The Effects of Water Addition on the Color and Crystalline Phase of Y2O3 Coatings Fabricated by Plasma Suspension Spray
The Effects of Water Addition on the Color and Crystalline Phase of Y2O3 Coatings Fabricated by Plasma Suspension Spray
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DOI：
10.4191/kcers.2016.53.6.641
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发表时间：
2016-11
影响因子：
2.5
通讯作者：
Sang-Jun Park;Jungki Lee;Y. Oh;Seongwong Kim;Hyungsun Kim;Sung-Min Lee
中科院分区：
文献类型：
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作者：
Sang-Jun Park;Jungki Lee;Y. Oh;Seongwong Kim;Hyungsun Kim;Sung-Min Lee
研究了加水对等离子悬浮喷涂 (SPS) 制备的 Y2O3 涂层或厚膜的影响。研究发现，在悬浮介质中添加水可以有效控制 SPS 制备的 Y2O3 涂层的颜色。即使样品具有相同的晶相，在 50 毫米的最短距离处，颜色也会随着水的添加而变化。变化与等离子体射流内液体悬浮液的破碎行为无关。发现水含量超过 50 vol% 时会产生未熔化的颗粒，这表明水抑制了向颗粒的热传递。然而，等离子射流温度不受影响。相反，与不加水的涂层相比，加水制备的涂层具有更高的氧含量和更低的碳含量。这是由于液体介质从悬浮液滴中完全蒸发的延迟，从而抑制了熔融Y2O3液滴的过度加热和蒸发。在这方面，讨论了相对于间距和加水量的结晶相发展。
The effects of water addition on Y₂O₃ coatings or thick films prepared by plasma suspension spray (SPS) have been investigated. Water addition in suspension media was found to be effective to control the color of a Y₂O₃ coating prepared by SPS. The color changed with water addition at the shortest stand-off distance of 50 mm even if samples had the same crystalline phase. Change was not correlated with fragmentation behavior of liquid suspension inside the plasma jet. Water content over 50 vol% was found to produce unmelted particles, indicating that water suppressed heat transfer to the particles. However, plasma jet temperature was not affected. Instead, the coating fabricated with water addition has higher oxygen and lower carbon content compared to these characteristics of the coating without water addition. This was attributed to the retarded complete evaporation of liquid media from the suspension droplet, resulting in inhibition of excessive heating and evaporation of the molten Y₂O₃ droplet. In this regard, crystalline phase development with respect to stand-off distance and water addition was discussed.