Studies on rheology of ceramic inks and spread of ink droplets for direct ceramic ink jet printing

Prasad, P.S.R. Krishna; Reddy, A. Venumadhav; Rajesh, P.K.; Ponnambalam, P.; Prakasan, K.

doi:10.1016/j.jmatprotec.2006.04.001

Cited by 47 publications

(24 citation statements)

References 17 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3, the main stages of formation of ceramic ink drop were observed which includesd ejection, stretching of liquid (1-3), contraction of liquid thread (4-5), breakup of thread into the primary drop (6), and satellite formation by pinch-off of liquid thread from nozzle exit (7)(8)(9)(10). Satellite formation occurs because of the break of liquid thread.…”

Section: Results and Discussion 51 Drop Formationmentioning

confidence: 99%

Dynamic Characteristics of Drop-substrate Interactions in Direct Ceramic Ink-jet Printing using High Speed Imaging System

Somasundaram¹,

Kanagaraj²,

Prakasan³

2009

DSJ

View full text Add to dashboard Cite

(DCIJP). The DCIJP finds applications in the fabrication of complex-shaped monolithic ceramic parts, ceramic composites, solid-oxide fuel cells, integrated circuits, components of fuel cells, gas turbines, ceramic tiles used in space vehicles, and many other equipments operating at high temperature owing to their ability to retain strength at high temperature. Ceramic pottery industry can also benefit from this process.The DCIJP uses ceramic powder presented in a carrier medium which is deposited using a delivery system actuated by a piezoelectric device. A mathematical model for droplet formation from orifice and its deposition on substrate in DCIJP has been developed by Vijay and Prakasan 6 . The success of this process depends on the systematic preparation of ceramic inks, droplet formation in the print head, and droplet deposition on the substrate. It can be used to fabricate larger parts like ceramic tiles for aerospace vehicles ABSTRACTSolid freeform fabrication has the potential to construct ceramic parts, directly from computer aided design (CAD) data, without a mould or a die by the addition of material. Direct ceramic ink-jet printing is one of the techniques used in freeform fabrication. Ceramic tiles used in space vehicles can be produced by this method wherein a porous ceramic substrate (Al 2 O 3 /SiC) can be filled with a ceramic ink and processed subsequently. The success of this process depends on the systematic preparation of ceramic inks and the deposition of the ceramic ink on the substrate. In this paper, photographic studies were made on the characteristics of ceramic ink droplets when these are deposited on a porous ceramic substrate from a burette under gravity. For this investigation, ceramic inks were prepared using different amounts (0.253.0 vol. %) of an organic dispersant (oleic acid) added to a ceramic composition containing different amounts: (a) (7.5 17.5 vol. %) of alumina and (b) (7.515.0 vol. %) of zirconia with ethyl alcohol as a carrier. From this study, the drop formation, sedimentation in the drop, spread of drop on the substrate, splashing of drop impinging a previous ceramic ink layer on the substrate, and merging of droplets after deposition, are observed. This method is useful for manufacturing of parts with ceramic fibres filled with ceramic particles and this study can provide inner details on the behaviour of ink drops.

show abstract

Section: Results and Discussion 51 Drop Formationmentioning

confidence: 99%

Dynamic Characteristics of Drop-substrate Interactions in Direct Ceramic Ink-jet Printing using High Speed Imaging System

Somasundaram¹,

Kanagaraj²,

Prakasan³

2009

DSJ

View full text Add to dashboard Cite

show abstract

“…Discussed solvent systems include water [15,7,19,13], octane, hexene or isopropyl alcohol [17], ethyl alcohol [11,9,10] or water/glycerol mixtures [12]. Reverse microemulsions are also reported to be adequate solvents systems [20].…”

Section: Introductionmentioning

confidence: 99%

“…Reverse microemulsions are also reported to be adequate solvents systems [20]. Rheological studies of different ceramic inks for DCIJP document as well Newtonian behaviour [15] as shear-thinning characteristics [9] for inks containing similar solid loadings but different solvent systems. In piezoelectric print heads, the propagating pressure wave introduces increasing strong shear forces in the ink causing material flow and finally drop ejection.…”

