科研之友
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摘要
The effects of SiC addition on microstructure，mechanical properties，corrosion resistance and wear resistance of vacuum-sintered Ti(C，N)-based cermets were studied．The structure and composition of cermets were analyzed by XRD (X-ray diffraction)，SEM (scanning electron microscopy) and EDS (energy dispersive spectrometer)．The studies show that the addition of SiC changes the microstructure of cermet from black core-gray rim structure to black core-white inner rim-gray outer rim structure，and then to black core-white rim structure．The microstructure of cermets becomes uniform with the addition of SiC content，the grain size decreases，and the mechanical properties first enhance and then weaken．The cermets contained 1.0%SiC have the best comprehensive mechanical properties，bending strength，hardness and fracture toughness reached 2 020 MPa，90.5 HRA and 12.2 MPa∙m1/2，respectively．The corrosion resistance of cermets decreases with the addition of SiC，which is attributed to the decrease in alloy element content in the bonding phase，the appearance of white circular phase and white particles rich in W and Mo，and the presence of pores．The cermets without SiC have the best corrosion resistance．The trend of wear resistance of cermets is the same as that of mechanical properties，which first increases and then weakens．Cermets containing 1.0%SiC have the best wear resistance.
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