I'm not sure of the conditions. The application is oil-well drilling. The customer has most of his tools chrome plated, but for the sour wells the calcium chloride eats them away. It's an inner surface of a narrow bore tube that needs to be coated, so HVOF is out. We're looking to use a...
Interesting project. What do you mean by "high" temperature -- how high is high? It can't be that high if you're planning on oil lubrication.
Jim Treglio
As noted in the previous posts, manganese phosphate is very soft and does not provide any wear resistance. If your need is for a corrosion and wear resistant surface, we have found (and patented) that it is possible to phosphate hard-coated steels. Essentially, we deposit a hard coating such...
I'm organizing a conference for the National Association for Surface Finishers (NASF). The meeting is entitled "Surface Engineering for Energy Generation, Conservation, and Transmission." One of the sessions, not surprisingly, is on energy conservation, and we would like to have at least one...
gfansher is correct on the variations of TiN. In addition, there are at least three variations of the PVD process, depending on how the metal is vaporized: sputtering, e-beam evaporation, and cathodic arc.
Jim Treglio
For wear resistance you can try a hard PVD nitride, such as titanium nitride (TiN). For high temperature applications (over 500 C), titanium aluminum nitride (TiAlN) would be best. I'm not sure how the process will affect fatigue life for INCO 718.
Jim Treglio
A suggestion: sputter deposit a solid lubricant such as moly disulfide or tungsten disulfide on the shaft. These materials love high loads, especially tungsten disulfide, and will eliminate the galling as well as give you lower friction levels overall. There are companies that offer the...
We have a customer concerned about the corrosion resistance of Ti64, and would like to run some corrosion tests, such as ASTM B117. Does anyone know what a typical time to corrode for Ti64 is in an ASTM B117 test? How long does it take if it is Tiodized (alkaline anodized)?
Jim Treglio
Sputter-deposited molybdenum disulfide or tungsten disufide would work -- both are low friction coatings that generally resist chemicals -- but it would not be easy to coat the interior of your cylinder. You might have to add a base hard coating. Coating the blades would depend on whether or...
Three companies that come to mind in your area are Goldstar Coatings, Balzer's, and IonBond. If the tools aren't seeing much in temperature, either TiN or TiCN should suffice. If they get very hot, TiAlN would be the coating of choice. TiN is the cheapest, so I would start there.
Jim Treglio
If you want to go the route of building it yourself, you should hire a competent consultant. While you could learn much of it from the literature, in the long run it will save you a great deal of time and money to bring in someone who knows what to do.
Jim Treglio
TiN was originally deposited by CVD, and is still used on many tool inserts. However, the deposition temperature is quite high, so one generally does not coat high speed steel tools by CVD. The preferred method is by PVD. TiAlN is deposited by PVD. Other good tool coatings include ZrN and...
Suggest you seriously consider an alternative to cadmium plating. Several alternatives are now offered, including aluminum and nickel-zinc. ASM International and the National Association for Surface Finishers (NASF) are holding a joint meeting in January (Surface Engineering for Aerospace and...
Sputter-deposited molybdenum disulfide or tungsten disulfide should do the job. Both can handle -- indeed, work better -- under high loads. The tungsten version handles higher loads and temperatures, the molybdenum version yields a lower friction coefficient. Both can be obtained...
