Sintering Of Magnesium Oxide Research Articles

The influence of point defects on the sintering of magnesium oxide

The influence of point defects on the sintering of magnesium oxide

Stability and sintering of MgO as a substrate material for Lanthanum Tungstate membranes

The performance of ceramic gas separation membranes can be increased by reducing their thickness. To maintain the mechanical stability of the membrane, a supporting structure is needed. In this work magnesium oxide (MgO) is identified as support material for H2-separation membranes made of La6-xWO12-δ (LaWO). Therefore MgO is tested under application-related conditions in a water-gas-shift (WGS) catalytic membrane reactor for hydrogen production and shows a good stability. The sequential tape casting serves as the manufacturing method for the preparation of the asymmetric membrane structures. To show the compatibility of the two materials, detailed investigations of the sintering behaviour and stability tests are performed and show the well-matching properties of the two materials. Microstructural analyses reveal the inter-diffusion between LaWO and MgO.

Processing of Dense MgO Substrates for High-Temperature Superconductors

Abstract Sintering of magnesium oxide ceramics to high density requires high temperatures (1500–1800°C), resulting in coarse-grained microstructures, or additives that promote sintering. An alternative is to use a fine-grained MgO starting powder with an impurity level < 1% that allows appropriate processing conditions. Here, we report about processing by slip casting, resulting in ceramic green bodies that can be sintered to closed porosity at 1600°C. X-ray diffraction and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy showed that the sintered bodies are single-phase. The process described here is suitable to sinter large substrates up to 200 mm × 200 mm and 96% of the theoretical density with closed porosity. The MgO substrates are suitable for partial melt processing of high-quality Bi-2212 thick films.

Sintering of magnesium oxide obtained from sea water

Abstract The process of isothermal sintering of magnesium oxide obtained from sea water (by precipitation with 80% and 120% of the stoichiometric quantity of the precipitation agent respectively) and of reagent grade magnesium oxide was examined with addition of 0·5% TiO2, at a temperature of 1600°C, for different durations of isothermal sintering and for different pressures applied in the forming of compacts. Product density, shrinkage and porosity were examined, and the results obtained were analysed mathematically. The effect of the TiO2 in the magnesium oxide sample on the content of B2O3 was also determined. Coefficients have been calculated for associated reactions, namely those for the formation of Ca2B2O5 and CaTiO3.

Effect of liquid phase on sintering of magnesium oxide with zirconium diphosphate addition.

On cherche a clarifier le role de la phase liquide dans le frittage de MgO avec addition de ZrP 2 O 7 dans la zone de temperature 1300°C-1450°C

Effect of Silicon Diphosphate Addition on Sintering of Magnesium Oxide

Effect of Silicon Diphosphate Addition on Sintering of Magnesium Oxide

Effect of Calcium Diphosphate Addition on Sintering of Magnesium Oxide

Effect of Calcium Diphosphate Addition on Sintering of Magnesium Oxide

Sintering of Magnesium Oxide in Presence of Liquid Phase

An intimate mixture of tri-component eutectic with 23.0% CaO, 15.0% Al2O3 and 62.0% SiO2 was prepared at 1400°C for 2 hours. Effects of eutectic mixture (3 and 5 wt%) on the sintering of magnesia was studied at varions temperatures (1250°–1450°C) and times (up to 100 minutes). More than 97.0% of theoretical density was achieved by magnesia compacts containing 5% eutectic mixture at 1450°C. Microstructures of magnesium oxide with additive showed rounded periclase crystals.

Effect of Magnesium Diphosphate and Zirconium Diphosphate Additions on Sintering of Magnesium Oxide

Effect of Magnesium Diphosphate and Zirconium Diphosphate Additions on Sintering of Magnesium Oxide

The influence of mangan ion valency state on formation of microstructural constituents during sintering of magnesium oxide

The influence of mangan ion valency state on formation of microstructural constituents during sintering of magnesium oxide

Sintering magnesia with boron additives

We studied the sintering of magnesium oxide with different additions of datolite and boric anhydride. As regards improving the sintering of magnesium oxide the greatest effect is noted with 0.5% datotite and 3% B2O3. The activation energy for sintering with increase in the quantity of B2O3 diminishes from 90 to 50 kcal/mole, with an addition of datolite it varies from 82 to 114 kcal/mole.

Sintering of Oxide and Carbide‐Metal Compositions in Presence of a Liquid Phase

Observations of microstructure changes in several systems and the rate of densification during sintering of magnesium oxide, titanium carbide, and tungsten carbide in the presence of a liquid phase indicate that the densification rate is controlled by diffusion through a liquid film between particles. Dependence of the sintering rate on time, particle size, and temperature are in agreement with predictions. Theoretical estimations of the sintering rate are in reasonable agreement with experimental measurements.