| SiO_2对自蔓延高温合成Al_2O_3-TiB_2复相陶瓷性能的影响 |
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| 引用本文： | 王德庆,刘晓敏.SiO_2对自蔓延高温合成Al_2O_3-TiB_2复相陶瓷性能的影响[J].大连铁道学院学报,2011(1):50-55,60. |
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| 作者姓名： | 王德庆 刘晓敏 |
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| 作者单位： | 大连交通大学材料科学与工程学院; |
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| 摘 要： | 利用自蔓延高温合成技术,用SiO2作添加剂制备出了Al2O3-TiB2复相陶瓷.研究了SiO2含量对自蔓延反应的绝热温度、燃烧速度、反应产物的体积和致密度的影响,并测定了复相陶瓷的抗弯强度和硬度.研究结果表明,Al-TiO2-H3BO3体系的绝热温度是2 588 K,且随SiO2含量的增加而降低;添加SiO2的合成产物中有SiO2和Al6O13Si2相生成;SiO2的加入还降低了反应体系的燃烧速度;当SiO2的添加量在0~20%变化时,复相陶瓷的密度达到1.603 g/cm3,相应的坯体体积变化率为9.25%~9.82%;复相陶瓷的硬度也随着SiO2添加量的增加而增大;在Al-TiO2-H3BO3体系中添加20%的SiO2,可使Al2O3-TiB2的抗弯强度提高2倍.
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| 关 键 词： | 自蔓延高温合成 Al2O3-TiB2复相陶瓷 抗弯强度 硬度 |
Effects of SiO_2 Additive on Self-Propagating High-Temperature Synthesis of Al_2O_3-TiB_2 Ceramic Composite |
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| WANG De-qing,LIU Xiao-min.Effects of SiO_2 Additive on Self-Propagating High-Temperature Synthesis of Al_2O_3-TiB_2 Ceramic Composite[J].Journal of Dalian Railway Institute,2011(1):50-55,60. |
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| Authors: | WANG De-qing LIU Xiao-min |
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| Affiliation: | WANG De-qing,LIU Xiao-min(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China) |
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| Abstract: | SiO2 was employed as additive in preparing Al2O3-TiB2 ceramic composite by self-propagating high-temperature synthesis technology.Effects of SiO2 content on adiabatic temperature,combustion wave velocity,volume change and composite density were studied,and bending strength and hardness of the synthesized ceramics were evaluated.Experiment results show that the adiabatic temperature of Al-TiO2-H3BO3 system is 2 588 K and decreases with increasing SiO2 addition.The addition of SiO2 results in the formation of... |
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| Keywords: | self-propagating high-temperature synthesis Al2O3-TiB2 ceramic composite bending strength hardness |
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