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Interfacial reactions between Ti and Y 2 O 3 /Ca 4 Ti 3 O 10 composites
Author(s) -
Lu MingWei,
Lin KunLin,
Lin ChienCheng
Publication year - 2019
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.13436
Subject(s) - materials science , titanium , transmission electron microscopy , scanning electron microscope , annealing (glass) , composite material , composite number , calcium titanate , oxygen , hot pressing , analytical chemistry (journal) , ceramic , metallurgy , nanotechnology , chemistry , organic chemistry , chromatography
In titanium casting, the interfacial reactions between selected Y 2 O 3 /Ca 4 Ti 3 O 10 composites in contact with titanium at 1600°C for 30 minutes in an argon environment were characterized using X‐ray diffraction, scanning electron microscopy, and analytical transmission electron microscopy. Before contact with titanium, reaction phases of the Y 2 O 3 /Ca 4 Ti 3 O 10 composites formed through hot pressing at 1500°C or annealing at 1600°C. These phases were identified as Ca 4 Ti 3 O 10 , Y 2 O 3 , and minor amounts of CaO. The amount of Ca 4 Ti 3 O 10 in the composites gradually decreased as the amount of Y 2 O 3 increased. When the Y 2 O 3 /Ca 4 Ti 3 O 10 composites were in contact with titanium, a reaction layer of α‐Ti and Y 2 O 3 was formed near the interface of the composite side. Large amounts of calcium and oxygen were expelled toward the composite side from Ca 4 Ti 3 O 10 near the interface to form CaO, which precipitated in the Ca 4 Ti 3 O 10 and Y 2 O 3 phases. Furthermore, no reaction phases were detected in titanium. Ca 4 Ti 3 O 10 and Y 2 O 3 can function as diffusion barrier layers to effectively suppress the diffusion of oxygen into titanium.