检索结果-南通市图书馆

New Dental Alloys with Special Consumer Properties

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 273-278页

作者： TYKOCHINSKIY D. S. VASEKIN V. V. ojsc "SIC 'Supermetal'" Moscow Russia

The purpose of the investigation was to create a new gold alloy of yellow for casting the frames of metal ceramic dentures. The yellow color corresponds to the consumer and aesthetic needs of some patients, because it is a sign of the metal, which is noble and innocuous. The main alloying elements of the majority of gold alloys for metal-ceramics are platinum and palladium, which increase the strength characteristics. Copper, tin, and other precious metals and base metals are also introduced in these alloys. At the same time, it is necessary to ensure the correspondence of the properties of the alloy with those of the ceramics applied onto the metal frame. For this purpose, the thermal expansion coefficient of the alloy (TEC) should be in a range of 13.5~14.5 ×10 6 K 1 when heated from 20 to 600 ℃ . The two-component alloys, alloying of gold with platinum and palladium results in a decrease in the TEC, and the introduction of copper, silver, and tin, increases it. Multidirectional influence of the alloying elements is a factor in achieving compliance of the TEC with the given values of the alloy. In multicomponent systems, however, the mutual influence of individual components on the properties of the alloy is unpredictable. This also applies to the color characteristics of the alloys, which vary in the direction of reducing the yellowness with increasing concentration of platinum and palladium, while other elements may have the opposite effect on the results. Yellowness index (YI), calculated according to the results of spectrophotometric studies, has been chosen as an objective indicator of color. In this study, the requirement for YI was given not less than 25; the color of such alloys can be called light yellow. All the alloys investigated contained 85% (by weight) of gold. Therefore, higher corrosion resistance and biological inertness of a finished dental products were ensured. Among the alloys that met the yellowness/TEC requirements, two alloys have been sel

关键词： gold platinum palladium alloying elements alloy yellowness thermal expansion coefficient (TEC) metal-ceramics

Design and Range of Application of Slot Bushings with Volumetric Orifice Fields

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 124-126页

作者： ULYBYSHEV V. V. VASEKIN V. V. PERELMAN S. L. ojsc "SIC 'Supermetal'" Moscow Russia

A design of a slot bushing with a volumetric field has been developed, which allows to produce continuous fibers from melts with difficult processing characteristics in order to produce fibers with better operating characteristics. The operability of the design was confirmed when solving two problems of special technological complexity. 1. 400 and 800 orifice bushings for production of continuous fibers from the basalt melt have been developed and recommended for manufacture. 2. The process of production of continuous fibers from standard glass using 2400 orifice bushing with perforated plates instead of orifice tips without air cooling, has been realized for the first time.

关键词： slot bushing orifice under-orifice zone basalt melt temperature of the upper limit of crystallization viscosity limiting wetting angle perforated plate flow rate formation force governing air flow

Manufacture of Precious Metal Products： Advancement and Prospect

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 121-123页

作者： MOROZOVA L. E YASTREBOV V. A VASEKIN V. V. ojsc "SIC 'Supermetal'" Moscow Russia

A survey about ojsc "SIC Supermetal'" as a processor of secondary precious metal raw materials and a manufacturer of precious metal products for technical purposes,has been *** information has been given about the basic technologies and materials used in production,including dispersion strengthened materials on the basis of platinum alloys and laminar composites.

关键词： precious metals non-affinage processing dispersion-strengthened materials laminar composites solid-stamped orifice plates glass-melting apparatuses and bushings catalyst systems

International Organizing Committee of the Fifth International Conference KUNMING-PM'2012

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第S1期 9-10页

作者： Yu.A.Kotlyar General Director of ojsc RAO "Norilsk Nickel"

Ladies and Gentlemen, On behalf of ojsc RAO "Norilsk Nickel" I heartily congratulate all the scientists, engineers, and specialists on the opening the Fifth International Conference "Platinum Metals in Modern Industry, Hydrogen Energy and Life Maintenance in the Future" (KUNMING-PM’ 2012). Holding of the fifth conference in China is the recognition of evident achievements of thriving Chinese economy, especially in the sectors of industrial consumption of precious metals.

关键词： раз International Organizing Committee of the Fifth International Conference KUNMING-PM’2012 PM

Experience in the Production of Horizontal Ingots of Platinum Metals and Alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 250-252页

作者： LEVCHENKO S. D. VERSHININA E. N. ojsc "SIC 'Supermetal'" Moscow Russia.

