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β-Si 3 N 4 seed crystals were synthesized by sintering (α+β)-Si 3 N 4 powders with Y 2 O 3 +MgO additives at 1800°C. Full α- to β-phase transformation was achievable at 1800°C for 1h. The pre-existing β-Si 3 N 4 particles acted as nuclei during a sintering process. The length and mean aspect ratio of β-Si 3 N 4 seed grains...
Near zero thermal expansion porous ceramics were fabricated by using SiC and LiAlSiO 4 as positive and negative thermal expansion materials, respectively, bonded by glassy material. The microstructure, mechanical properties, and thermal expansion behavior of LAS/SiC porous ceramics with different particle sizes of LiAlSiO 4 were investigated. The results indicated that the coefficient...
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