ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Nanocomposite formation of metal-metal oxide systems by mechanical alloying(MA) has been investigated at room temperature. The systems we chose are the Fe3O4-M(M=Al, Ti), where pure metals are used as a reducing agent. It is found that nanocompositepowders in which Al2O3 and TiO2 are dispersed in a α-Fe matrix with nano-sized grains areobtained by MA of Fe3O4 with Al and Ti for 25 and 75 hours, respectively. It is suggested thatthe shorter MA time for the nanocomposite formation in Fe3O4-Al is due to a large negativeheat associated with the chemical reduction of magnetite by aluminum. X-ray diffractionresults show that the average grain size of α-Fe in Fe-TiO2 nanocomposite powders is in therange of 30 nm. From magnetic measurement, we can also obtain indirect information aboutthe details of the solid-state reduction process during MA
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.623.pdf