Influence of hard ceramic particles on structure and properties of TGM

• Autorzy: Dobrzański L. A. , Dołżańska B. , Matula G.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The Powder Metallurgy route has been chosen to fabricate tool gradient materials with high disproportion of cobalt matrix portion between core and surface layer. In the paper structure and properties of TGM have been shown. Design/methodology/approach: SEM, light microscope, microhardness tests, density examination. Findings: According to carried out researches it could be stated, that forming the gradient materials with highest amount of complex carbide (W,Ti)C 90-95%, using uniaxial unilateral pressing, could be possible after adding into each layer of mixes 2 % of paraffin lubricant. High diversification of cobalt matrix ratio in comparison to hard phases in subsequent layers of gradient materials leads to their deformation in as sintered state. In case of all gradient materials, mean hardness was equal about 1600 HV1. Whereas, hardness of lower cobalt matrix rich layers brought values about 1450 HV1 and increased up to 1800 HV1 for lower layer of material rich with hard carbide phases. Practical implications: Material presented in this paper is characterized by very high hardness of the surface and relative ductility of core. TGM is a smoothly varying distribution of phases element composition. Originality/value: In the paper the manufacturing of TGM on basis of different portion of cobalt reinforced with hard ceramics particles carried out in order to improve the abrasion resistance and ductility of tool cutting materials.

Słowa kluczowe

EN

cemented carbides; tool gradient materials; powder metallurgy; sintering

PL

węgliki spiekane; materiały narzędziowe gradientowe; metalurgia proszków; spiekanie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 24, nr 2
• Strony: 95--98
• Opis fizyczny: Bibliogr. 16 poz., fot., rys., tab.

Twórcy

autor

Dobrzański L. A.

autor

Dołżańska B.

autor

Matula G.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18 a, 44-100 Gliwice, Poland,

Bibliografia

• [1] S. Luyckx, C.N. Machio, Characterization of WC-VC-Co thermal spray powders and coatings, Journal of Refractory Metals and Hard Metals 25, 1 (2007) 11-15.
• [2] G. Matula, L.A. Dobrzański, Structure and properties of FGM manufactured on the basis of HS6-5-2, Journal of Achievements in Materials and Manufacturing Engineering 17, 1-2 (2006) 101-104.
• [3] N.G. Hashe, J.H. Neethling, P.R. Berndt, H.O. Andrén, S. Norgren, A comparison of the microstructures of WC-VC-TiC-Co and WC-VC-Co cemented carbides, Journal of Refractory Metals and Hard Metals 20, 1 (2002) 51-60.
• [4] H. Saito, A. Iwabuchi, T. Shimizu, Effects of Co content and WC grain size on wear of WC cemented carbide, Wear 261 (2006) 126-132.
• [5] M. Rosso, Ceramic and metal matrix composites: Routes and properties, Journal of Materials Processing Technology 175 (2006) 364-375.
• [6] Y. Liu, H. Wang, Z. Long, P.K. Liaw, J. Yang, B. Huang, Microstructural evolution and mechanical behaviors of graded cemented carbides, Materials Science and Engineering, A 426 (2006) 346-354.
• [7] L.A. Dobrzański, A. Kloc, G. Matula, J. Domagała, J.M. Torralba, Effect of carbon concentration on structure and properties of the gradient tool materials, Journal of Achievements in Materials and Manufacturing Engineering 17, 1-2 (2006) 45-48.
• [8] W. Lengauer, K. Dreyer, Functionally Graded hardmetals, Journal of Alloys and Compounds 338 (2002) 194-212.
• [9] B. Krebach, A. Neubrand, H. Reidel, Processing techniques for functionally graded materials, Materials Science and Engineering A362 (2003) 81-105.
• [10] L.A. Dobrzański, A. Kloc-Ptaszna, A. Dybowska, G. Matula. E. Gordo, J.M. Torralba, Effect of WC concentration on structure and properties of the gradient tool materials, Journal of Achievements in Materials and Manufacturing Engineering 20, 1-2 (2007) 91-94.
• [11] J. Ma, G.E.B. Tan, Processing and characterization of metal-ceramics functionally gradient materials, Journal of Materials Processing Technology 113 (2001) 446-449.
• [12] W. Acchor, C. Zollfrank, P. Greil, Microstructure and mechanical properties of WC-Co reinforced with Nbc, Materials Research 7, 3 (2004) 445-450.
• [13] J.L. Johnson, R.M. German, Liquid Phase Sintering of Functionally Graded W-Cu Composites, 16th International Plansee Seminar, 2 (2005) 116-130.
• [14] G. Matula, L.A. Dobrzański, B. Dołżańska, Structure and properties of TGM manufactured on the basis of cobalt, Journal of Achievements in Materials and Manufacturing Engineering 20, 1-2 (2007) 151-154.
• [15] A. Kawasaki, R. Watanabe, Concept and P/M fabrication of functionally gradient materials, Ceramics International, 23 (1997) 73-83.
• [16] L.A. Dobrzański, A. Kloc, G. Matula, J.M. Torralba, Structure and properties of the gradient tool materials of unalloyed steel matrix reinforced with HS6-5-2 high-speed steel, Archives of Materials Science and Engineering, 28, 4 (2007) 197-202.