Corrosion resistance consolidation of a diaphragm type vacuum sensor
This paper describes the corrosion resistance consolidation of a diaphragm type vacuum sensor using a high corrosion resistance material. Initially, we had fabricated a vacuum sensor using a Ru based thin film amorphous alloy, whose high corrosion resistance was confirmed in wet tests. In the high corrosion gas tests, however, the sensor resists NF<inf>3</inf> and COF<inf>2</inf> gases but does not resist ClF<inf>3</inf> gas. Therefore, we searched for new Ni based amorphous alloys which can also resist ClF<inf>3</inf> using a combinatorial search based on a MEMS process. We were able to fabricate new sensors using Ni<inf>56</inf>Nb<inf>33</inf>Ti<inf>11</inf> and Ni<inf>49</inf>Nb<inf>35</inf>Ti<inf>16</inf> amorphous alloys which were shown to resist all three mentioned gases.
Effect of SiC size dimensions on the corrosion wear resistance of the electrodeposited composite coating
Advances in materials' performance often require the development of composite systems, of which coated materials are one form. The abrasion and corrosion resistance of components can be greatly increased by protective coatings and this is a growing industry of considerable economic importance. This paper aims with a comparative wear corrosion study of pure nickel and Ni-SiC nano structured composite coating. All the experiments concerning the effects of the rotation speed and the applied load on the corrosion behaviour and friction coefficient were carried out using the 0.5 M Na2SO4 neutral solution. The Ecorr values measured at different disc rotation speeds and different friction loads show some differences between the two types of coatings. For wear corrosion tests an apparatus constructed in the Electrochemistry Laboratory, Dept. of Materials Engineering of Trento University was used. A PMMA cell contained the test solution and a transmission shaft with the tested sample, in the shape of a disc (diameter 40 mm and height 18 mm), connected to an electrical motor. A moving rod held an alumina parallelepiped counterface and the imposing load system thus obtaining a sliding type wear system. 
 
 
 
Einfluss der SiC-Abmessungen auf den Korrosionsverschleiswiderstand von elektrolytisch abgeschiedenen Verbundbeschichtungen 
 
 
 
Fortschritte im Werkstoffverhalten erfordern haufig die Entwicklung von Verbundsystemen; beschichtete Werkstoffe sind ein Beispiel hierfur. Der Verschleis- und Korrosionswiderstand von Komponenten kann durch schutzende Beschichtungen erheblich verbessert werden und dies ist ein wachsender Industriezweig mit nennenswerter wirtschaftlicher Bedeutung. Ziel dieser Arbeit ist eine vergleichende Verschleis-Korrosions-Studie von reinen Nickel- und nanostrukturierten Ni-SiC Verbundbeschichtungen. Alle Versuche bezuglich des Einflusses der Drehzahl und der aufgebrachten Belastung auf das Korrosionsverhalten und den Reibungskoeffizienten wurden in neutraler 0,5 M Na2SO4 Losung durchgefuhrt. Die bei verschiedenen Drehzahlen und verschiedenen Reibungsbelastungen gemessenen Ecorr-Werte zeigen einige Unterschiede fur die zwei Beschichtungstypen. Fur die Verschleis-Korrosions-Versuche wurde eine im elektrochemischen Labor der Abteilung fur Werkstoffwissenschaften der Universitat in Trento konstruierte Apparatur eingesetzt. Eine PMMA-Zelle enthielt die Versuchslosung und eine Transmissionswelle mit der Versuchsprobe in der Form einer Scheibe (Durchmesser 40 mm und Hohe 18 mm), die an einen elektrischen Motor angeschlossen war. Ein sich bewegener Stab hielt das Gegenstuck aus Aluminiumoxid und das Belastungssystems, wodurch ein Gleitverschleissystem erreicht wurde.
Micro-forming of thin film metallic glass by local laser heating
This paper reports a new method for fabricating three-dimensional microstructure such as a bent micro beam made of a thin film metallic glass (TFMG). Metallic glasses are kinds of amorphous alloys and have suitable characteristics for microelectromechanical systems (MEMS) because they are isotropic and homogeneous as well as free from defects originated from the crystal structure. Moreover the metallic glasses soften in a certain temperature range called the super cooled liquid region (SCLR), which makes the metallic glasses easily be formed into three-dimensional shapes. In this paper, firstly, TFMG micro beams are fabricated using MEMS process. Secondly, a local laser heating and micro-forming system is introduced to heat and form a beam into a three-dimensional structure. Finally, as an example of a three-dimensional structure, a TFMG micro beam bent 90/spl deg/ is realized.