Formation and dispersal of rod-like α-SiAlON seed crystals synthesized by combustion method
(1.Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal2.State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China)
Abstract: Rod-like single-phase seed crystals of yttrium-α-SiAlONs were synthesized by combustion synthesis method. The XRD patterns, the morphologies of products and formation mechanism were investigated. The SEM observation of crystals exhibits well developed elongated hexagonal crystals with highly agglomerative features, assigned to pure and well-crystallized α-SiAlON. After special chemical treatments and water washing, the powders are well dispersed and still keep elongated hexagonal crystals, and the XRD pattern shows that the rod-like structure is crystalline yttrium-α-SiAlON with only a trace of β-SiAlON.
Key words: rod-like seed crystals； Y-α-SiAlON； combustion synthesis