Erik Päßler

Integrated Framework for Life Cycle-Oriented Evaluation of Product and Process Technologies: Conceptual Design and Case Study

In order to capture long-term effects of technology decisions regarding technical, economic or ecological targets of a company and its supply chain partners, life cycle-oriented evaluation of product and process technologies is necessary. For enabling a systematic evaluation, methodological support is needed. Thus, this chapter presents a framework for life cycle-oriented evaluation of product and process technologies consisting of three pillars: generic product, life cycle and process models, a decision theory-based procedure model allowing a structured and integrated evaluation, and a method and tool set. The framework will be illustrated by a case study of life cycle-oriented evaluation of alternative technologies for manufacturing mountain bike-frame components.

Development and Characterisation of Phenolic Resin Moulding Materials for the Production of New Short Fibre-Reinforced C/C-SiC Composites

This article focuses on the development of phenolic resin moulding materials for the production of new carbon fibre-reinforced ceramic composite materials based on C/C-SiC by utilising the LSI (liquid silicon infiltration) production method. The production of these moulding materials is being accomplished by combining phenolic resin and carbon fibres with the addition of a few selected parts of processing aids, during which the influence of the used lubricants on the processability of the moulding materials is examined. The starting materials, microstructures and mechanical properties of the materials were characterised at every step of the entire process (CFRP and C/C composites) as well as the end of the whole production (C/C-SiC composites). During this investigation a link between the portions of the lubricant used, the forming of the porosity and the impact on the mechanical properties was discovered. In regards to the optimisation of the process the involved parties were able to determine an optimal lubricant ratio.

An innovative production method for a C/C-SiC brake disc, suitable for a large-scale production

The industrial progress and the market-oriented management concepts result in increasing demands of the industry for improved performances while simultaneously improving on the energy efficiency. This results in the necessity for a progressive implementation of high-performance materials in areas such as the automotive industry, engineering, as well as applications in aerospace industry. Especially construction elements taking on large stresses call for excellent mechanical properties even at extremely high temperatures. In these high-temperature ranges only engineering ceramics, which unfortunately are very limited regarding the application due to the very brittle characteristics, showcase sufficient strength values.

Großserientaugliche Formgebung durch Duroplast-Spritzgießen zur Herstellung von faserverstärkter Keramik

KurzfassungIn gemeinsamer Kooperation der Professuren Verbundwerkstoffe (Prof. G. Wagner), Strukturleichtbau und Kunststoffverarbeitung (Prof. L. Kroll) sowie Polymerchemie (Prof. S. Spange) der Technischen Universität Chemnitz wurde ein großserientaugliches Formgebungsverfahren zur Herstellung faserverstärkter C/C-SiC-Verbunde entwickelt. Das Verfahren wird die Produktionskosten erheblich senken.AbstractIn joint cooperation of the departments of composite materials (Prof. G. Wagner), lightweight structures and polymer technology (Prof. L. Kroll), and polymer chemistry (Prof. S. Spange) of Technische Universität Chemnitz a process suitable for large-scale production of fibre-reinforced C/C-SiC composites has been developed. This process will significantly reduce the production costs.