PROGRAMME and BOOK OF ABSTRACTS

Transcription

1 12 th CONFERENCE for YOUNG SCIENTISTS in CERAMICS PROGRAMME and BOOK OF ABSTRACTS October 18-21, 2017 Novi Sad, Serbia iii

2 LIST OF SPONSORS The European Ceramic Society The JECS Trust Fund Ministry of Education and Science, Republic of Serbia Provincial Secretariat for Science and Technological Development LIST OF ENDORSERS Faculty of Technology University of Novi Sad Tourist organization of Vojvodina Tourist organization city of Novi Sad iv

3 Organizer Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Novi Sad, Serbia Young Ceramists Network, The European Ceramic Society Scientific Committee Carmen Baudin Francis Cambier László Forró Konstantinos Giannakopoulos Horst Hahn Andraž Kocjan Akos Kukovecz Anne Leriche Karel Maca Branko Matović Marija Milanovic Liliana Mitoseriu Rodrigo Moreno Zbigniew Pedzich Mitar Perusic Lucian Pintilie Pavol Šajgalik Laura Silvestroni Alexandre Simões Vladimir Srdić Biljana Stojanović Paula Vilarinho Markus Winterer Louis A.J.A. Winnubst Instituto de Cerámica y Vidrio-CSIC, Madrid, Spain Belgian Ceramic Research Center, Mons Belgium Ecole Polytechnique Fédérale de Lausanne, Switzerland National Center for Scientific Res. "Demokritos", Greece Forschungzentrum Karlsruhe, Germany Jožef Stefan Institute Ljubljana, Slovenia University of Szeged, Hungary University of Valenciennes & Hainaut-Cambresis, France Brno University of Technology, Czech Republic Institute for Nuclear Sciences Vinca, Serbia University Al. I. Cuza, Romania Institute of Ceramics & Glasses, CSIS, Madrid, Spain AGH, University of Science and Technol, Krakow, Poland University of East Sarajevo, Bosnia & Herzegovina National Inst. Materials Physics, Bucharest, Romania Inst. Inorganic Chemistry Academy of Sciences, Slovakia CNR-ISTEC, Faenza, Italy Universidade Estadual Paulista UNESP, Brazil University of Belgrade, Serbia University of Aveiro, Portugal University of Duisburg-Essen, Germany University of Twente, The Netherlands Secretary Ivan Stijepović Organizing Committee Branimir Bajac Elvira Đurđić Nikola Ilić Saša Lukić Stevan Ognjanović Laura Silvestroni Jovana Stanojev Đorđije Tripković Guilhermina F. Teixeira Jelena Vukmirović IMSI University of Belgrade, Serbia University Duisburg Essen, Germany University Duisburg Essen, Germany CNR-ISTEC, Faenza, Italy Technical University of Denmark, Denmark UNESP, Araraquara, SP/Brazil v 12

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5 12 th Conference for Young Scientists in Ceramics, CYSC-2017 Novi Sad, Serbia, October 18-21, 2017 OA-90 STABILIZATION OF HIGH CONCENTRATED ALUMINA SUSPENSIONS BY DIFFERENT DISPERSANTS I. Sever, M. Majić Renjo, Z. Šokčević, I. Žmak Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia Slip casting is a widely used colloidal technique for the consolidation of ceramic powders from a suspension. The colloidal approach ensures homogeneous green body microstructure, therefore reducing post-sintering machining and production costs. The process itself consists of several steps. Firstly, dispersion of powder with controlled characteristics in a liquid, which is usually water, followed by stabilization of the new obtained suspension using different dispersants. When an optimum dispersion of particles is achieved and thus low slip viscosity, ceramic slurry can be poured in a porous mold, usually a gypsum one. The influence of different dispersants on rheological properties of highly concentrated alumina (Al 2 O 3 ) suspensions was investigated. Used dispersants were Darvan C-N (an ammonium polymethacrylate water solution), 4,5-dihydroxy-1,3- benzenedisulfonic acid disodium salt and citric acid. The amount of dispersants was varied from wt.% in order to determine the optimal one. Rheological properties of prepared suspensions were determined by measuring the apparent viscosity at different shear rates. The optimum amount for Darvan was 0.75 wt.%, 0.1 wt.% for 4,5- dihydroxy-1,3-benzenedisulfonic acid disodium salt, and 0.3 wt.% for citric acid. The obtained results show that the most effective dispersant is 4,5-dihydroxy-1,3- benzenedisulfonic acid disodium salt given that only 0.1 wt.% was needed to stabilize the 70 wt.% Al 2 O 3 suspension. Acknowledgements: This work has been fully supported by Croatian Science Foundation under the project IP : Monolithic and composite advanced ceramics for wear and corrosion protection (WECOR). 107

6 12 th Conference for Young Scientists in Ceramics, CYSC-2017 Novi Sad, Serbia, October 18-21, 2017 shows good continuously. Roughness criteria of the film obtained from the suspension with temperature of 25 C were: Rz = 110 nm, Ra = 43 nm. The average thickness was 900 nm and tape was strongly fragmented. The obtained data shows that pre-cooling of suspension is not only improves continuous of the tape on lyophobic carrier without changing the chemical composition, but also reduce the thickness and roughness of the film. OA-92 WEAR MECHANISMS OF MONOLITHIC CERAMICS I. Primorac, K. Grilec, L. Ćurković, M. Majić Renjo Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia ivan.primorac@fsb.hr Advanced ceramics have been extensively used as anti-wear materials for various engineering applications, because of the wide range of their good properties, such as high temperature stability, hardness and strength, good wear and corrosion resistance, particularly at elevated temperatures where metal matrix composites have proven to be inadequate. Among the advanced oxide engineering ceramics, alumina ceramics have the unique combination of desirable properties for different applications: good wear and corrosion resistance, high hardness, excellent oxidation resistance and low production costs. Wear is one of the most commonly encountered industrial problems, leading to frequent replacement of components. Solid particle erosion can be defined as the degradation of material that results from repeated impacts of small solid particles. It occurs in a gaseous or a liquid medium containing solid particles. The present medium can change the velocity and direction of erodents (solid particles). If the erosion occurs at impact angles between 0 and 30, it is regarded as abrasive erosion, while the one occurring between 60 and 90 is called impact erosion. Depending on the material and operating parameters, erosive wear can occur with plastic deformation and/or brittle fracture. Ductile materials will undergo wear by a plastic deformation process, where the material is removed by the displacing or cutting action of the eroding particle. On the other hand, eroded brittle material will be removed by the formation and intersection of cracks that cause grain ejection. In this investigation, solid particle erosion tests were conducted to investigate the erosion wear behavior of the slip cast monolithic high purity alumina (Al 2 O 3 ) advanced ceramics at different particle impact angles at the room temperature. The erodent impact angles were 30, 60 and 90. Dry silicon carbide (SiC) was used as an erodent. Erosion mechanisms of all prepared ceramic samples were evaluated by measuring the weight loss and roughness parameters (R a, R z, R m ). Acknowledgements: This work has been fully supported by Croatian Science Foundation under the project IP : Monolithic and composite advanced ceramics for wear and corrosion protection (WECOR). 109