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Tungsten Carbide Coating - Basic Information Required

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Q. As a design engineer I am looking for basic information regarding Tungsten Carbide Coating as follows : Details of process, Material preparation, Advantages & Disadvantages, Comparison against Hard Chrome Plating.

Any inherent problems with the finish, etc., suggested reading lists or other useful sites.
I will be grateful for any information supplied.

Thanks, Mandy

Mandy B [last name deleted for privacy by Editor]
a pump mfgr. - Manchester, Lancashire, England. UK.


A. There are three commonly methods to deposit tungsten carbide (WC) over ferrous substrates. Two involving extreme heat are: a) Welding with steel or alloy rods loaded with WC powder (low percentage of WC, heat distortion and surface irregularities as any weldment). b) Thermospray and fuse with WC+Alloy powder (medium content of WC, heat distortion and a slight better surface). c) HVOF. This involves the use of high tech equipment that sprays at supersonic velocities a mixture of high content of WC+Cobalt (88%+12%). This high impact produces a very good bond when the surface is properly prepared and is considered to be low-temperature. Surface like a fine emery paper. After grinding is considered a substitute for chrome in certain applications.

Guillermo Marrufo
Monterrey, NL, Mexico


A. Tungsten carbide is also deposited by PVD and electro-spark deposition. The PVD-deposited WC is not a good substitute for hard chrome -- it's used more as a solid lubricant, having a high C content. Electro-spark deposition is a welding process carried out at room temperature. While the coatings are quite good -- better than hard chrome -- and the coating equipment quite affordable, the process is not well-suited for coating large objects.

jim treglio portrait
Jim Treglio
PVD Consultant - San Diego, California


Q. Thanks for your information. Can anybody suggest any good web sites to look at ?

Mandy B [last name deleted for privacy by Editor]
- Manchester, England, United Kingdom


Q. Can somebody comment on the use of Tungsten Carbide to keep cutting knives for packaging machines sharp? The knives are toothed and the points of the teeth need to stay sharp. They have a 52-56 Rockwell Hardness. Would the Tungsten Carbide treatment have a tendency to slightly round or dull the points? Seems like the depositing method would have to be by electro-spark so that there is no heat generated during the process.
Any help here would be appreciated.

John V [last name deleted for privacy by Editor]
- Belleville, Illinois


A. John,

In answer to your question regarding tungsten carbide coating hss slitting blades for your packaging equipment.

Depending on the type of equipment being used to deposit the carbide, via spark generation, heat is a factor.

The use of a unit which uses 3 phase power and has a series of internal transformers and rectifier is your best choice. The Carbumatic machine is one of the best available to do the job for you. I have been using this equipment for the past 40 years with excellent results,

You can keep the edges sharp without sharpening afterward and you will not anneal the tool.

John Vacval
- Elgin, Illinois


RFQ: Can anybody provide me with a way to reach the company that makes the Carbumatic machine that is used to apply the tungsten carbide?

John V [last name deleted for privacy by Editor]
- Belleville, Illinois
^- Sorry, this RFQ is outdated
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July 18, 2008

Q. Want to know mfgr. of tungsten carbide coating equipment

suresh parsramani
- Mumbai Maharashtra India
^- Sorry, this RFQ is outdated
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Welding of Tungsten carbide coating

July 23, 2018

Q. What is the process for welding TCC in pipe ID. Machine type, method, etc.

guna sekaran
MICRONE INDUSTRIES - chennai india

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