YANG Yi ¹, PANG Yuhua ¹, SUN Qi ¹, HE Weiwei ¹, LIU Dong ²

(1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China)

Abstract: In view of the fracture of sucker pipe due to the low toughness and low wear resistance, in order to prepare the ceramic-lined composite steel pipe with promising comprehensive performance, a self-propagating high-temperature synthesis (SHS) was explored to develop Al₂O₃-SiO₂-ZrO₂ system ceramic-lined steel pipe. The main phase of the ceramic layer is α-Al₂O₃, while FeAl₂O₄, Al₂SiO₅ and ZrO₂ are present as minor phases, when the content of ZrO₂ is in the range of 1-3 wt.%. Meanwhile, the crystal grain aspect ratio is significantly increased and the toughness is significantly enhanced. Steel/ceramics are composited through mechanical and diffusion mechanisms, with a interface compression shear strength of 10.46 MPa. With 2 wt.% SiO₂ and 3 wt.% ZrO₂, the relative density of the ceramics layer can be increased to 92.86%. In this case, the hardness can reach 1667 HV, the degree of wear can be reduced to 7.0 mg/h and the fracture toughness can reach 9.28 MPa·m^1/2.

Key words: SHS; fracture toughness; composite pipe; ceramics; friction and wear