Articles
All articles | Recent articles
Effects of Sintering Time on Microstructure and Properties of Alumina Foam Ceramics
Z. Chu1,2, C. Jia1,2, J. Liu1,2, R. Ding1,2, G. Yuan3
1 School of Material Science and Engineering, Shandong University of Technology, Zibo 255049, China
2 National Engineering Research Center of Industrial Ceramics of China, 12 Zhangzhou Road, Zibo 255049, China
3 Shandong Electric Shield Polytron Technologies Inc, Zibo 255000, China
received April 30, 2017, , accepted July 2, 2017
Vol. 8, No. 4, Pages 499-504 DOI: 10.4416/JCST2017-00028
Abstract
As heat insulating materials, alumina foam ceramics possess many advantages such as low thermal conductivity, high thermostability, good wear resistance, high hardness, and excellent resistance to corrosion. In this paper, a high-alumina foam ceramic was prepared with the gel-foaming method using aluminum dihydrogen phosphate as gel, and alumina fibers as reinforcing component. The effects of sintering time on phase components, fiber surface morphology, microstructure, and mechanical properties of the samples were investigated. It was found that C-AlPO4 with higher temperature stability demonstrated higher crystallinity, and increasing sintering time facilitated the conversion of T-AIPO4 to C-AIPO4. Meanwhile, the porosity first decreased with time followed by an increase, and the compressive strength increased first and then decreased. When the sintering time is 4 h, the optimized compressive strength reached 4.3 MPa. So, the best sintering time is 4 h.
Download Full Article (PDF)
Keywords
Foam ceramics, alumina fibers, microstructure, compressive strength
References
1 Zhu, X.W., Jiang, D.L., Tan, S.H., Zhang Z.Q.: Improvement in the thickness of reticulated porous ceramics, J. Am. Ceram. Soc., 84, 1654 – 1656, (2001).
2 Ren, Z.H, Jin, P., Cao, X.M., Zhang, J.S.: Mechanical properties and slurry erosion resistance of SiC ceramic foam/epoxy co-continuous phase composite, Compos. Sci. Technol., 107, 129 – 136, (2015).
3 Li, F.Z.: Study on the preparation technology of alumina porous ceramics with controllable porosity, (in Chinese), Ceram., 2, 24 – 27, (2009).
4 Yuan, L., He, Z.B., Yu, J.K.: Preparation of closed porous alumina-based ceramics by superplastic high-temperature foaming, (in Chinese), J. Northeast Univ., 34, 939 – 943, (2013).
5 Sciamanna, V., Nait-Ali, B., Gonon, M.: Mechanical properties and thermal conductivity of porous alumina ceramics obtained from particle stabilized foams, Ceram. Int., 41, 2599 – 2606, (2015).
6 Ma, L.J., Jiang, M.X.: Study on the mechanism of toughened alumina ceramics by alumina fibers, (in Chinese), Refract., 41, 149 – 150, (2007).
7 Lang, Y., Wang, C.A.: Al2O3-fiber-reinforced porous YSZ ceramics with high mechanical strength, Ceram. Int., 40, 10329 – 10335, (2014).
8 Liu, N., Ye, R.L.: Inorganic fiber reinforced ceramic composite, B. Chin. Ceram. Soc., 04, 64 – 70, (1989).
9 Hou, G.Y., Jin, Z.H., Qian, J.M.: Effect of holding time on the basic properties of biomorphic SiC ceramic derived from beech wood, Mater. Sci. Eng., 452 – 453, 278 – 283, (2007).
10 Dai, J.Q., Huang, Y., Xie, Z.P., Ma, T., Yang, J.L., Ma, J.T.: Effects of holding time on intergranular phase and mechanical property of GPS silicon nitride ceramics, J. Inorg. Mater., 18, 91 – 97, (2003).
11 Sutharsini, U., Ramesh, S., Wong, Y.H.: Effect of sintering holding time on low-temperature degradation of yttria stabilised zirconia ceramics, Mater. Res. Innov., 18, 408 – 411, (2014).
Copyright
Göller Verlag GmbH
