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There are four types of resistance welding, which can use tungsten copper bonded copper electrode as welding tip, spot welding, seam welding, butt welding and projection welding. Spot welding assembles the weldment into a lap joint and presses it between two cylindrical electrodes to melt the base metal using resistance heat to form a solder joint, which is mainly used for thin plate welding. The processes are preloading to ensure good contact of the workpiece, energizing to form nugget and…

Tungsten copper is a material with high electricity conductivity, when using for resistance welding, the material is bonded with copper hand. This kind of welding method refers to a method in which electric current passes through the welding objective and the resistance heat generated at the contact point as a heat source to locally heat the objective while pressing for welding. There are many advantages for this kind of welding method, high productivity, low deformation and easy automation realization. The…

Compared with commercial graphite anode materials for lithium-ion batteries, nano-transition metal oxide anodes have better lithium storage properties and higher theoretical specific capacity, which are more in line with future social development requirements. As far as the transition metal tungsten trioxide is concerned, it is not only eco-friendly, but also low in price and high in theoretical specific capacity. It is undoubtedly a negative electrode material with great development potential. However, bulk tungsten trioxide has low conductivity and large volume…

Network data shows that tungsten trioxide with a particle size in the range of 100nm-1000nm is called submicron yellow tungsten oxide. According to the quantum size effect, although the specific surface area of submicron yellow tungsten oxide is smaller than that of nano tungsten oxide, it still has the advantages of excellent gas sensitivity and not easy to agglomerate. Gas sensitivity can be simply understood as the appearance characteristics of chemical materials, such as color, which easily changes significantly with…

It is reported that the team of Professor Yonghui Deng of Fudan University used the cooperative co-assembly between organic block copolymers and inorganic heteropolyacid molecules to directly synthesize three-dimensional, equally spaced, orthogonally arranged Si-doped ε-WO3 orthogonal nanowire arrays for the first time. And the material has excellent sensor response performance to acetone (acetone is one of the physiological and pathological landmark volatiles in human exhaled breath), which is mainly because the metastable ε-WO3 nanowire array structure has 3D stacking porous…

It is reported that the researchers combined the advantages of graphene’s unique two-dimensional layered structure, excellent electrochemical performance and the wide application characteristics of WO3 nanowires in various dingal fields, and assembled WO3 nanowires as guest materials into the graphene host material. , Control the synthesis conditions to prepare a unique one-dimensional and two-dimensional nanocomposite material, which has great potential application prospects in the fields of chemistry, optics and electricity. The graphene loaded WO3 nanowire composite material is characterized in…

Tungsten diselenide has the chemical formula WSe2, and its thermal conductivity is about one-100,000th of that of diamond with the best thermal conductivity. It can be said that it is the lowest thermal conductivity material among all materials discovered by scientists. So, how should tungsten diselenide nanoflowers be prepared? Preparation of tungsten diselenide nanoflowers, the specific steps are as follows: (1) Dissolve selenite (H2SeO3) in an organic solvent and mix uniformly, add sodium tungstate (Na2WO4) with crystal water while stirring.…

Industrially, the raw material mineral wolframite is extracted with sodium hydroxide aqueous solution to make crude sodium tungstate, and then the crude product is made into WO3?2H2O with acid, sodium hydroxide is used to make Na2WO4?2H2O. It should be noted that WO3?2H2O is difficult to completely convert into Na2WO4?2H2O. How to determine the content of tungsten trioxide in sodium tungstate? The content of tungsten trioxide in sodium tungstate is generally determined by the cinchonine gravimetric method. Below, let’s take a…

As we all know, there are many factors that affect tungsten powder property, but the main factors are nothing more than the production process of the tungsten powder, the properties and characteristics of the raw materials used. At present, many researches are on the reduction process, including reduction temperature, boat pushing speed, loading capacity and method, reduction atmosphere, etc. During the production and research process, researchers have found that the properties of different tungsten oxide raw materials have an effect…

In addition to the excellent stability of the monoclinic blue tungsten oxide ceramic material, it also has a very strong optical absorption effect in the near-infrared light region, and has good biological compatibility. It can effectively convert light energy into heat energy. Killing cancer cells has potential applications in clinical tumor photothermal therapy. As a conventional ceramic material, monoclinic phase tungsten trioxide (WO3) has high chemical inertness and good biocompatibility. It can generate singlet oxygen under light. Therefore, it is…