Taking the brazing mechanism of alumina ceramics and kovar alloys as main research object, based on molybdenum–manganese metallization method, influence direct indirect processes morphology final connected layer is explored. Combined with SEM, EDS, microscopic morphology, hermeticity affecting ceramic–metal composite component discussed. Finally, through process, various joints good airtightnes...

The aluminum oxide materials are widely used in ceramics, refractories and abrasives due to their hardness, chemical inertness, high melting point, non-volatility and resistance to oxidation and corrosion. The paper describes work done on synthesis of α-alumina by using the simple, non-expensive solution combustion method using glycine as fuel.Aluminum oxide (Al2O3) nanoparticles were synthesiz...

Many advanced ceramics are formed by colloidal consolidation using techniques such as sedimentation, centrifugation, or pressure filtration. In all these, the minimization of density variations of various colloidally-consolidated cakes has not been examined systematically until recently. Schilling et al.' used y-ray densitometry to study the density variations in a sedimented cake and showed th...

Surface quality including surface roughness and edge chipping is a key process measure in micro ultrasonic machining (Micro-USM) as an efficient process for micromachining of hard and brittle materials. Process parameters such as ultrasonic vibration amplitude, static load, type of tool material, type and size of abrasive particles and slurry concentration can influence the surface quality. How...

Among glass-ceramics, MgO-Al2O3-SiO2 (MAS) system occupies an important place due to its good characteristics. In this study, the magnesite waste being industrial was evaluated for production of MAS glass ceramics and properties glass-ceramics produced were examined. For purpose, mixtures prepared using waste, quartz, kaolin alumina raw materials according chemical composition cordierite. Furth...

Controlling the chemical reaction rate concerning degradation and repair is found to be important design advanced self-healing ceramics. The recovery behaviors of strength stiffness were investigated by exposing aqueous solutions different pH calcium ion concentrations introduced crack on typical ceramics dispersed with alumina cement as a agent. undergoes following three stages: dissolution co...

Khaji, Z. 2016. Extending Microsystems to Very High Temperatures and Chemically Harsh Environments. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1424. 45 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9686-9. Aiming at applications in space exploration as well as for monitoring natural hazards, this thesis focuses on understan...

Timo Heikkinen. Bonding of Composite Resin to Alumina and Zirconia Ceramics with Special Emphasis on Surface Conditioning and Use of Coupling Agents. Department of Biomaterials Science, Institute of Dentistry, University of Turku. Annales Universitatis Turkuensis, Turku, Finland 2011. Dental oxide ceramics have been inspired by their biocompability and mechanical properties which have made dura...