Effects of Cr and Zr Addition on Microstructures, Compressive Properties, and Abrasive Wear Behaviors of In Situ TiB₂/Cu Cermets.

Feng Qiu,Xiujuan Li,Jianbang Lu,Baixin Dong,Xiangzheng Duan,Hongyu Yang

doi:10.3390/ma11081464

Abstract

In situ micro-TiB2/Cu cermets with a different TiB2 content (40, 50, and 60 vol %) were successfully fabricated by combustion synthesis (CS) and hot press consolidation in Cu-Ti-B systems. In addition, different contents of Cr and Zr were added to the Cu-Ti-B systems. The microstructure, mechanical properties, and abrasive wear properties of the TiB2/Cu cermets were investigated. As the ceramic content increased, the yield strength and compressive strength of the cermets were found to increase, while the strain decreased. An increase in load and abrasive particle size caused the wear volume loss of the TiB2/Cu cermets to increase. When the ceramic content was 60 vol %, the wear resistance of the TiB2/Cu cermets was 3.3 times higher than that of pure copper. The addition of the alloying elements Zr and Cr had a significant effect on the mechanical properties of the cermets. When the Cr content was 5 wt %, the yield strength, ultimate compressive strength, and microhardness of the cermets reached a maximum of 997 MPa, 1183 MPa, and 491 Hv, respectively. Correspondingly, when the Zr content was 5 wt %, those three values reached 1764 MPa, 1967 MPa, and 655 Hv, respectively, which are 871 MPa, 919 MPa, and 223 Hv higher than those of the unalloyed cermets. The wear mechanism of the in-situ TiB2/Cu cermets, and the mechanisms by which the strength and wear resistance were enhanced by the addition of Zr, were preliminarily revealed.

Highlights

With the development of large-scale integrated circuits and high-power precision instruments, the application of new electronic packaging and heat sink materials has received widespread attention [1,2,3,4]
Zhang et al [8] studied that the compression properties and electrical conductivity of in situ 20 vol % nano-sized TiCx /Cu composites fabricated via combustion synthesis and hot press in
In situ micro-TiB2 /Cu cermets with a different TiB2 content (40, 50, and 60 vol %) were successfully successfully fabricated by combustion synthesis and hot press consolidation in Cu-Ti-B-(Cr/Zr) fabricated by combustion synthesis and hot press consolidation in Cu-Ti-B-(Cr/Zr) systems

Summary

Introduction

With the development of large-scale integrated circuits and high-power precision instruments, the application of new electronic packaging and heat sink materials has received widespread attention [1,2,3,4]. Ceramic particle-reinforced Cu matrix cermets have high strength and hardness, good wear resistance, and oxidation resistance, a low coefficient of thermal expansion, and a simple preparation process, spurring their rapid development in recent years [12]. Adding TiB2 particles as a reinforcing phase into the Cu matrix maintains the good thermal and electrical conductivity of Cu [17,18], and improves the strength and wear resistance of the material [19,20,21,22]. Zhang et al [8] studied that the compression properties and electrical conductivity of in situ 20 vol % nano-sized TiCx /Cu composites fabricated via combustion synthesis and hot press in. The Cu-Ti-B system was selected as the research object, and in situ TiB2 /Cu cermets with high hardness, strength, and wear resistance were successfully fabricated by CS combined with hot press consolidation. The wear mechanism of the in-situ TiB2 /Cu cermets, and the mechanisms by which their strength and wear resistance were greatly enhanced by the addition of Zr, were preliminarily revealed

Experimental Procedures

Results and Discussion

X-ray cermets:

12. Variation

Conclusions