In this final thesis a rough description of aluminium extrusion is made, the importance of temperature of both the raw material and the extruded profile for a good profile quality. The difficulty in controlling these temperatures are discussed and attempts to increase the control are described. The attempts are basically made by controlling the furnace that is heating the raw material. This is done in a manner that the raw material reaches its final temperature shortly before it is extruded. An IR-camera at the press can be used for profile temperature measurements. The profile temperature is in turn used to decide the raw material temperature. Finally some proposals are given that can lead to a more controlled temperature at raw material and profile.

Although the aluminium rolling industry is considered a traditional industry, but the majority of its products are supplied to the 3C market. Hence the industry can also be classified as a high-tech industry, and must therefore adapt to rapid changing market environments. In recent years, the rise of the four BRIC countries with their low cost labor and land, have gained advantages in the low end products. Yet,escalations of international raw material prices have forced the cost of raw materials in the aluminium rolling industry to close in at nearly 80%. Substitute products are at the same time being developed feverishly, posing great threats to the aluminium industry. The China Steel Aluminium Corporation (CSAC) is taken as a case example to study how concepts of innovation management can be applied to product development in an intense competitive environment. If both product differentiation and low cost can both be achieved to explore niche markets, innovative value is created and the company will find itself in a blue sea. This study is pivoted on management of innovations. The principal factors of innovation are innovation flow, technology innovation, product innovation, process innovation and organization innovation. Each principal factor is represented by four to five sub-factors, totaling 21 sub-factors. Through analytic hierarchy process (AHP), a questionnaire was developed. Experts and scholars in the field of aluminium rolling industry were requested to rate the factors. The results were analyzed using Expert Choice 2000 statistical software, and the key success factors for management of innovation in the CSAC derived. The principal factor for innovation is technology innovation, with product innovation, process innovation, innovation flow and organizational innovation being secondary factors. Among the sub-factors, eight sub-factors emerged as key success factors with evaluation weights over 5%. These are, in ranking sequence, technology optimization, product innovation leadership, technology enrichment, technology stocktaking, cross-functional team, technology monitoring and protection, product application and development, and, execution and application. Overall speaking, technology innovation is the core value of CSAC, particularly in the areas of strengthening technology optimization and technology enrichment. CSAC should dedicate more resources in research and innovation. Product strategy should evolve from application and development into product defense development. It is further suggested that the proportion of product leading innovation strategy should be increased. In the short run, the research resources of the mother company should be fully utilized. In the long term, internal research capability should be developed, that is to increase research funding. Additionally, organization learning is the source of enterprise innovation, while exploration for change opportunities is the basis for strategy formulation. Although these two factors have not been incorporated as key success factors, they should not be overlooked.

<p>The purpose of this report is to document the experiments carried out, methods used and results gained during research into how the silicon content of an aluminium alloy affects the coefficient of thermal expansion (CTE).</p><p>The goal of this paper is to better understand and to find a relation between silicon content and the coefficient of thermal expansion.</p><p>Experiments were carried out using carefully prepared samples of Al Si alloys (0, 7, 10 and 20% Si content). Using these alloys, the CTE could be measured using a dilatometer.Comparative analysis carried out could map the effects of silicon content on the coefficient of thermal expansion and an equation was created. Using simple graphs and the rule of mixture method, the authors were able to build a simple tool for calculating the CTE of specific aluminum silicon alloys.</p>

Das thermische Spritzen ist geeignet Kompositschichten herzustellen, deren Einsatzgebiet hauptsächlich im Verschleißschutz liegt. Bisher lag der Schwerpunkt in der Untersuchung partikelverstärkter Schichten. Inhalt der vorliegenden Arbeit ist die Herstellung und Charakterisierung von C-kurzfaserverstärkten Schichten mit einer Aluminiummatrix. Als Spritzverfahren kamen das DC-Plasmaspritzen und das HF-Plasmaspritzen zur Anwendung. Die Aluminiumpulver und Kohlenstoffkurzfasern werden dafür agglomeriert. Gegenübergestellt wurden für beide Spritzverfahren die Mikrostrukturen der Schichten und das Verschleißverhalten. Die Kompositschichten können im Vergleich mit unverstärktem Aluminium ein deutlich verbessertes Verschleißverhalten aufweisen. Dies konnte in Gleit- und Schwingverschleißprüfungen nachgewiesen werden. Weiterhin wird auf eine für thermisch gespritzte Schichten charakteristische Fasereinbettung in die metallische Matrix hingewiesen, die zu einem speziellen Schädigungsmechanismus bei den Verschleißtests führt.

Thèse de doctorat : Sciences. Mécanique : Ecole Centrale de Lyon : 2002. / Bibliogr. 161 réf.

Thèse de doctorat : Sciences de l'ingénieur. Option sciences des matériaux : Metz : 2001. / Thèse : 2001METZ028S. Bibliogr. p. 128-132.

Thèse de doctorat : Sciences. Mécanique : Ecole Centrale de Lyon : 2002. / Titre provenant de lé́cran-titre. Bibliogr. 161 réf.

Reproduction de : Thèse de doctorat : Science et génie des matériaux : Toulouse, INPT : 2005. / Titre provenant de l'écran-titre. Bibliogr. 72 réf.

Thèse de doctorat : Métallurgie : Paris 12 : 2004. / Titre provenant de l'écran-titre.

Reproduction de : Thèse de doctorat : Science et génie des matériaux : Toulouse, INPT : 2005. / Titre provenant de l'écran-titre. Bibliogr. 130 réf.