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Activated pressureless infiltration of metal-matrix composites with graded activator content
Authors:M. Bahraini  T. Minghetti  M. Zoellig  J. Schubert  K. Berroth  C. Schelle  T. Graule  J. Kuebler
Affiliation:1. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstr. 129, 8600 Duebendorf, Switzerland;2. RUAG Technology, 6460 Altdorf, Switzerland;3. swissRTec AG, Reutistrasse 17a, 8280 Kreuzlingen, Switzerland;4. FCT Ingenieurkeramik GmbH, Gewerbepark 11, 96528 Rauenstein, Germany;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;2. Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan;1. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, China;2. State Key Laboratory of Electric Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an 710049, China;3. College of Materials Science and Engineering, Xi''an Shiyou University, Xi''an 710065, China;1. Institute of Ceramic, Glass and Construction Materials, Technische Universität Bergakademie Freiberg, Freiberg, Germany;2. Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg, Germany;1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 West Wenhua Road, Weihai 264209, China;2. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;1. Light Metal Division, Korea Institute of Materials Science, Changwon, 642-831, Republic of Korea;2. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250100, China
Abstract:Metal-matrix composites (MMCs) were produced by activated pressureless infiltration of porous Al2O3 compacts with the presence of elemental titanium as an activator and steel (X38CrMoV5-1) as the metal matrix. The quality of infiltration was subsequently investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The results show that poor quality of infiltration is associated with blocking of infiltration channels due to the formation of Ti-rich phases which are accumulated over infiltration depth. To prevent the pores blocking, a layer-graded activator green body in which the activator quantity is decreased with infiltration depth was used. Furthermore, it could be shown that the mechanism based on evaporation/condensation of metal onto activator particles is in agreement with the results of this study.
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