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Effect of Cr Addition on Microstructure and Properties of Ti (C, N)-Based Cermet

CHEN Yucong , TAN Jian , HUANG Ting , LIU Weikang , HUANG Yingying ,
1
1
2
1
2
WU Bingkun , YAO Zhenhua 1
1
(1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. New Tobacco Products Engineering Center, China Tobacco Hubei Industrial Co., Ltd., Wuhan 430040, China)
Abstract: With TiC, TiN, WC, Mo powder, Cr 3 C 2 as bonded phase raw materials, nickel powder and Cr powder
as binders (the total mass fraction was 25%, and the mass fraction of Cr powder was 0, 2.5%, 5.0%, 7.5%), different
Ti(C, N)-based cermets were prepared by vacuum sintering process. The effect of Cr addition on the microstructure,
mechanical properties and antioxidant properties of the cermet was investigated. The results show that the grains of Ti
(C, N)-based cermets with different Cr content all exhibited the core-ring structure, whose core phase was Ti (C, N) and
ring phase was (Ti, W, Mo, Cr) (C, N) multivariate solid solution. With the increase of Cr addition, the cermet grain
size became significantly larger, and the homogeneity of the ring phase deteriorated. With the increase of Cr addition,
the hardness of the cermet increased, the flexural strength decreased, and the fracture toughness first increased and then
decreased. When the mass fraction of Cr in the binder phase was 5.0%, the comprehensive mechanical properties of
the cermet were the best with the flexural strength, hardness, and fracture toughness of 1 829 MPa, 90.5 HRA, and
1/2
11.57 MPa · m , respectively. When the mass fraction of Cr in the binder phase was 5.0%, the oxidation mass increase
per unit area of the cermet was lower than that without Cr addition, and the denser oxide film containing NiCr 2 O 4 and
CrMoO 4 was formed on the cerment surface during the oxidation process. The dense oxide film effectively impeded the
further diffusion of the oxygen element and enhanced the antioxidant performance of the substrate.
Key words: Cr addition; Ti (C, N)-based cermet; microstructure; mechanical property; antioxidant property

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