreversible damage to the pantograph strip, which was attributed to the spillover and scouring of large quantities of water vapor in the pores.
机译：碳复合材料广泛应用于航空航天，电气工程，交通运输工程等各个领域。对于电气化铁路，受电弓条采用碳复合材料作为集电器，可能会受到电气，机械或热学方面的多重影响，不必要的电弧，雨水和其他各种运行条件。本文对受电弓带的碳复合材料进行了热冲击破坏实验。通过采用马弗炉加热和水冷却来实现热冲击过程。研究了热冲击过程对碳带孔隙率，抗压强度，电阻率和表面形貌的影响。为了验证热冲击损坏集电弓条的机理，详细讨论了集电弓条的孔隙率。结果表明，热冲击过程增加了碳带的孔隙率，并导致抗压强度和电阻率降低。多次热冲击过程对受电弓带造成了不可逆转的损害，这归因于孔中大量水蒸气的溢出和冲刷。

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