Journal ArticleDOI
Initial Sintering of MnXO-Al2O3
J. R. Keski,Ivan B. Cutler +1 more
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TLDR
In this article, the effects of manganese oxide on the initial sintering kinetics of compacts of 5-μ diameter alumina were studied by isothermal shrinkage measurements from 1450° to 1650°C.Abstract:
Effects of manganese oxide on the initial sintering kinetics of compacts of 5-μ diameter alumina were studied by isothermal shrinkage measurements from 1450° to 1650°C. The observed rates were characterized by assuming a volume-diffusion mechanism. Variations in sintering rate with both oxygen partial pressure in the furnace and impurity concentration, as well as the observed activation energy, indicated oxygen-ion diffusion was the rate-limiting step during densification.read more
Citations
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Mass Transport in the Diffusional Creep of Ionic Solids
TL;DR: In this paper, a mass transport equation which takes into account parallel diffusion paths for anions and cations was derived and applied to the diffusional creep of polycrystalline ionic solids.
Journal ArticleDOI
Influence of MnO and TiO2 additives on density, microstructure and mechanical properties of Al2O3
M. Sathiyakumar,F.D. Gnanam +1 more
TL;DR: In this article, the effect of manganese oxide and titanium oxide as additives on sintering of alumina is described, along with the mechanical properties, including sintered density, average grain size and microstructural features.
Journal ArticleDOI
The effect of TiO2 and MnO2 on densification and microstructural development of alumina
TL;DR: In this article, the effect of MnO 2 and TiO 2 as additives during the densification and microstructural development of Al 2 O 3 has been investigated between the temperature range of 1250 and 1550 °C.
Journal ArticleDOI
Effect of Iron Oxide on the Sintering Kinetics of Al2O3
W. Raja Rao,Ivan B. Cutler +1 more
TL;DR: In this paper, a defect model for corundum is proposed to explain the sintering data for transition-metal-ion-doped Al2O3, and the contribution of surface diffusion during initial-stage Sintering is estimated by combining shrinkage and neck-growth data.
Journal ArticleDOI
Effect of Doping Simultaneously with Iron and Titanium on the Diffusional Creep of Polycrystalline A12O3
Yasuro Ikuma,Ronald S. Gordon +1 more
TL;DR: In this article, the effect of doping simultaneously with iron and titanium was studied in dense polycrystalline alumina over a range of grain sizes (10 to 100 μm) and temperatures (1250° to 1550°C).
References
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Journal ArticleDOI
Study of the Initial Stages of Sintering Solids by Viscous Flow, Evaporation‐Condensation, and Self‐Diffusion
W. D. Kingery,M. Berg +1 more
TL;DR: In this article, a model is presented for the behavior of copper during the initial stages of sintering, which is in agreement with available experimental data, and which requires vacancy elimination at dislocations or grain boundaries.
Journal ArticleDOI
Self-diffusion of oxygen in single crystal and polycrystalline aluminum oxide
Y. Oishi,W. D. Kingery +1 more
TL;DR: The self-diffusion coefficient of oxygen has been determined as a function of temperature in single crystal and polycrystalline aluminum oxide at temperatures up to 1780°C as mentioned in this paper.
Journal ArticleDOI
Aluminum Ion Diffusion in Aluminum Oxide
A. E. Paladino,W. D. Kingery +1 more
TL;DR: In this article, the self-diffusion coefficient of aluminum in polycrystalline aluminum oxide over the range 1670° to 1905°C was determined, and diffusion couples were employed using aluminum•26 in oxide form as a radioactive tracer.
Journal ArticleDOI
Self-diffusion in sintering of metallic particles
TL;DR: In this paper, the authors studied the mechanisms involved in sintering, a phenomenon of two or more particles with the application of heat only and at temperatures below melting point of any component of the system, although the powder metallurgists use this term in a broader sense, including the presence of molten phase and pressure.