Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31181
Properties of Al2O3 – hBN Composites

Authors: K. Broniszewski, J. Woźniak, K. Czechowski, P. Orłowski, A. Olszyna

Abstract:

Alumina matrix composites with addition of hexagonal boron nitride (hBN), acting as solid lubricant, were produced. Main purpose of solid lubricants is to dispose the necessity of using cooling lubricants in machining process. Hot pressing was used as a consolidating process for Al2O3-x%wt.hBN (x=1/ 2,5/ 5 /7,5 /10) composites. Properties of sinters such as relative density, hardness, Young-s modulus and fracture toughness were examined. Obtained samples characterize by high relative density. Hardness and fracture toughness values allow the use of alumina – hBN composites for machining steels even in hardened condition. However it was observed that high weight content of hBN can negatively influence the mechanical properties of composites.

Keywords: Machining, hexagonal boron nitride, Alumina. Composites

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1077269

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2279

References:


[1] J. Dmochowski, "Podstawy obr├│bki skrawaniem," Państwowe Wydawnictwo Naukowe, Warszawa 1981
[2] W. Grzesik, "Podstawy skrawania materiałów konstrukcyjnych," Wydawnictwo Naukowo - Techniczne, Warszawa 2010
[3] G. G├│rny, L. Sobierski, P. Rutkowski, A. Metryka, M. R─àczka, "W┼éaściwości mechaniczne i użytkowe tworzyw Al2O3 modyfikowanych heksagonalnym azotkiem boru," Spiekane materia┼éy narz─Ödziowe przeznaczone na ostrza narz─Ödzi do obr├│bki z wysokimi pr─Ödkościami skrawania, 80-91, 2010
[4] T. U─ƒurlu, M. Turko─ƒlu, "Hexagonal boron nitride as a tablet lubricant and a comparison with conventional lubricants, "International Journal of Pharmaceutics 353 (2008) 45-51
[5] M. Hub├í─ìek, M. Ueki, T. Sato, and V. Brožek, "High-Temperature behaviour of hexagonal boron nitride, " Thermochimica Acta 282/283 (1996) 359-366
[6] Y. Kimura, T. Wakabayashi, K. Okada, T. Wada, H. Nishikawa , "Boron nitride as lubricant additive," Wear 232 (1999) 199-206
[7] C.B. Ponton, R.D. Rawlings, "Vickers indentation fracture toughness test Part 1. Review of literature and formulation of standardized indentation toughness equations," Materials Science and Technology vol.5 1989