Créer mon blog M'identifier

China Cobalt Rod Is Used In Crucible Resistant Boilers

Le 24 février 2018, 07:15 dans Humeurs 0

Cobalt rod can be used in the resistance crucible boiler. In addition induction furnace (power frequency, IF) is also used. The structure of the alloy is much more complicated than the pure metal. Because the alloy consists of two or more elements, the interaction between the elements will form a variety of different phases. We in metals and alloys, where the same chemical composition, the same structure and with other parts of the interface by the uniform component, called the phase.

Powder Metallurgy Superalloy Prepared by Mechanical Alloying. The function of mechanical alloying (MA) is to fully homogenize the constituent elemental powder and the ultrafine oxide particles by a high-energy ball mill, and to process the metal powder into an alloy powder. MA principle is the deformation of metal powder under mechanical force, broken and repeated cold welding. In the process of MA, oxides and metal powders with higher hardness are continuously kneaded into the soft matrix metal, which is different from the ordinary mixing and is basically not limited by the particle size of the powder.

Has a high strength, good thermal fatigue resistance, hot corrosion and abrasion resistance, and has good weldability. Suitable for making aviation jet engines, industrial gas turbines, guide vanes and nozzle guide vanes for marine gas turbines, and diesel engine nozzles. First tungsten powder or molybdenum powder pressed into shape, and sintered to a certain porosity of tungsten, molybdenum skeleton, and then infiltration of copper. This method is suitable for low copper content of tungsten copper, molybdenum copper products. Compared with tungsten copper, molybdenum and copper has the advantages of small mass, easy processing, linear expansion coefficient, thermal conductivity and some main mechanical properties and tungsten copper equivalent.

Therefore, tungsten-copper alloy with low expansion of tungsten, wear resistance, corrosion resistance and have a high copper conductivity and thermal conductivity, and for a variety of machining. Tungsten copper alloy according to user requirements for the ratio of tungsten and copper production and size of the processing. Tungsten copper alloy powder metallurgy process is generally the first powder - mixing ingredients - pressing molding - sintering infiltration. Tungsten copper is the use of high-purity tungsten powder excellent metal properties and high purity copper powder plasticity, high conductivity, etc., by hydrostatic molding, high temperature sintering, the infiltration of copper refining process of composite materials. Arc-breaking performance, conductive thermal conductivity, thermal expansion, high temperature does not soften, high strength, high density, high hardness. Tungsten copper alloy is composed of tungsten and copper alloy is a metal matrix composite material.

Copper Tungsten alloy by the high conductivity

Le 24 février 2018, 05:32 dans Humeurs 0

Copper Tungsten alloy by the high conductivity of copper and refractory metal tungsten composition. Metallic tungsten and copper neither dissolve nor form an intermetallic compound, tungsten and copper can only form pseudoalloy. Tungsten copper with a tungsten skeleton (skeleton density is generally 70% to 86% theoretical density) of tungsten copper material, at high temperature, due to melting of copper, evaporation absorbs heat on the surface of the material, the cooling effect of the tungsten matrix, like the human body to reduce sweating Like body temperature, it is a kind of metal sweat material. Tungsten has a high melting point, high strength and high hardness, copper has good conductivity, thermal conductivity and toughness, tungsten and copper materials combine the performance of tungsten and copper, with high value.

Tungsten copper alloy has a wider range of uses, most of which are used in aerospace, aviation, electronics, power, metallurgy, machinery, sports equipment and other industries. Secondly, it should also be used to manufacture the contacts of the high-voltage electrical switches resistant to arc ablation and the rocket nozzle throat lining and tail rudder and other high-temperature components as well as the electrodes for electrical processing, high-temperature molds and other applications requiring electrical and thermal conductivity and high temperature occasion.

Cobalt-Chromium Alloy electronic packaging materials and heat sink material: Both the low expansion characteristics of tungsten, but also has high thermal conductivity of copper, is particularly valuable, the thermal expansion coefficient and thermal conductivity can be adjusted by adjusting the composition of the material and therefore The application of the material has brought great convenience.

The purity and content of tungsten powder is to ensure the good infiltration of tungsten powder, to achieve good copper infiltration effect of the premise. The oxygen content of tungsten powder increases, so that the wetting angle between tungsten and copper increased up to infiltration deterioration, when the oxygen content is greater than 0.5%, the specimen was heavily immersed copper sandwich, copper infiltration zone confined to the surface layer. High oxygen content of tungsten powder, copper powder is not necessary before use for hydrogen reduction treatment, the general oxygen content of tungsten powder can not be greater than 0.2%.

Cobalt-Chromium Alloy Main Components

Le 21 décembre 2017, 03:57 dans Humeurs 0

Cobalt-Chromium Alloy is based on cobalt as the main component, containing a considerable amount of nickel, chromium, tungsten and a small amount of molybdenum, niobium, tantalum, titanium, lanthanum and other alloying elements, and occasionally also contains a class of iron alloy. Depending on the composition of the alloy, they can be made into wire, powder for hard surfacing, thermal spraying, spray welding and other processes, can also be made into castings and forgings and powder metallurgy. Cobalt-Chromium Alloy castings for nuclear power, petrochemical, power, batteries, glass, light industry, food and many other fields. With wear-resistant, corrosion-resistant, anti-oxidation and high temperature characteristics. Commonly used products spool, seat, shaft, sleeve, pump parts, glass, battery molds, nozzles and cutting tools. Alloy categories are: Co-based alloy castings, Ni-based alloy castings, Fe-based alloy castings. Stellite powder metallurgy products using cobalt-based, nickel-based or iron-based alloy powder atomization, by pressing, sintering, finishing. The main products are stem, valve (ball), valve seat, valve ring, seal ring, wood serrated, bearing pump, bearing ball and so on.

Therefore, ceramic cutting tools are generally used for high speed small margin continuous cutting the most ideal, not suitable for processing intermittent surface. With the advancement of tool material technology, a new type of high-performance ceramic tool material came into being. Whisker toughening ceramic is a new variety of ceramic tool materials, through the addition of fibrous alloy structure, forming a network structure in the crystalline phase of the ceramic material, so that its bending strength and impact toughness increased significantly (close to the cemented carbide) , Its cutting performance is very suitable for processing alloy need too Stanley needs.

Has good corrosion resistance, heat resistance, wear resistance, at 650 ℃ or so can still maintain these properties. Mainly used for roller bit bearings, rotating blades of boilers, grinder cutting edge, screw feeder and other surfacing Surfacing Hardness HRC: 55-60HS113G Cobalt-based welding wire Main features and uses: Surfacing layer has excellent abrasion resistance Wear and heat, corrosion resistance, high temperature up to 800 ℃ can maintain these characteristics, the single impact toughness is poor, the temperature is more sensitive surfacing. Metallography is co-crystal and coarse composite carbides. Mainly used for pump sleeve and rotary seal ring, wear panel, bearing sleeve, hot roll, oil field drill surfacing Surfacing Hardness HRC: ≥ 54HS113Ni cobalt-based wire Main features and uses: The wire is properly reduced with Carbon content, adding more Ni and Fe and other alloying elements, thereby improving the toughness of the surfacing layer and the overall mechanical properties. Mainly used for cavitation erosion, corrosion resistance requirements of the internal combustion engine valves, exhaust valve surfacing. Contact us

Voir la suite ≫