Fabrication and application of chemical vapor deposition diamond-coated drawing dies

Adherent diamond coatings on cemented tungsten carbide substrates with new Fe/Ni/Co binder phase

“…This fact confirmed that the preparation of dense and tough hard metals using both finegrained WC and 5.8 wt.% Fe/Ni/Co is still a challenge for hard metal manufacturers. The B-37 sample showed a slightly lower density value (14.448 g/cm 3 ) than both the H-15C and X-10 cemented carbides, whose densities were 14.513 and 14.527 g/cm 3 , respectively. Therefore, as confirmed by SEM micrographs in Fig.…”

“…The gas phase was a mixture of methane and hydrogen containing 2.0% (v/v) CH 4 with an excess of H 2 . The total flow rate was 2000 standard cm 3 /min and the pressure during deposition was 3 kPa. Deposition temperature was controlled by Type K thermocouples and maintained at 750 T 30 -C. During the whole deposition process, the filament temperature was in the 2200-2300 -C range, as monitored by a two-colour pyrometer.…”

“…In fact, the direct deposition of CVD diamond onto WCCo parts and cutting tools results in components that have extremely high resistance to abrasion while retaining the high fracture toughness of the underlying cemented carbide substrate. As a consequence, diamond coatings on cemented tungsten carbide substrates are increasingly used in engineering applications which have to withstand progressively more arduous conditions [3][4][5][6][7][8][9][10].…”

Nanocrystalline diamond coatings on the interior of WC–Co dies for drawing carbon steel tubes: Enhancement of tube properties

“…Although conventional tungsten carbide (WC-Co) drawing dies are the best choice among the currently available materials, they are expensive and wear out, unable to meet high industrial demands. Therefore, it would be effective if a very high hardness and low surface roughness coating, such as nanocrystalline diamond (NCD), can be deposited on the interior of WC-Co drawing dies [1]. By depositing diamond thin films on WC-Co drawing dies, the hardness of diamond can be combined with the toughness of WC-Co, resulting in an outstanding wear resistance property.…”

Friction and cutting properties of hot-filament chemical vapor deposition micro- and fine-grained diamond coated silicon nitride inserts

“…Chemical vapor deposition (CVD) diamond has been widely used in cutting inserts [1][2] , drawing dies [3] , liquid pump seals [4] and human implants [5] due to its excellent properties such as low friction coefficient, high hardness and good wear resistance. Among the depositing methods of CVD diamond, the hot-filament chemical vapor deposition (HFCVD) method is cost-effective and much common.…”