Low stressed functional diamond films

Advantages  Technology allows for improved diamond deposition process, which results in stronger adhesion.  Improved adhesion of the film produces lower stresses to thereby increase the drill lifetime.  When compared to untreated drill bit, our drill bit was able to drill over 100 holes, whereas the untreated only drilled 40 holes before breaking. o Increased durability over 50% Diamond films on Cobalt-Cemented Tungsten Carbide Twist Drills  There is a thermal mismatch of diamond films on cobaltcemented tungsten carbide (Co-WC) drills that leads to high stress.  This mismatch occurs due to the poor adhesion of the film.  Diamond coatings are desired due to high hardness and low friction, but suffer from adhesion problems, residual stresses, and a thickness threshold.  Our unique method allows for an engineering design of drill edge geometry to allow diamond films to be deposited with low stress. Inventor: