73 research outputs found
Laser printing of silver-based micro-wires in ZrO2 substrate for smart implant applications
Smart implants are endowed with functions of sensing, actuating and control to solve problems that may arise
during their use. The assembly of these functions along the implant surface is still a challenge. However, with the
advent of 3D printing, it is possible to print on implants’ surface, communication channels or micro-antennas or
even sensoric/actuating areas. Hence, a positive impact on the long-term performance of the implants (including
hip, dental and knee) may be expected with the proposed approach. Despite titanium and Ti6Al4V titanium alloy
are the standard choice for implants fabrication, 3Y-TZP (tetragonal 3% mol yttria-stabilized zirconia) has
emerged as a ceramic material suitable to overcome titanium alloy problems, due to its numerous advantages. In
this sense, this work is concerned with the ability of printing silver-based communication system in zirconia
substrates by using laser technology. For this purpose, micro-cavities were created on ZrO2 substrate, where the
silver powder was placed and sintered into them. Through the laser approach, silver-based wires with great
quality and low resistivity values were achieved. The flexural strength results showed that the mechanical resistance of zirconia disks was affected by laser micro-wire printing, which decreased as the laser passage was
performed. Based on the results, it is believed that the proposed approach seems to be effective for the manufacturing of implants with intrinsic capacities, useful for smart implant applications.This work has been supported by FCT (Fundação para a Ciência e
Tecnologia - Portugal) in the scope of the projects UID/EEA/04436/
2019 and NORTE-01-0145-FEDER-000018-HAMaBICo and
Add.Additive_Manufacturing to Portuguese Industry_POCI-01-0247-
FEDER-024533. Thank the CNPq (205791/2014-0) and CAPES for the
financial support
Femtosecond Laser Micromachining of Soda–Lime Glass in Ambient Air and under Various Aqueous Solutions
Lightning under water: Diverse reactive environments and evidence of synergistic effects for material treatment and activation
A miniature bio-inspired optic flow sensor based on low temperature co-fired ceramics (LTCC) technology
International audienceLow temperature co-fired ceramics (LTCC) technology is classically used in the field of radio frequencies to make items such as miniature transceivers for handheld devices. Here we harness the LTCC technology to autonomous micro-aerial vehicles (MAVs), a field in which small size and low mass are at a premium. Designing autonomous MAVs will be a highly challenging issue during the next few decades. Bio-inspired optic flow sensors, also known as elementary motion detector (EMD) circuits, have proved to be efficient means of providing animals and robots with visual guidance ability. The LTCC technology gives a good trade-off between the need for reliable optic flow sensors and the need for small-sized multiple electronic components. Comparisons with other technologies (PCB, analogue VLSI) show that LTCC technology is one of the most reliable solutions to the problem of obtaining reliable electronic EMDs that are small enough (area 7 mm x 7 mm) and light enough (mass 0.2 g) to be accommodated on-board a MAV. The output from our LTCC based optic flow sensors is largely invariant with respect to both contrast and spatial frequency. (c) 2006 Elsevier B.V. All rights reserved
Modeling and Experimental Investigation of Laser Drilling with Jet Electrochemical Machining
- …