Direct 4D Printing Gradient Structure Ceramics
Knowledge Transfer Office, City University of Hong Kong
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Researchers have developed a novel direct 4D printing technology to simply and easily achieve and precisely control the manufacturing of complex ceramics architecture. The system can be free-standing, without extra fixtures, and only three steps are involved: printing, curing, and sintering. The inks for 4D printing are prepared by mixing polydimethylsiloxane (PDMS) with different amounts of alumina nanoparticles. A multi-jet printer is used to print a bilayer gradient structure, with each layer consisting of ink with different ceramic mass fractions. During the sintering process, ink with different concentrations undergoes different degrees of shrinkage, resulting in the tunable mismatch of the bilayer structure and achieving the targeted geometry accurately by the regulation of ink concentrations.
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