by Kat Griffin Kat Griffin

CVD Diamond Coated Tools: Graphite Machining Edge

CVD Diamond Coated Tools

Graphite is a material that is relatively easy to machine, but its abrasiveness poses challenges for carbide tools. However, CVD diamond coated tools offer a ideal solution, as they last 12-20 times longer than carbide tools when machining graphite, and sometimes even longer.


What is Diamond Tool Coating?

Diamond coating, also known as diamond film deposition, is a process where a thin layer of synthetic diamond is applied to the surface of cutting tools, drills, end mills, inserts, or other types of industrial tools. The coating is typically applied using methods like Chemical Vapor Deposition (CVD) or Physical Vapor Deposition (PVD).

For non-ferrous metal materials, CVD (chemical vapor deposition) diamond coating is an excellent option. It proves to be an ideal coating for metal matrix composite (MMC), high silicon aluminum alloy, machining graphite, and other abrasive materials. However, it’s important to note that diamond-coated tools are not suitable for cutting steel due to the considerable heat generated and the potential for chemical reactions that could harm the machining process.


Why Should You Choose CVD Diamond Coating for Graphite Machining 

Diamond coated end mills have a very wide operating range from 200 to over 2,000 surface feet per minute. This provides an opportunity for significant productivity increases. Other benefits of diamond tool coatings include:

  • Extended tool life from 5-25 times longer than uncoated carbide
  • Best edge retention for consistent finish
  • Best tolerance retention
  • Improve abrasion resistance
  • Decreased down time for tool changes
  • Higher productivity from increased feeds and speeds


MWI, Inc. carries Black Diamond Shredder roughing end mills for all your heavy-duty graphite machining needs. These end mills are designed to remove large amounts of material quickly and more efficiently than standard end mills. Interested in learning more about the Shredder Style Cutter, click the link here or email us today at To view our Black Diamond CVD End Mill brochure, click here!