Binder Distribution in Extruded, Slip Cast, and Isostatically Pressed Green Bodies

Hajmrle, K.; Angers, R.

doi:10.1111/j.1151-2916.1977.tb15536.x

Cited by 5 publications

(1 citation statement)

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“…SEM micrographs of the slip-cast green body indicated that the 1 wt% sodium alginate binder forms a two-dimensional film at the saddle points between the particles. 18 In contrast to PEG-400, PEG-8000 is considered to act as a binder. PEG-8000 is less soluble than PEG-400 in water.…”

Section: Discussionmentioning

confidence: 99%

Slurry Chemistry Control to Produce Easily Redispersible Ceramic Powder Compacts

Moon

Grau

Cima

et al. 2000

Journal of the American Ceramic Society

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The slurry-based Three Dimensional Printing (3DP TM ) process requires the production of an easily redispersible powder bed from a well-dispersed slurry. Understanding and control of the interparticle potential in the dispersed state, as well as in the dry consolidated state, are important. The strength of the particle-particle interactions in the dry state determines the redispersion efficiency. One factor that controls the interparticle strength is the chemical stability of the ceramic powders in the dispersed state. For unstable powders, a partial dissolution and/or hydration of the powders can occur and eventually impede the redispersion by forming insoluble salt bridges at the necks of the particles. Redispersion of the powder bed can be improved substantially by weakening the strength of the particle-particle bonds. The formation of strong chemical bonds between particles should be avoided by adjusting the slurry pH to an appropriate range where the powders are chemically stable in the slurry. Replacement of the chemical bonds by soluble physical bonds, using a low-molecular-weight hydrophilic polymer, also reduces the interparticle strength and enhances redispersion.

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Section: Discussionmentioning

confidence: 99%