标题：Microstructure and wear resistance of TiB2-TiC/Fe composite coatings on Q235 steel prepared by plasma cladding
作者：Bi, Wenbiao ;Cui, Hongzhi ;Zhang, Xinjie ;Wang, Jiafeng ;Wang, Mingliang
作者机构：[Bi, Wenbiao ;Cui, Hongzhi ;Zhang, Xinjie ;Wang, Jiafeng ;Wang, Mingliang ] College of Materials Science and Engineering, Shandong University of Scien 更多
来源：Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
摘要：TiB2-TiC/Fe composite coatings were fabricated on the surface of Q235 steel via plasma cladding by used Ti, B4C, and Fe55 as precursor materials. The phase composition, structure, microhardness and friction wear resistance of TiB2-TiC/Fe coatings were analyzed, and the wear mechanism was also discussed. The results show that the TiB2-TiC/Fe composite coatings mainly consist of TiB2, TiC and α-Fe. TiB2 phase presents rectangle or multilateral shape, and TiC phase is irregular patch shape. With the increase of ceramic content in TiB2-TiC/Fe composite coatings, the sizes of TiB2 and TiC enlarge gradually and the TiB2-TiC/Fe composite coatings are closely and metallurgically combined with Q235 steel substrate. The wear resistance and hardness of TiB2-TiC/Fe composite coatings can improve with the increasing of ceramic contents in the coatings, while the wear resistance declines when ceramic content increases to some extent (35wt%) in TiB2-TiC/Fe composite coatings. The wear mechanism of TiB2-TiC/Fe composite coatings are mainly abrasive and delaminate wear. The plasma cladding coating with 30wt% ceramic content has lower wearing volume, and the wear resistance of the coating is 7 times to that of Q235 steel. When the content of Ti+B4C continues to increase, the size and defects of ceramic phase increase and the wear resistance of the coatings reduces eventually.
© 2018, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.