Research article
Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites
- 1 Department of Mechanical Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
- 2 Department of Mechanical Engineering, York University, Toronto, ON, Canada
- 3 Saskpower Queen Elizabeth Power Station, 2211 Spadina Cres. W., Saskatoon, SK, S7M 5V5, Canada
Abstract
The incorporation of 1 wt% hexagonal BN (hBN) into ZrB2–30 vol% SiC could noticeably better the fracture toughness, hardness, and consolidation behavior of this composite. This research intended to scrutinize the effects of various amounts of hBN (0–5 wt%) on different characteristics of ZrB2–SiC materials. The hot-pressing method under 10 MPa at 1900 °C for 120 min was employed to sinter all designed specimens. Afterward, the as-sintered samples were characterized using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), and Vickers technique. The hBN addition up to 1 wt% improved relative density, leading to a near fully dense sample; however, the incorporation of 5 wt% of such an additive led to a composite containing more than 5% remaining porosity. The highest Vickers hardness of 23.8 GPa and fracture toughness of 5.7 MPa.m1/2 were secured for the sample introduced by only 1 wt% hBN. Ultimately, breaking large SiC grains, crack bridging, crack deflection, crack branching, and crack arresting were introduced as the chief toughening mechanisms in the ZrB2–SiC–hBN system.
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Keywords:
Ultrahigh temperature ceramics, Hot-pressing, Microstructure, Mechanical properties
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Cited By
Submitted
2021-04-20
Available online
2021-05-08
How to Cite
Haghgooye Shafagh, S., Jafargholinejad, S., & Javadian, S. (2021). Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites. Synthesis and Sintering, 1(2), 69-75. https://doi.org/10.53063/synsint.2021.1224
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Copyright (c) 2021 Saber Haghgooye Shafagh, Shapour Jafargholinejad, Siyamak Javadian
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