Sliding wear behavior of Al2O3-NbC composites obtained by conventional and nonconventional techniques

[EN] This study aims to investigate the dry sliding wear behavior of Al2O3 5vol.%NbC nanocomposite sintered by conventional and spark plasma sintering at temperatures from 1450 to 1600 ºC. The tests were performed using WC 6 wt%Co balls as a counterpart material, a load of 30 and 60 N, a sliding distance of 2000 m and a sliding speed of 0.1 m/s. The consolidation techniques influenced the friction coefficient, wear rates and patterns. Samples tested at 30 N showed better wear resistance than the samples tests with 60 N. The nanocomposites obtained by SPS at 1500 ºC exhibited a lower friction coefficient and wear rate compared to all other materials. The results indicated that Al2O3-NbC nanocomposites show promise as material for cutting tool applications.This work has been financial support by the Brazilian institution CAPES for the project CAPES-PVE A086/2013 (project No 23038.009604/2013-12). A. Borrell acknowledges the Spanish Ministry of Economy and Competitiveness for her Juan de la Cierva-Incorporacion contract (IJCI-2014-19839).Ribeiro-Rodrigues Alecrim, L.; Ferreira, J.; Gutierrez-Gonzalez, C.; Salvador Moya, MD.; Borrell Tomás, MA.; Pallone, E. (2017). Sliding wear behavior of Al2O3-NbC composites obtained by conventional and nonconventional techniques. Tribology International. 110:216-221. https://doi.org/10.1016/j.triboint.2017.02.028S21622111

Obtaining And Characterization Of The Alumina-zirconia Nanocomposite

Ceramics of alumina of high density and purity can have a broad application area due to the combination of the excellent properties such as resistance to corrosion, good biocompatibility, and high resistance to wear and moderate mechanical resistance. But its low fracture toughness limits its range of applications. One possibility of improvement in the properties of these materials might be in the use of nanometric inclusions of ZrO2 into the matrix of Al2O3. The aim of this paper was to obtain and characterize the nanocomposites of alumina containing 0, 5, 10, 15 and 30 vol% of nanometric zirconium, seeking improvements in the mechanical properties and its comparison with values found for the matrix without the inclusion. For that, nanometric particles of ZrO2 were added into the matrix of alumina in the different proportions, using mixture of suspensions. The samples of alumina and nanocomposites of alumina-zirconium were physically, microstructurally and mechanically characterized. The results obtained, showed the efficiency of the used process, obtaining a good dispersion of the particles of zirconium in the matrix of alumina. The adding of up to 15vol% nanometric zirconium in the matrix of alumina promoted an increase in the values of the mechanical properties when compared with alumina. For the nanocomposites containing 30vol%, a good dispersion of the zirconium inclusions did not happen, leading to inferior values in the measured properties. © 2012 Materials Research Society.13863137Guimarães, F.A.T., Silva, K.L., Trombini, V., Pierre, J., Rodrigues, J.A., Tomasi, R., Pallone, E.M.J.A., (2009) Ceramics International, 35, pp. 741-745Liu, G.J., Qui, H.B., Tood, R., Brook, R.J., Guiuo, J.K., (1998) Materials Research Bulletin, 33 (2), pp. 281-288Nakahira, A., Niihara, K., (1992) J. Ceram. Soc. Jpn., 100, pp. 448-453Niihara, K.N., Nakahira, A., Sasaki, G., Hirabayashi, M., (1989) Materials Resarch Society, 4, pp. 129-134. , JapanNiihara, K., (1991) J. Ceram. Soc. Jpn, 99 (10), pp. 974-982Jeong, Y.K., Nakahira, A., Morgan, P.E.D., Niihara, K., (1997) J. Am. Ceram. Soc., 80, pp. 1307-1309Jeong, Y.K., Niihara, K., (1997) Nanostructured Materials, 9, pp. 193-196Zhao, J., Stearns, L.C., Harmer, M.P., Chan, H.M., Meiler, G.A., Cook, R.C., (1993) J. Am. Ceram. Soc, 76 (2), pp. 503-510Hahan, H., Padmanabhan, K.A., (1995) Nanostructured Materials, 6, pp. 191-200Davidge, R.W., Brook, R.J., Cambier, F., Poortman, M., Leriche, A., O'Sullivan, D., Hampshire, S., Kennedy, T., (1997) Br. Ceram. Trans., 96, pp. 121-127Carroll, L., Sternitzke, M., Derby, B., (1996) Acta Mater., 44, pp. 4543-4552Brook, R.J., Mackenzie, R.A.D., (1993) Composite Materials, pp. 27-30Anya, C.C.A., (2000) Ceramic International, 26, pp. 427-434Ferroni, L.P., Pezzotti, G., (2002) J. Am. Ceram. Soc, 85 (8), pp. 2033-2038Chinelatto, A.S.A., Manosso, M.K., Pallone, E.M.J.A., Souza, A.M., Chinelatto, A.L., (2010) Advances in Science and Technology, 62, pp. 221-22