Preparation of high chromium cast iron-Al2O3-TiC surface composites by pressureless infiltration
SHI Yongliang1.，CAO Lei1.，CHEN Cunguang2.，YANG Fang2.
（1. Department of Materials Engineering, Hebei Vocation University of Industry and Technology, Shijiazhuang
050091, China； 2.Advanced Material & Technology Institute, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract：High chromium cast iron matrix Al2O3-TiC surface composites with a thickness of 3~4 mm were pre‐
pared on the surface of high chromium cast iron by pressureless infiltration of Ti-Al2O3 preform. The microstruc‐
ture and phase composition of the surface composites were analyzed by SEM, EDS and XRD, and the wear resis‐
tance and thermal shock resistance of the surface composites were measured. The results show that the liquid metal
can be quickly induced to permeate the preform through Ti-C reaction with the adding of Ti element to the preform.
In the infiltration layer, Al2O3 particles are tightly combined with the matrix and evenly distribute without cracks
and defects. At high temperature, the transition layer around Al2O3 particles is formed by dissolution and precipita‐
tion of TiC, and the bonding strength between Al2O3 particles and matrix is improved. The wear resistance of the in‐
filtrated layer is 3~4 times that of high chromium cast iron, also it can resist 15 thermal shocks without cracks at
800 ℃.
2023, Vol. 33 
