You&#;ve read all about the advantages of PVD coating. You have an idea of what color you want for your final product and have determined that PVD can provide the finish you desire. Before signing on the dotted line, it&#;s important to know what types of material can be PVD coated. Based on the base material of your product, PVD may be a viable choice for metal finishing.
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Some base materials adhere better with the metal deposition than others. In order to achieve the most durable and most attractive metal finishing, it&#;s essential to choose the right process. Depending on the material, nickel or chrome electroplating may be required for the best outcome. Some materials take the PVD coating directly better than others.
PVD can be coated on most metals, though some materials require a base layer of nickel and chromium in order to improve corrosion resistance.
PVD coating is a versatile process that can be used on a variety of materials, including temperature-sensitive plastics. These types of materials use the LTAVD process, which uses a lower temperature PVD process to deposit metal coatings.
Because PVD coatings can be applied to a wide spectrum of substrates, or base materials, it continues to grow in popularity for metal finishing. Depending on the gasses added during the PVD process, different colors could be achieved. Choosing PVD coatings as your metal finishing doesn&#;t limit your color choice to metallic, which is attractive in many industries. PVD coating shines as a strong option for both functional and decorative metal finishes.
Have questions about whether the substrate of your product can be coated using the PVD process? Contact Bend Plating for more information about PVD coating and what substrate materials work best with the process.
Materials that can be coated include carbides, high speed steels, hot work tool steels, certain copper alloys, stainless steels and nitridable alloy steels. Cold work tool steels can be coated if they are tempered at least three times at the maximum secondary hardening temperature. In general all materials that can withstand a coating temperature of 500ºC, without softening or distortion, can be successfully PVD coated. Certain coatings are applied at 600ºC and these are in general only suitable for carbide substrates. Brazed parts can also be coated if the brazing material is temperature resistant (melting point > 600°C) and does not contain cadmium or zinc. Our first recommendation is that each new application should be evaluated using the combined knowledge of the tool user and coating center specialist to choose the best pre-treatment and coating.
Heat treated materials such as carbon and low alloy steels with tempering temperatures below 450°C will lose hardness points due to coating temperatures.
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Assemblies, tools or parts that are glued, pinned, pressed or screwed together in a fixed or permanent position. Any alloy materials which contain Zinc, Tin or Cadmium and other low vapor pressure alloy additions. Leaded alloys, fusible alloys and most aluminum, zinc and magnesium alloys having low melting points.
Fine ground surfaces with a bright finish are best for maximum coating adhesion. Ground surfaces should be free of burns, cracking and grinding wheel glazing. Free cutting CBN grinding wheels produce excellent surfaces for coating due to lower grinding temperatures.
These surfaces can be successfully coated. However due to varying surface conditions, testing may be required to achieve the best coating adhesion.
The components must be held for coating; therefore they must have holes, threads or surfaces that can remain uncoated. In order to coat a component all over generally requires two coats and is charged accordingly. It must be possible to mechanically mask surfaces which are to remain uncoated.
Components with internal surfaces (holes, slots) can also be coated. Depending on the geometry of the component, the coating thickness decreases with the depth of the hole or slot. Blind holes and female threads must be free of hardening salts and other contaminants. It is for this reason vacuum heat treatment is strongly recommended when PVD hard thin film coatings are to be applied.
For components that have been previously used in service prior to coating, please inform our staff as out-gassing is required to optimise coating adhesion.
Titanium Coating Services can chemically strip old coatings from ferrous components. The process takes place at low temperature and only removes the coating, leaving the substrate in its previously uncoated condition. If it is necessary to rework or recoat a component, speak to our engineers to see if stripping will give you superior results. Yes we can strip Coatings from Carbide substrate..!
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