Elaboration and Characterization of the Nanometric Titanium Diboride Powders by Mechanical Milling Method

The research activities are oriented towards elaborating and characterizing nano-sized powders by powder metallurgy technologies based on wet milling in a planetary mill. For the elaboration of the TiB2 powders, a wet milling regime of initial powders was used up to nano size with the following parameters: milling technology by collision, milling times, rotational speed. The characterization of the TiB2 material will include particle size distribution analysis. EDXS and SEM analysis were used to study the structural evolution of the powder after ball milling. The mechanical milling technology, by its milling regimes, proved to be very efficient, obtaining a reduction of the titanium diboride powders particle size up to 50% compared to the initial unmilled powders.

INFLUENCE OF B4C TO TTIP MOLAR RATIO ON SYNTHESIS OF NANO TITANIUM DIBORIDE POWDERS VIA SOL-GEL METHOD

Titanium diboride ( TiB 2) has attracted great interests for its excellent mechanical properties, chemical resistance and good thermal and electrical conductivities. So it is widely applied as cutting tool composites, wear resistant parts, metal melting crucibles and electrode materials. This paper presents synthesis of nano titanium diboride powders via sol-gel method using a mixture of TTIP and B 4 C as precursors. In the hydrolysis step, B 4 C to TTIP molar ratio varied from 1.3 to 2.5. Solution samples stirred well and after aging and drying process, they were heat treated in an argon atmosphere. X-ray diffraction (XRD) patterns and Scanning electron microscopy (SEM) analysis showed that the percentage of synthesized TiB 2 increased gradually as the molar ratio of B 4 C to TTIP reached to 2.3, afterward increasing the B 4 C to TTIP molar ratio caused decreasing of titanium diboride percentage.

CHEMICAL SYNTHESIS OF NANO-TITANIUM DIBORIDE POWDERS BY BOROTHERMIC REDUCTION

Titanium diboride ( TiB 2) is one of the candidate materials for high temperature structural applications and also for control rod elements in high temperature nuclear reactors. In this paper the nano-sized titanium diboride powders were synthesized through a borothermic reduction by using TTIP and B 4 C as titanium and boron sources. Three different concentration of TTIP solutions were prepared: 0.033, 0.050 and 0.10 M. After heat treating of products between 900 to 1200°C, the scanning electron microscopy (SEM) images and X-ray diffraction patterns of powder indicated that by using the 0.10 M TTIP, the only product was TiB 2; otherwise the product was TiB 2- B 4 C composite.