Special Forms Tungsten Oxide Producing Methods
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- Category: Tungsten Information
- Published on Thursday, 04 June 2015 17:56
- Written by xiaoshan
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Nano tungsten oxide has strong organizational ability to grow and in a stable reaction conditions the interactions between molecular are fairly obvious. Molecular can epitaxial growth which is accordance with lattice arrangement strictly and to form the formation ratio complete and single component structure. With the improvement of nano technology, now there have been some special form of tungsten oxide, including arborescent, clitheriform, nanorods, nanowires and other special forms. There are many methods to produce special form nano tungsten oxide which can be divided into three types: high-temperature synthesis, hydrothermal synthesis method, and solution low temperature synthesis method. Although high-temperature synthesis method is most common, but it has high requirements in equipment so this method is difficult wildly be used. The hydrothermal synthesis method is acidification W (CO) 6 and ammonium tungstate, the reaction is from 2 to 100 hours at 160-200 ℃ range in autoclave for produce different shapes of nanorods. This method is low cost so it can be widely used than high-temperature synthesis method. Solution low temperature synthesis method is a new invention so in produce special morphology tungsten oxide is not mature, but the method has attracted much attention and the prospects are very broad.
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Tungsten Carbide Rod Surface Roughness Affecting Factors
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- Category: Tungsten Information
- Published on Thursday, 04 June 2015 17:55
- Written by Cristina
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Tungsten Carbide Rod Surface Roughness Affecting Factors
Tungsten carbide rod surface roughness affecting factors including the granularity of grinding wheel, rotating speed of grinding wheel, the concentration of grinding fluid and granularity of tungsten carbide rod.
1.The granularity of grinding wheel. The grinding process of tungsten carbide rod is generally divided into two to three steps. The first few steps are coarse grinding and the last step is fine grinding. The higher the granularity of grinding wheel is, the finer the diamond particle will be. The grain will be more detailed and the product will be brighter.
2.Rotating speed of grinding wheel. If the rotating speed is high, the friction period with tungsten carbide rod will be shorter, so there will be less grain formed on the surface of tungsten carbide rod.
3.The concentration of grinding fluid. Although grinding fluid is just an auxiliary material, the concentration will also affect the surface roughness of tungsten carbide rod.
4.Granularity of tungsten carbide rod. Tungsten carbide rod is made of many particles. The finer the particle is, the gap between particles will be smaller, thus the density will be better. It is easier to polish.
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The Advantages of Tungsten Alloy Industrial Radiography Shielding
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- Category: Tungsten Information
- Published on Thursday, 04 June 2015 16:57
- Written by wenjing
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Industrial radiography is a method of inspecting materials for hidden flaws by using the ability of short X-rays and gamma rays to penetrate various materials. Tungsten alloy shield is widely used to produce radiography welding inspection shielding, ionizing radiation detector shielding, and container inspection radiation shielding in industrial radiography.
The advantages of tungsten alloy industrial radiography shielding：
Tungsten alloy materials has high density,and the characteristics of environment protection. Due to tungsten alloys have the ability of various high-ray shielding,tungsten alloy can be the good materials for industrial radiography shielding. The thickness 3mm of tungsten alloy can shield 95% of 150keV γ radiation. Tungsten alloy materials are suiting for high spatial resolution occasion, such as welding inspection.Tungsten alloy industrial radiography shielding with higher spatial resolution than lead shielding.
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Tungsten Trioxide Photochromic Properties
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- Category: Tungsten Information
- Published on Thursday, 04 June 2015 17:54
- Written by xiaoshan
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Tungsten trioxide as a transition metal oxide is an excellent photochromic material. The study found it under ultraviolet light will turn blue. And it can use in optical information storage and optical recording and other filed. Photochromic refer to compound A is subjected to the wavelength λ1 of light, can be generated product B specific chemical reaction which is different structures and spectroscopic properties. And on the other hand in the light of the wavelength λ2 or heating, products B can reversible generation compound A. The basic features of this process are: A, B under certain conditions is stable and color disparity is significant different. What’s more in the process A, B is reversible. When the energy of light which is greater than the band gap of WO3 light on the sample, then the electron-hole pairs are generated. Photo-generated electrons into the conduction band of WO3, and adjacent W6 + combine to generate W5 +. At the same time electron holes can react with water molecule which is adsorbed on the sample surface, weakening the water molecules bond H-O, caused by the decomposition of water molecules, generating protons. Proton release into the WO3 then is become blue H2WO3 which is tungsten bronze.
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Tungsten Alloy Radiation Shielding in Nondestructive Testing
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- Category: Tungsten Information
- Published on Thursday, 04 June 2015 16:53
- Written by wenjing
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Nondestructive testing or Non-destructive testing (NDT) is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage.
Industrial radiography uses gamma radiation to detect structural faults in materials such as metal and concrete. As with pipeline inspection, the equipment uses tungsten alloy radiation shielding for non-destructive testing, which is coupled with tungsten collimator. Gauging radioactive sources are used in industrial processes to measure thickness, density or levels of materials during production e.g. paper, plastic film, steel sheet or surface coatings.
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