Silicides
Mostrando 1-5 de 5 artigos, teses e dissertações.
-
1. Study of Ti-7.5Si-22.5B alloys produced by powder metallurgy
Refractory alloys with silicides and borides have been used in high temperature applications because their elevated melting point, good oxidation resistance and high strength-to-weight ratio. The present study approaches the preparation of Ti-7.5Si-22.5B (at.-%) alloys through high-energy ball milling and sintering. The powders and compacts obtained in these
Mat. Res.. Publicado em: 03/06/2014
-
2. Isothermal section of the Ti-Si-B system at 1250 ° C in the Ti-TiSi2-TiB2 region
A partial isothermal section (Ti-TiSi2-TiB2 region) of the ternary Ti-Si-B system at 1250 ° C was determined from heat-treated alloys prepared via arc melting. Microstructural characterization has been carried out through scanning electron microscopy (SEM), x-ray diffraction (xRD) and wavelength dispersive spectrometry (WDS). The results have shown the stab
Mat. Res.. Publicado em: 22/10/2013
-
3. Determinação dos coeficientes de expansão térmica das fases Ta5Si3 e Cr5Si3 e a investigação da formação da fase (Hf,Ti)5Si3 por difratometria de raios X de alta resolução / Determination of the thermal expansion coefficients for the Ta5Si3 and Cr5Si3 phases and the investigation of (Hf, Ti)5Si3 phase formation by high resolution X-ray diffraction
The transition metal silicides have been investigated aiming high temperature applications. The thermal expansion is one of main properties for applications. The aim of this work was the evaluation of the thermal expansion coefficients for αTa5Si3 and Cr5Si3 phases and the investigation of (Hf, Ti)5Si3 phase formation. The Ta-Si and Cr-Si alloys were pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/10/2009
-
4. Caracterização de escorias e recuperação do silicio / Characterization of slag and recovery of the silicon
Metallurgieal Grade Silicon (MGSi) is produced by a well-established industrial process that consists of the carbo-reduction of quartz in a submerged are fumace under high temperature. The process is an intensive energy consumption method (13 - 15 kWh to each kilogram of produced MGSi). After tapered, the MGSi is submitted to some purification stages in orde
Publicado em: 2003
-
5. Space weathering on airless planetary bodies: Clues from the lunar mineral hapkeite
Physical and chemical reactions occurring as a result of the high-velocity impacts of meteorites and micrometeorites and of cosmic rays and solar-wind particles are major causes of space weathering on airless planetary bodies, such as the Moon, Mercury, and asteroids. These weathering processes are responsible for the formation of their regolith and soil. We
National Academy of Sciences.