Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol
Continuous alumina fiber exhibits excellent mechanical properties owing to its dense microstructure with fine grains. In this study, alumina fiber was prepared by the sol–gel method using iron sol as a nucleating agent. It was proposed that the α-Al<sub>2</sub>O<sub>3</sub> g...
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MDPI AG
2020-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/23/5442 |
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| author | Luqun Liu Juan Wang Yunzhu Ma Wensheng Liu Shuwei Yao |
| author_facet | Luqun Liu Juan Wang Yunzhu Ma Wensheng Liu Shuwei Yao |
| author_sort | Luqun Liu |
| collection | DOAJ |
| description | Continuous alumina fiber exhibits excellent mechanical properties owing to its dense microstructure with fine grains. In this study, alumina fiber was prepared by the sol–gel method using iron sol as a nucleating agent. It was proposed that the α-Al<sub>2</sub>O<sub>3</sub> grain size be adjusted based on the modification of colloidal particle size. The effect of holding temperature and reaction material ratio on the iron colloidal particle size was studied. The microstructure of alumina fiber was characterized by scanning electron microscopy (SEM). The experiment results indicated that iron colloidal particle size increases with the holding temperature and the NH<sub>4</sub>HCO<sub>3</sub>/Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O ratio. The alumina fiber with uniform nano α-Al<sub>2</sub>O<sub>3</sub> grains was obtained by calcination at 1400 °C for 5 min. The mean grain size tends to rise with the mean colloidal particle size. Using the iron sol as a nucleating agent, the fiber with a mean grain size of 22.5 nm could be formed. The tensile strength of fibers increased with the decrease of grain size. |
| first_indexed | 2024-03-10T14:27:09Z |
| format | Article |
| id | doaj.art-6bdb857b458d41fb8c7423aea044739e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:27:09Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-6bdb857b458d41fb8c7423aea044739e2023-11-20T22:52:07ZengMDPI AGMaterials1996-19442020-11-011323544210.3390/ma13235442Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron SolLuqun Liu0Juan Wang1Yunzhu Ma2Wensheng Liu3Shuwei Yao4National Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, ChinaNational Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, ChinaNational Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, ChinaNational Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, ChinaNational Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, ChinaContinuous alumina fiber exhibits excellent mechanical properties owing to its dense microstructure with fine grains. In this study, alumina fiber was prepared by the sol–gel method using iron sol as a nucleating agent. It was proposed that the α-Al<sub>2</sub>O<sub>3</sub> grain size be adjusted based on the modification of colloidal particle size. The effect of holding temperature and reaction material ratio on the iron colloidal particle size was studied. The microstructure of alumina fiber was characterized by scanning electron microscopy (SEM). The experiment results indicated that iron colloidal particle size increases with the holding temperature and the NH<sub>4</sub>HCO<sub>3</sub>/Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O ratio. The alumina fiber with uniform nano α-Al<sub>2</sub>O<sub>3</sub> grains was obtained by calcination at 1400 °C for 5 min. The mean grain size tends to rise with the mean colloidal particle size. Using the iron sol as a nucleating agent, the fiber with a mean grain size of 22.5 nm could be formed. The tensile strength of fibers increased with the decrease of grain size.https://www.mdpi.com/1996-1944/13/23/5442alumina fiberiron solholding temperaturecolloidal particle sizegrain size |
| spellingShingle | Luqun Liu Juan Wang Yunzhu Ma Wensheng Liu Shuwei Yao Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol Materials alumina fiber iron sol holding temperature colloidal particle size grain size |
| title | Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol |
| title_full | Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol |
| title_fullStr | Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol |
| title_full_unstemmed | Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol |
| title_short | Preparation of Continuous Alumina Fiber with Nano Grains by the Addition of Iron Sol |
| title_sort | preparation of continuous alumina fiber with nano grains by the addition of iron sol |
| topic | alumina fiber iron sol holding temperature colloidal particle size grain size |
| url | https://www.mdpi.com/1996-1944/13/23/5442 |
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