Polycrystalline LaNbO4 and LaNbO4/Al2O3 composites were fabricated by a PECS (Pulse Electric Current Sintering) process to obtain the dense sintered materials. XRD analyses revealed that LaNbO4/Al2O3 composites consisted of LaNbO4 and Al2O3. SEM observations revealed that added Al2O3 particles prohibited the matrix grain growth. Fracture strength, Vickers hardness and Young's modulus increased with increasing Al2O3 content. The monoclinic-to-tetragonal phase transformation behavior was investigated by thermomechanical analysis (TMA) for LaNbO4 monolith and LaNbO4/Al2O3 composites. The volume changes at the phase transition were observed for all the samples. The monoclinic-to-tetragonal transition temperature decreased with decreasing matrix grain size. Indentation load-depth hysteresis loops for LaNbO4/5 vol% Al2O3 composite exhibited the loading rate sensitivity.
|ジャーナル||Key Engineering Materials|
|出版ステータス||Published - 1999|
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