New materials through a variety of sintering methods

E-MRS Fall Symposium I: Solutions for Critical Raw Materials Under Extreme Conditions

Jaworska, L.^1 ; Cyboro, J.^1 ; Cygan, S.^1 ; Laszkiewicz-LUkasik, J.^1 ; Podsiadlo, M.^1 ; Novak, P.^2 ; Holovenko, Y.^3

Institute of Advanced Manufacturing Technology, Wroclawska 37A, Krakow

30-011, Poland^1

Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, Prague

16628, Czech Republic^2

Department of Mechanical Engineering, Tallinn University of Technology, Ehitajate tee 5, Tallinn

19086, Estonia^3

关键词: Conventional sintering;    Conventional sintering techniques;    Extreme conditions;    High pressure high temperature;    Manufacturing process;    Mechanical and physical properties;    Microwave sintering;    Phase composition analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/329/1/012004/pdf
DOI  :  10.1088/1757-899X/329/1/012004

来源: IOP

【 摘 要 】

New sintering techniques make it possible to obtain materials with special properties that are impossible to obtain by conventional sintering techniques. This issue is especially important for ceramic materials for application under extreme conditions. Following the tendency to limit critical materials in manufacturing processes, the use of W, Si, B, Co, Cr should be limited, also. One of the cheapest and widely available materials is aluminum oxide, which shows differences in phase composition, grain size, hardness, strain and fracture toughness of the same type of powder, sintered via various methods. In this paper the alumina was sintered using the conventional free sintering process, microwave sintering, Spark Plasma Sintering (SPS), high pressure-high temperature method (HP-HT) and High Pressure Spark Plasma Sintering (HP SPS). Phase composition analysis, by X-ray diffraction of the alumina materials sintered using various methods, was carried out. For the conventional sintering method, compacts are composed of α-Al2O3and θ-Al2O3. For compacts sintered using SPS, microwave and HP-HT methods, χ-Al2O3and γ-Al2O3phases were additionally present. Mechanical and physical properties of the obtained materials were compared between the methods of sintering. On the basis of images from scanning electron microscope quantitative analysis was performed to determine the degree of grain growth of alumina after sintering.