CAJ | 학술논문

采用DH-2080型超音速等离子设备将粒度53~106μm的高铝铜合金粗粉喷涂到45#钢表面制备涂层.在高铝铜合金粉末中加入微量元素Ce和B,研究Ce和B对高铝铜合金粗粉的超音速喷熔性能以及涂层组织结构的影响.结果表明:未加入元素Ce和B的涂层氧化严重,尤其是在界面处聚集大量氧化物,涂层和基体不能实现有效结合,涂层中较多的氧化物和孔隙隔离层流片熔结,并且涂层成分偏析严重.加入微量稀土元素Ce和B后,喷熔层组织细小均匀,成分分布均匀,涂层氧化程度大大减小,涂层和基体结合良好.Ce和 B的加入还可改变涂层组织相的形成规律,即由原来的非平衡结晶方式转变为平衡结晶方式.此外,Ce和 B的加入使涂层硬度由362 HV提高到432 HV.
채용DH-2080형초음속등리자설비장립도53~106μm적고려동합금조분분도도45#강표면제비도층.재고려동합금분말중가입미량원소Ce화B,연구Ce화B대고려동합금조분적초음속분용성능이급도층조직결구적영향.결과표명:미가입원소Ce화B적도층양화엄중,우기시재계면처취집대량양화물,도층화기체불능실현유효결합,도층중교다적양화물화공극격리층류편용결,병차도층성분편석엄중.가입미량희토원소Ce화B후,분용층조직세소균균,성분분포균균,도층양화정도대대감소,도층화기체결합량호.Ce화 B적가입환가개변도층조직상적형성규률,즉유원래적비평형결정방식전변위평형결정방식.차외,Ce화 B적가입사도층경도유362 HV제고도432 HV.
The elements Ce and B with particle size of 53~106μm were added to high-aluminium copper alloy powders, and the coating of the compound alloy powders was prefabricated on 45# steel substrate by supersonic plasma spraying system DH-2080. The effects of Ce and B on the spraying melting performance of coarse high-aluminium copper alloy powders and the coating organization structure were studied. The results show that the coating without Ce and B elements was oxidized seriously and a great deal of oxides aggregate on grain interface, making the coating ineffectiveness bond with substrate, at the same time, the abundant oxides and the melt of hole segregate streamline result in the serious elements segregation in the coating. The coating with trace elements has well-distributed small organization, and its oxidation degree greatly reduces, the coating bonds well with substrate. The trace elements can also made the coating elements homogenization and change the phase formation rules of organization of coatings, making the coating crystallize equilibrium compared to non-equilibrium crystallization of the coating without trace elements. Besides, adding elements Ce and B can increase the coating hardness from 362 HV to 432 HV.