Tailored Super-hard CVD diamond Coatings For Highly demandi ng Cutting Operations
The continuous rising demand on efficiency and productivity of cutting operations and the increasing amount of composite materials to be machined require tailoring the properties of the coated tool’s according to the corresponding specific application. It is known that fibre reinforced materials as well as other high-tech materials e.g. green compacts, non ferrous alloys, intermetallics, printed circuit boards (PCB) and extremely abrasive Al-Si and Ti-Al alloys can not be machined with conventional tools, but require tailored diamond coated tools for reasonable machining operations. These demands could be met by specific pre-treatment of the cemented carbide tools to guarantee a perfect adhesion and improved interface. Furthermore, the morphology of the diamond coatings could be exactly controlled leading to micro- and nano-crystalline as well as multilayered coatings and thus increase fracture toughness. It is even possible to sharpen diamond cutting edges for machining of wood or chipboards. The different treatments and processes may be used separately or combined in order to produce ideal fitted diamond coated tools for specific applications and achieve an optimum performance in cutting operations at reasonable costs. This is illustrated here by selected cutting test results in most demanding applications. The High Ionization Pulsing (h.i.p..) technology with high ionization and a low deposition temperature of less than 200°C is predestined for the deposition of amorphous carbon coatings like hard and smooth diamond-like carbon, DLC. The advantage of the low deposition temperature allows coating of most temperature sensitive materials. In principal DLC coating exists out of a linked amorphous carbonmatrix with varying amounts of sp2 and sp3 bonding. Micro- or nanocrystalline superhard diamond coatings, produced by hot-filament CVD technology, exist out of sp3 bounded carbon. But the gap between DLC and diamond closed recently as new carbon coatings are created. This presentation makes an attempt at showing the morphology of microcrystalline multilayer diamond coatings which are extremely resistant to abrasion as well as nanocrystalline coatings which have an extremely smooth, shiny and hard surface. The efficiency and performance of exactly controlled diamond coatings on cemented carbide tools with almost any geometry and with a high cobalt content of up to 12 percent will be illustrated by representative cutting test results from aircraft, automobile and electronics industry.
Diamond Like Coating Microcrystalline Multilayer Diamond Coating,Cemented Carbide Tools.
R.Cremer W.Reichert S.Kyrsta O.Lemmer
CemeCon AG Adenauerstr.20 A 4,52146 Würselen,Germnay
国际会议
西安
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）