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Frankenblick, Germany

Lagos M.A.,Tecnalia | Agote I.,Tecnalia | San Juan J.M.,University of the Basque Country | Hennicke J.,FCT Systeme GmbH
TMS Annual Meeting | Year: 2014

Until now TiAl alloys have been produced using a variety of processing methods including forging, extrusion, casting, etc. One important problem is the variation in mechanical properties caused by the segregation in the composition. In order to improve these segregations, powder metallurgy is an interesting alternative for the processing of TiAl alloys. However, some drawbacks of PM have limited the practical application of TiAl alloys such as the costs of the pre-alloyed raw materials, the use of expensive processing methods like HIP, etc. This work presents the activities performed at Tecnalia in the development of novel cost effective PM processing routes. Processes like Spark Plasma Sintering and Combustion Synthesis will be presented. Microstructures, crystallographic phases, chemical analysis and mechanical properties (tensile and creep) of the different processing routes will be detailed. Main advantages of these methods are the short processing time and the possibility of using elemental powders. Source

Guillon O.,Friedrich - Schiller University of Jena | Guillon O.,Institute for Energy Research of Germany | Gonzalez-Julian J.,Friedrich - Schiller University of Jena | Dargatz B.,Friedrich - Schiller University of Jena | And 4 more authors.
Advanced Engineering Materials | Year: 2014

Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered. © 2014 The Authors. Advanced Engineering Materials Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Saheb N.,King Fahd University of Petroleum and Minerals | Iqbal Z.,King Fahd University of Petroleum and Minerals | Khalil A.,King Fahd University of Petroleum and Minerals | Hakeem A.S.,King Fahd University of Petroleum and Minerals | And 4 more authors.
Journal of Nanomaterials | Year: 2012

Metal matrix nanocomposites (MMNCs) are those metal matrix composites where the reinforcement is of nanometer dimensions, typically less than 100nm in size. Also, it is possible to have both the matrix and reinforcement phases of nanometer dimensions. The improvement in mechanical properties of MMNCs is attributed to the size and strength of the reinforcement as well as to the fine grain size of the matrix. Spark plasma sintering has been used extensively over the past years to consolidate wide range of materials including nanocomposites and was shown to be effective noneconventional sintering method for obtaining fully dense materials with preserved nanostructure features. The objective of this work is to briefly present the spark plasma sintering process and review published work on spark-plasma-sintered metals and metal matrix nanocomposites. Copyright © 2012 Nouari Saheb et al. Source

Kessel H.U.,FCT Systeme GmbH | Hennkke J.,FCT Systeme GmbH | Kessel T.,FCT Systeme GmbH
CFI Ceramic Forum International | Year: 2010

This article discusses the advantages of reduced sintering times, deducing the motivation for the development of new short-time sintering techniques in line with the conventional sintering methods. An introduction is given into various short-time sintering techniques highlighting their benefits and possibilities as well as their limitations. Finally the most important development trends are presented, which are expected to facilitate further progress in terms of cost and resource efficient production and material development. Source

Hennicke J.,FCT Systeme GmbH | Kessel H.U.,FCT Systeme GmbH | Kirchner R.,FCT Systeme GmbH
CFI Ceramic Forum International | Year: 2011

Based on an integrated definition of "efficiency", this article explains concepts and principles useful for the realization and improvement of high-efficiency sintering equipment. Real industrial applications and plants are cited for further clarification. In addition, a report is given on the most important ongoing developments that will lead to continuing progress in the efficiency of modern sintering technology. Source

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