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The Production of Transparent MgAl 2 O 4 Ceramic Using Calcined Powder Mixtures of Mg ( OH ) 2 and γ‐ Al 2 O 3 or AlOOH
Author(s) -
Sutorik Anthony C.,
Gilde Gary,
Swab Jeffrey J.,
Cooper Christopher,
Gamble Robert,
Shanholtz Eugene
Publication year - 2012
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/j.1744-7402.2011.02679.x
Subject(s) - materials science , knoop hardness test , flexural strength , hydroxide , calcination , ceramic , transmittance , nuclear chemistry , analytical chemistry (journal) , corundum , magnesium , mineralogy , composite material , metallurgy , indentation hardness , chemical engineering , chromatography , microstructure , chemistry , biochemistry , optoelectronics , engineering , catalysis
Magnesium hydroxide, Mg ( OH ) 2 (both 99% and 99.99% purity grades), γ‐ Al 2 O 3 , and AlOOH have been investigated for the direct production of transparent MgAl 2 O 4 . The highest average in‐line transmittance through 3.5–4 mm thick samples is 84.2 ± 1.0% at 550 nm, attained by using mixtures of 99.99% pure Mg ( OH ) 2 and γ‐ Al 2 O 3 . Other formulations exhibited 77–80% visible transmission, suggesting that further optimization can improve sample consistency. All samples exhibited a Knoop hardness of ~12 GPa, and elastic modulus of ~280 GPa. Biaxial flexural strength measurements ranged from 85 to 136 MPa depending on starting materials.