Section: Introductionmentioning

confidence: 99%

Highly loaded alumina inks for use in a piezoelectric print head

Polsakiewicz¹,

Kollenberg

2011

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Ink jet printing techniques are used for an increasing number of materials and applications. Properties of the used inks have great influence on process stability and accuracy as well as the resulting part properties. Inks containing ceramic particles have been applied in various studies and applications. The criteria identifying suitable inks vary depending on the applied printing technology. In this study, inks for application in a piezoelectric print head were investigated. Alumina inks with solid loadings up to 21 vol.-% were prepared and characterized. The Influence of different solid loadings, dispersant concentrations and binding agents was examined. The prepared inks show sufficient stability and fit literature recommendations for successful drop ejection. Considering rheological aspects, two inks with light shear-thinning behaviour and viscosities of 18 mPas and 23 mPas at high shear rates were recommended for upcoming printing tests. The Re/We 1/2 ratio can be used for predetermination of print ability but the influence of the surface tension is not sufficiently taken into account using the presented calculations. So further printing experiments are essential for clarification of the calculations and obtained print ability values. Keywords: Suspension / particle processing / materials processing / rheology / alumina /

show abstract

“…The quality of the printed micropatterns is determined by ink composition, droplet formation/release behavior at the nozzle, and drop impaction/nucleation on the substrate, which are all fundamentally correlated with rheological and kinematic properties of the ink. [4][5][6][7][8][9][10] Ideally, the droplet, upon being ejected from the nozzle, should retain integrity during transit as well as after impaction with the print surface. To achieve this, the fluid mechanics of the jetting and droplet formation process must be well understood and controlled.…”

mentioning

confidence: 99%

“…A narrow ink composition range was formulated which used an organic solvent (α-terpineol), low-content ceramic solids (La 0.6 Sr 0.4 Fe 0 . 8 Co 0.2 O 3 or LSFC) and/or a dispersant/binder (polymeric ethyl cellulose or EC). The manipulation of key parameters for tuning ink rheological properties and droplet velocity, i.e.…”

mentioning

confidence: 99%

Controlling Inkjet Fluid Kinematics to Achieve SOFC Cathode Micropatterns

Hill

Reitz

Rottmayer

et al. 2015

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

Drop-on-demand inkjet printing -a mask-less, fine write, and high throughput technique -is attractive for fabricating miniature ceramic devices. In this study, high quality, fine-featured solid oxide fuel cell (SOFC) cathode micropatterns were demonstrated using inkjet printing. The influence of the droplet kinematic properties on final drop deposition was studied by adjusting ink temperature and droplet velocity to obtain a wide range of Weber and Z values, i.e. 0 < Weber < 57 and 0 < Z < 24. Terpineol-based inks were evaluated, with or without dispersant (polymeric ethyl cellulose) and/or active cathode material (La 0.6 Sr 0.4 Fe 0 . 8 Co 0.2 O 3 ). The balance of inertia to the surface energy of the jetted droplet was found to play a prominent role in the stability of droplets. The Weber number was found to be the good predictor for stable jetting. At Weber > 35 printing defects from splashes and satellites were present. At Weber < 35 the droplets coalesced into uniform, round circles without splashes or satellite defects. Defect-free printing was essential toward achieving uniform micropatterens such as micro dot arrays or micro lines which are on the scale of 100 microns or less.

show abstract

Studies on rheology of ceramic inks and spread of ink droplets for direct ceramic ink jet printing

Cited by 47 publications

References 17 publications

Dynamic Characteristics of Drop-substrate Interactions in Direct Ceramic Ink-jet Printing using High Speed Imaging System

Dynamic Characteristics of Drop-substrate Interactions in Direct Ceramic Ink-jet Printing using High Speed Imaging System

Highly loaded alumina inks for use in a piezoelectric print head

Controlling Inkjet Fluid Kinematics to Achieve SOFC Cathode Micropatterns

Contact Info

Product

Resources

About