1. Si-B-C-N monoliths with LaB6-induced well-developed BN(C) flakes.
- Author
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Liang, Bin, Yang, Zhihua, Miao, Yang, Zhu, Qishuai, Liao, Xingqi, Li, Quan, Tian, Zhuo, Jia, Dechang, and Zhou, Yu
- Subjects
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SILICON compounds , *MONOLITHIC reactors , *CERAMIC materials , *MECHANICAL alloying , *SINTERING , *METAL microstructure , *FRACTURE toughness - Abstract
Si-B-C-N ceramic monoliths with LaB 6 additive were prepared by mechanical alloying followed by spark plasma sintering. The microstructures and mechanical properties were investigated compared to LaB 6 -free Si-B-C-N counterparts. After sintered at 1900 °C/50 MPa, the La/Si-B-C-N monoliths provide well-developed BN(C) flakes (≤100 nm in thickness) and improved fracture toughness, while the BN(C) ones show no lamellar microstructures in Si-B-C-N systems. The solid-solution of La in BN(C) grains promotes ordered arrangement of BN(C) along the (0002) plane causing in situ growth of BN(C) thus leading to an increase in toughness by 40% (from 5.6 to 7.8 MPa m −1/2 ). [ABSTRACT FROM AUTHOR]
- Published
- 2017
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