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Title: Tape casting and characterizations of MgO ceramics

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [1];  [1];  [3];  [3];  [1];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. J. A. Woollam Co., Lincoln, NE (United States)
  3. Sienna Technologies Inc, Woodinville, WA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1630867
Report Number(s):
LA-UR-19-31298
Journal ID: ISSN 0002-7820; JACE
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 103; Journal Issue: 12; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mgo; tape casting; properties; hot isostatic pressing; magnesium oxide; sinter; sintering

Citation Formats

Chen, Ching-Fong, Baker, Timothy J., Synowicki, Ron, Tegtmeier, Eric Lee, Forsyth, Robert Thomas, Bissell, Ashley L., Orlowski, Alex G., Christopher, James Merlin, and Savrun, Ender. Tape casting and characterizations of MgO ceramics. United States: N. p., 2020. Web. doi:10.1111/jace.17136.
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. Tape casting and characterizations of MgO ceramics. United States. doi:https://doi.org/10.1111/jace.17136
Chen, Ching-Fong, Baker, Timothy J., Synowicki, Ron, Tegtmeier, Eric Lee, Forsyth, Robert Thomas, Bissell, Ashley L., Orlowski, Alex G., Christopher, James Merlin, and Savrun, Ender. Thu . "Tape casting and characterizations of MgO ceramics". United States. doi:https://doi.org/10.1111/jace.17136. https://www.osti.gov/servlets/purl/1630867.
@article{osti_1630867,
title = {Tape casting and characterizations of MgO ceramics},
author = {Chen, Ching-Fong and Baker, Timothy J. and Synowicki, Ron and Tegtmeier, Eric Lee and Forsyth, Robert Thomas and Bissell, Ashley L. and Orlowski, Alex G. and Christopher, James Merlin and Savrun, Ender},
abstractNote = {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.},
doi = {10.1111/jace.17136},
journal = {Journal of the American Ceramic Society},
number = 12,
volume = 103,
place = {United States},
year = {2020},
month = {4}
}

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