Tungsten Chromium Carbide Coatings Carbide type and volume percentage are critical to the ultimate abrasion resistance of any material used for wear resistance. Cemented carbides are carbides in particle form bonded with a metal usually Cobalt or Nickel. Hardness varies but all cemented carbides are harder than the hardest metals. carbide with a Vickers number of 1700-2400 (85 HRC equivalent) is composed of 90% carbide particles by weight, 80% by volume. Most standard wear resistant alloys contain a maximum of 35% by volume of softer chromium carbide. We offer two basic coating options, tungsten carbide (XC1000, XC1000Ni, XC9000) and chromium carbide (XC4000). The main difference between these coatings is their maximum service temperature limitation. Tungsten carbide has a max temperature rating of 730 F (400C) and chromium carbide 1300F ( 725C).
Chromium carbide is indicated where significant corrosion is expected or where high process temperatures are required. (Cleaning ovens require the use of XC4000). XC9000 is a unique product that is optimized for fine particle abrasion resistance. Of the tungsten carbide particles in this material 30% of the mixture is sub-micron sized. These smaller carbide protect the spaces between the standard 2-5 micron size particles which adds about 25% more wear resistance. XC9000 is intended for use in metal injection molding, ceramic molding, and where high loadings of fine particulates accelerate wear. NiBoride: Wear Resistance for ID Surfaces from .0005” to .005” Thickness. Our “NiBoride” coating is a proprietary composition of Nickel and Boron with a Knoop hardness of 1000-1100 HK (70-74 HRC).
Post heat treatment produces a dense, crystalline structure of wear resistant Nickel Boride (Ni3B) with excellent abrasion resistance. The coating has a low coefficient of friction, high bond strength and can withstand high temperatures. Similar to the Electroless Nickel plating process, NiBoride can be deposited uniformly from .0005” up to .005” (12½ to 125 micron) thickness on virtually any metallic substrate. Complex shapes and inside diameters are candidates for our NiBoride coating. The as-plated surface finish is approximately 32 RMS (0,8 mm Ra). Polishing can meet almost any surface finish requirement, including a mirror finish. This plating technology has value in any application where a small wear tolerance and adhesive or low stress abrasive wear shorten component life.
If you have a question or an immediate price quote, please call Rimas at: (708) 269-3207.