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## The influence of metallic components on the structure of Al2O3-Cu-Mo hybrid composites

### Agata Łukasiak

#### Abstract

The purpose of this work was to examine the influence on the mutual ratio of metallic elements on the phase structure and the basic properties of Al2O3-Cu-Mo composites materials obtained by slip casting method. At the beginning, the powders used to produce the samples were characterized by observations on the scanning electron microscope (SEM), analysis of chemical and phase composition and measurement of average particle size by laser diffraction method. The starting powders had chemical and phase composition consistent with the manufacturer's assurances. Ceramic slurries were prepared and subjected to rheological tests. In the next stage, the slurries formed as a result of mixing the components together in appropriate proportions were cast into gypsum moulds, dried in a laboratory dryer and baked at the temperature of 1400°C. In this way 7 series of samples with different contents of metallic components were produced. Rheological studies have shown that the produced slurries have the character of non-Newtonian liquid diluted with shear, the viscosity of which decreases with the increase in shear rate. Additionally, it was observed that with the increase of molybdenum content in the slips, their viscosity increases. In order to analyse the microstructure, microscopic observations were made on an optical microscope and scanning electron microscope. It turned out that the particles of the metallic phase are evenly distributed in the ceramic matrix and are characterized by irregular shape and different sizes. Microscopic observations did not show cracks or delamination on the surface between phases. For the obtained sintered samples, selected physical properties were determined and a phase analysis was carried out. The result of study based on selected physical properties shows that the apparent density and relative density values for Al2O3-Cu-Mo 20/80 decrease with increasing molybdenum content after reaching the maximum value for the composite. It was observed that the addition of 20 vol.% molybdenum causes a decrease in the absorbability and porosity of the composite, however, further increase in the content of this component increases the value of these properties. On the other hand, molybdenum content slightly influences the value of linear and volumetric shrinkage of the composite. The analysis of phase composition shows that no new phase was formed in any of the composites during the sintering process. The microhardness test showed that the addition of 20 vol.% of molybdenum to the composite causes an increase in hardness, while a further increase in the content of this component reduces the hardness achieved.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Agata Łukasiak (FMSE) Agata Łukasiak,, Faculty of Materials Science and Engineering (FMSE)
Title in Polish
Wpływ udziału komponentów metalicznych na budowę kompozytów hybrydowych Al2O3 – Cu-Mo
Supervisor
Waldemar Kaszuwara (FMSE/DCFM) Waldemar Kaszuwara,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE)
Certifying unit
Faculty of Materials Science and Engineering (FMSE)
Affiliation unit
Division of Construction and Functional Materials (FMSE/DCFM)
Study subject / specialization
, Inżynieria Materiałowa
Language
(pl) Polish
Status
Finished
Defense Date
08-02-2019
Issue date (year)
2019
Internal identifier
IM-D.002359
Reviewers
Dariusz Oleszak (FMSE/DCFM) Dariusz Oleszak,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE) Waldemar Kaszuwara (FMSE/DCFM) Waldemar Kaszuwara,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE)
Keywords in Polish
Kompozyty hybrydowe, kompozyty Al2O3-Cu-Mo, odlewanie z mas lejnych, tlenek glinu, molibden, miedź, kompozyty ceramika-metal
Keywords in English
Hybrid composites, Al2O3-Cu-Mo composites, slip casting, aluminium oxide, molybdenum, copper, ceramic-metal composites
Abstract in Polish
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Praca_inżynierska-Agata_Łukasiak-ostateczna_wersja.pdf
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Identyfikator pracy APD: 30797

Uniform Resource Identifier
https://repo.pw.edu.pl/info/bachelor/WUTf030ef1b61dc4a5688a7950e8544eb8f/
URN
urn:pw-repo:WUTf030ef1b61dc4a5688a7950e8544eb8f

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