As bullets and shells shoot through barrels, the friction generates ... as compared with graphite’s 3 GPa. ‘Diamond-like carbon’ coatings are a mixture of sp1, sp2, and sp3 carbon.

I reached out to readjust the gun and, instead of setting it upright ... Physical Vapor Deposition (PVD), Plasma Enhanced Chemical Vapor Deposition (PECVD), and diamond-like carbon (DLC) coating, a ...