等离子喷涂工艺参数对B_4C涂层性能的影响

Effect of Spraying Parameter on the Properties of B_4C Coating

本文研究了喷涂距离对大气等离子喷涂B4C涂层的沉积效率、气孔率、显微硬度和抗热震性能的影响。发现喷涂距离会严重影响B4C粉末在等离子体射流中的熔融状态，从而对这些性能产生显著影响。实验结果表明，通过优化工艺参数，尤其是选择适当的喷涂距离，可以在大气喷涂条件下制得同高压等离子喷涂相近气孔率和显微硬度的B4C涂层。

Boron carbidc coating has been used in fusion plant, wear resistance field and semiconductor industry due to its high thermal conductivity, microhardness and good thermal shock resistance. The effect of spraying distance on the deposition efficiency, porosity, life of the thermal shock resistance of boron carbide coating was studied. The results obtained in-dicated: The spraying distance was a very key factor, which has marked effect on the proper-ties of boron carbide coating. In this work, the boron carbide coation with low porosity, high microhardness and good life of thermal shock resistance was been deposited by the control of spraying distance. The relationship between the properties of B4C coatings and their spraying distance was discussed.