Effect of WC and Si additions on the mechanical properties of ZrB2-WC-Si based cermet

National Conference on Processing and Characterization of Materials

Rout, R.R.^1 ; Mishra, B.^1 ; Sahoo, N.^1 ; Karak, S.K.^2

Dalmia Institute of Scientific and Industrial Research, Rajgangpur, India^1

National Institute of Technology, Rourkela

Odisha, India^2

关键词: Hydraulic press;    Inert atmospheres;    Intergranular;    Mass loss;    Mechanical behavior;    Si addition;    Spark plasma;    Weight percentages;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/178/1/012034/pdf
DOI  :  10.1088/1757-899X/178/1/012034

来源: IOP

【 摘 要 】

The present paper deals with the study of mechanical behavior of ZrB2-WC-Si cermets with respect to variation in weight percentage of ZrB2, WC and Si. Pellets are pressed in hydraulic press with a load of 6T followed by sintering though spark plasma at 1800°C under inert atmosphere. Vickers hardness test of the cermet ZrB2-60-WC-20-Si-20 showed hardness of 27.5 GPa where as it was quiet lower in case of cermets ZrB2-60-WC-10-Si-30 and ZrB2-60-WC-15-Si-25. Wear test showed that the mass loss became lower in case of ZrB2-60-WC-20-Si-20 in comparison to other cermets. This was attributed to the formation of metastable phases of WSi2and SiC those are responsible for the increase in hardness of the cermet. Resulting matrix became stronger and also intergranular-intragranular region became densified. Furthermore, this effect was supposed to reduce matrix wear of the cermet having composition ZrB2-60-WC20-Si-20.