New type of 3D printing uses sound waves to build up objects typically involves depositing layer.

Описание: New type of 3D printing uses sound waves to build up objects

3D printing typically involves depositing layers of molten plastic, laser-melting powdered metal, or using UV light to harden gelatinous resin. A new technique takes yet another approach, however, by utilizing sound waves.
In the current version of the technique, a transducer is used to send focused pulses of ultrasound through the sides of a chamber, into liquid polydimethylsiloxane (PDMS) resin contained within. Doing so produces ultrasonic fields, which cause rapidly oscillating microscopic bubbles to temporarily form at specific points in the resin.

As those bubbles oscillate, the temperature inside them rises to about 15,000 degrees Kelvin (14,727 ºF or 26,540 ºF) and the pressure within them climbs to over 1,000 bar (14,504 psi). Although this sudden increase in temperature and pressure only lasts for picoseconds (trillionths of a second), it causes the resin to solidify at the exact location of the bubble.

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