Synthesis of stoichiometric Y2Si2O7 powders by sonohydrolysis-assisted sol–gel route

Characterization and Formation of Yttrium Disilicate Nanocrystalline Powders by EDTA–Citric Acid Complexing Process

“…have found that the porous SiC membrane support was not suitable for application in high‐temperature and water vapor atmosphere because of the observed decrease in porosity and pore size. Yttrium disilicate (Y 2 Si 2 O 7 ) materials have attracted many attentions in high‐temperature structural applications, and especially, it could be used as ceramic coating or separation membrane materials due to its high thermal stability, high melting point (1775°C), low thermal conductivity, good thermal shock resistance, very close thermal expansion coefficient, and good mechanical and chemical compatibility when used together with SiC matrix . As a result, the preparation and the enhanced performances of high‐temperature silicon‐based ceramics using yttrium disilicate and SiC as raw materials are potentially feasible.…”

“…Attempts to get pure phase Y 2 Si 2 O 7 without parasitic polymorphism ( y ‐Y 2 Si 2 O 7 ) or nonstoichiometric compound Y 4.67 (SiO 4 ) 3 O are almost impossible by the conventional solid‐state, hydrothermal, and sol–gel methods. Several groups have synthesized and studied some performances of Y 2 Si 2 O 7 materials. Their studies have demonstrated that the single‐phase synthesis of stoichiometric Y 2 Si 2 O 7 is full of difficulties.…”

“…In fact, long synthesis time, expensive precursors, and special apparatus are undesirable to form Y 2 Si 2 O 7 . Although the synthesis of single‐phase yttrium disilicate can be accomplished by a modified sol–gel approach, the required polymorph of stoichiometric Y 2 Si 2 O 7 after thermal treatment is actually determined by many experimental parameters including sol precursor concentration, composition, catalyst, aging times as well as hydrolysis temperature and calcined conditions, even the purity degree of starting chemicals used . Thus, we try to develop a novel route, a modified Pechini process, to synthesize the nanocrystalline Y 2 Si 2 O 7 powders.…”

Preparation, microstructure and high temperature performances of porous γ-Y2Si2O7 by in situ foam-gelcasting using gelatin

“…The typical methods for fabricating Y 2 Si 2 O 7 include the conventional solid-state reaction of mixed Y 2 O 3 and SiO 2 powders and the calcination of yttrium disilicate precursors synthesized by sol-gel and hydrothermal processing [30][31][32][33][34][35]. In this work, single-phase porous γ-Y 2 Si 2 O 7 ceramic was synthesized by the in situ reaction sintering foam-gelcasting method using natural gelatin.…”