Open AccessIsothermal Oxidation of SLM fabricated Mo(Si1-xAlx)2-based composite
Author(s) -
Tatevik Minasyan,
Le Liu,
Ehsan Toyserkani,
Irina Hussainova
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1140/1/012003
Subject(s) - materials science , spark plasma sintering , isothermal process , composite number , oxide , layer (electronics) , dwell time , sintering , chemical engineering , metallurgy , composite material , physics , engineering , thermodynamics , medicine , clinical psychology
Near full dense C40 hexagonal structured Mo(Si 1-x Al x ) 2 -based composite coupons with 7 mm diameter by 7 mm height were prepared by selective laser melting (SLM) of MoSi 2 -30 wt.% AlSi10Mg powder mixture and subjected to isothermal oxidation. As a reference, MoSi 2 bulk sample was prepared by spark plasma sintering (SPS) technique. The quantitative oxidation tests were conducted in dry air atmosphere at 500 °C for 72 and 120 hours with three specimens for each dwell time. The estimated weight change after 120 h oxidation accompanied with the SEM analysis revealed the slow oxidation of the SPS prepared MoSi 2 bulk sample without evidence of pesting, however, the formed oxide layer was not protective and contained large cracks and multiple microcracks. The SLM produced sample showed remarkably slower oxidation rate as well as the formation of only a nanoscale oxide layer, highlighting the significant influence on Al additive to enhance MoSi 2 oxidation resistance, thus making the developed material promising to be used as heating element.