Fracture toughness of advanced alumina ceramics and alumina matrix composites used for cutting tool edges

• Autorzy: Szutkowska M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Specific characteristics in fracture toughness measurements of advanced alumina ceramics and alumina matrix composites with particular reference to α-Al₂O₃, Al₂O₃-ZrO₂, A₂O₃-ZrO₂-TiC and AI₂O₃-Ti(C,N) has been presented. Design/methodology/approach: The present study reports fracture toughness obtained by means of the conventional method and direct measurements of the Vickers crack length (DCM method) of selected tool ceramics based on alumina: pure alumina, alumina-zirconia composite with unstabilized and stabilized zirconia, alumina-zirconia composite with addition of TiC and alumina-nitride-carbide titanium composite with 2wt% of zirconia. Specimens were prepared from submicro-scale trade powders. Vicker’s hardness (HV1), fracture toughness (K_IC) at room temperature, the indentation fracture toughness, Young’s modulus and apparent density were also evaluated. The microstructure was observed by means of scanning electron microscopy (SEM). Findings: The lowest value of K_IC is revealed by pure alumina ceramics. The addition of (10 wt%) unstabilized zirconia to alumina or a small amount (5 wt%) of TiC to alumina-zirconia composite improve fracture toughness of these ceramics in comparison to alumina ceramics. Alumina ceramics and alumina-zirconia ceramics reveal the pronounced character of R-curve because of an increasing dependence on crack growth resistance with crack extension as opposed to the titanium carbide-nitride reinforced composite based on alumina. R-curve has not been observed for this composite. Practical implications: The results show the method of fracture toughness improvement of alumina tool ceramics. Originality/value: Taking into account the values of fracture toughness a rational use of existing ceramic tools should be expected.

Słowa kluczowe

EN

alumina ceramics; alumina matrix composites; fracture toughness; indentation fracture toughness; vickers hardness

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2012
• Tom: Vol. 54, nr 2
• Strony: 202--210
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Szutkowska M.

• Centre of Materials Engineering and Sintering Techniques, Institute of Advanced Manufacturing Technology, ul. Wrocławska 37a, 30-011 Kraków, Poland

Bibliografia

• [1] P. Putyra, M. Podsiadło, B. Smuk, Alumina-Ti(C,N) ceramics with TiB2 additives, Archives of Materials Science and Engineering 47/1 (2011) 27-32.
• [2] L.A. Dobrzański, M. Kremzer, A. Nagel, B. Huchler, Fabrication of ceramic preforms based on Al2O3 CL 2500 powder, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 71-74.
• [3] M. Szutkowska, B. Smuk, Kalinka, K. Czechowski, M. Bućko, M. Boniecki, Selected mechanical properties and microstructure of Al2O3-ZrO2 nanoceramic composites, Journal of Achievements in Materials and Manufacturing Engineering 48/1 (2011) 59-63.
• [4] M.D. Demetriou, M.E. Launey, G. Garrett, J. P. Schramm, D.C. Hofmann, W.L. Johnson, W. L. Johnson, R.O. Ritchie, A damage-tolerant glass, Nature Materials 10 (2011) 123-128.
• [5] F.T. da Silva, M.A.N. Zacché, H.S. de Amorim, Influence of different surface treatments on the fracture toughness of a commercial ZTA dental ceramic, Materials Res 10/1 (2007) 63-68.
• [6] M. Szutkowska, M. Boniecki, Crack Growth Resistance of Alumina Tool Ceramics, Proceedings of the World Congress on “Powder Metallurgy and Particulate Materials” PM2TEC’2002, Orlando, 6 (2002) 34-38.
• [7] K. Strecker, S. Ribeiro, M.J. Hoffman, Fracture toughness measurements of LPS-SiC: a comparison of the indentation technique and the SEVNB method, Materials Research 8/2 (2005) 121-124.
• [8] G.A. Gogotsi, Fracture toughness of ceramics and ceramic composites, Ceramic international 29 (2003) 777-784.
• [9] A. Gatto, Critical evaluation of indentation fracture toughness measurements with Vickers indenter on ceramic matrix composite tools, Materials Processing Technology 174 (2006) 67-73.
• [10] ISO 24370:2005, Fine ceramics (advanced ceramics, advanced technical ceramics) - test metod for fracture toughness of monolit hic ceramics at room temperature by chevron-notched beam (CNB) method.
• [11] ISO 18756:2003, Fine ceramics (advanced ceramics, advanced technical ceramics) - Determination of fracture toughness of monolit hic ceramics AT room temperature by the surface crack In flexure (SCF) method.
• [12] ISO 15732:2005, Fine ceramics (advanced ceramics, advanced technical ceramics) - test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method.
• [13] D. Munz , T. Fett, Ceramics, Mechanical properties, Failure behaviour, Materials selection, Springer-Verlag, Berlin Heidelberg, 1999.
• [14] M. Szutkowska, M. Boniecki, M. Bucko, R-curve behaviour of alumina matrix ceramics with long cracks, Advances in Science and Technology 45 (2006) 1652-1657.
• [15] R. Riedel, Handbook of ceramic hard materials, Wiley-VCH, 2000.
• [16] K. Niihara, R. Morena, D. Hasselman, Evaluation of KIC of brittle solid by the indentation method with low crack-to-indent ratios, Journal of Materials Science Letters 1 (1982) 13-16.
• [17] G.A. Helvey, Finishing zirconia chairside, What dental technicians need to tell their dentist clients about the effects of surface grinding, Inside dental technology 2/2 (2011) www.dentalaegis.com/idt/2011/02/finishing-zirconia-chairside.
• [18] J.F. Bartolome, A.H. De Aza, A. Martin, J.Y. Pastor, J. Llorca, R. Torrecillas, G. Bruno, Alumina/zirconia micro/nanocomposites, A new material for biomedical applications with superior sliding wear resistance, Journal of American Ceramic Society 90/10 (2007) 3177-3184.
• [19] Kee-Do Woo, Byung-Ryang Kim, Eui-Pyo Kwon, Duck-Soo Kang, In-Jin Shon, Properties and rapid consolidation of nanostructured TiC-based hard materials with various binders by a high-frequency induction heated sintering, Ceramics International 36 (2010) 351-355.
• [20] T. Fett, An analysis of the three-point bending bar by use of the weight function method, Engineering Fracture Mechanics 40/3 (1991) 683-686.