Page 528 - Book Hosokawa Nanoparticle Technology Handbook

APPLICATIONS 20 ELECTRICAL CONDUCTIVE CNT DISPERSED Si N CERAMICS
3 4

With CNT Without CNT

No CNTs
1.8wt%CNT
6 5 4 3 2 1 0 0 1 2 3 4
-12
3
3
-12
Wear volume (10 m ) Wear volume (10 m )
Si N disc SUJ2 ball
3 4
Figure 20.4
Wear property of CNT dispersed Si N ceramics.
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3
Consequently, electrical conductivity and superior References
mechanical properties can be achieved simultane-
ously by adding Y O –Al O –TiO –AlN to Si N . [1] C.L. Xu, B.Q. Wei, R.Z. Ma, J. Liang, X.K. Ma and
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3
3
2
2
3
2
The electroconductivity of the HIPped sample was D.H. Wu: Carbon, 37(5), 855–858 (1999).
30 S/m. Therefore, electrical property improved [2] J. Sandler, M.S.P. Shaffer, T. Prasse, W. Bauhofer,
without degradation of mechanical properties. K. Schulte and A.H. Windle: Polymer, 40(21),
Hotpressed sample had higher electrical and 5967–5971(1999).
mechanical properties than HIPped sample. These [3] G.-D. Zhan, J.D. Kuntz, J. Wan and A.K. Mukherjee:
electroconductive Si N ceramics can be applied in Nat. Mater., 2, 38–42 (2003).
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extremely severe mechanical and environmental [4] A. Peigney, C. Laurent, E. Flahaut and A. Rousset:
conditions such as ceramic bearings for high-speed, Ceram. Int., 26, 677–683 (2000).
high-temperature, high-corrosion and high-vacuum [5] Ch. Laurent, A. Peigney, O. Dumortier and
environments, and as novel functional materials
with high durability and electrical conductivity, A. Rousset: J. Eur. Ceram. Soc., 18, 2005–2013 (1998).
which result from achievement of densification at [6] J. Tatami, M. Toyama, K. Noguchi, K. Komeya,
lower temperature. Furthermore, as a result of ball- T. Meguro and M. Komatsu: Key Eng. Mater., 247,
on-disk test for wear properties, it was confirmed 83–86 (2003).
that wear volume of not only Si N itself but [7] J. Tatami, T. Katashima, K. Komeya, T. Meguro and
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also SUJ2 mating metallic material decreased T. Wakihara: J. Am. Ceram. Soc., 88, 2889–2893 (2005).
(Fig. 20.4). [8] S. Hampshire and K.H. Jack: in: Progress in Nitrogen
Si N ceramics was applied to bearing materials Ceramics, F.L. Riley (Ed.), Martinus Nijhoff, Boston,
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with longer lifetime and higher reliability to replace p. 263 (1983).
metallic materials. The developed electroconductive [9] H. Wada., M.J. Wang and T.Y. Tien: J. Am. Ceram.
Si N ceramics with high strength, toughness and
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wear resistance can restrict degradation of system Soc., 71, 837–840 (1988).
lifetime due to dust adhesion. For this reason, they are [10] Cs. Balázsi, F.S. Cinar, O. Addemir, F. Wéber and
expected to be applied as bearing materials for the P. Arató: J. Eur. Ceram. Soc., 24 (12), 3287–3294 (2004).
electronic components and so on for which the con- [11] Cs. Balázsi, Z. Kónya, F. Wéber, L.P. Biró and
ventional one cannot be used. P. Arató: Mater. Sci. Eng. C, 23, 1133–1137 (2003).
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