Direct Ink-Jet Deposition of Ceramic Green Bodies: I - Formulation of Build Materials

Seerden, K. A. M.; Reis, Nuno; Derby, Brian; Grant, Patrick S.; Halloran, John W.; Evans, Julian

doi:10.1557/proc-542-141

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…The properties of these materials and their sources are given in Table II. Following earlier work, it was decided to use a two‐component system to disperse and stabilize the particle suspension 17,23 . This comprised a commercial polyester dispersant, Hypermer LP1, and 1‐octadecylamine; the properties and sources are again listed in Table II.…”

Section: Materials and Experimental Techniquesmentioning

confidence: 99%

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Reis

Ainsley

Derby

2005

Journal of the American Ceramic Society

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The application of ink‐jet printing technologies to direct‐write and freeform fabrication of ceramics requires the development of appropriate printing fluids. The critical parameter controlling fluid printing ability is viscosity, although surface tension and density are also important. Additionally, in piezoelectric‐driven ink‐jets, drop ejection is governed by a series of electric pulses exciting a transducer at acoustic frequencies and hence the fluid acoustic wave speed is also important. Here, suspensions of sterically stabilized fine ceramic powders in solidifying hydrocarbon systems exhibiting suitable rheology for ink‐jet printing have been formulated and their acoustic behavior has been characterized. For the particle sizes and frequencies used in this study, acoustic wave speed as a function of solids content is accurately predicted by effective medium theory. Suspensions containing up to 45% particulate by volume can be successfully passed through conventional printing heads.

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Section: Materials and Experimental Techniquesmentioning

confidence: 99%

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Reis

Ainsley

Derby

2005

Journal of the American Ceramic Society

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“…Lately, processes for making complicated ceramic parts have been developed by jetting and printing ceramic slurries at elevated temperatures. [1][2][3] An understanding of the effect of solids loading on the viscosity of the suspensions at elevated temperatures is fundamental and essential in these processes. Theories on the effect of solids loading on the viscosity at room temperature have been developed by many researchers.…”

Section: Introductionmentioning

confidence: 99%

High‐Temperature Flow Behavior of Ceramic Suspensions

Chu

Halloran

2000

Journal of the American Ceramic Society

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The objective of this study was to investigate the effects of temperature and solids loading on the viscosity of two nonaqueous ceramic suspensions. In this article, the viscosity of Al 2 O 3 suspensions with 5%-50% solids loading and hydroxyapatite suspensions with a solids loading of 5%-40% were measured at temperatures of 25°, 45°, 65°, and 75°C. The high-shear Newtonian viscosity at various temperatures was reduced to a single curve by the reduced viscosity and the temperature-adjusted solids volume fraction of the suspensions. The Krieger-Dougherty model, with the intrinsic viscosity corrected for particle geometry, was fitted to the data and was observed to provide a satisfactory description to the solids-loading-viscosity data for both suspensions.

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“…It is vital that the ceramic solid loading be high enough so that a high green density can be obtained as well as to avoid issues with excessive shrinkage and cracking, whilst ensuring viscosity remains low enough for the ink to be printable. Therefore, powder loading is usually formulated in the range 20-30 vol% [207], Fig. 13.…”

Section: Direct Inkjet Printing (Dip)mentioning

confidence: 99%