Skip to main content Accessibility help
×
Home

Packing and solidification in ceramic injection moulding

  • S. Krug (a1), J. R. G. Evans (a1) and J. H. H. ter Maat (a2)

Abstract

The occupation of volume in large ceramic injection mouldings solidified under different pressures using two moulding techniques is considered. Large (60 × 45 × 25 mm) alumina injection mouldings were prepared in cavities fitted with conventional (metallic) and insulated [poly(ether ether ketone)] sprues. These provide quite distinct solidification histories which, in turn, influence the physical properties of the moulding and the extent and type of defects it contains. In the former case, the gate solidified after 26 s whereas, in the latter, the hold pressure could be applied for over 240 s. In insulated sprue moulding, the advance of the solid liquid boundary during packing and solidification was traced by fractography. Pressure was varied from 5 to 120 MPa. The interdependencies of moulding mass, apparent density, local density, polymer crystallinity, and microstructure were accounted for as a function of pressure and pressure transmission method. Changes in polymer crystallinity due to different cooling rates at different positions in the mouldings were insufficient to account for observed density differences. Systematic changes in the mass as a function of hold pressure were related to macroporosity in conventional mouldings and to microporosity in insulated sprue mouldings.

Copyright

References

Hide All
1.Evans, J.R.G., Injection Moulding, in Processing of ceramics: Materials Science and Technology Series, edited by Brook, R.J. (VCH, Weinheim, Germany, 1996), pp. 268306.
2.Reed, J.S., Principles of ceramic processing (John Wiley & Sons, New York, 1995), pp. 477489.
3.Krug, S., Evans, J.R.G., and ter Maat, J.H.H., J. Am. Ceram. Soc. 82, 2094 (1999).
4.Krug, S., Evans, J.R.G., and ter Maat, J.H.H., Proc. PIM98 (Powder Injection Moulding Technologies, Innovative Materials Solutions, PA, 1998), pp. 407414.
5.Zhang, T. and Evans, J.R.G., J. Mater. Res. 8, 187 (1993).
6.Thomas, M.S. and Evans, J.R.G., Br. Ceram. Trans. J. 87, 22 (1988).
7.Zhang, T. and Evans, J.R.G., J. Mater. Res. 8, 345 (1993).
8.Hunt, K.N. and Evans, J.R.G., J. Mater. Sci Lett. 10, 730 (1991).
9.Woodthorpe, J., Edirisinghe, M.J., and Evans, J.R.G., J. Mater. Sci 24, 1038 (1989).
10.Wright, J.K. and Evans, J.R.G., J. Mater. Sci. 26, 4897 (1991).
11.Ebenhoch, J., ter Matt, J.H.H., and Sterzel, H.J., Adv. Powder Met. Vol. 2, Powder Injection Moulding (Metal Powder Industries Fedn., Princeton, NJ, 1991), pp. 159161.
12.ter Matt, J.H.H., Ebenhoch, J., and Sterzel, H.J., Proc. 4th Int. Symp. Ceramics Materials and Components for Engines, Goteburg, Sweden (Elsevier, London, U.K., 1991), pp. 544551.
13.ter Maat, J.H.H. and Ebenhoch, J., Proc. 3rd Congr. Eur. Ceram. Soc., Madrid, Spain (Faenza Iberica, Castellon, Spain, 1993), pp. 437443.
14.Jansen, K.M.B., and Titomanlio, G., Polym. Eng. Sci. 36, 2029 (1996).
15.Wimberger-Friedl, R., Prog. Polym. Sci. 20, 369 (1995).
16.Kostic, B., Zhang, T., and Evans, J.R.G., J. Am. Ceram. Soc. 75, 2773 (1992).
17.Krug, S., Evans, J.R.G., and ter Maat, J.H.H., J. Eur. Ceram. Soc. 20, 2535 (2000).
18.Kellet, B. and Lange, F.F., J. Am. Ceram. Soc. 66, 398 (1983).
19.Wilski, H., Makromol. Chem. 150, 209 (1971).
20.Krug, S. and Evans, J.R.G., Ceram. Int. 25, 661 (1999).
21.Zhang, T. and Evans, J.R.G., J. Am. Ceram. Soc. 75, 2260 (1992).
22.Krug, S., Evans, J.R.G., and ter Maat, J.H.H. (unpublished).
23.Van Krevelen, D.W., Properties of Polymers (Elsevier, New York, 1990), pp. 603609.
24.Galeski, A. and Piorkowska, E., J. Polym. Sci., Part B: Polym. Phys. 28, 1171 (1990).
25.Galeski, A. and Piorkowska, E., J. Polym. Sci., Part B: Polym. Phys. 21, 1299 (1983).
26.Galeski, A. and Piorkowska, E., J. Polym. Sci., Part B: Polym. Phys. 21, 1313 (1983).
27.Piorkowska, E. and Galeski, A., J. Polym. Sci., Part B: Polym. Phys. 31, 1285 (1993).
28. Data Sheet Catamold AO-F BASF AG, Ludwigshafen, Germany, May 1996.

Related content

Powered by UNSILO

Packing and solidification in ceramic injection moulding

  • S. Krug (a1), J. R. G. Evans (a1) and J. H. H. ter Maat (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.