Spark plasma sintering of silicon nitride/barium aluminum silicate composite |
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| Affiliation: | 1. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. College of Aeronautical Engineering, National University of Science & Technology (NUST), Pakistan;3. Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;4. Materials and Surface Science Institute, University of Limerick, Limerick, Ireland;1. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia |
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| Abstract: | Si3N4 based composites were successfully sintered by spark plasma sintering using low cost BaCO3, SiO2 and Al2O3 as additives. Powder mixtures were sintered at 1600–1800 °C for 5 and 10 min. Displacement-temperature-time (DTT) diagrams were used to evaluate the sintering behavior. Shrinkage curve revealed that densification was performed between 1100 and 1700 °C. The specimen sintered at 1700 °C showed the maximum relative density (99.8±0.1%), flexural strength (352±16 MPa), Vickers harness (11±0.1 GPa) and toughness (5.6±0.05 MPa m1/2). |
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| Keywords: | Silicon nitride Spark plasma sintering |
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