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Open AccessArticle

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

1
College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
2
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3
Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450052, China
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College of Civil Engineering and Architecture, Quzhou University, Quzhou 32400, Zhejiang, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 785; https://doi.org/10.3390/ma13030785
Received: 2 December 2019 / Revised: 5 February 2020 / Accepted: 6 February 2020 / Published: 9 February 2020
(This article belongs to the Special Issue High Temperature Ceramic Materials)
MoAlB fine powders were prepared in molten NaCl from Al, B and Mo powders. The effects of key parameters affecting the synthesis process and phase morphology were examined and the underpinning mechanisms proposed. MoAlB product particles exhibited different shapes/sizes, as follows: spherical grains (1~3 μm), plate-like particles (<5 μm in diameter) and columnar crystals with lengths up to 20 μm and diameters up to 5 μm, resultant from different reaction processes. Phase pure MoAlB was synthesised under the following optimal conditions: use of 140% excess Al and 6 h of firing at 1000 °C. This temperature was at least 100 °C lower than required by other methods/techniques previously reported. At the synthesis condition, Mo first reacted with Al and B, forming Al8Mo3 and MoB, respectively, which further reacted with excess Al to form Al-rich Al–Mo phases and MoAlB. The Al-rich Al–Mo phases further reacted with the residual B, forming additional MoAlB. The molten NaCl played an important role in accelerating the overall synthesis process. View Full-Text
Keywords: MoAlB; molten salt synthesis; low temperature; NaCl; boron MoAlB; molten salt synthesis; low temperature; NaCl; boron
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MDPI and ACS Style

Liu, C.; Hou, Z.; Jia, Q.; Liu, X.; Zhang, S. Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl. Materials 2020, 13, 785.

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