Annapoorani Ketharam's research while affiliated with Loughborough University and other places

Publications (8)

Article
Additive manufacturing via direct ink writing and microwave dielectric characterisation of commercially produced low sintering temperature bismuth molybdenum oxide ceramics, have been both performed for the first time, following a powder-to-product holistic approach. We demonstrated that direct ink writing is an excellent candidate for producing di...
Article
Low sintering temperature, ultra-low loss microwave ceramics are envisaged as future dielectrics for fabricating low temperature co-fired ceramic (LTCC) components for 5G applications. Low sintering temperature bismuth molybdate β-Bi2Mo2O9 ceramic powders have been synthesised using a solid-state reaction method. Their additive manufacture and resu...
Article
Low sintering temperature, ultra-low loss microwave ceramics are envisaged as future dielectrics for fabricating low temperature co-fired ceramic (LTCC) components for 5G applications. Low sintering temperature bismuth molybdate β-Bi2Mo2O9 ceramic powders have been synthesised using a solid-state reaction method. Their additive manufacture and resu...
Article
Full-text available
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 A...
Conference Paper
Full-text available
This paper presents 3D printed low temperature sintered (< 700 °C) ceramic materials for microwave applications. The advantages of using cold sintered ceramics include better material compatibility with conductive elements in future multi-material additive manufacturing for microwave devices. Molybdate based ceramics have been synthesized and prepa...
Article
Flash and field assisted sintering techniques (FAST) have been demonstrated in many singular ceramic systems. However, little has been done to thoroughly investigate this phenomenon in binary systems. Zirconia-alumina composites are of interest because of their widespread use in demanding situations for health care, petrochemical and energy applica...
Patent
Full-text available
A method of forming granules, the method including forming a suspension of a nanopowder such as a nano zirconia powder containing yttria. The powder is formed from a suspension, and freon is added directly to the suspension as an additive. The suspension is then granulated by spray freeze drying, and the freon subsequently removed by heat treatment...

Citations

... In wireless communications [1], microwave technologies are used to achieve high reliability and a small volume of modern communication devices [2]. The rapid development of 5G communication is closely related to microwave technology, that is, the microwave dielectric ceramics (MWDCs) have been becoming the key materials in 5G communication [3][4][5][6][7]. ...
... Moreover, multimaterial LPBF can allow the construction of complex 3D metal circuits and ceramic package shapes with the desired materials at predefined locations for functionality or performance improvement (e.g. electrical conductivity, insulation performance, waterproof function, and seismic and compression resistance) (Gheisari et al. 2020;Raynaud et al. 2020;Sahasrabudhe and Bandyopadhyay 2016). Figure 26(a) shows a metal/glass multi-material decoration structure printed by LPBF , which demonstrates the innovative feasibility of multi-material LPBF in the jewelry field. ...
... The added benefit of using DIW processing for AM of ceramics is the possibility to produce final parts with periodic features and tailored properties by controlling the 3D printer's toolpath [30,31]. Such examples include shaping of more advanced RF devices, such as single material Fresnel zone plate lenses [32,33] or multi-material structures with tuneable properties (e.g controllable permittivity) [34][35][36] and functional devices by printing both electrodes and dielectrics [37,38]. ...
... Currently, most of the studies on Al 2 O 3 -ZrO 2 composite ceramics focus on the DC flash sintering behaviors and local microstructural analysis [24][25][26][27][28][29][30]. Furthermore, Bichaud et al. [31] investigated the flash sintering behaviors, as well as the relationship between incubation time and sample conductivity for Al 2 O 3 /tetragonal zirconia polycrystals (TZPs) composites under AC electric field. ...