Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials
A kind of multiscale β-sialon grain-reinforced Al<sub>2</sub>O<sub>3</sub> matrix composite ceramic tool material, named ASN, was prepared and studied. For the ASN, β-sialon (molecular formula: Si<sub>4</sub>Al<sub>2</sub>O<sub>2</sub>N<...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/6/2333 |
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| author | Jian Zhu Yunna Xue Xiaolan Bai Xuehui Shen Jianqun He Yu Zhang Anhai Li |
| author_facet | Jian Zhu Yunna Xue Xiaolan Bai Xuehui Shen Jianqun He Yu Zhang Anhai Li |
| author_sort | Jian Zhu |
| collection | DOAJ |
| description | A kind of multiscale β-sialon grain-reinforced Al<sub>2</sub>O<sub>3</sub> matrix composite ceramic tool material, named ASN, was prepared and studied. For the ASN, β-sialon (molecular formula: Si<sub>4</sub>Al<sub>2</sub>O<sub>2</sub>N<sub>6</sub>) was synthesized in situ by a hot-pressing and solid-solution reaction process. A total of six samples were prepared at varying sintering temperatures and holding times under vacuum conditions. The solid solution reaction mechanism of β-sialon, the phase composition, mechanical properties, microstructure, and strengthening and toughening mechanisms of the composite ASN were investigated. As a result, within the experimental parameters, an optimal ASN tool material was obtained under a pressure of 32 MPa and at a temperature of 1550 °C for 20 min. The tested mechanical properties of the optimal sample were as follows: flexural strength 997 ± 59 MPa, fracture toughness 6.4 ± 0.3 MPa·m<sup>1/2</sup>, Vickers hardness 18.2 ± 0.4 GPa, and relative density 98.1 ± 0.2%. According to crystal defect theory, the solid solution reaction mechanism of in-situ-synthesized β-sialon in an Al<sub>2</sub>O<sub>3</sub> matrix involves a double mechanism of unequivalence (or hetero-valence) and interstitial filling. The multiscale β-sialon grains mainly consisted of four grains, which were elongated β-sialon grains with a diameter of 0.3–0.4 μm and an aspect ratio of 6–9, elongated β-sialon grains with a diameter of 70 nm and an aspect ratio of 10, β-sialon whiskers with a diameter of 0.2 μm and an aspect ratio of 12–15, and intragranular β-sialon whiskers with a diameter of 70 nm. The mechanical properties were improved due to strengthening and toughening mechanisms, such as mixed structure mode (intergranular and transgranular), elongated grain pullout, interface bonding, crack reflection, pinning, and bridging. |
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| spelling | doaj.art-c8d434cdd5d4472b8747cd7e195759b32023-11-17T12:20:44ZengMDPI AGMaterials1996-19442023-03-01166233310.3390/ma16062333Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool MaterialsJian Zhu0Yunna Xue1Xiaolan Bai2Xuehui Shen3Jianqun He4Yu Zhang5Anhai Li6School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaLaser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250103, ChinaSchool of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaKey Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, ChinaA kind of multiscale β-sialon grain-reinforced Al<sub>2</sub>O<sub>3</sub> matrix composite ceramic tool material, named ASN, was prepared and studied. For the ASN, β-sialon (molecular formula: Si<sub>4</sub>Al<sub>2</sub>O<sub>2</sub>N<sub>6</sub>) was synthesized in situ by a hot-pressing and solid-solution reaction process. A total of six samples were prepared at varying sintering temperatures and holding times under vacuum conditions. The solid solution reaction mechanism of β-sialon, the phase composition, mechanical properties, microstructure, and strengthening and toughening mechanisms of the composite ASN were investigated. As a result, within the experimental parameters, an optimal ASN tool material was obtained under a pressure of 32 MPa and at a temperature of 1550 °C for 20 min. The tested mechanical properties of the optimal sample were as follows: flexural strength 997 ± 59 MPa, fracture toughness 6.4 ± 0.3 MPa·m<sup>1/2</sup>, Vickers hardness 18.2 ± 0.4 GPa, and relative density 98.1 ± 0.2%. According to crystal defect theory, the solid solution reaction mechanism of in-situ-synthesized β-sialon in an Al<sub>2</sub>O<sub>3</sub> matrix involves a double mechanism of unequivalence (or hetero-valence) and interstitial filling. The multiscale β-sialon grains mainly consisted of four grains, which were elongated β-sialon grains with a diameter of 0.3–0.4 μm and an aspect ratio of 6–9, elongated β-sialon grains with a diameter of 70 nm and an aspect ratio of 10, β-sialon whiskers with a diameter of 0.2 μm and an aspect ratio of 12–15, and intragranular β-sialon whiskers with a diameter of 70 nm. The mechanical properties were improved due to strengthening and toughening mechanisms, such as mixed structure mode (intergranular and transgranular), elongated grain pullout, interface bonding, crack reflection, pinning, and bridging.https://www.mdpi.com/1996-1944/16/6/2333ceramic compositein situ growthmultiscale β-sialon grainsmicrostructuremechanical properties |
| spellingShingle | Jian Zhu Yunna Xue Xiaolan Bai Xuehui Shen Jianqun He Yu Zhang Anhai Li Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials Materials ceramic composite in situ growth multiscale β-sialon grains microstructure mechanical properties |
| title | Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials |
| title_full | Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials |
| title_fullStr | Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials |
| title_full_unstemmed | Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials |
| title_short | Preparation of In Situ Growth Multiscale β-Sialon Grain-Reinforced Al<sub>2</sub>O<sub>3</sub>-Based Composite Ceramic Tool Materials |
| title_sort | preparation of in situ growth multiscale β sialon grain reinforced al sub 2 sub o sub 3 sub based composite ceramic tool materials |
| topic | ceramic composite in situ growth multiscale β-sialon grains microstructure mechanical properties |
| url | https://www.mdpi.com/1996-1944/16/6/2333 |
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