Fabrication and application of nano/microcrystalline composite diamond coated drawing dies using alternative carbon sources

基于交替碳源的微纳复合金刚石涂层拉拔模的制备及应用（英文）

Nano/microcrystalline composite diamond films were deposited on the holes of WC-6%Co drawing dies by a two-step procedure using alternative carbon sources, i.e., methane for the microcrystalline diamond（MCD） layer and acetone for the nanocrystalline diamond（NCD） layer. Moreover, the monolayer methane-MCD and acetone-NCD coated drawing dies were fabricated as comparisons. The adhesion and wear rates of the diamond coated drawing dies were also tested by an inner hole polishing apparatus. Compared with mono-layer diamond coated drawing die, the composite diamond coated one exhibits better comprehensive performance, including higher adhesive strength and better wear resistance than the NCD one, and smoother surface（Ra=65.3 nm） than the MCD one（Ra=95.6 nm） after polishing at the same time. Compared with the NCD coated drawing die, the working lifetime of the composite diamond coated one is increased by nearly 20 times.

基于交替碳源、采用两步法将微纳复合金刚石薄膜沉积在WC-6%Co硬质合金拉拔模的内孔基体上,其中甲烷和丙酮分别用于微米层和纳米层的沉积。此外,基于甲烷制备的单层微米金刚石和基于丙酮制备的单层纳米金刚石涂层模具分别作为对照组。金刚石涂层拉拔模具的附着力和磨损率采用内孔抛光设备进行检测。与单层金刚石涂层拉拔模具相比,复合金刚石涂层模具表现出更优异的综合性能,包括比单层纳米金刚石涂层模具更高的附着力和耐磨性,以及在相同时间抛光后比单层微米金刚石涂层(R_a=95.6 nm)模具更光滑的表面(R_a=65.3 nm)。与纳米涂层模具相比,复合金刚石涂层模具的寿命提升近20倍。