The Synthesis of Titanium Dioxide (TiO2) Powder for Cold Spray Process, IOP Conf. Series
The Synthesis of Titanium Dioxide (TiO2) Powder for Cold Spray Process, IOP Conf. Series
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用于冷喷涂工艺的二氧化钛 (TiO2) 粉末的合成，IOP Conf。
DOI：
10.1088/1757-899x/18/3/032019
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Fukumoto
中科院分区：
文献类型：
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作者：
N. Tjitra Salim;M. Yamada;H. Nakano;M. Fukumoto
二氧化钛（tio2）因其优异的光催化性能而受到广泛关注。二氧化钛作为光催化剂最好涂覆在大面积的基材上（墙壁、窗户等）。在这种情况下，冷喷涂工艺是最合适的技术，不仅因为它简单，大面积沉积效率高，而且因为它是一种低温工艺，可以保留涂层中tio2的高光催化锐钛矿相。然而，硬陶瓷材料的冷喷涂，如二氧化钛，是众所周知的困难。在这项研究中，我们报告了一种新的合成方法，即通过添加硫酸铵（(nh4) 2so4）水解硫酸钛（tioso4）来合成用于冷喷雾的二氧化钛粉末。这是一种相对简单的合成方法，即使不经过高温处理也能获得纯净的锐钛矿结构，尽管后处理如水热和煅烧等进一步提高了结晶度并改变了合成tio2的形貌。认为后处理的协同作用以及nh4 +和so4 -离子在tio2表面的吸附是导致tio2粉体形貌改变的原因。最后，进行了冷喷涂现场试验，结果表明该tio2粉体是可以进行冷喷涂的。这是一个显著的发现，因为众所周知，冷喷涂二氧化钛的困难。
Titanium dioxide (TiO 2) has attracted numerous attentions due to its high photocatalytic property. TiO 2 as photocatalyst is best to be coated over large area substrate (walls, windows, etc.). In this case, cold spray process is the most suitable technique, not only because its simplicity and efficiency for large area deposition, but also because it is a low temperature process that would retain the high photocatalytic anatase phase of TiO 2 in the coating. However, cold spraying of hard ceramic materials, such as TiO 2, is widely known to be difficult. In this study, we are reporting a novel synthesis method of TiO 2 powder for cold spray via the hydrolysis of titanyl sulphate (TiOSO 4) with addition of ammonium sulphate ((NH 4) 2 SO 4). It is a relatively simple synthesis method that can obtain pure anatase structure even without high temperature treatment, although post treatments, such as hydrothermal and calcination further increase the crystallinity and change the morphology of synthesised TiO 2. It is believed that the synergetic effect of post treatments and adsorption of NH 4+ and SO 4 2− ions on the surface of TiO 2 causes the alteration in morphology of TiO 2 powder. Finally, the cold spray spot test shows that the TiO 2 powders can be cold sprayed. This is a remarkable finding as the difficulty of cold spraying TiO 2 is widely known.