Microstructure and mechanical properties of cold sintered porous alumina ceramics

Bilyaminu Suleiman; Hongtao Zhang; Yulong Ding; Yongliang Li

doi:10.1016/j.ceramint.2022.01.232

Microstructure and mechanical properties of cold sintered porous alumina ceramics

Bilyaminu Suleiman, Hongtao Zhang, Yulong Ding, Yongliang Li^*

^*Corresponding author for this work

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

New innovative approach to fabricate porous alumina ceramics by cold sintering process (CSP) is presented using NaCl as pore forming agent. The effects of CSP and post-annealing temperature on the microstructure and mechanical strength were investigated. Al₂O₃–NaCl composite with bulk density of 2.92 g/cm³ was compacted firstly using CSP and then a porous structure was formed using post-annealing at 1200°C–1500°C for 30 min. Brazilian test method and Vickers hardness test were used to determine the indirect tensile strength and hardness of the porous alumina, respectively. Meanwhile, the phases and the microstructure were respectively examined using X-ray diffractometer and scanning electron microscope (SEM) complemented by the 3D image analysis with X-ray tomography (XRT). SEM structural and XRT image analysis of cold sintered composite showed a dense structure with NaCl precipitated between Al₂O₃ particles. The NaCl volatization from the composite was observed during the annealing and then complete porous Al₂O₃ structure was formed. The porosity decreased from 48 vol% to 28 vol% with the annealing temperature increased from 1200 °C to 1500 °C, while hardness and mechanical strength increased from 14.3 to 115.4 HV and 18.29–132.82 MPa respectively. The BET analysis also showed a complex pore structure of micropores, mesopores and macropores with broad pore size distribution.

Original language	English
Pages (from-to)	13531-13540
Number of pages	10
Journal	Ceramics International
Volume	48
Issue number	10
Early online date	28 Jan 2022
DOIs	https://doi.org/10.1016/j.ceramint.2022.01.232
Publication status	Published - 15 May 2022

Bibliographical note

Funding Information:
Nigerian Government via Petroleum Technology Development Fund is appreciated for the Ph.D. scholarship support. The authors would also like to acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Grant Nos. EP/N000714/1 and EP/N021142/1 ).

Keywords

AlO
Cold sintering process
Hardness
Mechanical strength
Microstructure
Porosity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2022.01.232Licence: Creative Commons: Attribution (CC BY)

1-s2.0-S0272884222002498-mainFinal published version, 8.69 MBLicence: Creative Commons: Attribution (CC BY)

Adsorption Cooling-energy Conversion with Encapsulated Sorbents (ACCESS)
Ding, Y. (Co-Investigator), Li, Y. (Principal Investigator) & Zhang, Z. (Co-Investigator)
Engineering & Physical Science Research Council
1/06/16 → 31/12/19
Project: Research Councils
Cryogenic-temperature cold storage using micro-encapsulated phase change materials in slurries
Ding, Y. (Co-Investigator), Li, Y. (Principal Investigator), Zhang, Z. (Co-Investigator) & Al-Duri, B. (Co-Investigator)
Engineering & Physical Science Research Council
19/10/15 → 30/09/20
Project: Research

Cite this

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abstract = "New innovative approach to fabricate porous alumina ceramics by cold sintering process (CSP) is presented using NaCl as pore forming agent. The effects of CSP and post-annealing temperature on the microstructure and mechanical strength were investigated. Al2O3–NaCl composite with bulk density of 2.92 g/cm3 was compacted firstly using CSP and then a porous structure was formed using post-annealing at 1200°C–1500°C for 30 min. Brazilian test method and Vickers hardness test were used to determine the indirect tensile strength and hardness of the porous alumina, respectively. Meanwhile, the phases and the microstructure were respectively examined using X-ray diffractometer and scanning electron microscope (SEM) complemented by the 3D image analysis with X-ray tomography (XRT). SEM structural and XRT image analysis of cold sintered composite showed a dense structure with NaCl precipitated between Al2O3 particles. The NaCl volatization from the composite was observed during the annealing and then complete porous Al2O3 structure was formed. The porosity decreased from 48 vol% to 28 vol% with the annealing temperature increased from 1200 °C to 1500 °C, while hardness and mechanical strength increased from 14.3 to 115.4 HV and 18.29–132.82 MPa respectively. The BET analysis also showed a complex pore structure of micropores, mesopores and macropores with broad pore size distribution.",

