Effect of Copper Content on the Microstructures and Properties of TiB2 Based Cermets by SHS

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TiB2 based cermets with different copper content were produced from titanium powder, boron powder and copper powder by Self-propagating High-temperature Synthesis under conditions of Pseudo Hot Isostatic Pressing (SHS/PHIP). In order to obtain the optimal copper content, the effect of copper content on the microstructures and properties of TiB2 based cermets was investigated. The size of the TiB2 particles in the products decreased with increasing amounts of copper. The hardness (HRA) and bend strength increased firstly, then decreased with copper increasing. Their maximum values appeared at 20 wt.% and 40 wt.% copper, respectively. The porosity of TiB2 based cermets decreased with the copper content increasing due to good fluidity of copper. With the addition of copper, the fracture toughness of TiB2 based cermets increased gradually. Crack-tip plastic blunting by a ductile metallic phase and crack deflection are the principal mechanisms of toughness improvement of TiB2 based cermets. The range of optimal copper content in the TiB2 based cermets is between 40 wt.% and 50 wt.%.

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Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

1619-1622

Citation:

Q. Xu et al., "Effect of Copper Content on the Microstructures and Properties of TiB2 Based Cermets by SHS", Materials Science Forum, Vols. 475-479, pp. 1619-1622, 2005

Online since:

January 2005

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$38.00

[1] L. Lu, M. O. Lai and H. Y. Wang. Synthesis of Titanium Diboride TiB2 and Ti-Al-B Metal Matrix Composites. J. Mater. Sci. Vol. 35 (2000), p.241.

[2] L. S. Sigl and K. A. Schwetz. TiB2-Based Cemented Borides: a New Generation of Hardmetals. Powd. Metall. Int. Vol. 23 (1991), p.221.

[3] B. Yuriditsky. TiB2-Based Cermets. Refractory Metals & Hard Materials Vol. 9 (1990), p.32.

[4] J. M. Sánchez, I. Azcona and F. Castro. Mechanical Properties of Titanium Diboride Based Cermets. J. Mater. Sci. Vol. 35 (2000), p.9.

[5] Z. Y. Ma and S. C. Tjong. High temperature creep behavior of in-situ TiB2 particulate reinforced copper-based composite. Mater. Sci. & Eng. A Vol. 284 (2000), p.70.

DOI: https://doi.org/10.1016/s0921-5093(00)00797-8

[6] R.J. Li. Ceramic-Metal composites (Metallurgic Industry Press, Beijing 1995).

[7] W. D. Kingery, H. K. Bowen and D. R. Uhlman. Introduction to Ceramics. (John Wiley & Sons, Int. New York 1976).

[8] K. Hirano. Toughening mechanism for ceramics by a ductile metallic phase. J. Mater. Sci. Letters Vol. 13 (1994), p.1219.