Synthesis of Al2O3-TiB2 Composite Powder by Planetary Milling from Al-TiO2-B2O3-Ni Mixture

Titanium diboride (TiB2), which is characterized by a high melting potin,high stiffness, good wear resistance, has good structural and thermodynamiccompatibility with Al2O3. In this paper, Al2O3-TiB2 composite ceramics wereeffectively synthesized by mechanical alloying(MA), planetary ball milling of 26.25wt.% B2O3, 30 wt.% TiO2, 33.75 wt.% Al and 10 wt.% Ni. The phase transformationafter different milling time was conducted by X-ray diffractometry(XRD). The XRDanalyses exhibited that the Al2O3-TiB2 composite was formed after 12h milling time(BPR:10/1 and rotational speed of vial: 500 rpm). The results indicate that increasingmilling time up to 60 h had no significant effect other than refining the crystallite size.