The effect of post-treatments on the powder morphology of titanium dioxide (TiO2) powders synthesized for cold spray
The effect of post-treatments on the powder morphology of titanium dioxide (TiO2) powders synthesized for cold spray
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DOI：
10.1016/j.surfcoat.2011.07.030
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发表时间：
2011-10
影响因子：
5.4
通讯作者：
N. Salim;M. Yamada;H. Nakano;Koichiro Shima;Hiroaki Isago;M. Fukumoto
中科院分区：
文献类型：
--
作者：
N. Salim;M. Yamada;H. Nakano;Koichiro Shima;Hiroaki Isago;M. Fukumoto
提出了一种新的冷喷涂TiO2粉体的制备方法。该合成工艺是一种简单的硫酸氧钛（TiOSO 4）在蒸馏水中加入少量无机盐的水解方法。在相对较低的水解温度下，可以获得纯的TiO2，并且合成后处理（退火或水热处理）不会改变这种相结构。该粉末与精细的纳米初级颗粒团聚，不同的合成后处理导致不同的TiO 2纳米结构。退火导致初级颗粒的显著生长，颗粒内存在内部孔隙。另一方面，水热处理产生独特的取向团聚结构，其中初级颗粒在一个单晶轴上团聚。据信，无机离子吸附和后处理的协同效应导致所观察到的纳米结构。冷喷涂后，这表明这些TiO2粉末可以通过超音速固相沉积（冷喷涂）沉积。
In this study, a novel synthesis method of TiO2powders that can be cold sprayed is presented. The synthesis technique is a simple hydrolysis method of titanyl sulfate (TiOSO4) in distilled water with a small addition of inorganic salt. At a relatively low hydrolysis temperature, pure anatase TiO2can be obtained and post-synthesis treatments (annealing or hydrothermal treatment) do not alter this phase structure. The powder is agglomerated with fine nano primary particles, with different post-synthesis treatments leading to different TiO2nanostructures. Annealing causes a significant growth of primary particles with the existence of internal pores within a particle. On the other hand, hydrothermal treatment produces a unique oriented agglomeration structure where the primary particles are agglomerated in one single crystal axes. It is believed that the synergistic effect of inorganic ion adsorption and post-treatments results in the observed nanostructures. After cold spraying, it is revealed that these TiO2powders could be deposited via supersonic solid phase deposition (cold spray).