摘要:
A method for the production of a gas diffusion electrode having particles of a platinum group metal deposited on a carbon sheet is disclosed. This method comprises placing a water-repelling carbon sheet into contact with ozone, thereby oxidizing the surface of the sheet and forming a functional group on the surface, then immersing the sheet in a solution containing platinum group metal complex cations as dissolved seeds, thereby inducing ion exchange between the hydrogen ions present in the functional group and the platinum group metal complex cations and deposition of the platinum group metal complex cations on the carbon sheet, and further reducing the platinum group metal complex cations on the carbon into platinum group metal particles.
摘要:
A low thermal expansion cordierite ceramic is produced by combining cordierite with a zirconium compound and a phosphorus compound and sintering the resultant mixture thereby giving rise to zircon therein.
摘要:
The present invention provides a process for producing fine flaky alumina particles suitable as a raw material for ceramics, a pigment for paint and etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350.degree. C. or above under a pressure of 200 kg/cm.sup.2 or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.
摘要翻译:本发明提供一种适合作为陶瓷原料的细片状氧化铝粒子的制造方法,涂料用颜料等,其中将具有亚微米级的粒径的氢氧化铝或水合氧化铝进行水热处理 在水或碱水溶液中,在350℃以上的温度下,在200kg / cm 2以下的压力下进行。 本发明还提供一种通过将上述细片状颗粒与有机保水材料和水捏合而制成的氧化铝基塑料。 优选使用甲基纤维素,聚乙烯醇,羧甲基纤维素,聚乙二醇等作为有机保水剂。 氧化铝基塑料具有高塑性,因此不需要使用大量的粘合剂。 因此,可以制备具有稳定性能的致密模制品。
摘要:
A ceramic isothermal forging die comprises a pair of disk-shaped die halves that are formed of ceramic and have die cavities cut in their mating surfaces and a pair of die half holders each having a recess for accommodating one of the die halves. Each die half is divided into a plurality of radial segments whose bottom surfaces are tapered away from their mating surface with increasing proximity to the center of the die. The floor of each die half holder is tapered to become deeper toward the center of the die and to be complementary to the tapered bottom surfaces of the die segments. The ceramic material of the die makes it usable in the atmosphere. Because of the segmentation of the die halves and the tapering of the segment bottoms and the floor of the die holder recesses, a large force which would otherwise be produced in the circumferential direction of the die by thermal stress during heating and cooling is suppressed. Further, a force urging the segments toward the center of the die is produced during forging. As a result, that die is protected from breakage and from disintegration by separation of the segments.
摘要:
A laser tracking interferometric length measuring instrument has a laser source and a tracking articulating optical lever provided on an optical path of an interferometric optical system. To track a retroreflector, the optical lever reflects a laser beam at the retroreflector, which reflects the beam back to the optical lever. This beam is reflected onto a quadrant photodiode. An attitude control means is used to control the attitude of the optical lever so that the laser beam reflected by the optical lever falls on the neutral point of the photodiode.
摘要:
The present invention provides a process for producing fine flaky alumina particles which are suitable as a raw material for ceramics, a pigment for paint, etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350.degree. C. or above and under a pressure of 200 kg/cm.sup.2 or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.
摘要翻译:本发明提供一种生产适合作为陶瓷原料的细片状氧化铝颗粒的方法,用于涂料的颜料等,其中具有调节到亚微米量级的粒度的氢氧化铝或氧化铝水合物经受 在350℃或更高的温度和200kg / cm 2或更低的压力下,在水或碱水溶液中进行水热处理。 本发明还提供一种通过将上述细片状颗粒与有机保水材料和水捏合而制成的氧化铝基塑料。 优选使用甲基纤维素,聚乙烯醇,羧甲基纤维素,聚乙二醇等作为有机保水剂。 氧化铝基塑料具有高塑性,因此不需要使用大量的粘合剂。 因此,可以制备具有稳定性能的致密模制品。
摘要:
A magnetoresistor with an ordered double perovskite structure is an oxide crystal which has an ordered double perovskite crystal structure represented by the general formula of A.sub.2 BB'O.sub.6, wherein A stands for Sr atoms, B for Fe atoms and B' for Mo or Re atoms and wherein the Fe atoms and the Mo or Re atoms are alternately arranged and which exhibits negative magnetoresistive characteristics.
摘要:
A manganese oxide material that can be used as a switching device or as a memory device or the like is formed of Mn-based oxide material. The Mn-based oxide material exhibits insulator-to-metal transitions induced by irradiating the material with laser light.
摘要:
A multi-legged walking apparatus includes a first plurality of legs having a large weight support capacity and a second plurality of legs providing a large thrust force. The first plurality of legs provide a smaller thrust force than the thrust force of the second plurality of legs, and the second plurality of legs have a smaller weight support capacity than the weight support capacity of the first plurality of legs. The overall weight of the apparatus is supported substantially by the first plurality of legs, and the overall thrust of the apparatus is provided substantially by the second plurality of legs.