Diamond-Epoxy Composites

Abstract

Diamond filled polymeric matrix composites are an attractive issue for wear resistant tools. The performance of these composites depends on the proper association of the hard diamond particles and the soft polymeric matrix. In the present work, the tensile strength of epoxy matrix composites filled with 10, 20, and 30 wt% diamond particles was investigated. The effect of matrix deformability, by changing the epoxy monomer to hardener ratio, on the mechanical performance of the composites was also evaluated. The results showed that the strength of the composite decreases with the amount of diamond. This behavior was attributed to the development of a weak diamond/epoxy interface, as quantitatively described by the interaction parameter of the Turcsanyi model, and qualitatively corroborated by the analysis of the fracture surfaces and by the variation of tan of the composites. The best tensile behavior was obtained when the amine rich, off-stoichiometric matrix was used.

Keywords

composites diamond DMA mechanical properties epoxy

Get full access to this article

View all access options for this article.

References

Caceres, P. G. (2002). Effect of Microstructures on the Abrasive Wear Properties of Infiltrated Tungsten Alloys , Mater. Charact., 49: 1-1 .

Deuis, R. L. , Subramanian, C. and Yellup, J. M. (1996). Abrasive Wear of Aluminium Composites - A Review , Wear, 201: 132-132 .

Monteiro, S. N. , Menezes, G. W. , Rodriguez, R. J. S. , Skury, A. L. D. and Bobrovnitchii, G. S. (2004). Processing and Mechanical Behavior of Diamond Reinforced DGEBA-TETA Epoxy Matrix Composites . In: Proceedings of the PPS 2004 - Americas Regional Meeting, Florianopolis, November, p. 262-262 .

de Nograro, F. F. , Guerrero, P. , Corcuera, M. A. and Mondragon, I. (1995). Effects of Chemical Structure of Hardener on Curing Evolution and on the Dynamic Mechanical Behavior of Epoxy Resins . J. Appl. Polym. Sci., 56: 177-177 .

Meyer, F. , Sanz, G. , Eceiza, A. , Mondragon, I. and Mijovic, J. (1995). The Effect of Stoichiometry and Thermal History during Cure on Structure and Properties of Epoxy Networks . Polym., 36: 1407-1407 .

d’Almeida, J. R. M. and Monteiro, S. N. (1998). The Influence of the Amount of Hardener on the Tensile Mechanical Behavior of an Epoxy System , Polym. Adv. Technol., 9: 216-216 .

Shimbo, M. , Nishitani, N. and Takahama, T. (1984). Mechanical Properties of Acid-cured Epoxide Resins with Different Network Structures . J. Appl. Polym. Sci., 29: 1709-1709 .

d’Almeida, J. R. M. and Monteiro, S. N. (1998). The Influence of the Hardener/Resin Ratio on the Impact Behavior of an Epoxy System . J. Polym. Eng., 18: 235-235 .

d’Almeida, J. R. M. and Monteiro, S. N. (1996). Analysis of the Fracture Surface Morphology of an Epoxy System as a Function of the Resin/Hardener Ratio . J. Mat. Sci. Letters, 15: 955-955 .

10.

Skurry, A. L. , Bobrovnitchii, G. S. and Monteiro, S. N. (2004). Experimental Design Methodology Applied to Study a Diamond Purification Process . Diamond Relat. Mater., 13: 1638-1638 .

11.

Atsuta, M. and Turner, D. T. (1982). Fractography of Highly Crosslinked Polymers , J. Mat. Sci. Letters, 1: 167-167 .

12.

Turcsanyi, B. , Pukansky, B. and Tudos, F. (1988). Composition Dependence of Tensile Yield Stress in Filled Polymers , J. Mat. Sci. Letters, 7: 160-160 .

13.

d’Almeida, J. R. M. and de Carvalho, L. H. (1998). An Investigation on the Tensile Strength of Particulate Filled Polymeric Composites , J. Mater. Sci., 33: 2215-2215 .

14.

Nair, K. C. M. , Thomas, S. and Groeninckx, G. (2001). Thermal and Dynamic Mechanical Analysis of Polystyrene Composites Reinforced with Short Sisal Fibres , Comp. Sci. Technol., 61: 2519-2519 .

15.

Saha, A. , Das, S. , Bhatta, D. and Mitra, B. (1999). Study of Jute Fibre Reinforced Polyester Composites by Dynamic Mechanical Analysis , J. Appl. Polym. Sci., 71: 1505-1505 .