Phase evolution, microstructure and properties of Y2O3-doped TiCN-based cermets
来源期刊：JOURNAL OF RARE EARTHS2015年第8期
论文作者：孙万昌 张佩 李攀 佘晓林 赵坤
文章页码：867 - 873
摘 要：Y2O3-doped TiC N-based cermets were prepared by pressureless sintering with powders TiC, TiN, Ni, etc. as main starting materials. The influence of sintering processes and Y2O3 on properties of TiC N-based cermets were investigated. The phase composition of TiC N-based cermets almost had no change with Y2O3 addition. The fullly densified TiC N-based cermets were achieved by P-2 sitering process. The fracture surface showed lots of small dimples caused by hard phase particles pulling-off, and the left hard phase particles were attached to the arborous dendritic matrix. The Vickers hardness, fracture toughness and bending strength of TiC N-based cermets increased firstly and then decreased with the increment of Y2O3 content. When Y2O3 contents were both 0.8 wt.%, compared with the P-1 sintered samples, the Vickers hardness, fracture toughness and bending strength of the P-2 sintered samples reached 14.84 GPa, 8.66 MPa·m1/2 and 660.4 MPa, which were increased by 7.9%, 6.1% and 45.8%, respectively.
孙万昌，张佩，李攀，佘晓林，赵坤
College of Materials Science and Engineering, Xi’an University of Science and Technology
摘 要：Y2O3-doped TiC N-based cermets were prepared by pressureless sintering with powders TiC, TiN, Ni, etc. as main starting materials. The influence of sintering processes and Y2O3 on properties of TiC N-based cermets were investigated. The phase composition of TiC N-based cermets almost had no change with Y2O3 addition. The fullly densified TiC N-based cermets were achieved by P-2 sitering process. The fracture surface showed lots of small dimples caused by hard phase particles pulling-off, and the left hard phase particles were attached to the arborous dendritic matrix. The Vickers hardness, fracture toughness and bending strength of TiC N-based cermets increased firstly and then decreased with the increment of Y2O3 content. When Y2O3 contents were both 0.8 wt.%, compared with the P-1 sintered samples, the Vickers hardness, fracture toughness and bending strength of the P-2 sintered samples reached 14.84 GPa, 8.66 MPa·m1/2 and 660.4 MPa, which were increased by 7.9%, 6.1% and 45.8%, respectively.
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