MICROSTRUCTURE AND GRAIN SIZE DISTRIBUTIONS IN MAGNESIA-ALUMINA SPINEL CERAMICS PREPARED BY SPARK PLASMA SINTERING

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43915091" target="_blank" >RIV/60461373:22310/18:43915091 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

MICROSTRUCTURE AND GRAIN SIZE DISTRIBUTIONS IN MAGNESIA-ALUMINA SPINEL CERAMICS PREPARED BY SPARK PLASMA SINTERING

Original language description

Magnesia-alumina spinel (MAS) is one of the favorite materials for preparing transparent ceramics for impact-resistant optical windows. Therefore both optical and mechanical properties are important for these ceramics. Apart from highest density and the absence of pores, which can both be achieved by spark plasma sintering (SPS), the grain size is the main parameter that can be optimized. On the other hand, from the theoretical point of view, MAS prepared by SPS is an ideal system to study grain growth unconstrained by pores or second-phase inclusions. This contribution presents a systematic approach for the microstructural characterization of MAS ceramics prepared by SPS. Based on SEM images, obtained from thermally etched planar sections, the mean chord length and Jeffries size and related microstructural descriptors (grain boundary density, mean curvature integral density, linear and planar grain size numbers) are calculated, and grain size distributions are obtained from grain section size distributions, using the Saltykov, Cruz-Orive and Woodhead transformations for the tentative correction of the random section problem. It is found that all grain size distributions are very close to Rayleigh distributions and that the “average” grain size increases to 0.8–1.2 μm when the SPS process is performed at 1500 °C with 30 min dwell, compared to 0.6–0.8 μm for samples prepared by SPS at lower temperature (1400 °C) or with shorter dwell time (0 min). Concomitantly with the grain growth the number density decreases, from approximately 1.4–2.8 μm–3 to 0.6–0.8 μm–3.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/GA15-18513S" target="_blank" >GA15-18513S: Processing and characterization of oxide and silicate ceramics with controlled microstructure and modeling of microstructure-property relations</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the 12th Pacific Rim Conference on Ceramic and Glass Technology

ISBN

978-1-119-49421-8

ISSN

1042-1122

e-ISSN

neuvedeno

Number of pages

12

Pages from-to

41-52

Publisher name

American Ceramic Society (ACerS)

Place of publication

Westerville, Ohio

Event location

Waikoloa

Event date

May 21, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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