Development of high-strength, damage-tolerant CVD-diamond-foil compounds

在第二个资助期内，将对第一个资助期内产生的新型PVD/CVD原位层压板的性能和工艺技术进行进一步开发，并准备在不同基材上应用。重要的出发点是金刚石结构的适应性及其残余应力和形貌，以便在减小晶粒和面尺寸的基础上实现单片金刚石强度的增加。此外，金刚石-金属层压板的界面粘附强度的调整是通过金属层间厚度和化学成分的特定调整来实现的。新的金刚石-金属层压板将通过原位3点和4点弯曲和有限元建模的方法进行机械表征。一个新的焦点是通过4PB剥离测试实现界面附着力的量化，其中单个层压板层被预损坏。针对可能的应用，研究了一种新型的低热自焊原位焊点与活性纳米焊点箔。基于这些发现，正在考虑直接在层压板上进行自焊接纳米pvd中间层的单独加工。基材上的附着力或界面附着力也通过预损伤弯曲梁的4PB剥离试验来表征。优化的层压板和焊接的保护效果将通过洛氏c压痕和摩擦学测试来表征。最后，为了证明金刚石-金属层压板与纯金刚石层压板相比具有更好的性能潜力，采用了一种适用于铝拉丝模具摩擦系统的通用摩擦计进行了展示研究。

In the second funding period, the novel PVD/CVD in-situ laminates generated in the first funding period will be further developed in terms of their properties and process technology and prepared for application on different substrates. Important starting points are the adaptation of the diamond structure and thus its residual stresses and topography in order to achieve an increase in the strength of monolithic diamond, based on a reduction in the grain and facet size. Furthermore, an adjustment of the interface adhesion strength of the diamond-metal laminates is to be achieved by a specific adjustment of the metallic interlayer thickness and the chemical composition. The new diamond-metal laminates will be mechanically characterised by means of in-situ 3- and 4-point bending and FEM modelling. A new focus is on a quantification of the interfacial adhesion, realised by 4PB peel tests, where single laminate layers are pre-damaged. With regard to a possible application, novel low-heat self-soldering in-situ solder joints with reactive nano-solder foils are investigated. Based on these findings, a separate processing of self-soldering nano-PVD interlayers directly on the laminate is being considered. The adhesion or interfacial adhesion on the substrates is also characterised via 4PB peel tests with pre-damaged bending beams. The protective effect of the optimised laminates and soldering will then be characterised by means of Rockwell-C indentation and tribological tests. Finally, a showcase study is carried out with a universal tribometer adapted to the tribological system of aluminium drawing dies in strip drawing in order to demonstrate the better performance potential of diamond-metal laminates compared to pure diamond.