Aluminium Magnesium Boride: Synthesis, Sintering And Microstructure

Keywords

Aluminium magnesium boride; hardness; microstructure; spark plasma sintering

Abstract

AlMgB14 ceramics were reported as high-hardness materials over a decade ago. While different synthesis routes for processing of AlMgB14 ceramics were reported in the past, however the synthesis routes are still not optimised and present a significant challenge to the manufacturers. In this work six different synthesis routes were explored for the synthesis of AlMgB14 powder. The synthesised compositions were characterised by XRD, where weight fractions of each phase were calculated by Rietveld refinement. The bulk ceramics were sintered using powder with the highest yield (93.2%) of AlMgB14 phase by spark plasma sintering at 1315°C and 50 MPa. Both phase composition and microstructure of the sintered AlMgB14 were characterised by XRD and SEM/EDS, which revealed the existence of AlMgB14, MgAl2O4 and a small amount of unreacted Al. Hardness and indentation fracture resistance of AlMgB14 ceramics were measured to be 26.7 ± 2.2 GPa and 5.59 ± 0.42 MPa m1/2, respectively by Vickers indentation technique.

Publication Date

8-18-2017

Publication Title

Advances in Applied Ceramics

Volume

116

Issue

6

Number of Pages

341-347

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/17436753.2017.1317116

Socpus ID

85018818698 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85018818698

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