A Comparative Study on Radio-Frequency Thermal Plasma Spheroidization for Two Types of Alumina Ceramic Powder

Abstract:

To obtain high-performance alumina powder for high-tech application, a comparative study was carried out for the spheroidization of two types of alumina powder using radio-frequency argon-oxygen thermal plasma. The morphology, crystallography, and particle size distribution of spheroidized alumina powder were analyzed. The effect of feed rate on the spheroidization efficiency was investigated. The results show that when the powder flow rate was 35 g/min, the spheroidization efficiency reached up to 100%, and the alumina powder had perfect sphericity, while the spheroidization efficiency decreased with increasing powder flow rate. The X-ray diffraction analysis reveals that the spheroidized alumina powder had mixed crystal structures with a stable α phase and a part of metastable phase. The particle size distribution analysis shows that the particle size of the spheroidized alumina powder did not change obviously. These results will help us to better understand the process engineering of the spheroidization of ceramic powder using radio-frequency argon-oxygen thermal plasma, and provide simultaneously technical assistance for industrialization.

• Periodical: Advanced Materials Research (Volume 1058)
• Pages: 221-225
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1058.221
• Online since: November 2014
• Authors: Hai Long Zhu*, Hong Hui Tong, Fa Zhan Yang, Qin Wang, Chang Ming Cheng
• Keywords: Alumina Powder, Crystallography, Morphology, Thermal Plasma

References

[1] Cochran J K. Ceramic hollow spheres and their applications[J]. Curr. Opin. Solid State Mater. Sci., 1998, 5(3): 474–479.

[2] Marion F, Munz R J, Dolbec R, Xue S W, et al. Effect of plasma power and precursor size distribution on alumina nanoparticles produced in an inductively coupled plasma (ICP) reactor, [C]/19th International Symposium on Plasma Chemistry, Bochum, Germany, , 2009, Paper 011. 03.

[3] Lee W Y, Choic S S, Oh S M, et al. Preparation of spherical hollow alumina particles by thermal plasma [J]. Thin Solid Films, 2013, 529(1): 394–397.

DOI: 10.1016/j.tsf.2012.05.048

[4] Karoly Z, Szepvolgyi J. Hollow alumina microspheres prepared by RF thermal plasma [J]. Powder Technol., 2003, 132(1): 211–215.

DOI: 10.1016/s0032-5910(03)00077-9

[5] Tadayyon G, Zebarjad S M, Sajjadi S A. Effect of mechanical milling on the thermal behavior of polyethylene reinforced with nano-sized alumina [J]. Int. Polym. Proc., 2011, 26(4): 354–360.

DOI: 10.3139/217.2338

[6] Pershin L, Mitrasinovic A, Mostaghimi J. Treatment of refractory powders by a novel, high enthalpy dc plasma[J]. J. Phys. D: Appl. Phys., 2013, 46, 224019.

DOI: 10.1088/0022-3727/46/22/224019

[7] Jang J Y, Takana H, Park S, Nishiyama H. Advancement of in-Flight alumina powder spheroidization process with water droplet injection using a small power DC-RF hybrid plasma flow system[J]. Journal of Thermal Spray Technology, 2012, 21(5): 900-907.

DOI: 10.1007/s11666-012-9751-4

[8] Laha T, Balani K, Agarwal A, et al. Synthesis of nanostructured spherical aluminum oxide powder by plasma engineering [J]. Metall. Mater. Trans. A, 2005, 36(2): 301–309.

DOI: 10.1007/s11661-005-0303-0

[9] Jiang X L, Boulous M. Induction plasma spheroidization of tungsten and molybdenum powders[J]. Trans. Noferrous Met. Soc. China, 2006, 16(1): 13–17.

[10] Dignard N M, Boulos M I. Powder spheroidization using induction plasma technology, [C]/1st International Thermal Spray Conference, ASM international, Montreal Canada, 2000, 887–893.

DOI: 10.31399/asm.cp.itsc2000p0887

[11] Jin H Y, Xua L, Hou S E. Preparation of spherical silica powder by oxygen–acetylene flame spheroidization process [J]. J. Mater. Process. Technol., 2010, 210(1): 81–84.

DOI: 10.1016/j.jmatprotec.2009.08.009

[12] Atou T, Kusaba K, Fukuoka K, et al. Shock-induced phase transition of M2O3 (M = Sc, Y, Sm, Gd, and In)-type compounds [J]. J. Solid State Chem., 1990, 89(2): 378–384.

DOI: 10.1016/0022-4596(90)90280-b