Gfe Gesellschaft Fur Elektrometallurgie Mbh

Gfe Gesellschaft Fur Elektrometallurgie MIT Beschrankter Haftung

Durum Verschleissschutz Gmbh

Hans-Joachim Retelsdorf

Rudolf Fichte

Reinhard Hahn

Siegfried Sattelberger

Friedrich Breuer

Peter Knauf

Peter K Kunert

Dieter Born

Richard Jervis

Gunter Radel

A consumable nickel-tungsten-carbon electrode is used in arc welding deposition of a corrosion resistant layer producing a nickel-alloy matrix containing tungsten carbide inclusions on a surface of a metal workpiece by electric arc deposition under parameters such that there is either practically no solubilization of the tungsten carbide grains in the filling of the nickel tube of the electrode or there is substantially complete solubilization of the tungsten carbide grains and reprecipitation of the tungsten carbide inclusions in the matrix on cooling.

Method of applying wear-resistant layer and consumable electrode for

Process for the recovery of vanadium from vanadium-containing source materials under the addition of additives, especially alkali metal compounds, particularly the carbonates, chlorides, sulfates as well as nitrates and/or mixtures of these compounds, whereby the source material is ground and roasted. The roasted material is leached and whereby the withdrawn leach solution is hydrometallurgically treated for the recovery of vanadium compounds. The source materials are first roasted without the addition of alkali additives and subsequently are leached in a first leaching step. To the residues of the first leaching step are added alkali additives and the mixture is roasted in a second roasting step. The roasting products are again leached.

Method of recovering vanadium from vanadium-containing materials with at

Titanium-containing hydrogen storage alloys with a Laves phase composition AB.sub.2 are made in which the A component is titanium and possibly an element from the start of the transition metal groups of the Periodic Table. According to the invention a titanium-free prealloy is first formed and this prealloy is comminuted and smelted again with addition of titanium and possibly zirconium in a second vacuum furnace stage. The latter melt is then deoxidized with cerium mischmetal. Hydrogen storage capacities of about 2% by weight and above that conventionally obtained can be made.

Method of making a titanium-containing hydrogen storage alloy

A method of making cobalt-boron and/or nickel-boron alloys in a low-shaft electrical furnace wherein the burden or charge has a height of at least 500 mm and at least a portion of its carbon carrier consists of wood chips which are carbonized to wood charcoal during the process so that the wood charcoal which is produced can adsorb volatilized boron compounds and tap them so that they do not escape. The volatilized boron compounds thus tapped are carried to the reduction zone by the wood charcoal so that a high yield is obtained and the product has a low aluminum content.

Carbothermal method of producing cobalt-boron and/or nickel-boron

A method of making ferroboron or ferroborosilicon alloys in a low-shaft electrical furnace wherein the burden or charge has at least as a major portion of its carbon carrier, wood chips or particles which are carbonized to wood charcoal during the process and thus the charge has a porosity which permits adsorption action to prevent loss of volatile boron compounds. The charge also contains iron oxide and boron oxide, the electrodes of the furnace effecting a reduction of the boron oxide at a reduction zone just above the floor of the furnace.

Method of making ferroboron and ferroborosilicon alloys and the alloys

A workpiece of alloy steel is produced by sintering under a nonoxidizing atmosphere a mass of malleable-iron powder admixed with a comminuted complex ferroalloy. The latter, obtained from a molten mixture of several simple high-carbon ferroalloys saturated with graphite, is a blend of at least three nonferrous metals and iron in carbide form, including a complex carbide of formula M.sub.7 C.sub.3 containing iron and manganese with the possible addition of chromium and another carbide of formula M'.sub.2 C/M'C containing molybdenum with the possible addition of vanadium and/or niobium. The carbidically bound carbon amounts to at least 4%, by weight, of the ferroalloy composition and may constitute between 10% and 60% of the carbon of the sinterable powder mixture to which elemental carbon may be added as graphite. As the mass of iron and ferroalloy particles compacted under high pressure is sintered at temperatures between about 1150.degree. and 1300.degree. C., the carbides lose their identity as their metals diffuse into the soft iron along with the carbon.

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Zirndorf, Germany

Hans-Joachim Retelsdorf