A5033323476- Advanced machining processes and optimization
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Tribology and Lubrication Engineering
- Advanced Surface Polishing Techniques
- Advanced materials and composites
- Advanced Machining and Optimization Techniques
- Gear and Bearing Dynamics Analysis
- Engineering Technology and Methodologies
- Metal Forming Simulation Techniques
- Ion-surface interactions and analysis
- Adhesion, Friction, and Surface Interactions
Chemnitz University of Technology
2015-2024
The chemical vapour deposition (CVD) of mechanically stable diamond layers on steel remains a big challenge that is difficult to solve. As prerequisite prevent the undesired graphite formation during CVD process, we apply 5 μm thick titanium-nitride interlayer with boron doping (TiNB). However, adhesion layer still limited due large mismatch thermal expansion between and steel, causes very high residual stresses in coating cooling. This paper shows two approaches reduce these produce...
The coating of highly stressed components with chemical vapor deposition (CVD) diamond can extend their lifetime. In particular, the combination steel substrates layers would find many applications in industrial production. However, there are some challenges, for example, high mismatch thermal expansion between and diamond, which commonly leads to delamination coating. Thus, a pre-treatment substrate surface is needed. Particle blasting has been established studies as suitable process. apart...
Diamond coatings applied by chemical vapor deposition (CVD) provide extraordinary properties concerning hardness and wear resistance, which enables an increase of the performance or lifetime highly stressed components. In particular, combination steel substrates diamond allows for numerous applications in several sectors industry. However, there are significant challenges considering coating adhesion strength. For example, mismatch thermal expansion commonly leads to a delamination coating....
In the sheet metal forming industry lubricants are applied in processes to expand technological boundaries by reducing friction and wear. The between tool is crucial deep drawing process. Due economic ecological reasons aim of manufacturers reduce or even avoid use lubricants. Consequently, this approach enables both a shortening process chains an essential saving resources. advantages structured tools lubricated concerning reduction coefficient appearance lubricating micro pockets...
The importance of functional surfaces is continuously growing in the context increasing demands on sustainability performance, resource efficiency and manufacturing costs technical systems. For example, microstructured substrate can contribute to enhance adhesion layers, which turn ensure wear protection a highly loaded component. Many microstructuring processes require system change, entailing high costs. However, ultrasonic vibration superimposed machining (UVSM) be implemented as...
forming tool coating. Most of the tools are made steel, so that especially coatability steel by a polycrystalline diamond coating would rise range fields application. The CVD-diamond coatings deposited laser induced plasma CVD process, without vacuum chamber. Various surface microstructures were investigated regarding their influence on residual stresses to prevent flaking coating: one hand, deterministic structures generated ultrasonic vibration assisted milling (UVAM) and other stochastic...
Ultrasonic vibration superimposed face milling enables the generation of predefined surface microstructures by an appropriate setting process parameters. The geometrical reproducibility characteristics depends strongly on plastic material deformation. Thus, precise prediction emerging using kinematic simulation models is limited, because they ignore influence flow. Consequently, effects as well elastic deformation are investigated in depth finite element analysis. Microstructured surfaces...
Abstract A typical sealing system for rotating shafts consists of the radial shaft ring (RSS), lubricant and counter-surface (SCS) shaft. The properties machined surface SCS have an impact on system. structural pattern influences flow along axial direction. In this paper, a simplified micro scale hydrodynamic simulation model is presented in order to study determine induced by system, isolated from effects seal, allow rating surface. influence seal was neglected simulation. Simulated...
In metal forming, lubricants have to be used prevent corrosion or reduce friction and tool wear. From an economical ecological point of view, the aim is avoid usage lubricants. For dry deep drawing aluminum sheets it intended apply locally micro-structured wear-resistant carbon based coatings onto steel tools. One type these are diamond layers prepared by chemical vapor deposition (CVD). Due high strength diamond, milling processes unsuitable for micro-structuring layers. contrast this,...
Counter-surfaces for radial shaft seals are usually finished by infeed grinding to avoid macro twist structures on the surface since they can impose a conveying action lubricant. This lead either leakage or starved lubrication and subsequent thermal damage depending direction of said action. Turning processes offer more cost-effective finish, but conventional methods cause structures, which impair prevention sealing system. An approach production twist-free surfaces was developed based new...