keywords = "AlO, Cold sintering process, Hardness, Mechanical strength, Microstructure, Porosity",

author = "Bilyaminu Suleiman and Hongtao Zhang and Yulong Ding and Yongliang Li",

note = "Funding Information: Nigerian Government via Petroleum Technology Development Fund is appreciated for the Ph.D. scholarship support. The authors would also like to acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Grant Nos. EP/N000714/1 and EP/N021142/1 ).",

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AU - Li, Yongliang

N1 - Funding Information: Nigerian Government via Petroleum Technology Development Fund is appreciated for the Ph.D. scholarship support. The authors would also like to acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Grant Nos. EP/N000714/1 and EP/N021142/1 ).

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N2 - New innovative approach to fabricate porous alumina ceramics by cold sintering process (CSP) is presented using NaCl as pore forming agent. The effects of CSP and post-annealing temperature on the microstructure and mechanical strength were investigated. Al2O3–NaCl composite with bulk density of 2.92 g/cm3 was compacted firstly using CSP and then a porous structure was formed using post-annealing at 1200°C–1500°C for 30 min. Brazilian test method and Vickers hardness test were used to determine the indirect tensile strength and hardness of the porous alumina, respectively. Meanwhile, the phases and the microstructure were respectively examined using X-ray diffractometer and scanning electron microscope (SEM) complemented by the 3D image analysis with X-ray tomography (XRT). SEM structural and XRT image analysis of cold sintered composite showed a dense structure with NaCl precipitated between Al2O3 particles. The NaCl volatization from the composite was observed during the annealing and then complete porous Al2O3 structure was formed. The porosity decreased from 48 vol% to 28 vol% with the annealing temperature increased from 1200 °C to 1500 °C, while hardness and mechanical strength increased from 14.3 to 115.4 HV and 18.29–132.82 MPa respectively. The BET analysis also showed a complex pore structure of micropores, mesopores and macropores with broad pore size distribution.

AB - New innovative approach to fabricate porous alumina ceramics by cold sintering process (CSP) is presented using NaCl as pore forming agent. The effects of CSP and post-annealing temperature on the microstructure and mechanical strength were investigated. Al2O3–NaCl composite with bulk density of 2.92 g/cm3 was compacted firstly using CSP and then a porous structure was formed using post-annealing at 1200°C–1500°C for 30 min. Brazilian test method and Vickers hardness test were used to determine the indirect tensile strength and hardness of the porous alumina, respectively. Meanwhile, the phases and the microstructure were respectively examined using X-ray diffractometer and scanning electron microscope (SEM) complemented by the 3D image analysis with X-ray tomography (XRT). SEM structural and XRT image analysis of cold sintered composite showed a dense structure with NaCl precipitated between Al2O3 particles. The NaCl volatization from the composite was observed during the annealing and then complete porous Al2O3 structure was formed. The porosity decreased from 48 vol% to 28 vol% with the annealing temperature increased from 1200 °C to 1500 °C, while hardness and mechanical strength increased from 14.3 to 115.4 HV and 18.29–132.82 MPa respectively. The BET analysis also showed a complex pore structure of micropores, mesopores and macropores with broad pore size distribution.

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Microstructure and mechanical properties of cold sintered porous alumina ceramics

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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Projects

Adsorption Cooling-energy Conversion with Encapsulated Sorbents (ACCESS)

Cryogenic-temperature cold storage using micro-encapsulated phase change materials in slurries

Cite this