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Reaction between Calcium‐Doped Lanthanum Chromite and Silica
Author(s) -
Horita Teruhisa,
Choi JinSam,
Lee YouKee,
Sakai Natsuko,
Kawada Tatsuya,
Yokokawa Harumi,
Dokiya Masayuki
Publication year - 1995
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.1151-2916.1995.tb08882.x
Subject(s) - chromite , lanthanum , chromium , oxide , inorganic chemistry , calcium silicate , calcium oxide , silicate , lanthanum oxide , materials science , reaction mechanism , mineralogy , chemistry , metallurgy , catalysis , composite material , organic chemistry
Calcium‐doped lanthanum chromite reacted with silica to form silicates and chromium oxide at 1473‐1773 K. A reaction mechanism was proposed at each temperature. At 1473 K, a reaction zone was observed in two areas: one was the bulk reaction area where silicates and chromium oxide were formed near the reaction interface; the other was the grain boundary reaction area where chromium oxide and calcium silicate spots were formed far from the reaction interface. Above 1673 K, silicates in the La 2 O‐CaO‐SiO, system and chromium oxide were formed simultaneously in the reaction zone with no grain boundary reaction. No layered reaction products were observed in the reaction zone of the lanthanum chromite side. Formation of melt silicates above 1723 K at the reaction interface resulted in strong bonding between calcium‐doped lanthanum chromite and silica.