Recrystallization of Amorphized α-TCP

Nicola Döbelin; Laëtitia Galea; Urs Eggenberger; José Maria da Fonte Ferreira; Marc Bohner

doi:10.4028/www.scientific.net/KEM.493-494.219

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 493-494Recrystallization of Amorphized α-TCP

Recrystallization of Amorphized α-TCP

Abstract:

Phase-pure α-TCP powder was milled using a high-energy planetary mill to obtain a partially X-ray amorphous material. Calcination at temperatures between 350 and 600 °C was employed to recrystallize the powder. The phase composition as a function of calcination time and temperature was determined in-situ using high-temperature XRD equipment. It was found that the amorphous fraction recrystallized mainly to α-TCP, with only small amounts of β-TCP formed. At low temperatures (≤ 450 °C), a stable composition with approximately 85 wt-% α-TCP was found once 100% crystallinity was reached. The time required to reach full crystallinity depended on the calcination temperature. For temperatures > 450 °C a slow transformation to β-TCP was observed. The transformation rate depended on the calcination temperature and on the milling intensity. A moderately milled powder recrystallized to α-TCP, followed by a slow transformation to β-TCP at 600 °C, whereas an intensely milled powder also recrystallized to α-TCP, followed by a fast transformation to β-TCP at the same temperature.

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Key Engineering Materials (Volumes 493-494)

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219-224

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.493-494.219

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Online since:

October 2011

Authors:

Nicola Döbelin, Laëtitia Galea, Urs Eggenberger, José Maria da Fonte Ferreira, Marc Bohner

Keywords:

Amorphous TCP, Phase Transformation, Recrystallization, α-TCP, β-TCP

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