High performance tungsten-copper composite material

Tungsten copper alloy has good dense as the electrode material requirements, wear corrosion resistance and good electrical conductivity. This paper discusses the technology route for preparing high-performance tungsten powder of fine particles of tungsten copper electrode, including particle size studies, preparation of high-performance tungsten  tungsten carbide inserts  infiltration process, add four parts impact on performance and other metallic elements. Metallurgical analysis by means of modern microscopy,  molybdenum electrode  microscopy analysis carried out a lot of experimental work and theoretical analysis, prepared by a high performance copper tungsten composites. First, the effects of three different tungsten powder particle size of the powder tungsten-copper alloy. Experimental results show that the finer the particle size, the density, the higher the hardness, but poor conductivity, tissue unevenness also increases.

Erosion Research arcing tungsten sheet contact materials

Arc erosion refers to the electric arc , the contact material to escape electronic , metal ions, metal vapor , droplets of molten metal from the electrode surface into the gap, resulting in loss of material . Arc erosion process is very complex , in the electric arc , electrical contact surfaces for physical and chemical changes . Erosion Research arcing contact materials is an important aspect of electrical arcing and contact theory and applied research . Materials production processes,  tungsten carbide plate  will result in different forms and morphologies arc erosion , anti- erosion ability arc prepared by powder metallurgy tungsten copper contact materials has been studied. In this paper, scanning electron microscopy and spectroscopy analyzer to observe the surface morphology of the fiber  Moly Crucible  arc erosion of tungsten copper contact materials , and studied its arc erosion rate , tungsten, copper contact material prepared in conjunction with powder metallurgy arc erosion compared. Materials and Methods tungsten fibers have a directivity alternative refractory metal powder of tungsten powder , a two-dimensional weaving method with the weft wire , tungsten wire is warp knitted and the copper-tungsten mesh ( wire as small when copper -induced infiltration ) and copper billets , two stacked together , placed into a vacuum sintering furnace for infiltration , you can get the fiber structure of tungsten copper contact materials .

Lower gas and impurities made ​​of tungsten sheet

Physical properties and electrical properties of tungsten-copper contact materials are used in a large number of high-voltage switchgear, load switch , automatic breaking and other high-voltage switchgear , switches and security , reliability , largely depends on the contact material . Fiber reinforced metal matrix composites having a good transverse mechanical properties, electrical conductivity, high thermal conductivity , having a higher corrosion resistance . This paper uses netting lamination , tungsten fiber weft , copper ( small) for the two-dimensional warp knitted mesh, the mesh and copper billets stacked together in a vacuum  sandblasted tungsten target  infiltration preparation of new tungsten copper contacts materials , and electrical properties were studied in vacuo . Low gas content and impurity content of the rule of law into the tungsten-copper composite electrode material tissue while avoiding the traditional process of mixing the powder caused by uneven uneven , making partial contact material does not appear in the course of ablation phenomenon . This paper studied the preparation of novel specific copper tungsten contact material , the fibrous  Tungsten copper alloy  liquid infiltration process . While using a small current through the circuit design their own experiments , direct and effective measure of the value of its closure and arc life, breakdown voltage , arc resistance and examine the strength of the new tungsten-copper contact materials by observing the morphology after arc erosion according to arcing and electrical contact theory, the erosion mechanism arc erosion morphology .

Good wear resistance and high temperature properties of tungsten sheet

In the use of diamond saw blades or drill to process high quartz content of the concrete pavement, concrete structures and high hardness , hard red granite sawing materials like high-density, high quartz content , often used to join a large number of tungsten metal powder , improved high-temperature strength and wear resistance of the carcass to improve product performance . Good wear resistance and high tungsten carbide plate of tungsten , but the high sintering temperature , generally in diamond segments carcass adding other low melting point metal powder such as copper , cobalt, nickel and other elements as the bonding phase , and add some low melting point metal tin elements to reduce the sintering temperature . In the diamond tool industry , the traditional method is the use of elemental powders obtained by mechanical mixing matrix material , due to the large proportion of tungsten , and other difficult process of mixing the powder mixing, likely to cause uneven carcass composition and organization , resulting in  Tungsten copper alloy  of the tool . In recent years, research on the application of pre- alloy powder ultrafine diamond tools carcass more and more , and achieved good results using the application or part of adding these pre- alloy powder were able to significantly improve the hardness and cutting the carcass performance . While research on the preparation of ultrafine tungsten-copper powder material , and made good sintering properties have been reported , such as tungsten, copper powder ultrafine high activity, low sintering temperature , high alloy densification , homogeneous and so on.

Molybdenum dis kto its excellent physical and chemical properties have been widely applied

Molybdenum due to its excellent physical and chemical properties are widely used, is the core of molybdenum alloy substrate supporting parts thyristor semiconductor modules , which plays to protect the chip to work, to extend the fatigue life of the thyristor and so on. But there are some applications of molybdenum problems , such as difficulty plating itself , molybdenum itself easily oxidized in air at 400 ℃, the surface oxide film is easily generated . However, molybdenum oxide  molybdenum wire  not play any protective effect, so molybdenum best for semiconductor devices coated with a protective film . This paper studies the field of molybdenum plating areas , focusing on the pre-treatment process of molybdenum , molybdenum , ruthenium plating and electroplating  molybdenum electrode  coating adhesion and uniformity improvements were studied . In this paper, pre-treatment process for molybdenum were studied . Pre-treatment process for molybdenum molybdenum subsequent coating quality has a crucial impact on the existing pre-treatment process , if applied to industrial production have many problems , so this paper by testing and analysis , development of a kinds of new pre-treatment process , not only to achieve the removal of oil , peel oxide and other results, while enhancing the substrate and subsequent coating machinery bite force for subsequent plating ruthenium laid a solid foundation , but also to achieve a safe, efficient target.