The quality of semi-products of platinum metals and alloys, produced by way of plastic working, essentially depends on or, in many cases, is completely determined by the quality of ingots. Plastic working does not make it possible to eliminate or localize metallurgical defects. In many cases it promotes the occurence thereof. Low-rate casting with directional crystallization can ensure the production of dense ingots free of non-metallic inclusions, shrinkage and gas weakness, with observance of certain temperature/rate modes. After comparative tests of vertical and horizontal molds, preference has been given to horizontal water-cooled molds, allowing to cast all alloys in the conditions of directional crystallization.

关键词： ingot directional crystallization low-rate casting mold crystallization front metallurgical defect sticking pyrometallurgical refining

Hydrogen Civilization Doctrine: Whether the Humankind Can Prevent Global Ecological Catastrophe?

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 195-197页

作者： GOLTSOV V.A. GOLTSOVA L.F. SPORTSMEN L.A. GOLTSOVA M.V. Donetsk National Technical University DonetskUkraine ojsc "SIC 'Supermetal' " MoscowRussia

Hydrogen Civilization (HyCi) doctrine is a novel world outlook, all-embracing vision of the sustainability of the human future: humanity can preclude world climate catastrophe and conserve the biosphere's ability to maintain the life of humanity by the only way, just by the sustainable movement along the vector "Hydrogen Energy → Hydrogen Economy → Hydrogen Civilization". HyCi doctrine is overcoming boundaries between different sciences, between peoples and nations. Hydrogen civilization is a public ideal ('superattractor') putting in the forefront Shakespeare's Hamlet question on a global scale: "To be or not to be the humankind: that is the question".

关键词： hydrogen energy hydrogen economy hydrogen civilization sustainability

Fundamental Laws of Structure and Form Changing of Palladium Loading with Hydrogen

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 198-200页

作者： GOLTSOVA M.V. SPORTSMEN L.A. ZHIROV G.I. Donetsk National Technical University DonetskUkraine ojsc "SIC 'Supermetal'" MoscowRussia

There are reviewed some experimental results on metal-hydrogen and PdH x -hydrogen interaction. There is experimentally shown that penetration of hydrogen in palladium is accompanied with strong and micro structural effects, as well as grain shifts, etc. Moreover, the hydrogen saturation of palladium causes form-changing (bending) of palladium plate. These effects, undoubtedly, must be taken in account in technologies of low-temperature diffusion membrane apparatus exploitation.

关键词： membrane alloys alloys of palladium with hydrogen reversible and unreversible bendings form-changings

Manufacture of Catalyst Systems for Ammonia Conversion

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 71-75页

作者： GAKH S. V. SAVENKOV D. A. DJSC "sic 'Supermetal'" Moscow Russia ojsc "Mineral and Chemical Company 'EuroChem'" Moscow Russia.

Platinum catalyst gauzes have been in use since the moment of development of the process of catalyst oxidation of ammonia for production of nitric acid or hydrocyanic *** gauzes are usually made of platinum or its alloys with rhodium and *** precious metals have remarkable properties that make them ideal catalysts for acceleration of the ammonia/oxygen *** 2008,ojsc "SIC 'Supermetal'" and Umicore AG&*** launched a production line for Pt-alloy-based catalyst systems to be used for ammonia oxidation in the production of weak nitric *** systems consist of a pack of catalyst gauzes and a pack of catchment gauzes,which are made using flat-bed knitting machines and wire-cloth ***,up-to-date catalyst systems MKSprecise TM are being manufactured,the basic advantages of which are an individual structure of gauzes and composition of the material,which allows to define precisely the position of each gauze in the catalyst pack,a high activity of the catalyst pack,direct catching of platinum and rhodium in the catalyst system,and a reasonable combination of single-and multilayer types of *** makes it possible to vary the configuration of the catalyst and select an optimum composition of the system to ensure the maximum efficiency of the ammonia oxidation *** also produce the catchment systems that allow to find the best decision from the economic point view for each individual case.

关键词： MKSprecise TM catalyst systems high selectivity of the process modern technology of catching reduction of irrevocable losses of precious metals increase in the degree of conversion significant reduction of ammonia consumption

Production of Nanopowders of Platinum Metals Using the Chemical Reduction Method

在线全文

学校读者我要写书评

暂无评论

贵金属 2012年第A1期33卷 267-268页

作者： PYATAKHINA E. S. BUSLAYEVA T. M. VOLCHKOVA E. V. KHRISTICH E. A. ERGEYEVA T. Yu. ojsc "SIC 'Supermetal'" Moscow Russia Lomonosov Moscow University of Fine Chemical Technology Moscow Russia.

The literary data on the application of various methods for the production of nanopowders of platinum metals and alloys have been summarized, and the selection of the method of chemical reduction from salt solutions has been substantiated as the simplest and most affordable. The optimum conditions for the production of nanoparticles of metal palladium and platinum/cobalt alloy, using the effect of boranes with various structures, have been selected.

关键词： platinum metals powders double complex salts reduction boranes