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Journal article
Synthesis and Characterization of an Alumina Forming Nanolaminated Boride: MoAlB
Scientific reports, Vol.6(1), pp.26475-26475
25 May 2016
PMCID: PMC4879536
PMID: 27220751
Abstract
The 'MAlB' phases are nanolaminated, ternary transition metal borides that consist of a transition metal boride sublattice interleaved by monolayers or bilayers of pure aluminum. However, their synthesis and properties remain largely unexplored. Herein, we synthesized dense, predominantly single-phase samples of one such compound, MoAlB, using a reactive hot pressing method. High-resolution scanning transmission electron microscopy confirmed the presence of two Al layers in between a Mo-B sublattice. Unique among the transition metal borides, MoAlB forms a dense, mostly amorphous, alumina scale when heated in air. Like other alumina formers, the oxidation kinetics follow a cubic time-dependence. At room temperature, its resistivity is low (0.36-0.49 mu Omega m) and - like a metal - drops linearly with decreasing temperatures. It is also a good thermal conductor (35 Wm(-1)K(-1) at 26 degrees C). In the 25-1300 degrees C temperature range, its thermal expansion coefficient is 9.5 x 10(-6) K-1. Preliminary results suggest the compound is stable to at least 1400 degrees C in inert atmospheres. Moderately low Vickers hardness values of 10.6 +/- 0.3 GPa, compared to other transition metal borides, and ultimate compressive strengths up to 1940 +/- 103 MPa were measured at room temperature. These results are encouraging and warrant further study of this compound for potential use at high temperatures.
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Details
- Title
- Synthesis and Characterization of an Alumina Forming Nanolaminated Boride: MoAlB
- Creators
- Sankalp Kota - Drexel UniversityEugenio Zapata-Solvas - Imperial College LondonAlexander Ly - Drexel UniversityJun Lu - Linköping UniversityOmar Elkassabany - Drexel UniversityAmanda Huon - Drexel UniversityWilliam E. Lee - Imperial College LondonLars Hultman - Linköping UniversitySteve J. May - Drexel UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Scientific reports, Vol.6(1), pp.26475-26475
- Publisher
- Springer Nature
- Number of pages
- 9
- Grant note
- Leverhulme Trust EP/J021199/1 / Engineering and Physical Sciences Research Council; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC) W911NF-11-1-0525 / Army Research Office EP/M018563/1 / EPSRC; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991019167761204721
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