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Open Access Densification process of silica microspheres by multi-step sintering

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Dense silica microspheres were fabricated by spray drying and multi-step sintering. The effect of sinter temperatures on densification, dispersibility and inner morphology of silica spheres was analyzed by SEM, and the densification process was deeply discussed. The results showed that single-step sintering at 1100 °C made silica spheres seriously coherent each other and spherical morphology irregular. However, a multi-step process made the sinter temperature increase to 1190 °C, while silica spheres still kept uniformly spherical and dispersed. The increased temperature resulted in that the silica particles obtained dense inner morphology, and their density reached 2.18 g · cm–3, corresponding to a relative density of 98.6% (in comparison with the density of 2.21 g · cm–3 for noncrystal silica).

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Keywords: MULTI-STEP SINTERING; PARTICLE DENSITY; SILICA SPHERE; SPRAY DRYING

Document Type: Research Article

Publication date: August 1, 2019

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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