Premium
Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y 2 O 3
Author(s) -
Kumar Pawan,
Nath Mithun,
Roy Utpal,
Ghosh Arup,
Tripathi Himansu Sekhar
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12736
Subject(s) - materials science , magnesite , periclase , microstructure , phase (matter) , flexural strength , grain size , yttrium , mineralogy , metallurgy , composite material , magnesium , chemistry , organic chemistry , oxide
Small amount of Y 2 O 3 (0‐3 wt%) was added into off‐grade natural magnesite and its effects on the phase assemblage, microstructural evolution in correlation with mechanical and thermomechanical properties were investigated. Presence of Y 2 O 3 facilitated the formation of calcium yttrium silicate and yttrialite phases, which prohibited the formation of detrimental‐phase monticellite, which was gradually reduced with the increase in Y 2 O 3 content. Y 2 O 3 promoted periclase grain growth and segregated the secondary phases at triple‐point junction of periclase grains. Also, high‐temperature (at 1200°C) flexural strength of the samples increased from 77.2 MP a (without Y 2 O 3 ) to 137.45 MP a with the addition of 2 wt% Y 2 O 3 . Greater degree of direct bonding among periclase grains, compact microstructure, and uniform grain size distribution in addition to reduced amount of monticellite were responsible for the improvement in mechanical and thermomechanical properties.