Calculation of Tape Thickness for Ceramic Tape Casting

Abstract:

Tape casting play a significant role in industrial area, such as multilayered ceramic (MLC) packages, functionally graded materials (FGM), low temperature co-fired ceramics (LTCC) and so on. For the complexity of the rheology for slurry during tape casing process, the control of tape thickness by experience was unstable. Although few numerical and analytical studies on predicting the tape thickness have been done, but these efforts have focused on Newtonian, Bingham, Power law, respectively. There is no unified equation to calculate the tape thickness among different rheological models. In this paper, the calculation results are characterized by wide adaptability; the blade gap, the casting speed and the slurry rheological property are incorporated into calculation; the effect of parameters in the result is studied; Parameter P_nd can be used as a guide to check which mark patterns of the flow velocity profiles in the channel. The results proposed and the experimental measurements from existing publications are in close agreement. Compared with the prediction of the existing models, the calculation results proposed has good agreement with them.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 328-333
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.328
• Online since: June 2012
• Authors: Shu Long Liu, Qiang Shen, Guo Qiang Luo, Mei Juan Li, Lian Meng Zhang
• Keywords: Tape Casting, Tape Thickness, Wide Adaptability

References

[1] R.E. Mistler, Tape casting: the basis process for meeting the needs of the electronic industry, Am. Ceram. Soc. Bull. 69 (1990) 1022-1026.

[2] D Hind, P.R Knott, Aqueous and sol–gel synthesis of sub micron PZT materials and development of tape casting systems for multi-layer actuator fabrication, Br. Ceram. Proc. 52 (1994) 107-119..

[3] G.O. Dayton, W.A. Schulze, T.R. Shrout, S. Swartz and J.V. Biggers, Fabrication of electromechanical transducer materials by tape casting, J.A. Mangels, G.L. Messing, Editors Advances in Ceramics. 9 (1984) 115-139.

[4] L.W. Tai, P.A. Lessing, Tape Casting and Sintering of Strontium-Doped Lanthanum Chromite for a Planar Solid Oxide Fuel Cell Bipolar Plate, J. Am. Ceram. Soc. 74 1 (1991) 155-160.

DOI: 10.1111/j.1151-2916.1991.tb07311.x

[5] T.A. Ring, A Model of Tape Casting Bingham Plastic and Newtonian Fluids, Adv. Ceram. 26 (1989) 569-576.

[6] Y.T. Chou, Y.T. Ko and M.F. Yan, Fluid Flow Model for Ceramic Tape Casting, J. Am. Ceram. Soc. 70 (1987) 280-282.

DOI: 10.1111/j.1151-2916.1987.tb04900.x

[7] X.Y. Huang, C.Y. Liu and H.Q. Gong, A viscoplastic flow modeling of ceramic tape casting, Material and Manufacturing Processes. 12 (1997) 935-944.

DOI: 10.1080/10426919708935195

[8] S.C. Joshi, Y.C. Lam, F.Y.C. Boey and A.I.Y. Tok, Power Law Fluids and Bingham Plastics Flow Models for Ceramic Tape Casting, Materials Processing Technology. 120 (2002) 215-225.

DOI: 10.1016/s0924-0136(01)01065-2

[9] H.J. Kim, M.J.M. Krane, K.P. Trumble and K.J. Bowman, Analytical Fluid Flow Models for Tape Casting, J. Am. Ceram. Soc. 89 (2006) 2769-2775.

DOI: 10.1111/j.1551-2916.2006.01163.x

[10] A.I.Y. Tok, F.Y.C. Boey and Y.C. Lam, Non-Newtonian fluid flow model for ceramic tape casting, Materials Science and Engineering. A280 (2000) 282-288.

DOI: 10.1016/s0921-5093(99)00691-7

[11] G.N. Zhang, Y.G. Wang and J.S. Ma, Bingham plastic fluid flow model for ceramic tape casting, Materials Science and Engineering. A337 (2002) 274-280. Appendix: Glossary of Terms Alphabet letters C Integration constant g gracitstional acceleration h height H height of slurry depth K apparent viscosity L height of the fluid behind the rear doctor blade n measure of the deviation from a Newtonian fluid P presure W wide of rear doctor blade u velocity U velocity of belt Q slurry flow rate x, y cartesian coordinates Greek letters ς yield stress τ shear stress α the orrection factor for side flow δ tape thickness β the orrection factor for weight loss ρ density Subscripts nd dimensionless variable descriptors pl plug flow im imaginary variable descriptors max maximum s slurry tp dry tape 1,2 numeric variable descriptors

DOI: 10.1016/s0921-5093(02)00043-6