Speaker
Description
The electronics industry is seeking the low-waste, low-energy, cost-effective manufacturing process for miniaturised components, often in the form of thick-film structures on various substrates. A promising route to such components is a printing technology that involves a layer-by-layer deposition of a suspension followed by a post-deposition curing of the as-deposited layers. This contribution will discuss the piezoelectric inkjet printing of an aqueous suspension of Pb(Zr0.53Ti0.47)0.98Nb0.02O3 with 6 mol % excess of PbO nano-sized powders, the mechanisms by which nano-sized powders and the PbO excess determine the sintering of the thick films on a rigid alumina substrate and the functional response of the inkjet-printing-derived thick film.
We will systematically describe the procedures for the ink preparation and relate the processing steps to the properties of the ink, namely particle size, zeta potential and surface tension. Optimization of printing conditions include different waveforms and the effects of voltage and waveform duration on printed pattern. The optimised ink properties and jetting parameters resulted in well defined, defect free pattern on metallised alumina substrate.
The inkjet-printed films were heated to 400 oC to remove the organics and subsequently sintered at 750 and 850 oC. The correlations between the density, grain size and electromechanical properties of the thick films will be qualitatively discussed. A thickness coupling factor of 46 % was obtained for a 15-µm-thick film sintered at 850 oC, which is comparable to the value of the bulk ceramic with an identical nominal chemical composition. The results are important for the affordable processing of functional thick film structures applicable in variety of electronic componets such as piezoelectric energy harvesters and ultrasound transducers.
| Speaker Country | Slovenia |
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