Fabrication and characterization of Al2O3-TiB2 nanocomposite powder by mechanochemical processing
Tóm tắt
In order to synthesize alumina-titanium diboride nanocomposite powder, a mixture of titanium oxide, boron oxide, and aluminum powders was subjected to high-energy ball milling. The structural evaluation and the phase transformation of powder particles after different milling times were studied by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results showed that only after 2 h of milling the Al/TiO/B2O3 reacted with a self-sustaining mode and an alumina-titanium diboride nanocomposite powder was formed. As far as we know, the fabrication of Al2O3-TiB2 composite powder using a mechanochemical processing Al, TiO, and boron oxide as starting materials has not yet been studied, and also, milling was carried out for very long times to synthesize this powder. When similar studies on the subject are examined, in our study, TiO is used instead of TiO2 as a titanium source, in synthesizing Al2O3-TiB2 in situ nanocomposite powder. The critical benefit is that the replacement of elementary reagents by compounds usually leads to the formation of a structure with finer particles and requires a shorter milling time for the powder synthesis. In the final stage of milling, the crystallite size of alumina and titanium diboride was calculated to be less than 20 nm. The minimum particle size obtained in the particle size analysis was calculated as 0.0157 μm (15.7 nm). In FT-IR analyses, the peaks of Al-O bonds were between 409.16 and 673.91 cm−1 and that of Ti-B bonds were 739.03 and 740.45. It was determined to have 1017.9 and 1025.01 cm−1 peak values. The results showed that increasing the milling time up to 4 h has no significant effect other than reducing the crystallite size.
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