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Study on thermal conductivity of iron-based alloy coatings prepared by wire arc spraying process

机译：电弧喷涂法制备铁基合金涂层的导热性研究

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摘要

The thermal conductivity is an important parameter of iron-based alloy coating. In many industrial areas (such as boiler, dryer and so on), improving thermal conductivity of coating is essential to save energy cost. The transfer of thermal energy between two iron-based alloy splats is a typical heat conduction. However, in sprayed coating, there are many factors influence its thermal conductivity. In this study, through changing boron content in powder cored wires and annealing process, trying to explain the influence of oxides, impurity atoms and grain size to thermal conductivity of iron-based alloy coating. The experimental results show that, with the increasement of boron content in powder cored wires, the oxides contents of coatings are gradually decreased and thermal conductivities of coatings are rised. Meanwhile, when oxides contents of coatings are relatively low, the thermal conductivities of coatings are declining with the generation of Fe-Cr-B pahse. After annealing process, grains grew up and porosity relatively decreased, both of them made the thermal conductivity of coating enhanced.
机译：导热系数是铁基合金涂层的重要参数。在许多工业领域（例如锅炉，干燥机等），提高涂层的导热性对于节省能源成本至关重要。在两个铁基合金板之间的热能传递是典型的热传导。然而，在喷涂涂层中，有许多因素影响其热导率。本研究通过改变药芯焊丝中的硼含量和退火工艺，试图解释氧化物，杂质原子和晶粒尺寸对铁基合金涂层导热系数的影响。实验结果表明，随着药芯焊丝中硼含量的增加，涂层中的氧化物含量逐渐降低，涂层的热导率提高。同时，当涂层的氧化物含量相对较低时，涂层的热导率随着Fe-Cr-B沥青的产生而下降。经过退火处理后，晶粒长大，孔隙率相对降低，两者均使涂层的导热性增强。

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