Sökning: "Spark Plasma Sintering"

Visar resultat 21 - 25 av 29 avhandlingar innehållade orden Spark Plasma Sintering.

1. 21. Proton Conducting Ceramics; Synthesis, Characterization and Sample Cell Environments

   Författare :FRANCIS GACHAO KINYANJUI; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perovskites; neutron diffraction; Rietveld refinements; BaSnO3; in-situ cell; deuteron position; proton conduction; BaZrO3;

   Sammanfattning : Acceptor doped Perovskite ceramics have been shown to exhibit high levels of protonic conduction in humid atmospheres. However significant grain boundary resistance and long sintering times required to achieve sufficient grain size growth has hindered their widespread application as electrolyzers, fuel cells and gas separation membranes. LÄS MER

3. 22. High Performance Fuels for Water-Cooled Reactor Systems

   Författare :Kyle D. Johnson; Janne Wallenius; James Tulenko; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nuclear fuel; accident tolerant fuel; uranium nitride; uranium silicide; Fysik; Physics;

   Sammanfattning : Investigation of nitride fuels and their properties has, for decades, been propelled on the basis of their desirable high metal densities and high thermal conductivities, both of which oer intrinsic advantages to performance, economy, and safety in fast and light water reactor systems. In this time several key obstacles have been identied as impeding the implementation of these fuels for commercial applications; namely chemical interactions with air and steam, the noted diculty in sintering of the material, and the high costs associated with the enrichment of 15N. LÄS MER

4. 23. Entropy-stabilized transition metal diborides for high-temperature applications

   Författare :Ana Carolina Feltrin; Farid Akhtar; Alberto Vomiero; Laura Silvestroni; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

   Sammanfattning : Ultra-high temperature ceramics (UHTCs) are on the cutting edge as structural or protective materials that can withstand extreme environments such as hypersonic vehicles, nuclear reactors, and advanced turbine engines. These materials stand out for their melting temperatures above 2500 °C, high chemical stability, and retained mechanical resistance at temperatures higher than 1650 °C. LÄS MER

5. 24. Engineered microstructure composites as means of improving the oxidation resistance of uranium nitride

   Författare :Yulia Mishchenko; Janne Wallenius; Denise Adorno Lopes; Jie Lian; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Physics; Fysik;

   Sammanfattning : Owing to its high uranium density and good thermophysical properties,uranium nitride (UN) fuel has been considered as a potential Accident TolerantFuel (ATF) candidate for use in Light Water Reactors (LWRs). However,the main disadvantage of UN is its low oxidation resistance in water/steamcontaining atmospheres at the operating temperatures of LWRs. LÄS MER

7. 25. Nano-EngineeredThermoelectric Materials for Waste Heat Recovery

   Författare :Mohsin Saleemi; Muhammet Toprak; Mari-Ann Einarsrud; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Energy crisis and thermal management related issues have been highlighted in the modern century due to escalating demands for energy consumption and global warming from fossil fuels. Sustainable and alternative energy sources are an ever growing global concern. LÄS MER