2134/11535063.v1
Reza Gheisari
Reza
Gheisari
Henry Chamberlain
Henry
Chamberlain
George Chi-Tangyie
George
Chi-Tangyie
Shiyu Zhang
Shiyu
Zhang
Athanasios Goulas
Athanasios
Goulas
Chih-Kuo Lee
Chih-Kuo
Lee
Tom Whittaker
Tom
Whittaker
Dawei Wang
Dawei
Wang
Annapoorani Ketharam
Annapoorani
Ketharam
Avishek Ghosh
Avishek
Ghosh
Vaidhy Vaidhyanathan
Vaidhy
Vaidhyanathan
William Whittow
William
Whittow
Darren Cadman
Darren
Cadman
J. C. Vardaxoglou
J. C.
Vardaxoglou
Ian M Reaney
Ian M
Reaney
Daniel Engstrom
Daniel
Engstrom
Multi-material additive manufacturing of low sintering temperature Bi2Mo2O9 ceramics with Ag floating electrodes by selective laser burnout
Loughborough University
2020
Additive manufacturing
Metamaterials
Multi-material 3D printing
Selective laser burnout
Co-fired ceramics
Mechanical Engineering
2020-01-09 09:46:18
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Multi-material_additive_manufacturing_of_low_sintering_temperature_Bi2Mo2O9_ceramics_with_Ag_floating_electrodes_by_selective_laser_burnout/11535063
Additive manufacturing (AM) of co-fired low temperature ceramics offers a unique route for fabrication of novel 3D radio frequency (RF) and microwave communication components, embedded electronics and sensors. This paper describes the first-ever direct 3D printing of low temperature co-fired ceramics/floating electrode 3D structures. Slurry-based AM and selective laser burnout (SLB) were used to fabricate bulk dielectric, Bi2Mo2O9 (BMO, sintering temperature = 620–650°C, εr = 38) with silver (Ag) internal floating electrodes. A printable BMO slurry was developed and the SLB optimised to improve edge definition and burn out the binder without damaging the ceramic. The SLB increased the green strength needed for shape retention, produced crack-free parts and prevented Ag leaching into the ceramic during co-firing. The green parts were sintered after SLB in a conventional furnace at 645°C for 4 h and achieved 94.5% density, compressive strength of 4097 MPa, a relative permittivity (εr) of 33.8 and a loss tangent (tan δ) of 0.0004 (8 GHz) for BMO. The feasibility of using SLB followed by a post-printing sintering step to create BMO/Ag 3D structures was thus demonstrated.