铁基非晶厚成形涂层的制备

Preparation of Fe-based Amorphous Thick Coating

利用高速电弧喷涂系统制备了FeBSiNb系铁基非晶厚涂层,采用扫描电子显微镜(Scanning Electron Microscope,SEM)、X射线衍射仪(X-Ray Diffraction,XRD)、透射电子显微镜(Transmission Electron Microscopy,TEM)、显微硬度计及万能拉伸试验机,分别对涂层的截面形貌、组织结构、显微硬度及拉伸应力应变进行了表征。结果表明:涂层厚度可达20 mm;涂层组织结构均匀致密,孔隙率在2.5%左右;涂层主要由非晶相及α-Fe相组成,其中非晶含量约为60%;与现有的FeBSiNb系非晶涂层相比,涂层平均显微硬度有所降低,约为826.8 HV0.1,拉伸断裂强度也有所降低,为211 MPa,而弹性应变有所提高,为0.69%。

A thick FeBSiNb amorphous coating is prepared by high velocity arc spray processing. The cross section morphology,microstructure,microhardness and tensile fracture properties of the coating are characterized by Scanning Electron Microscope( SEM),X-Ray Diffraction( XRD),Transmission Electron Microscopy( TEM),micro-hardness tester and multifunctional tensile testing machine respectively.The results indicate that the coating thickness is up to 20 mm,the coating structure is uniform and dense,and the porosity is around 2. 5%. The coating mainly consists of amorphous phase and α-Fe phase,and the amorphous content is about 60%. Compared with the existing Fe BSi Nb amorphous coating,the average microhardness of coating decreases to about 826 HV0. 1,the fracture strength decreases to 211 MPa,while the elastic strain increases to 0. 69%.