The microstructures and mechanical properties of ZrB2 ceramics doped with boron-rich rare-earth borides.
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| Title: | The microstructures and mechanical properties of ZrB2 ceramics doped with boron-rich rare-earth borides. |
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| Authors: | Liu, Hu-Lin1 (AUTHOR) liuhulin@sust.edu.cn, Zhou, Xue-Yang1 (AUTHOR), Yu, Cheng-Long1 (AUTHOR), Man, Zhen-Yong2 (AUTHOR), Xue, Yun-Long1 (AUTHOR), Hai, Ou1 (AUTHOR), Wu, Yuan-Ting1 (AUTHOR) |
| Source: | Ceramics International. Jun2026:Part B, Vol. 52 Issue 15, p29349-29361. 13p. |
| Subjects: | Zirconium boride, Sintering, Fracture toughness, Chemical purification, Boron compounds, Mechanical behavior of materials, Solid solutions, Microstructure |
| Abstract: | ZrB 2 is a key ultra-high-temperature ceramic serving above 2000 °C. Although rare-earth (RE) compounds can tailor the microstructures and properties, the effects of boron-rich RE borides on impurity removal, microstructural evolution, and property regulation remain poorly understood. This study investigated the reactions of LaB 6 , YB 4 and YbB 6 with ZrO 2 , then incorporated YB 4 or YbB 6 into ZrB 2 ceramics to accelerate pressureless sintering densification. The results indicate that these RE borides react with ZrO 2 impurities to in-situ form highly active ZrB 2 above 1600 °C, enhancing ZrB 2 sinterability. YbB 6 outperforms YB 4 in densification due to (Zr, Yb)B 2 solid solution formation during impurity removal. At an optimal 4 mol% YbB 6 content, ZBYb-4 sample achieves 4.73% porosity with 2.41 vol% residual YbB 6. Further addition of B 4 C and C sintering aids suppresses the formation of (Zr, Yb)B 2 solid solution, increasing residual YbB 6 to 7.69 vol%. Both ceramics exhibit reduced Vickers hardness of ∼8.34 GPa but improved fracture toughness of ∼5.53 MPa m1/2, attributed to the intrinsic low hardness and high damage tolerance of the YbB 6 phase. This work provides systematic guidelines for compositional and microstructural design of ZrB 2 -based ceramics. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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