Search for dissertations about: "chromium"

Showing result 1 - 5 of 236 swedish dissertations containing the word chromium.

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

   Author : Ola Bergman; Chalmers University of Technology; []
   Keywords : Manganese; Prealloyed; Sintering; Mechanical properties; Chromium; Spinel oxide; Powder metallurgy; PM steel; Oxide reduction; Residual oxides; Atmosphere;

   Abstract : 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. READ MORE

4. 2. Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications

   Author : Terrance Burks; Yohannes Kiros; Arunachalanadar Madakannan; KTH; []
   Keywords : Nanomaterials; Chromium; Biology; Chemical Engineering; Kemiteknik;

   Abstract : The International Agency for Research on Cancer (IARC) stated that chromium in the form of Cr(VI) has been deemed to be a class-A human carcinogen. It has been a major contaminant associated with wastewater. READ MORE

5. 3. Studies of oxide reduction and nitrogen uptake in sintering of chromium-alloyed steel powder

   Author : Ola Bergman; John Ågren; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; powder metallurgy; chromium; pre-alloying; surface oxides; sintering; Materials science; Teknisk materialvetenskap;

   Abstract : The powder metallurgy (PM) process route is very competitive for mass production of structural steel components with complex shape, due to efficient material utilisation, low energy consumption, and short overall production time. The most commonly used alloying elements are the processing friendly metals Cu, Ni and Mo. READ MORE

6. 4. Cobalt-Chromium alloys in fixed prosthodontics

   Author : Maria Kassapidou; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; prosthodontics; cobalt-chromium; manufacturing techniques;

   Abstract : Gold and its alloys have been the dominant framework materials in metal-ceramic constructions when substantial loss of tooth substance or missing teeth needs to be replaced. However, base metal alloys, such as cobalt-chromium (Co-Cr), have been introduced due to increased gold price. READ MORE

7. 5. Microstructure of Nickel-Chromium Superalloys

   Author : Mattias Thuvander; Chalmers University of Technology; []
   Keywords : segregation; TEM; nickel alloy; grain boundary; APFIM; SIMS; carbide; precipitation; ordering; boride;

   Abstract : The microstructure of nickel-chromium superalloys has been investigated using several advanced microanalytical techniques; atom probe field ion microscopy (APFIM), transmission electron microscopy (TEM) together with energy dispersive X-ray analysis (EDX) and electron energy loss spectroscopy (EELS), secondary ion mass spectroscopy (SIMS) and optical microscopy (OM). The features primarily considered include precipitation, segregation and ordering. READ MORE