This paper relates to the in-flight temperature and velocity of TiO2 particles, an integral part of the systematic research on atmospheric plasma spraying of the material. Initial powder feedstock (32-45 um, 100% rutile phase) was introduced into the plasma jet. Six parameters were selected to represent the versatility of the plasma system and their respective influences were determined according to basic One-at-a-time and advanced Taguchi design of experiments combined with analysis of variance analytical tool.It was found that the measured temperatures varied from 2121 K to 2830 K (33% variation), while the velocities of the particles altered from 127 m/s to 243 m/s (91% variation). Gun net power was detected as the most influential factor with respect to the velocity of the TiO2 particles (an increase of 8.4 m/s per 1 kW increase in net power). Spray distance was determined to have a major impact on the in-flight temperature (a decrease of 10 mm in spray distance corresponds to a drop of 36 K). A significant decrease in both characteristics was detected for an increasing amount of powder entering the plasma jet: a drop of 7.1 K and 1.4 m/s was recorded per every +1 g/min of TiO2 powder.
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机译：本文涉及TiO2粒子的飞行温度和速度，这是对该材料进行大气等离子喷涂系统研究的组成部分。将初始粉末原料（32-45 um，100％金红石相）引入等离子流中。选择了六个代表等离子体系统多功能性的参数，并根据基本的一次一次设计和先进的Taguchi实验设计并结合方差分析工具确定了各自的影响，发现测得的温度变化从2121 K到2830 K（33％变化），而粒子的速度从127 m / s变为243 m / s（91％变化）。相对于TiO2颗粒的速度，枪净功率是最有影响力的因素（净功率每增加1 kW会增加8.4 m / s）。确定喷雾距离对飞行中的温度有重大影响（喷雾距离减少10毫米对应于下降36 K）。对于进入等离子体射流的粉末数量增加，检测到两种特性均显着降低：每+1 g / min的TiO2粉末记录到7.1 K和1.4 m / s的下降。
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