Essays about: "spinell"

Showing result 1 - 5 of 6 essays containing the word spinell.

1. 1. Nitrogen Without Oxygen : The effect of ferroalloys added after vacuum treatment on cleanliness of nitrogen-alloyed tool steel

   University essay from KTH/Materialvetenskap

   Author : Leo Nilsson Hultén; [2021]
   Keywords : Tool steel; Electro-Slag Remelting ESR; Nitrogen Alloying; Ferroalloys; Nonmetallic Inclusions NMI; Verktygsstål; Elektroslaggomsmältning ESR; Kvävelegering; Ferrolegeringar; Ickemetalliska Inneslutningar NMI;

   Abstract : Nitrogen-alloyed tool steel is made at Uddeholms AB by adding high-nitrogen ferroalloy after vacuum degassing where introduced impurities are hard to remove. In this thesis two types of high-nitrogen ferrochromium are compared, a solid version and a powder cored wire. READ MORE

3. 2. Development of Novel (Cu,Fe)3O4 Coatings for AISI 441 Solid Oxide Cell Interconnects : Coating optimization and long-term study

   University essay from KTH/Materialvetenskap

   Author : Line Larby; [2020]
   Keywords : SOC; SOFC; interconnect; Cr evaporation; Cu-Fe coatings; spinel; SOFC; SOC; interkonnektor; bipolär platta; Cr-förångning; Cu-Fe-beläggningar; spinell;

   Abstract : As current environmental challenges are gaining increased attention, development of clean energy solutions is becoming one of the essential strategies to keep within the boundaries of established environmental policies. Solid oxide cell (SOC) technology can provide clean energy conversion and storage when hydrogen is the energy carrier. READ MORE

4. 3. Cr-spinels in the Franklinian Mobile Belt : a geochemical record of Paleozoic tectonics

   University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

   Author : Malvina Forbes Halldén; [2019]
   Keywords : geology; geochemistry; spinel; Cr-spinel; chromite; SEM; scanning electron microscope; electron microprobe; EMP; electron probe microanalyzer; EPMA; electron micro probe analyzer; EMPA; petrogenetic indicator; microscopy; alteration; Franklinian Mobile Belt; Kulutingwak Formation; Clements Markham fold belt; Pearya; Paleozoic; suprasubduction zone; SSZ; island arc; IA; Arctic Canadian Archipelago; Ellesmere Island; Canada; 2017 Circum-Arctic Structural Events Expedition 19; Memorial University of Newfoundland; geologi; geokemi; spinell; Cr-spinell; kromit; SEM; svepeletronmikroskopi; elektronmikrosondanalys; EMP; EPMA; EMPA; petrogenetisk indikator; mikroskopi; Franklinian Mobile Belt; Kulutingwak-formationen; Clements Markham fold belt; Pearya; Paleozoikum; suprasubduktionszon; SSZ; öbåge; IA; Kanadas arktiska öar; Ellesmereön; Kanada; 2017 Circum-Arctic Structural Events Expedition 19; Memorial University of Newfoundland;

   Abstract : The chemical compositions of Cr-spinel extracted from mafic and ultramafic rocks collected on Ellesmere Island in the Arctic Canadian Archipelago were obtained through electron microprobe analyses. The extensively altered rocks are sampled from rock units in the Franklinian MobileBelt, which is representative of a Paleozoic tectonically active oceanic regime of which little is presently known. READ MORE

5. 4. When did the Kalahari craton form? : constraints from baddeleyite U-Pb geochronology and geo-chemistry of mafic intrusions in the Kaapvaal and Zimbabwe cratons

   University essay from Lunds universitet/Geologiska institutionen

   Author : Nadine März; [2010]
   Keywords : geography; geology; Kalahari craton; baddeylite U-Pb geochronology; mafic intrusions; Kaapvaal craton; Zimbabwe craton; Earth and Environmental Sciences;

   Abstract : Nordost om Bushveldkomplexen i Kaapvaal kratonen finns en mäktig gångsvärm av nordost-orienterade diabasgångar tillhörande ”the Black Hills dyke swarm”. Med hjälp av U- Pb metoden av mineral baddeleyit daterades fem gångar inom ålderspannet 1.87 - 1.85 Ga, där två av dem ger exakta åldrar på 1852 ± 5 Ma och 1863 ± 7 Ma. READ MORE

6. 5. A geochemical characterization of the lower part of the Miocene shield-building lavas on Gran Canaria

   University essay from Lunds universitet/Geologiska institutionen

   Author : Romina Peetz; [2009]
   Keywords : Gran Canaria; shield-building lavas; Güigüi Formation; Earth and Environmental Sciences;

   Abstract : Ocean islands offer a great potential to provide information about mantle processes and the composition of the mantle. Gran Canaria is located in the centre of the Canary Island Archipelago and is well suited for such studies. A comprehensive study of the lower Miocene shield-building lavas is performed for this thesis. READ MORE