Purple tungsten oxide, was also known as TVO (purple tungsten oxide). It is not a chemical compound sense, but comprise different chemical composition, such as arsenic trioxide, tungsten, copper, and low levels of tungsten trioxide. The relative content of these compounds depends on the purple tungsten oxide calcination parameters. Xiamen Tungsten Online Technology Co., Ltd. produces two kind of purple tungsten oxide which has oxygen content content standards. Purple tungsten oxide is mainly used in the production of tungsten metal powder and tungsten carbide. Tungsten can also be used to produce ultra-fine powder and nano-tungsten powder. Purple tungsten and other tungsten oxide have large differences on the internal feature and structure. It is each particle by needle or rod grains loose particles group, which has a great gap grain structure, low bulk density, this structure is conducive to the reduction process of hydrogen and water vapor infiltration escape, therefore, suitable for the production of fine particles. Reduction obtained from purple tungsten and the tungsten powder fine and uniform particle dispersion between good so it is suitable for the preparation of an ultra-fine grain cemented carbide materials.

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Solid tungsten carbide drills are made of cemented carbide, working in poor cooling and chip Conditions from the drill bit. High-end solid tungsten carbide drills bit products are mainly used in the automotive, aerospace, engineering machinery, high-speed, high-precision machining of other fields.

Solid tungsten carbide drills development status is reflected in two aspects. On the one hand, the Chinese market is currently common in high-end hard the whole drills, mainly from Europe, America, Japan and other industrialized countries, most of these companies in Singapore and mainland China have a lot of standard solid tungsten carbide drills inventory, and some non-standard solid tungsten carbide drills production also into China.

Solid tungsten carbide drills development status on the other hand reflects the current situation in most of the domestic enterprises of solid tungsten carbide drills with international line brand lies in the gap between design, manufacturing details, material selection and coating treatment. The performance gap between solid tungsten carbide drills largest domestic and specific products: drill for steel, replacing the gun drill whole twist drill, drill machining high-temperature alloys, high hardness steel and other materials. In these areas, there were only a few companies control the design and manufacturing technology.

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Tungsen carbide indexable inserts carbide material refers the indexable inserts that are made of tungsten carbide meterial. Tungsen carbide indexable inserts according to the shape can be divided into a diamond blade, triangular blade and circular blade. Tungsen carbide indexable inserts due to the strong hardness, long service life, commonly used in the cutting process. In the manufacturing process, tungsen carbide indexable inserts flaws embodied in easily chipped, not coated with the coating and corrosion spots and other fallout.

Tungsen carbide indexable inserts flaws affects the tungsen carbide indexable inserts performance, and therefore detect possible tungsen carbide indexable inserts flaws can further achieve prevention purposes. At present, the major domestic manufacturers of blades for tungsten carbide indexable inserts are used naked eye defect, magnifying glass, blowing oil-soaked sands, conventional testing methods and tools stereomicroscope microscope on the blade surface defect detection. These detection methods not only result in high labor costs, low efficiency, but also easily lead to missed. Undetected tool in use, especially in the case of high-speed cutting will result in serious consequences

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Purple tungsten oxide using the APT as raw materials,which is during at the closed furnace in the industry. Under certain conditions, adding NH3 during calcination, and the NH3 will decompose H2 and N2, it will form a wet hydrogen atmosphere furnace in the stove, so that APT under mild reducing atmosphere, gradually decompose, generating purple oxide reduction. There are many factors in the process of preparing purple tungsten, one by the hydrogen reduction of tungsten oxide mechanisms apparent hydrogen greater humidity, the temperature required to obtain the higher tungsten purple, so choose the calcination temperature should be 770 ~ 815 ℃, Second, in the calcination process feed speed, tube speed, NH3 traffic and others factors affect the production of tungsten purple in varying degrees. In the preparation of tungsten purple we should to coordinate various relationships in order to produce a single phase purple tungsten. Its chemical equations are: 3 [5 (NH4) 2O · 12WO3 · 5H2O] = 2w18O49 + 40H2O + 35H2 + 15N2. Comprehensive variety of experimental results can be obtained tungsten production purple optimum parameters are as follows:

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