Abstract
The microstructure and mechanical properties of Ti(C,N)-based cermets with the addition of the SiC particles (SiCp) and SiC whiskers (SiCw), were systematically studied in this work. Firstly, the effect of SiCp on the cermets was investigated independently to determine the considerable total amounts of additives, and the results showed that 2.0 wt.% SiCp would lead to optimal properties of the cermet. Then, the influence of SiCp and SiCw additions with the variable ratio on the cermets was studied. The results indicated that when 1.5 wt.% SiCp and 0.5 wt.% SiCw were added; the cermets appeared with the best comprehensive properties, and the transverse rupture strength, hardness, and the fracture toughness of the cermets reached 2520.8 MPa, 88.0 HRA, and 16.56 MPa·m1/2, respectively. This was due to the synergistic strengthening and toughening effect afforded by the reasonable SiCp and SiCw addition, from which the smallest grain size, as well as the most uniform, and completed core-rim structure of the cermets, were achieved.
Highlights
Ti(C,N)-based cermets were widely applied in mechanical processing, metallurgy, and oil drilling fields as cutting tools and wearing parts, due to the excellent red hardness, wear resistance, and considerable strength and toughness
Many scholars have adopted a variety of methods to improve the transverse rupture strength and fracture toughness of Ti(C,N)based cermets, such as particle toughening, whisker toughening, etc
Zhang et al [3] investigated the effect of a nano-Si3 N4 addition on the mechanical properties of Ti(C,N)-based cermet prepared by microwave sintering, and reported that the hardness and transverse rupture strength of cermet was improved by about 1.3% and 25.2% with a 2.0 wt.% Si3 N4 addition
Summary
Ti(C,N)-based cermets were widely applied in mechanical processing, metallurgy, and oil drilling fields as cutting tools and wearing parts, due to the excellent red hardness, wear resistance, and considerable strength and toughness. It was identified as the substitution of cemented carbide, as the higher hardness and wear resistance allowed for more stable chemical properties, a stronger corrosion resistance, oxidation resistance, and smaller density [1,2]. Many scholars have adopted a variety of methods to improve the transverse rupture strength and fracture toughness of Ti(C,N)based cermets, such as particle toughening, whisker toughening, etc. Zhao et al [5] revealed that TiC nanoparticles and SiCw addition in hot-pressed Al2 O3 ceramic would cause transgranular fracture and crack deflection, which improved the transverse rupture strength and fracture toughness. SiCw and SiCp with different ratios were added into the cermets to research the synergetic mechanism role
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