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Effect of Firing Atmosphere on Sintered and Mechanical Properties of Vanadium‐Doped Alumina
Author(s) -
Wakamatsu Mitsuru,
Ishida Shingo,
Takeuchi Nobuyuki,
Hattori Tetsuyuki
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04103.x
Subject(s) - vanadium , sintering , oxidizing agent , materials science , grain boundary , grain growth , doping , flexural strength , metallurgy , reducing atmosphere , phase (matter) , atmosphere (unit) , grain size , composite material , microstructure , chemistry , physics , optoelectronics , organic chemistry , thermodynamics
Vanadium‐doped alumina was sintered at 1650°C in both an oxidizing (O) and a reducing (R) atmosphere and the sintered bodies examined. In the O‐sintered body, vanadium was present preferentially between the alumina grains, forming a phase (AlVO 4 ). In the R‐sintered body, on the other hand, most of the vanadium was dissolved in alumina as V 3+ , and a small proportion of the vanadium was present as V 4+ in the grain‐boundary region. During O sintering, V 2 O 5 doping depressed both densification and grain growth, whereas R sintering had no effect on densification but did depress grain growth. The O‐sintered, V‐doped body exhibited low flexural strength and hardness, whereas the R‐sintered body showed comparatively high hardness.