Microstructures and mechanical properties of SiBCNAl ceramics produced by mechanical alloying and subsequent hot pressing |
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Authors: | Dan Ye De-chang Jia Zhi-hua Yang Zhen-lin Sun and Peng-fei Zhang |
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Institution: | (1) State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China;(2) Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, 100022, China;(3) School of Materials Science and Engineering, Shijiazhuang Railway Institute, Hebei, 050043, China; |
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Abstract: | Amorphous SiBCNAl powders were prepared via a mechanical alloying (MA) technique using crystalline silicon (Si), hexagonal
boron nitride (h-BN), graphite (C), and aluminum (Al) as starting materials. SiBCNAl powders were consolidated by a hot pressing
(HP) technique at 1800 °C under a pressure of 30 MPa in argon and nitrogen. The sintering atmosphere had a great influence
on the microstructures and mechanical properties of the ceramics. The two ceramics had different phase compositions and fracture
surface morphologies. For the ceramics sintered in argon, flexural strength, fracture toughness, elastic modulus and Vickers
hardness were 421.90 MPa, 3.40 MPa·m1/2, 174.10 GPa, and 12.74 GPa, respectively. For the ceramics sintered in nitrogen, the mechanical properties increased, except
for the Vickers hardness, and the values of the above properties were 526.80 MPa, 5.25 MPa·m1/2, 222.10 GPa, and 11.63 GPa, respectively. |
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Keywords: | SiBCNAl ceramics Hot pressing (HP) Mechanical properties Microstructure Mechanical alloying (MA) |
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