Effect of Small Amounts of Porosity on Grain Growth in Hot-Pressed Magnesium Oxide and Magnesiowustite

Autor:	G. W. Hollenberg, Ronald S. Gordon, D. D. Marchant
Rok vydání:	1970
Předmět:	Grain growth Materials science Dopant chemistry Magnesium Kinetics Metallurgy Materials Chemistry Ceramics and Composites chemistry.chemical_element Grain boundary Limiting Porosity
Zdroj:	Journal of the American Ceramic Society. 53:399-406
ISSN:	1551-2916 0002-7820
Popis:	Grain growth was studied at 1300°, 1400°, and 1500°C in nearly theoretically dense (0.1 to 0.8% porosity) hot-pressed magnesium oxide (99.99+%) and magnesiowustite (0.10 and 0.48 wt% Fe2O3). Small amounts of porosity had large effects on the kinetics of grain growth. Grain growth is probably porosity-controlled in MgO at all temperatures and in magnesiowustite at 1400° and 1500°C if pores remain on grain boundaries or at grain intersections. The tendency for the entrapment of porosity is enhanced as the temperature is increased and as the dopant (Fe2O8) concentration is decreased. Small amounts of porosity (
Databáze:	OpenAIRE
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