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Some Roles of MgO and TiO 2 in Densification of a Sinterable Alumina
Author(s) -
IKEGAMI TAKAYASU,
KOTANI KAZUO,
Eguchi Katsuya
Publication year - 1987
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.1151-2916.1987.tb04911.x
Subject(s) - sintering , materials science , doping , dopant , dispersion (optics) , grain growth , relative density , mineralogy , chemical engineering , grain size , composite material , optics , chemistry , optoelectronics , physics , engineering
Sinterability of undoped, MgO‐doped, and TiO 2 ‐doped Al 2 O 3 has been examined by applying reported sintering equations. The order of sinterability was MgO‐doped ∼ undoped≪ TiO 2 ‐doped Al 2 O 3 in the initial and intermediate stages of sintering, but a relative sintered density at 1600°C for 1 h occurred in the order undoped < TiO 2 ‐doped < MgO‐doped AI 2 O 3 . The dispersion of thermal grooving angles increased in the order MgO‐doped < undoped < TiO 2 ‐doped Al 2 O 3 , The change of sinterability by the dopants is explained in terms of mobility of mass transfer estimated from a densification rate in the initial‐ and intermediate‐stage sintering and of dispersed driving forces of densification and grain growth qualitatively evaluated from the width of the dispersion of thermal grooving angles.