1. Combustion Synthesis of High Density ZrN/ZrSi 2 Composite: Influence of ZrO 2 Addition on the Microstructure and Mechanical Properties.
- Author
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Zaki, Zaki I., Alotaibi, Saad H., Alhejji, Bashayer A., Mostafa, Naser Y., Amin, Mohammed A., and Qhatani, Mohsen M.
- Subjects
MICROSTRUCTURE ,ADIABATIC temperature ,SELF-propagating high-temperature synthesis ,ADDITION reactions ,HARDNESS ,DENSITY - Abstract
In this study, a high-density ZrN/ZrSi
2 composite reinforced with ZrO2 as an inert phase was synthesized under vacuum starting with a Zr-Si4 N3 -ZrO2 blend using combustion-synthesis methodology accompanied by compaction. The effects of ZrO2 additions (10–30 wt%) and compression loads (117–327 MPa) on the microstructure, porosity and hardness of the samples were studied. The process was monitored using XRD, SEM, EDS, porosity, density and hardness measurements. Thermodynamic calculations of the effect of ZrO2 addition on the combustion reaction were performed including the calculation of the adiabatic temperatures and the estimation of the fractions of the liquid phase. The addition of up to 20 wt% ZrO2 improved the hardness and reduced the porosity of the samples. Using 20 wt% ZrO2 , the sample porosity was reduced to 1.66 vol%, and the sample hardness was improved to 1165 ± 40.5 HV at 234 MPa. [ABSTRACT FROM AUTHOR]- Published
- 2022
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