Journal ArticleDOI
Alumina Bodies for Electrical Applications
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TLDR
In this article, the effects of processing parameters and additions like clay, pyrophyllite and magnesium carbonate on densification have been studied in the range of 1500°-1800°C with a view to the utilization of these compositions for electrical applications.Abstract:
Alumina bodies have been prepared from commercially available, technical grade alumina. Effects of processing parameters and additions like clay, pyrophyllite and magnesium carbonate on densification have been studied in the range of 1500°–1800°C with a view to the utilization of these compositions for electrical applications.The bodies have been evaluated for microstructures and electrical properties at room temperature for 20 MHz. It was observed that alumina bodies containing 91–93% Al2O3 densified to the extent of 3.4–3.5 gm.cm−3 with imperviousness at 1500° to 1600°C. Bodies containing pyrophyllite exhibited dissipation factor as low as 0.0002 along with dielectric constant (K), in the range 6–7, while bodies containing alumina over 97% had a dissipation factor as low as 0.0001 having K in the range 7–8 when densities of these bodies exceeded 3.6 gm.cm−3 and open porosity decreased below 1%.read more
Citations
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Alumina Manufactured by Fused Filament Fabrication: A Comprehensive Study of Mechanical Properties and Porosity
TL;DR: In this paper , a comprehensive study of the processing and mechanical properties of the ceramic material Al2O3 on Fused Filament Fabrication technology (FFF) is presented.
Journal ArticleDOI
Fused Filament Fabrication of Alumina/Polymer Filaments for Obtaining Ceramic Parts after Debinding and Sintering Processes
TL;DR: In this paper , a hybrid commercially available alumina/polymer filament was 3D printed and thermally treated (debinding and sintering) to obtain ceramic parts, which were used to thoroughly characterize the green and sintered parts in terms of their mesostructured, as well as their flexural properties.
References
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Journal ArticleDOI
Role of Solute Segregation at Grain Boundaries During Final–Stage Sintering of Alumina
P. J. Jorgensen,J. H. Westbrook +1 more
TL;DR: In this article, the authors show that the addition of minor amounts of MgO or NiO to Al2O3 inhibits grain growth during sintering by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries.
Journal ArticleDOI
Solubilities of Magnesia, Titania, and Magnesium Titanate in Aluminum Oxide
Salil K. Roy,Robert L. Coble +1 more
TL;DR: In this article, the solubility of MgTiO3 in Al2O3 was measured as 1.10 × loW4, 3.00 × 10”4, 6.80 × 10−4, and 1.40 × 10-3 at 1530, 1630°, 1730° and 183O°C, respectively.
Journal ArticleDOI
Studies on Sintering of Technical Grade Alumina—Part I: Characterization of Ground Alumina Powders
P. Y. Dalvi,A. K. Kulkarni +1 more
TL;DR: In this paper, a characterization of powders prepared by comminution of technical grade commercial alumina has been made with respect to wet grinding media and ratio of weight of balls to material.
Journal ArticleDOI
Alumina Ceramics for the Electronic Industry—Part I
TL;DR: In this article, the advantages of using ceramics over glasses and those of using alumina over other materials in ceramic to metal seal assemblies are discussed, as well as the various property requirements of alumina for the above applications and for single and multilayer substrates.