Influences of Heat Treatment on A95 Polycrystalline Alumina Fibers Preparation

Abstract:

In order to discuss chemical and physical reaction of A95 polycrystalline alumina fibers (PAF) during heat treatment and improve the properties, the influences of the protective atmosphere and heat treatment temperature on properties of PAF were researched. DT-TG, IR, XRD and SEM were adopted to characterize the fibers. The results show that in N₂ atmosphere, the carbonization and oxidation rates of the gel fibers decrease, the thermal decomposition process of the organics is extended and the crystal transformation temperature of alumina is enhanced. When the heat treatment temperature is lower than 1200 °C, the major phases of A95 PAF are mainly δ-Al₂O₃ and θ-Al₂O₃, but no α-Al₂O₃ appears.

• Periodical: Applied Mechanics and Materials (Volume 528)
• Pages: 168-174
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.528.168
• Online since: February 2014
• Authors: Yong Zhi Zhang*, Hong Xia Li, Ke Ming Geng, Ai Jun Wu
• Keywords: Gel Fibers, Heat Treatment, Polycrystalline Alumina Fibers, Protective Atmosphere

References

[1] Kun Li, Jinhua Li, Jinchun Li, et al. Fabrication and properties of PLZT ceramic fiber/epoxy 1-3 composites. Journal of Inorganic Materials, 19(2004, 2) 361-366. In Chinese.

[2] Ramanan Venkatesh, Sutapa Roy Ramanan. Influence of processing variables on the microstructure of sol–gel spun alumina fibres. Materials Letter, 3(2002) 189-195.

DOI: 10.1016/s0167-577x(01)00644-9

[3] Ramanan Venkatesh, Sutapa Roy Ramanan. Effect of organic additives on the properties of sol-gel spun alumina fibres. Journal of the European Ceramic Society, 11-15(2000) 2543-2549.

DOI: 10.1016/s0955-2219(00)00135-7

[4] Yongzhi Zhang, Hongxia Li, jialin Sun, et al. Influences of polyvinyl alcohol on A95-polycrystalline-alumina fibers synthesized. Journal of Shenyang University of Technology, 33(2011, 1 ) 55-61. In Chinese.

[5] J. Chandradass, M. Balasubramanian. Sol–gel processing of alumina fibres. Journal of Materials Processing Technology, 3(2006) 275-280.

DOI: 10.1016/j.jmatprotec.2005.11.030

[6] Birchall, James D. Morton, Michael J. US Patent 4, 320, 074. (1982).

[7] Jianfeng Zhang. Preparation of alumina based continuous ceramic fibre. Master dissertation of Shan dong University (2004). In Chinese.

[8] Qianjun Huang, Xiaojun Chen, Lifu Chen. Preparation of the polycrystalline alumina fibers by sol-gel progress. Journal of Xiamen University, 45(2006, 3) 375-378. In Chinese.

[9] Yongzhi Zhang, Hongxia Li, Jialin Sun, et al. Influences of Al3+/Cl- on poly aluminum chloride performances. J. Huazhong Univ. of Sci. & Tech. (Natural Science Edition), 6(2010) 116-119. In Chinese.

[10] Yongzhi Zhang, Hongxia Li, Jialin Sun, et al. Influences of polyvinyl alcohol additions on properties of Al2O3- SiO2 sols. Naihuo Cailiao. 4(2010) 247-250, 255. In Chinese.

[11] Yongzhi Zhang, Hongxia Li, Jialin Sun, et al. Influences of the percentage content of alumina, viscocity of sol，and rotating speed of the rotating disk on the diameter of gelfiber. Industrial Furnace, 32(2010, 2) 37-40. In Chinese.

[12] Zhiming Wang, Hao Wang. The fourier transform infrared absorption spectra of the Al2O3- SiO2 sol. Glass Fiber，1(2000) 6-8. In Chinese.

[13] Xiangdong Hao, Xinwei Wang, Hongbo Zhu. Preparation of aluminosilicate refractory fibers by using sol-gel process. Hi-Tech Fiber ＆ Application，28(2003, 3) 39-42. In Chinese.

[14] Low I. M. ，McPherson R. Crystallization of gel-derived alumina and alumina-zirconia ceramics. Journal of Materials Science，24(1989, 3) 892-898.

DOI: 10.1007/bf01148774

[15] Keyou Wang. Flocculate mechanism analysis of poly-aluminum-chloride. South Smelting Technology，6(1999, 5) 23-25. In Chinese.

[16] Baoyu Gao, Qinyan Yue, BingjianWang, et al. Structure characterization and coagulation effect of nano-sized poly-aluminum-chloride with high content of Al13 species. China Environmental Science，23(2003, 6) 657-660. In Chinese.