Sökning: "Spinel"

Visar resultat 11 - 15 av 78 avhandlingar innehållade ordet Spinel.

1. 11. Key Aspects of Sintering Powder Metallurgy Steel Prealloyed with Chromium and Manganese

   Författare :Ola Bergman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manganese; Prealloyed; Sintering; Mechanical properties; Chromium; Spinel oxide; Powder metallurgy; PM steel; Oxide reduction; Residual oxides; Atmosphere;

   Sammanfattning : The powder metallurgy (PM) process is a cost efficient near net-shape technology suitable for sustainable manufacturing of structural steel components. A drawback with the PM technology is the difficulty to use oxidation sensitive alloying elements, such as Cr and Mn. LÄS MER

3. 12. Anion redox processes in novel battery cathode materials investigated by soft X-ray spectroscopy

   Författare :Felix Massel; Laurent Duda; Håkan Rensmo; Maria Hahlin; Kevin Smith; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; soft X-ray spectroscopy; X-ray absorption spectroscopy XAS ; resonant inelastic X-ray scattering RIXS ; lithium-ion battery LIB ; sodium-ion battery SIB ; anionic redox; cathode materials; layered manganese oxide; spinel LNMO;

   Sammanfattning : This thesis presents experimental investigations of the electronic structure of emerging and novel cathode materials used in lithium- and sodium-ion batteries. The investigated materials include a range of oxide materials containing the elements nickel and manganese. LÄS MER

4. 13. Three Dimensional Determinations of Inclusions in Ferroalloys and Steel Samples

   Författare :Yanyan Bi; Andrey Karasev; Chris Pistorius; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Three dimensional; Ferroalloy; Inclusion; Spinel inclusion; T hermodynamic calculation; REM clusters; Formation mechanism; Statistical analysis; Maximum size;

   Sammanfattning : As the requirements on material properties increase, there has been a demand on an additional knowledge on the effect of impurities in the ferroalloyson the steel cleanness. Thus, the number, morphology, size and composition of inclusions in sixdifferent ferroalloys (FeTi, FeNb, FeSi,SiMn, LC and HC FeCr) were investigatedin this study. LÄS MER

5. 14. Surface Characteristics of Water Atomized Pre-alloyed Steel Powders and their effect on Sintering

   Författare :Dimitris Chasoglou; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spinel oxides; sintering; Cr-pre-alloyed powder; reduction; sintering atmosphere; surface oxide; fractography; XPS; oxidation; AES; EDX; carbothermal reaction; SEM; Powder metallurgy;

   Sammanfattning : Powder Metallurgy (PM) is an efficient method, in terms of cost and raw material utilization, for the production of structural parts that have strict dimensional tolerances and complex geometries. In the common processing route, steel powder is fabricated by water atomization and then pressed and sintered into the final component. LÄS MER

7. 15. Parameters influencing inclusion compositions in Al-killed steel melts during a secondary refining process

   Författare :Takanori Yoshioka; Andrey Karasev; Pär Jönsson; Joohyun Park; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-metallic inclusion; ladle furnace; RH; thermodynamics; contact angle; Al2O3; MgO•Al2O3 spinel; calcium aluminate; CaS.;

   Sammanfattning :      This study was carried out to clarify the factors influencing the evolution of inclusions in Al-killed steel melts during a secondary refining process. First, a case-hardening steel was the subject of study to understand the factors influencing the inclusion compositions in the steel melt. LÄS MER