Coatings are the surfacing solutions providing unique properties to solve wear, gall resistance, corrosion, and a mating surface for seals. High velocity coatings applied with the correct combination of thermal and kinetic energy result in tremendous bond strength and density. Low application temperatures, high wear resistance, thin coatings, and precision finishing combine to surpass performance standards.
Alloy Carbide Company applies one of the best tungsten carbide coatings in the United States. We have taken years of high-pressure/high temperature experience and applied it to solve various wear and corrosion problems throughout the process environment.
Carbide coatings originated over 45 years ago when high-temperature/high pressure process surfaces unexpectedly became worn or corroded. The introduction of tungsten carbide coatings immediately created a new wear and corrosion resistant alternative.
Process engineers specify hard metals to combat problems such as abrasion, erosion, or corrosion in their high pressure process environments. They are now discovering that our coating of tungsten carbide, applied directly to high wear areas, will extend the life of exposed parts by as much as 10 times.
RAM Carbide Coatings: Solutions to Wear Problems
Our featured coatings are Rocket Applied Metallics (RAM), a high-velocity oxy-fuel (HVOF) process capable of applying a variety of metallic powders. Primarily, tungsten carbides are sprayed, achieving the best results as far as density, bond strength and wear resistance. However, Hastelloy™, Stellite®, Stainless Steel, and Ferro-Tic® powders are also sprayed effectively.
Our system utilizes high-pressure hydrogen and oxygen, flowing in a continuous stream through a uniquely designed gun. At nearly 6,000 fps an extremely high-velocity flame is created. Powder is then axially injected into the flame. The alloyed particles are heated and accelerated into the target surface, forming a dense, mechanically-bonded coating. This mechanical bond is greater than can be measured by ASTM procedure C 633-69 due to tensile failure occurring within an attaching epoxy.
Part temperatures are maintained below 300°F and post treatments to restore physical properties to the base material are not required. If specified, all of the RAM coating may be ground and polished to extremely fine finish requirements and dimensional specifications.
Alloy Carbide RAM coatings are technically supported by our highly experienced coating engineers to ensure consistent control through all processes.
RAM coatings are exceptionally effective in resisting “slide” abrasive wear, erosive wear, galling, corrosion and/or oxidation. ACC coatings are helping to extend the service life for parts in many varied industrial applications.
Besides our RAM tungsten carbide, we can provide other types of services such as hard metal cladding and overlays. These welded processes fill the gap between the thinner RAM coating (which is applied only up to .015″ thick) and solid carbide.
Evidence of a Good Coating: High Magnification & Testing
A tungsten carbide coating, at the microscopic level, reveals why one coating wears better than another. At ACC, we analyze test samples at 1,500X magnification to ensure quality in our coatings. The secret to a sound coating lies in the micro-structure: the composition and size of the carbide grains in the binder matrix, the extremely low porosity, the absence of cracks or voids, and the amount of residual stress in the coating.
Laboratory testing is the other proof of our work. We hold certification in down-stream and upstream markets for the petrochemical industry. Upon request, we can provide you with coupons or samples of our coatings for testing in your own laboratory.