Tungsten carbide coating method continues to progress, becoming more complex and diversified, so that the corresponding tungsten carbide coated tools development. Tungsten carbide coating method from the initial development of high-temperature chemical vapor deposition coating is a plasma chemical vapor deposition coating, the temperature chemical vapor deposition coating and ion-assisted physical vapor deposition coatings. Development direction carbide coating method is a physical vapor deposition.

Carbide coating types are constantly updated from a single compound coating towards the development of diverse and complex compound coating; coating layers from several layers to a dozen layers; a new type of coating substrates has also been introduced, carbide coating substrates with a graded structure of cemented carbide coated tool performance is further improved; the coating process not only upgrading, but also to achieve a flexible combination of a variety of techniques to obtain a high performance carbide coating Layer tool.

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Tungsten carbide coated tools, the composition and properties of the binder phase of Co tool substrate largely determines the strength and deformation characteristics of tungsten carbide cutting tools.There are two ways to change the Co composition and properties oftungsten carbide cutting tools, one is to heat the other is for tungsten carbide coated tools cryogenic treatment, cryogenic treatment has created a super-low temperature environment for tungsten carbide coated tools, increasing the degree of supercooling of the alloy of cobalt phase change of free energy difference increases, increasing the phase transformation driving force, thereby reducing wear and diffusion tool abrasive cutting process wear. Another aspect, there is information that the coefficient of thermal expansion than the WC Co more than three times, the binder phase is the main phase of the destruction of carbide cutting tools, Co phase is present in a large thermal stresses are negative factors. Cryogenic treatment enables the WC-Co cemented tungsten carbide cutting tools get better surface residual stress.

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Magnetization process is a method that place the tungsten carbide coated tools which containing magnetic element on the high-intensity pulsed magnetic field, the tool generates internal grain magnetostrictive effect under an alternating magnetic field, so as to cause lattice mobile and even cause changes in the internal structure of tungsten carbide coated tools surface residual stress generated in the manufacturing process to ease and release, reducing redistribution tool coating, grinding and stress and stress generated in use, enhanced blade chipping capacity, improve tool life, reducing tool changes and downtime, increasing the stability of tungsten carbide coated tools and devices, and to improve the finish of the workpiece surface. When cutting, cutting force and cutting temperature significantly reduced, thereby the life span of tungsten carbide coated tools after the magnetization process has improved significantly.
 

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• Turning tool bit for processing; tungsten filament of lighting equipments; variety of heat conductor. 
• Car bent axle; bits and pieces of cylinder barrel; ingredients for forging heat-resistant steels.
• Manufacturing of gun, artillery, rockets, satellite, aircraft and ship.

There are many tungsten carbide cutting tools coating preparation methods, vapor deposition is the main method of preparing tungsten carbide cutting tools coating which divided into vapor deposition comprises physical vapor deposition (PVD) and chemical vapor deposition (CVD). Compared with the CVD coating technology, PVD coating technology has the following advantages:

1. PVD coating depositing a low temperature, can be 200 ~ 600 ℃ and other superhard TiN coating deposition below, it will not reduce the bending strength of the original base material, between the coating and the substrate does not produce η phase, so no special carbide material, expanding the range of applications;

2. PVD coating has a fine structure, the internal compressive stress in the coating, anti-crack growth;

3.PVD coating can coate the surface smoothly, more effective than the CVD coating to prevent cross crack rake face, but also can reduce the friction coefficient;

4.Useing the sharp edge of the tool as a matrix which is very important for high-speed cutting.
 

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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