Search for dissertations about: "materials quality"

Showing result 1 - 5 of 973 swedish dissertations containing the words materials quality.

2. 1. Structural and Electronic Properties of Graphene on 4H- and 3C-SiC

   Author : Chamseddine Bouhafs; Vanya Darakchieva; Rozitsa Yakimova; Ivan Gueorguiev Ivanov; Jacek Baranowski; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Graphene is a one-atom-tick carbon layer arranged in a honeycomb lattice. Graphene was first experimentally demonstrated by Andre Geim and Konstantin Novoselov in 2004 using mechanical exfoliation of highly oriented pyrolytic graphite (exfoliated graphene flakes), for which they received the Nobel Prize in Physics in 2010. READ MORE

4. 2. Cracking during Continuous Casting of Steels : Analysis tools and procedures to identify their causes on microalloyed steel slabs

   Author : Rosa Maria Pineda Huitron; Esa Vuorinen; Pavel Ernesto Ramí­rez López; Maria Begoña Santillana; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transverse corner cracks; Continuous Casting; Microalloyes steels; Secondary cooling; Cooling curves; Crack susceptibility; Materialteknik; Engineering Materials;

   Abstract : Transverse corner cracks are one of the most common but complex defects formed in microalloyed steels during continuous casting (CC). Such cracks are detrimental because it leads to a loss in productivity with a great impact on environment, energy and economics for several steel making companies all over the world. READ MORE

5. 3. Hierarchical Structuring of Mg2Si1-xSnx Alloys for Lower Thermal Conductivity and Thermal Conductivity as Probe for Structural Characterization

   Author : Andrey Sizov; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; structural probing; Rietveld refinement; hot disc; spinodal decomposition; magnesium silicide-stannide; Microstructuring; phase separation; X-ray diffraction; thermal conductivity; thermoelectrics;

   Abstract : The thermoelectric effect was discovered nearly 200 years ago, but it started to be utilized for waste heat recovery fairly recently. From the economical point of view, such application requires a cheap and efficient material, which is able to convert heat energy into electricity. READ MORE

6. 4. Growth of Ag/Ni Thin Films and Multilayers

   Author : Per Sandström; Jørgen Bøttiger; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Fundamental studies concerning the relation between growth conditions, microstructure and internal stresses of polycrystalline Ag/Ni thin films and multilayers, as well as the relation between growth conditions and the structure of highly oriented Ni films, were performed. All films were depositied using ultra high vacuum based de magnetron sputtering. READ MORE

7. 5. ELECTRON BEAM MELTING OF ALLOY 718 - POWDER RECYCLING AND ITS EFFECT ON DEFECT FORMATION

   Author : Hans Gruber; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; powder recycling; electron beam melting; oxide defects; Alloy 718; defect formation; powder degradation; additive manufacturing; non-metallic inclusions;

   Abstract : As for any production process, the performance of additively manufactured components is ultimately dependent on the quality of the feedstock material. Consequently, for critical components, the feedstock needs to be carefully controlled to assure a stable and reliable quality. READ MORE