Tape casting and characterizations of MgO ceramics

Chen, Ching-Fong; Baker, Timothy J.; Synowicki, Ron; Tegtmeier, Eric Lee; Forsyth, Robert Thomas; Bissell, Ashley L.; Orlowski, Alex G.; Christopher, James Merlin; Savrun, Ender

doi:10.1111/jace.17136

Tape casting and characterizations of MgO ceramics

Journal Article · Thu Apr 02 04:00:00 EDT 2020 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.17136· OSTI ID:1630867

^[1]; Baker, Timothy J. ^[1]; Synowicki, Ron ^[2]; ^[1]; Forsyth, Robert Thomas ^[1]; Bissell, Ashley L. ^[3]; Orlowski, Alex G. ^[3]; Christopher, James Merlin ^[1]; Savrun, Ender ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
J. A. Woollam Co., Lincoln, NE (United States)
Sienna Technologies Inc, Woodinville, WA (United States)

Herein we report a high density MgO ceramic substrate produced by the tape casting technology. The tape casting formulation and process produced a uniform tape free of cracking. Y₂O₃ and SiO₂ were used as the sintering aid for the pressureless sintering of the green tape. X-ray diffraction phase identification indicates that MgO is the main phase, while both Y₂O₃ and SiO₂ sintering aids react with MgO to form MgY₄Si₃O₁₃ as the second phase. Liquid phase sintering occurs in the temperature range from 1030°C to ~1500°C, which is confirmed by the simultaneous Thermal Gravitation Analysis/ Differential Scanning Calorimeter (TGA/DSC) and the percent linear shrinkage and densification. A 96.5% theoretical density was achieved by presureless sintering at 1650°C for 2 hours, which was further increased to a fully dense structure using hotisostatic- pressing(HIP) at 1650°C and 207 MPa in argon. Scanning electron microscopy (SEM) and energy dispersive(EDS) spectroscopic analysis on the HIP’ed sample show that MgY₄Si₃O₁₃ is located at the MgO grain boundary and the sample has a fully dense structure. The refractive indices and extinction coefficient were measured on the HIP’ed sample along with thermal properties and dielectric properties. Thermal diffusivity and heat capacity were measured to calculate the thermal conductivity.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1630867

Report Number(s):: LA-UR--19-31298

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 103; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Mgo
hot isostatic pressing
magnesium oxide
properties
sinter
sintering
tape casting

Tape casting and characterizations of MgO ceramics

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