辉光渗钽层的制备与烧蚀性能

Preparation of Glow Discharge Tantalum Coating and Its Ablation Properties

为了研究渗钽层对合金表面烧蚀性能的影响,利用双层辉光等离子渗金属的方法,在34CrNi3Mo钢表面制备了渗钽层,研究了渗钽层的表面形貌、相结构、元素分布、硬度以及渗层与基体结合力的变化情况,并对其烧蚀性能和耐蚀性能进行试验研究.结果表明:渗钽层主要由体心立方α相钽组成,沉积层深度约为10μm,扩散层深度约5μm;渗钽层表面硬度约500HV_(0.2),与基体的结合力约65N;在相同的工况下,渗钽层的耐烧蚀性能优于基体,并能够阻止C、N与基体形成脆化层;随着脉冲烧蚀次数增加,烧蚀面积增大,但烧蚀深度均较浅;在高功率脉冲烧蚀工况下,渗钽层可以减轻金属的熔融和气化,从而提高了基体的耐烧蚀性能.

In order to study the effect of Ta layer on the corrosion resistance of the alloy surface,the diffused layer was prepared on the 34 CrNi3 Mo steel surface by double glow plasma infiltration.The surface morphology,phase structure,element distribution,hardness change and the adhesion between the infiltrated layer and the substrate were investigated.The ablation property and corrosion resistance of Ta layer were analyzed.The results show that Ta layer is mainly composed of BCCα-Ta composition with the deposition layer depth of about 10μm and diffusion layer depth of about 3μm.The surface layer hardness is about 500 HV_(0.2) and the bonding strength is about 65 N.Under the same working condition,the corrosion resistance of Ta layer is better than that of matrix,which can prevent the formation of the embrittlement between C/N and matrix.With the increasing numbers of pulse ablation,the ablation area increases but the ablation depth maintains shallow.In the case of the high power pulse ablation,the Ta layer can decrease the melting and vaporization process,and improve the ablation resistance of the matrix.