| Structure and mechanical properties of ZrO2-mullite nano-ceramics in SiO2-Al2O3-ZrO2 system |
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| 作者姓名： | 梁叔全 谭小平 李少强 唐艳 |
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| 作者单位： | School of Materials Science and Engineering Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | ZrO2-mullite nano-ceramics were fabricated by in-situ controlled crystallizing from SiO2-Al2O3-ZrO2 amorphous bulk. The thermal transformation sequences of the SiO2-Al2O3-ZrO2 amorphous bulk were investigated by X-ray diffraction, infrared spectrum, scanning electron microscope and differential scanning calorimetric. And the mechanical properties of the nano-ceramics were studied. The results show that the bulks are still in amorphous state at 900 ℃ and the t-ZrO2 forms at about 950 ℃ with a faint spinel-like phase which changes into mullite on further heating. ZrO2 and mullite become major phases at 1 100 ℃ and an amount of m-ZrO2 occur at the same time. The sample heated at 950 ℃ for 2 h and then at 1 100 ℃ for 1 h shows very dense and homogenous microstructure with ball-like grains in size of 20-50 nm. With the increase of crystallization temperature up to 1 350 ℃, the grains grow quickly and some grow into lath-shaped grains with major diameter of 5 μm. After two-step treatment the highest micro-hardness, flexural strength and fracture toughness of the samples are 13.72 GPa, 520 MPa and 5.13 MPa·m1/2, respectively.
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| 关 键 词： | SiO2-Al2O3-ZrO2体系 热处理 陶瓷 加工机械 |
| 收稿时间： | 6 May 2006 |
| 修稿时间： | 2006-05-06 |
Structure and mechanical properties of ZrO2-mullite nano-ceramics in SiO2-Al2O3-ZrO2 system |
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| Liang Shu-quan , Tan Xiao-ping , Li Shao-qiang and Tang Yan.Structure and mechanical properties of ZrO2-mullite nano-ceramics in SiO2-Al2O3-ZrO2 system[J].Journal of Central South University of Technology,2007,14(1):1-6. |
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| Authors: | Liang Shu-quan Tan Xiao-ping Li Shao-qiang and Tang Yan |
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| Affiliation: | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | ZrO2-mullite nano-ceramics were fabricated by in-situ controlled crystallizing from SiO2-Al2O3-ZrO2 amorphous bulk. The thermal transformation sequences of the SiO2-Al2O3-ZrO2 amorphous bulk were investigated by X-ray diffraction, infrared spectrum, scanning electron microscope and differential scanning
calorimetric. And the mechanical properties of the nano-ceramics were studied. The results show that the bulks are still in
amorphous state at 900 °C and the t-ZrO2 forms at about 950 °C with a faint spinel-like phase which changes into mullite on further heating. ZrO2 and mullite become major phases at 1 100 °C and an amount of m-ZrO2 occur at the same time. The sample heated at 950 °C for 2 h and then at 1 100 °C for 1 h shows very dense and homogenous
microstructure with ball-like grains in size of 20–50 nm. With the increase of crystallization temperature up to 1 350 °C,
the grains grow quickly and some grow into lath-shaped grains with major diameter of 5 μm. After two-step treatment the highest
micro-hardness, flexural strength and fracture toughness of the samples are 13.72 GPa, 520 MPa and 5.13 MPa·m1/2, respectively.
Foundation item: Project(2003AA332040) supported by the National High Technology Research and Development Program of China |
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| Keywords: | SiO2-Al2O3-ZrO2 system amorphous bulk heat treatment structural change mechanical properties |
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