Author
P. Y. Dalvi
Bio: P. Y. Dalvi is an academic researcher. The author has contributed to research in topics: Cubic zirconia & Sintering. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.
Topics: Cubic zirconia, Sintering, Phase (matter), Microstructure
Papers
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TL;DR: In this article, it is observed that additions up to 5 wt % of various decomposable and non-decomposable stabilizers like CaCO3 MgCO3, Y2O3 and CaF2 result in formation of cubic zirconia phase from 15 to 90% between 1000° and 1200°C.
Abstract: Usefulness of pure zirconia as a refractory material becomes limited due to phase transformation which results in volume changes. These phase transfromations can be suppressed by various stabilizers.It is observed that additions up to 5 wt % of various decomposable and non-decomposable stabilizers like CaCO3 MgCO3, Y2O3 and CaF2 result in formation of cubic zirconia phase from 15 to 90% between 1000° and 1200°C. However, the formation of cubic phase more than 35%, seems to be affecting the sinterability. Properties like densification, microstructure, cubic phase formed have been studied with these stabilizers.Data obtained reveals that nature of stabilizers and amount of cubic phase formed are factors influencing the densification and microstructure of resultant partially stabilized zirconia.
5 citations
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TL;DR: In this paper, the effect of starting powder characteristics (purity, grain size and shape, size distribution, sintering aids content, etc.), green compact microstructure (density and porosity distribution), and processing parameters (including temperature, exposure time, rate of heating or cooling of the medium) on sintered ultrafine ZrO2-based powders were considered.
Abstract: We consider the effect of the starting powder characteristics (purity, grain size and shape, size distribution, sintering aids content, etc.), green compact microstructure (density and porosity distribution), and processing parameters (including temperature, exposure time, rate of heating or cooling of the medium) on sintering of ultrafine ZrO2-based powders. We discuss various sintering techniques: hydrothermal sintering, microwave sintering, hot pressing, sinter—forging, sinter-HIP, and gas-pressure sintering.
19 citations
TL;DR: In this paper, the behavior of two commercial yttriastabilized zirconias during sintering was investigated and it was found to be advantageous to use as the initial powder a material characterized by a monodisperse distribution of small particle sizes in order to lower the temperature of total densification.
9 citations
TL;DR: Synthese de poudres de zircone stabilisee par CaO, caracterisation par analyse thermique differentielle, frittage as discussed by the authors.
Abstract: Synthese de poudres de zircone stabilisee par CaO, caracterisation par analyse thermique differentielle, frittage
8 citations
TL;DR: The results show that mixtures containing up to 2 wt% of calcia (uncalcined or calcined up to 1000°C) developed up to 40% cubic phase, and exhibited better mechanical strength as well as better thermal fatigue resistance as discussed by the authors.
Abstract: During sintering studies on zirconia with calcia in the range of 0.50 to 5.0 wt%, properties like crushing strength and thermal shock resistance were measured. Samples containing 15 to 90% cubic zirconia phase were subjected to crushing strength test at room temperature as well as high temperature up to 1200°C and thermal fatigue test from 1400°C to room temperature.The results show that mixtures containing up to 2 wt% of calcia (uncalcined or calcined up to 1000°C) developed up to 40% of cubic phase, and exhibited better mechanical strength as well as better thermal fatigue resistance.