Reaction Sintering of Biocompatible Al2O3-hBN Ceramics

Oleksii Popov; Vladimir Vishnyakov; Leigh Fleming; Maxim Podgurskiy; Liam Blunt

doi:10.1021/acsomega.1c05749

Reaction Sintering of Biocompatible Al₂O₃-hBN Ceramics

Oleksii Popov, Vladimir Vishnyakov, Leigh Fleming, Maxim Podgurskiy, Liam Blunt

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

1 Citation (Scopus)

Abstract

Biocompatible Al2O3-hBN ceramic was sintered from AlN and B2O3 precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from Al2O3 and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered Al2O3-hBN. The reaction sintered ceramic has crack resistance in the region of 5.0 ± 0.1 MPa·m1/2, which is approximately 20% higher than previously reported pure Al2O3 or Al2O3-hBN sintered without reaction support. The higher amount of hBN in the developed Al2O3-hBN material (27 vol %) facilitates hardness lowering to the region of 6 GPa, which is closer to the bone hardness and makes the ceramic machinable. Reaction sintering of the Al2O3-hBN composite opens a new area of creation and formation of load-bearing Al2O3-hBN ceramic bioimplants.

Original language	English
Pages (from-to)	2205-2209
Number of pages	5
Journal	ACS Omega
Volume	7
Issue number	2
Early online date	7 Jan 2022
DOIs	https://doi.org/10.1021/acsomega.1c05749
Publication status	Published - 18 Jan 2022

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title = "Reaction Sintering of Biocompatible Al2O3-hBN Ceramics",

abstract = "Biocompatible Al2O3-hBN ceramic was sintered from AlN and B2O3 precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from Al2O3 and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered Al2O3-hBN. The reaction sintered ceramic has crack resistance in the region of 5.0 ± 0.1 MPa·m1/2, which is approximately 20% higher than previously reported pure Al2O3 or Al2O3-hBN sintered without reaction support. The higher amount of hBN in the developed Al2O3-hBN material (27 vol %) facilitates hardness lowering to the region of 6 GPa, which is closer to the bone hardness and makes the ceramic machinable. Reaction sintering of the Al2O3-hBN composite opens a new area of creation and formation of load-bearing Al2O3-hBN ceramic bioimplants. ",

keywords = "Boron nitrides, Machinability, Spark plasma sintering",

author = "Oleksii Popov and Vladimir Vishnyakov and Leigh Fleming and Maxim Podgurskiy and Liam Blunt",

note = "Funding Information: The authors are indebted to Dr. R. D. Shannon of E. I. du Pont de Nemours and Co., U.S.A., who kindly furnished the electrolyte samples and thank the Consiglio Nazionale delle Ricerche for the financial support. Publisher Copyright: {\textcopyright}",

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AU - Vishnyakov, Vladimir

AU - Fleming, Leigh

AU - Podgurskiy, Maxim

AU - Blunt, Liam

N1 - Funding Information: The authors are indebted to Dr. R. D. Shannon of E. I. du Pont de Nemours and Co., U.S.A., who kindly furnished the electrolyte samples and thank the Consiglio Nazionale delle Ricerche for the financial support. Publisher Copyright: ©

PY - 2022/1/18

Y1 - 2022/1/18

N2 - Biocompatible Al2O3-hBN ceramic was sintered from AlN and B2O3 precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from Al2O3 and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered Al2O3-hBN. The reaction sintered ceramic has crack resistance in the region of 5.0 ± 0.1 MPa·m1/2, which is approximately 20% higher than previously reported pure Al2O3 or Al2O3-hBN sintered without reaction support. The higher amount of hBN in the developed Al2O3-hBN material (27 vol %) facilitates hardness lowering to the region of 6 GPa, which is closer to the bone hardness and makes the ceramic machinable. Reaction sintering of the Al2O3-hBN composite opens a new area of creation and formation of load-bearing Al2O3-hBN ceramic bioimplants.

AB - Biocompatible Al2O3-hBN ceramic was sintered from AlN and B2O3 precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from Al2O3 and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered Al2O3-hBN. The reaction sintered ceramic has crack resistance in the region of 5.0 ± 0.1 MPa·m1/2, which is approximately 20% higher than previously reported pure Al2O3 or Al2O3-hBN sintered without reaction support. The higher amount of hBN in the developed Al2O3-hBN material (27 vol %) facilitates hardness lowering to the region of 6 GPa, which is closer to the bone hardness and makes the ceramic machinable. Reaction sintering of the Al2O3-hBN composite opens a new area of creation and formation of load-bearing Al2O3-hBN ceramic bioimplants.

KW - Boron nitrides

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KW - Spark plasma sintering

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Reaction Sintering of Biocompatible Al₂O₃-hBN Ceramics

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