Abstract:
A proton conducting ceramic membrane comprising a conducting layer, wherein said conducting layer comprises a mixture of a rare-earth tungstate as herein defined and a mixed metal oxide as herein defined. The invention also relates to a reactor comprising said membrane and the use of said membrane in a dehydrogenation process.
Abstract:
A ceramic and a preparation method therefor are provided. The ceramic includes a zirconia matrix, and an additive dispersed inside and on an outer surface of the zirconia matrix. The additive is an oxide including elements A and B, where A is selected from at least one of Ca, Sr, Ba, Y, and La, and B is selected from at least one of Cr, Mn, Fe, Co, and Ni.
Abstract:
Provided is a zirconia sintered body that suppresses discoloration due to porcelain. The zirconia sintered body comprises at least one of a coloring agent A: erbium oxide and a coloring agent B: nickel oxide, and a composite oxide of zirconium and vanadium.
Abstract:
Provided is a zirconia sintered body that suppresses discoloration due to porcelain. The zirconia sintered body comprises at least one of a coloring agent A: erbium oxide and a coloring agent B: nickel oxide, and a composite oxide of zirconium and vanadium.
Abstract:
The invention relates to a method for manufacturing sintered refractory grains containing Cr 2 CO 3 from an initial refractory product including one or more chromium oxides, all the dimensions of the starting refractory material being no lower than 1 mm, said method including the following steps, in the following order: A) optionally, a step of crushing the starting refractory material; B) grinding a filler to be ground, comprising said starting refractory material that was optionally crushed, in a liquid medium in order to obtain a suspension of particles of said starting refractory material, more than 80% of said particles, by weight percentage, having a size of less than 50 μm; C) preparing a starting mixture including at least 1 wt % of particles of the suspension obtained during the preceding step; D) shaping the starting mixture into the shape of a preform; E) optionally drying the preform obtained in step D); F) sintering the preform so as to obtain a sintered body; G) optionally grinding the sintered body; H) the optional selection by particle size, steps D), G) and H) being adapted such that the sintered body, optionally crushed and/or selected, is in the form of a grain or a granular powder.
Abstract:
The thermistor unit of a thermistor device is constituted of a mixture sintered body (MM')O3 . AOx of a composite perovskite oxide represented by (MM')O3 and a metal oxide represented by AOx. M in (MM')O3 is at least one element selected from elements in group 2A and those (except for La) in group 3A in the periodic table, and M' at least one element selected from elements in groups 3B, 4A, 5A, 6A, 7A and 8 in the periodic table, and metal oxide AOx uses a high-resistance, heat-resisting metal oxide having a melting point of at least 1300 °C and a resistance (1000 °C) of AOx simple substance in a thermistor device shape of at least 1000Φ, thereby providing a resistance ranging from 100Φ to 100k Φ in a temperature range of room temperature to 1000 °C with small temperature variations.
Abstract:
A filler for a ladle tap hole valve, characterized by comprising a sand and a feldspar to be externally added and mixed together so that the total quantity of alkalis in the filler is 0.3 to 1.5 mass %, the feldspar having a particle size distribution of 0.3 to 1.7 mm, the sand being composed of 40 to 100 mass % of silica sand having a particle size distribution of 0.3 to 1.7 mm and 60 to 0 mass % of chromite sand having a particle size distribution of 0.1 to 0.85 mm.
Abstract:
Verfahren zur Herstellung keramischer Teile mit bestimmter Porosität durch Sinterung mittels Mikrowellen, wobei in einem Gefäß zu sinternde Werkstoffe angeordnet sind, dadurch gekennzeichnet dass
die Mikrowellen Energie zur Sinterung über elektromagnetische Wellen im Bereich der Vakuumwellenlänge von 5 cm - 20 cm im Multimode mit einer elektromagnetischen Leistung bis zu einem Kilowatt in zu sinternde Werkstoffe einbringen und das Gefäß neben Primärmaterialien zum Aufbau des Gefäßes aus einem Sekundärmaterial aufgebaut ist, das aus einer Mischung von nichtmetallischen para-, ferromagnetischen-, antiferromagnetischen bzw. ferroelektrischen Materialien mit hochschmelzenden mikrowellentransparenten Materialien besteht.