CAJ | 학술논문

为了改善涂层的组织和性能，对超音速等离子喷涂技术制备的高铝青铜涂层进行高频感应重熔处理，研究重熔后涂层的微观组织结构特征和界面结合状态.感应重熔前涂层具有层流状组织特点，含有少量氧化渣、孔隙及未完全熔融颗粒，涂层与基体间以机械结合为主.感应重熔能消除未熔颗粒和夹杂，使组织致密、均匀，组织的层流特征弱化，孔隙率有所下降.基体元素和涂层元素相互扩散，在界面形成一条明显的白亮带，呈冶金结合状态，结合牢固，涂层的结合性能有所改善.重熔后扩散带和涂层表面的硬度较高，界面结合强度也由重熔前的25.110提升至83.358 MPa.
위료개선도층적조직화성능，대초음속등리자분도기술제비적고려청동도층진행고빈감응중용처리，연구중용후도층적미관조직결구특정화계면결합상태.감응중용전도층구유층류상조직특점，함유소량양화사、공극급미완전용융과립，도층여기체간이궤계결합위주.감응중용능소제미용과립화협잡，사조직치밀、균균，조직적층류특정약화，공극솔유소하강.기체원소화도층원소상호확산，재계면형성일조명현적백량대，정야금결합상태，결합뢰고，도층적결합성능유소개선.중용후확산대화도층표면적경도교고，계면결합강도야유중용전적25.110제승지83.358 MPa.
To improve the microstructure and properties of high-aluminum bronze coatings prepared by supersonic plasma spra-ying, the coatings were remelted with a high-frequency induction system. The microstructure characteristics and interface bonding state of the coatings were studied by metallurgical microscopy, scanning electron microscopy, X-ray diffraction, energy dispersion analysis, porosity measurement, microhardness testing and mechanical strength testing. It is indicated that laminar structure characteristics and a small amount of oxidation slag, pores and incompletely melted particles exist in the coating before remelting. Mechanical combination is the main way to join the matrix and the coating. Incompletely melted particles and laminar structure characteristics are lessened in the coating after remelting. The porosity of the coating after remelting is lower than before remelting. A white metallurgical band forms in the interface because of element diffusion between the matrix and the coating, which would enhance the adhesion. A higher hardness is observed in both the diffusion zone and the surface of the remelting coating, and the interfacial bonding strength increases from 25.110 before remelting to 83.358 MPa after remelting.