Directionally solidified Al2O3/GAP eutectic ceramics by micro-pulling-down method

Xue Cao; Haijun Su; Fengwei Guo; Xi Tan; Lamei Cao

doi:10.1063/1.4966314

Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method

Xue Cao, Haijun Su, Fengwei Guo, Xi Tan, Lamei Cao

School of Materials Sience and Engineering

Beijing Institute of Aeronautical Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

We reported a novel route to prepare directionally solidified (DS) Al₂O₃/GAP eutectic ceramics by micro-pulling-down (μ-PD) method. The eutectic crystallizations, microstructure characters and evolutions, and their mechanical properties were investigated in detail. The results showed that the Al₂O₃/GAP eutectic composites can be successfully fabricated through μ-PD method, possessed smooth surface, full density and large crystal size (the maximal size: φ90 mm × 20 mm). At the process of Diameter, the as-solidified Al₂O₃/GAP eutectic presented a combination of "Chinese script" and elongated colony microstructure with complex regular structure. Inside the colonies, the rod-type or lamellar-type eutectic microstructures with ultra-fine GAP surrounded by the Al₂O₃ matrix were observed. At an appropriate solidificational rate, the binary eutectic exhibited a typical DS irregular eutectic structure of "chinese script" consisting of interpenetrating network of α-Al₂O₃ and GAP phases without any other phases. Therefore, the interphase spacing was refined to 1-2 μm and the irregular microstructure led to an outstanding vickers hardness of 17.04 GPa and fracture toughness of 6.3 MPa × m^1/2 at room temperature.

Original language	English
Title of host publication	Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
Subtitle of host publication	Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
Editors	Sergey G. Psakhie, Vasily M. Fomin, Victor E. Panin
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735414457
DOIs	https://doi.org/10.1063/1.4966314
State	Published - 10 Nov 2016
Event	International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016 - Tomsk, Russian Federation Duration: 19 Sep 2016 → 23 Sep 2016

Publication series

Name	AIP Conference Proceedings
Volume	1783
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
Country/Territory	Russian Federation
City	Tomsk
Period	19/09/16 → 23/09/16

Access to Document

10.1063/1.4966314

Cite this

Cao, X., Su, H., Guo, F., Tan, X., & Cao, L. (2016). Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method. In S. G. Psakhie, V. M. Fomin, & V. E. Panin (Eds.), Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016 Article 020021 (AIP Conference Proceedings; Vol. 1783). American Institute of Physics Inc.. https://doi.org/10.1063/1.4966314

Cao, Xue ; Su, Haijun ; Guo, Fengwei et al. / Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method. Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. editor / Sergey G. Psakhie ; Vasily M. Fomin ; Victor E. Panin. American Institute of Physics Inc., 2016. (AIP Conference Proceedings).

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abstract = "We reported a novel route to prepare directionally solidified (DS) Al2O3/GAP eutectic ceramics by micro-pulling-down (μ-PD) method. The eutectic crystallizations, microstructure characters and evolutions, and their mechanical properties were investigated in detail. The results showed that the Al2O3/GAP eutectic composites can be successfully fabricated through μ-PD method, possessed smooth surface, full density and large crystal size (the maximal size: φ90 mm × 20 mm). At the process of Diameter, the as-solidified Al2O3/GAP eutectic presented a combination of {"}Chinese script{"} and elongated colony microstructure with complex regular structure. Inside the colonies, the rod-type or lamellar-type eutectic microstructures with ultra-fine GAP surrounded by the Al2O3 matrix were observed. At an appropriate solidificational rate, the binary eutectic exhibited a typical DS irregular eutectic structure of {"}chinese script{"} consisting of interpenetrating network of α-Al2O3 and GAP phases without any other phases. Therefore, the interphase spacing was refined to 1-2 μm and the irregular microstructure led to an outstanding vickers hardness of 17.04 GPa and fracture toughness of 6.3 MPa × m1/2 at room temperature.",

author = "Xue Cao and Haijun Su and Fengwei Guo and Xi Tan and Lamei Cao",

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Cao, X, Su, H, Guo, F, Tan, X & Cao, L 2016, Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method. in SG Psakhie, VM Fomin & VE Panin (eds), Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016., 020021, AIP Conference Proceedings, vol. 1783, American Institute of Physics Inc., International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016, Tomsk, Russian Federation, 19/09/16. https://doi.org/10.1063/1.4966314

Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method. / Cao, Xue; Su, Haijun; Guo, Fengwei et al.
Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. ed. / Sergey G. Psakhie; Vasily M. Fomin; Victor E. Panin. American Institute of Physics Inc., 2016. 020021 (AIP Conference Proceedings; Vol. 1783).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Directionally solidified Al2O3/GAP eutectic ceramics by micro-pulling-down method

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AU - Su, Haijun

AU - Guo, Fengwei

AU - Tan, Xi

AU - Cao, Lamei

PY - 2016/11/10

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N2 - We reported a novel route to prepare directionally solidified (DS) Al2O3/GAP eutectic ceramics by micro-pulling-down (μ-PD) method. The eutectic crystallizations, microstructure characters and evolutions, and their mechanical properties were investigated in detail. The results showed that the Al2O3/GAP eutectic composites can be successfully fabricated through μ-PD method, possessed smooth surface, full density and large crystal size (the maximal size: φ90 mm × 20 mm). At the process of Diameter, the as-solidified Al2O3/GAP eutectic presented a combination of "Chinese script" and elongated colony microstructure with complex regular structure. Inside the colonies, the rod-type or lamellar-type eutectic microstructures with ultra-fine GAP surrounded by the Al2O3 matrix were observed. At an appropriate solidificational rate, the binary eutectic exhibited a typical DS irregular eutectic structure of "chinese script" consisting of interpenetrating network of α-Al2O3 and GAP phases without any other phases. Therefore, the interphase spacing was refined to 1-2 μm and the irregular microstructure led to an outstanding vickers hardness of 17.04 GPa and fracture toughness of 6.3 MPa × m1/2 at room temperature.

AB - We reported a novel route to prepare directionally solidified (DS) Al2O3/GAP eutectic ceramics by micro-pulling-down (μ-PD) method. The eutectic crystallizations, microstructure characters and evolutions, and their mechanical properties were investigated in detail. The results showed that the Al2O3/GAP eutectic composites can be successfully fabricated through μ-PD method, possessed smooth surface, full density and large crystal size (the maximal size: φ90 mm × 20 mm). At the process of Diameter, the as-solidified Al2O3/GAP eutectic presented a combination of "Chinese script" and elongated colony microstructure with complex regular structure. Inside the colonies, the rod-type or lamellar-type eutectic microstructures with ultra-fine GAP surrounded by the Al2O3 matrix were observed. At an appropriate solidificational rate, the binary eutectic exhibited a typical DS irregular eutectic structure of "chinese script" consisting of interpenetrating network of α-Al2O3 and GAP phases without any other phases. Therefore, the interphase spacing was refined to 1-2 μm and the irregular microstructure led to an outstanding vickers hardness of 17.04 GPa and fracture toughness of 6.3 MPa × m1/2 at room temperature.

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Cao X, Su H, Guo F, Tan X, Cao L. Directionally solidified Al₂O₃/GAP eutectic ceramics by micro-pulling-down method. In Psakhie SG, Fomin VM, Panin VE, editors, Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. American Institute of Physics Inc. 2016. 020021. (AIP Conference Proceedings). doi: 10.1063/1.4966314