Synthesis of B4C - Nano TiB2 Composite Nano Powder by the Chemical Precipitation Method
الموضوعات :M. Saeedi Heydari 1 , H. R. Baharvandi 2
1 - Faculty of Materials and Manufacturing Processes,
Malek-Ashtar University of Technology, Tehran, Iran
2 - Faculty of Materials and Manufacturing Processes,
Malek-Ashtar University of Technology, Tehran, Iran
الکلمات المفتاحية: Nano powder, B4C-nano TiB2, Chemical precipitation, TTIP,
ملخص المقالة :
The aim of this research is to determine the proper concentration of Titanium Tetra IsoPropoxide (TTIP) and select the right temperature and time of calcinations for the synthesis of B4C-nano TiB2 composite Nano powder by the chemical precipitation method. For this purpose, first, solutions with TTIP molar concentrations of 0.1, 0.05 and 0.03 were prepared and the optimal molar concentration of TTIP was determined to be 0.05. Then, a diluted solution of distilled water and TTIP was mixed with Isopropanol Alcohol containing B4C micropowder. In this mixture, Titanium Hydroxide nanoparticles were initially synthesized and then, to convert the Ti(OH)4 to TiB2, the above mixture were calcined in a furnace, under Argon atmosphere. The calcination process was carried out at temperatures of 750, 1000 and 1250 ºC. It was observed that the most suitable temperature for the formation of the TiB2 phase is 1250 ºC and that the lower temperatures only lead to the formation of the TiO2 phase. It was also observed that, at the calcination temperature of 1250 ºC, the most appropriate time duration for the conversion of Ti(OH)4 nanoparticles to TiB2 nanoparticles is 30 minutes, during which B4C-nano TiB2 composite Nano powders form, with most of the TiB2 particle sizes being in the range of 30-60 nm.
[1] Roy, T., Subramanian, C., and Suri, A., “Pressureless Sintering of Boron Carbide”, Ceramics International, Vol. 32, No. 3, 2006, pp. 227-33.
[2] Najafi, A., Golestani-Fard, F., Rezaie, H., and Ehsani, N., “Effect of APC Addition on Precursors Properties During Synthesis of B4C Nano Powder by a Sol–Gel Process”, Journal of Alloys and Compounds, Vol. 509, No. 3, 2011, pp. 9164-70.
[3] Lee, H., Speyer, RF., “Pressureless Sintering of Boron Carbide”, Journal of the American Ceramic Society, Vol. 86, No. 9, 2003, pp. 1468-1473.
[4] Srivatsan, T., Guruprasad, G., Black, D., Radhakrishnan, R., and Sudarshan, T., “Influence of TiB2 Cntent on Microstructure and Hardness of TiB2–B4C Composite”, Powder Technology, Vol. 159, No. 3, 2005, pp. 161-167.
[5] McCuiston, R., LaSalvia, J., and Moser, B., “Effect of Carbon Additions and B4C Particle Size on the Microstructure and Properties of B4C‐TiB2 Composites”, Mechanical Properties and Performance of Engineering Ceramics and Composites III, 2007, 257.
[6] Itoh, H., Sugiura, K., and Iwahara, H., “Preparation of TiB2-B4C Composites by High Pressure Sintering”, Journal of alloys and compounds, Vol. 232, No. 1, 1996, pp. 186-191.
[7] Pérez Delgado, Y., Staia, M., Malek, O., Vleugels, J., and De Baets, P., “Friction and Wear Response of Pulsed Electric Current Sintered TiB2-B4C Ceramic Compositeˮ, Wear, 2014.
[8] Huang, S., Vanmeensel, K., Van der Biest, O., and Vleugels, J., “In Situ Synthesis and Densification of Submicrometer-Grained B4C–TiB2 Composites by Pulsed Electric Current Sintering”, Journal of the European Ceramic Society, Vol. 31, No. 4, 2011, 637-644.
[9] Itoh H, Tsunekawa Y, Tago S-i, and Iwahara H., “Synthesis and Sinterability of Composite Powder of the TiB2-B4C Systemˮ, Journal of alloys and compounds, Vol. 191, No. 2, 1993, pp. 191-195.
[10] Pierre, A. C., “Introduction to Sol-Gel Processing”, Springer, 1998.
[11] Yue, X., Zhao, S., Lü, P., Chang, Q., and Ru, H., “Synthesis and Properties of Hot Pressed B4C–TiB2 Ceramic Composite”, Materials Science and Engineering: A, Vol. 527, No. 27, 2010, pp. 7215-7219.
