ZrB2-SiC 超高温陶瓷氧化过程中 ZrSiO4 相形成机制研究

doi:10.3724/SP.J.1077.2011.00433

无机材料学报 ›› 2011, Vol. 26 ›› Issue (4): 433-437.DOI: 10.3724/SP.J.1077.2011.00433

ZrB₂-SiC 超高温陶瓷氧化过程中 ZrSiO₄ 相形成机制研究

高栋 ¹ , 张跃 ¹ , 许春来 ² , 宋扬 ² , 石晓斌 ²

1. 北京航空航天大学材料科学与工程学院 , 空天材料与服役教育部重点实验室 , 北京 100191; 2. 先进功能复合材料技术国防科技重点实验室 , 北京 100076

收稿日期:2010-06-03 修回日期:2010-07-15 出版日期:2011-04-20 网络出版日期:2011-04-22
作者简介:高栋 (1983 - ), 男 , 博士研究生 .

Formation Mechanism of Zircon Phase in ZrB₂-SiC Ceramic Composites during Oxidation

GAO Dong¹,ZHANG Yue¹,XU Chun-Lai²,SONG Yang¹,SHI Xiao-Bin²

1. Key Laboratory of Aerospace Materials and Performance Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China; 2. National key laboratory of advanced functional composite materials, Beijing 100076, China

Received:2010-06-03 Revised:2010-07-15 Published:2011-04-20 Online:2011-04-22

摘要/Abstract

摘要： 研究了ZrB₂-20vol%SiC超高温陶瓷在空气气氛中的氧化行为, 分析了氧化温度、氧分压和氧化时间等对硅酸锆形成和晶体生长过程的影响, 提出了ZrB₂-SiC超高温陶瓷氧化过程中硅酸锆相的形成机制. 热力学计算结果表明, 硅酸锆相的形成与高温下SiC的活性氧化有关. 实验结果表明, 常压氧化过程中, 硅酸锆的形成可分为两个阶段, (I)形核, 这一过程与SiC的活性氧化有关; (II)晶体生长, 随着氧化时间的延长, 氧化后形成的富硅玻璃相与氧化锆在硅酸锆晶核处反应, 晶粒进一步长大. 研究表明, 在 1500℃氧化90min后, 硅酸锆的晶粒尺寸达到100μm左右.

关键词: 硼化锆, 碳化硅, 硅酸锆, 活性氧化

Abstract: Oxidation of ZrB₂-20vol% ceramic composites in air was investigated, and the effects of oxygen partial pressure, oxidation temperature and holding time on the formation of zircon phase ZrSiO₄ were analyzed. The formation mechanism of zircon during oxidation in air of zirconium diboride-silicon carbide ceramic composites is proposed. Active oxidation of SiC is the major reason to explain the appearance of zircon according to thermal dynamic calculation results. The experimental results indicate that the formation of zircon can be divided into two steps: (I) Nucleation, which is related to the active oxidation of SiC; (II) Crystal growth, which is fulfilled by the reactions between silicate glass and zirconia crystalline at the interface of the zircon nuclei / melt. Zircon particles with mean size of 100 μm can be observed after oxidation in air for 90 min.

Key words: zirconium diboride, silicon carbide, zircon, active oxidation

中图分类号:

TQ174

高栋 , 张跃 , 许春来 , 宋扬 , 石晓斌. ZrB₂-SiC 超高温陶瓷氧化过程中 ZrSiO₄ 相形成机制研究[J]. 无机材料学报, 2011, 26(4): 433-437.

GAO Dong,ZHANG Yue,XU Chun-Lai,SONG Yang,SHI Xiao-Bin. Formation Mechanism of Zircon Phase in ZrB₂-SiC Ceramic Composites during Oxidation[J]. Journal of Inorganic Materials, 2011, 26(4): 433-437.

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ZrB₂-SiC 超高温陶瓷氧化过程中 ZrSiO₄ 相形成机制研究

Formation Mechanism of Zircon Phase in ZrB₂-SiC Ceramic Composites during Oxidation

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