In the role of external excitation source, a substance or a system has undergone significant changes in the color of the phenomenon known as discoloration. When the photochromic compound A subject refers to a certain wavelength of light irradiation, the photochemical reaction can occur to give the product B, color A and B is significantly different. B irradiation or by heating the additional beam of light can be restored to its original form A. Photochromic (Photochromism) is occurring under the action of a light reversible chemical reactions. As a transition metal oxide, tungsten oxide film is an excellent photochromic material, the study found tungsten oxide under UV light will turn blue. Because photochromic properties of tungsten oxide in the optical information storage, optical control, optical switches, field optics materials, optical information such as genetic material has broad application prospects and attracted much attention.

Photochromic effect mechanism of nano tungsten oxide film photochromic tungsten oxide accompanied by reversible oxidation - reduction reactions, discoloration mechanism available now widely recognized in 1975 by Faughnan proposed double charge injection / extraction model to explain that in the ultraviolet Under irradiation, valence band electrons are excited into the conduction band, and generates electron-hole pairs photogenerated electrons are then W (VI) to capture, generate W (V), while reducing species photogenerated holes or interior surface oxide film generating proton H +, implanted inside the film, and the reduced oxides generated blue tungsten bronze HxWO3, blue as a result of W (V) in the valence band electrons into the W (VI) conduction band transitions. W6 (A) + W5 (B) <=> W5 (A) + W6 (B), due to the above change does not disrupt the crystalline structure of the material, and therefore the oxidation of the photochromic effect with good reversibility and fatigue tungsten material performance.

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Tungsten carbide cutting tools in the process will produce debris, grit, they will affect the machining accuracy of tungsten carbide cutting tools, so these things need to be cleared up, which requires cutting fluid with good cleaning, chip effect. Surface of the oil to be some of the cutting fluid wetting surfactants, penetration, emulsifying and dispersing, thereby reducing the ability of oil adhered on the surface of the tungsten carbide cutting tools. Mobility and the presence of a certain pressure cutting fluid during use can be washed away debris produced during machining, abrasive grains, oil.

Meanwhile, in order to prevent the workpiece, machine tools and tungsten carbide cutting tools rust, cutting fluid should also have a good anti-rust. Rust-proof cutting fluid action mainly because of rust-proof cutting fluid additive added, anti-corrosion additives can be adsorbed on the surface of the machine tool and the workpiece to form a protective film to isolated or enhanced alkaline cutting fluid to prevent corrosion reaction of tungsten carbide cutting tools, which play rust.

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Photochromic properties of tungsten oxide in the optical information storage, optical control, field optical switches, optical device materials, optical information such as genetic material has broad application prospects. Using photochromic properties of tungsten oxide system has been designed, and creating a lot of practical applications of the device, such as can be used to split water WO3 / TiO2 composite solar cells while having photochromic properties of wisdom electrochromic window (PV-ECsmartwindows).

Dye-Sensitized Solar Cell

Dye-sensitized solar cell (DSSC) refers to the dye-sensitized nanostructured porous anodic film is a light, according to the principle of photovoltaic, solar energy directly into electrical energy in a semiconductor optoelectronic devices. Photoelectric conversion efficiency and a light film of the band gap of the anode of a great relationship, generally select the band gap of 3.2eV of TiO2 films as photoanode. WO3 with TiO2 has a similar band structure, but its band gap

Is relatively small, but the power of tungsten oxide dye-sensitized solar cells is sufficient to drive the use of tungsten oxide thin film electrochromic smart windows made color characteristics, such as electrochromic display devices. And so while using tungsten oxide photochromic - electrochromic device features a relatively simple in structure, green.

UV Film

Tungsten oxide sensitive to ultraviolet light, and therefore can be made into a film, coated on the windows to prevent ultraviolet damage to human body. If in the sunglasses plated tungsten oxide film, the light intensity when the automatic color UV shielding reducing UV damage to the human eye. Also tungsten oxide can also be used to detect whether there is presence of ultraviolet light and the intensity of ultraviolet size.

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When cemented tungsten carbide cutting tools in addition to frictional heat generated inside the metal molecules within the tool and the shear plane will produce the frictional heat generation, so that cemented tungsten carbide cutting tools the cutting zone temperature can reach 600 ℃ ~ 800 ℃, so require cutting fluid must have good lubrication and cooling performance.

Tungsten carbide cutting tools in the cutting process, the cooling effect of cutting fluid is mainly from the cutting area is quickly taken away by pouring hot coolant to the cutting tool tungsten carbide cutting tools zone generated during cutting, reducing tungsten carbide cutting tools, the temperature of the workpiece, tool life, reduce the thermal deformation of the workpiece, reducing thermal stress and improve the durability of tungsten carbide cutting tools, machining accuracy. Cutting fluid cooling mechanism is: a way to penetrate into the friction area, the deformation zone to play the role of thermal cooling. Cooling of the cutting fluid and the thermal conductivity, specific heat, and the flow rate for the fluid lubrication and related methods, thermal conductivity, specific heat parameters of the better the greater the cooling.

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