| Al-TiO2-B2O3-C系XD合成铝基复合材料的反应机理及力学性能 |
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| 引用本文： | 朱和国,王恒志,吴申庆.Al-TiO2-B2O3-C系XD合成铝基复合材料的反应机理及力学性能[J].材料科学与工艺,2008,16(6):835-839. |
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| 作者姓名： | 朱和国 王恒志 吴申庆 |
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| 作者单位： | [1]南京理工大学材料科学与工程系,南京210094 [2]东南大学材料科学与工程系,南京210096 |
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| 摘 要： | 研究了Al-TiO2-B2O3-C反应系XD合成铝基复合材料的反应机理.结果表明在Al-TiO2-B2O3-C系中,当B2O3/TiO2摩尔比=0.5,C/TiO2摩尔比=0时,TiO2和B2O3分别与Al结合生成热力学稳定的Al2O3和活性Ti原子、B原子,B原子和Ti原子分别穿过各自反应层结合生成热力学稳定的TiB2,过剩的Ti原子则与Al结合生成棒状物Al3Ti;加入碳粉后,Ti原子将优先与C和C与Al的化合物Al4C3反应生成TiC,Al3Ti逐渐减少,在C/TiO2摩尔比为0.5时,Al3Ti相基本消失,力学性能得到改善,其拉伸强度和延伸率分别从266MPa和3%增加到315MPa和7%.
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| 关 键 词： | 原位反应 铝基复合材料 反应机理 摩尔比 力学性能 |
The reaction mechanism and properties of the aluminum matrix composites fabricated by XD method in Al- TiO2-B2O3-C system |
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| ZHU He-guo,WANG Heng-zhi,WU Shen-qing.The reaction mechanism and properties of the aluminum matrix composites fabricated by XD method in Al- TiO2-B2O3-C system[J].Materials Science and Technology,2008,16(6):835-839. |
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| Authors: | ZHU He-guo WANG Heng-zhi WU Shen-qing |
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| Affiliation: | 1.Department of Materials Science and Engineering,Nanjing University of science and technology,Nanjing 210094;2.Department of Materials Science and Engineering,Southeast University,Nanjing 210096) |
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| Abstract: | The reaction mechanism of the composites fabricated by XD（exothermic dispersion synthesis） method in the Al-TiO2-B2O3-C system was discussed.The results indicated that with the mole ratio B2O3/TiO2of 0.5 and without carbon powders,the TiO2 and B2O3 firstly reacted with liquid aluminum to form Al2O3 particulates,Ti atoms and Al2O3 particulates,B atoms respectively.Active Ti and B atoms diffused from the reaction region to the liquid aluminum and to form TiB2.The residual Ti atoms would react with Al atoms to form Al3Ti.With the increasing of C/TiO2,the amount of the Al3Ti decreased and would disappear when the mole ratio of C/TiO2 was about 0.5,because that the residual Ti atoms previous reacted with C and Al4C3to form TiC,and the ultimate tensile strength and elongation of the composites increase from 266 MPa and 3% to 315 MPa and 7% respectively. |
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| Keywords: | in-situ reaction aluminum matrix composites reaction mechanism mole ratio mechanical properties |
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