Metals and Ceramics Division - Oak Ridge National Laboratory

Table 1. Electrical Power Inputs for EPD in different suspension solvents.
Mixing ratio
ethanol (vol. %)/acac (vol. %)
Input electrical power
Constant Current Mode
(mW/cm 2 Constant Voltage Mode
)
(mW/cm 2 )
0/100 61.2 1.5
15/85 17.7 5.5
30/70 16.2 6.1
45/55 12.1 8.5
60/40 7.5 12.5
75/25 5.7 17.5
90/10 5.3 17.2
100/0 9.1 11.1
Figure 3. Micro graphs of the dried green forms deposited on stainless steel substrates at a
constant voltage of 50 V for 120 s. The depositions were conducted in the suspensions of 5g/l
YSZ in solvents of (a) pure acac, (b) 45vol% ethanol /55vol% acac, and (c) pure ethanol for
120 s.
Conclusions
The EPD behaviors in the suspension with acac and ethanol at different ratios were investigated.
Even through depositions can be achieved in any of the mixing compositions, microstructure
suggested that deposits obtained in the suspensions with ratio of ethanol to acac at about 1:1
outcome homogeneously packed green form that may form dense coatings after sintering.
References
1. P. Sarkar, X. Huang, and P. Nicholson, J. Am. Ceram. Soc., 76, 1055 (1993).
2. P.S. Nicholson, P. Sarkar, and X. Haung, J. Mater. Sci, 28, 6274 (1993).
3. C.E. Baumgartner, V.J. Decarlo, P.G. Glugla, and J. Grimaldi, J. Electrochem. Soc. 132, 57
(1985).
4. C.T. Chu and B. Dunn, Appl. Phys. Lett., 55, 492-94(1993).
5. Y. Yuan, X. Wang, and P. Xiao, J. Euro. Ceram. Soc., 24, 2233 (2004).
6. H. Negishi, K. Yamaji, N. Sakai, T. Horita, H. Yanagishita and H. Yokokawa, J. Mater. Sci,
39, 833 (2004).
7. Z. Wang, J. Shemilt, and P. Xiao, J. Euro. Ceram. Soc. 22, (2002).
8. M. Naigai, K. Yamashita, T. Umegaki, and Y. Takuma, J. Am. Ceram. Soc., 76, 253 (1993).
9. R. Louh, Y. Hsu, Mater. Chem. Phy. 79, 226 (2003).