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Journal ArticleDOI

Titania powder activation and rutile ceramics structure formation

01 Jan 2009-Science of Sintering (National Library of Serbia)-Vol. 41, Iss: 1, pp 27-33
TL;DR: The impact of mechanochemical activation (MCA) in aqueous medium with various organic additives on commercial titania powder and products made of it has been investigated by X-ray diffraction, optical microscopy and Raman spectroscopy as mentioned in this paper.
Abstract: Impact of mechanochemical activation (MCA) in aqueous medium with various organic additives on commercial titania powder and products made of it has been investigated by X-ray diffraction, optical microscopy and Raman spectroscopy. Agar-agar additive has been shown to offer promise for activation of titania powders used in obtaining both dense and porous materials.
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TL;DR: In this paper, a mechano-chemical reaction between powder quartz and TiO2 composite particles (PQ/TCP), a type of core (powder quartz) and shell (TiO2) composite powder, was investigated.
Abstract: Titanium dioxide pigment is a white pigment of high performance. However, its production could cause severe environmental and resource problems. In this paper, powder quartz/TiO2 composite particles (PQ/TCP), a type of core (powder quartz)–shell(TiO2) composite powder, were prepared by a mechano-chemical method. The pigment properties of PQ/TCP and the mechanism of the mechano-chemical reaction between quartz and TiO2 were investigated. Orthogonal analyses of experimental vairables showed optimal pigment characteristics of PQ/TCP under the following conditions: 4 h of activation for powder quartz, mixing/grinding at 1000 rpm for 1 h, with a mixing slurry made of 50% powder quartz and 0.4% dispersant. Powder quartz was evenly coated by TiO2 and the Si–O–Ti bond was formed between powder quartz and TiO2 in PQ/TCP as revealed by FTIR analyses and confirmed by surface thermodynamic calculation.

3 citations

Journal ArticleDOI
TL;DR: The effect of adding copper oxide in an amount of 0.9 wt.% on sintering capacity, microstructure, and phase composition of material based on zirconium dioxide stabilized with yttrium oxide is studied in this paper.
Abstract: The effect of adding copper oxide in an amount of 0.9 wt.% on sintering capacity, microstructure, and phase composition of material based on zirconium dioxide stabilized with yttrium oxide is studied. Powder is prepared by reverse precipitation with ammonia from aqueous solutions. It is shown that in the presence of copper oxide there is formation of monoclinic zirconium dioxide, appearance of a liquid phase in the range 1120 – 1200°C, and a change in material color and porosity.

1 citations

References
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TL;DR: In this article, the extrusion of aqueous suspensions that contain a small amount (< 1 wt.-%) of a gelling additive that gelates on passing through a refrigerated die is described.
Abstract: In recent years a variety of direct shaping methods has been developed for the near-net shaping of ceramic powders. The main aim in developing these methods is to provide a simple route for manufacturing bulk complex-shaped bodies with increased green resistance in order to reduce or avoid final machining, which is the most expensive step in the fabrication process. This communication reports a novel processing route for the continuous manufacture of ceramic and/or metal hollow or solid bodies based on the extrusion of aqueous suspensions that contain a small amount (< 1 wt.-%) of a gelling additive that gelates on passing through a refrigerated die.

12 citations