Warm spraying: An improved spray process to deposit novel coatings
Warm spraying: An improved spray process to deposit novel coatings
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DOI：
10.1016/j.surfcoat.2008.04.011
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发表时间：
2008-06-15
影响因子：
5.4
通讯作者：
Kuroda, Seiji
中科院分区：
文献类型：
--
作者：
Kawakita, Jin;Katanoda, Hiroshi;Kuroda, Seiji
温喷涂是一种大气涂层工艺，通过在800（类似于1900 K）和900（类似于1600 m s（-1））之间控制的超音速射流加热和加速固体颗粒的连续冲击和沉积。本文介绍了用热喷涂技术成功地制备出致密、氧化程度低的金属钛（Ti）涂层，并对喷涂过程中出现的现象进行了澄清。对飞行中钛粒子的温度和速度进行了测量，并与基于流体动力学模拟的计算结果进行了比较。采用有限元法分析了颗粒从撞击到沉积的变形行为。通过对原料钛粉施加双峰粒度分布，实现了堆积颗粒的致密化。通过元素分析和基于氧化模型的计算证明了所获得的Ti涂层的化学组成变化的定性限制。温喷涂使各种材料能够制造涂层，而不会使原始特性（如纯度和晶相）发生热劣化。(C)2008 Elsevier B. V.保留所有权利。
Warm Spray is an atmospheric coating process through continuous impact and deposition of solid particles heated and accelerated by a supersonic jet controlled between 800 similar to 1900 K and 900 similar to 1600 m s(-1). This paper introduces successful fabrication of dense and less-oxidized metallic titanium (Ti) coatings by Warm Spray and clarification of phenomena occurring upon the spray process. Temperature and velocity of an in-flight Ti particle were compared between measurement by the diagnostic instrument and calculation based on the fluid dynamics simulation. Deformation behaviour of particle from impact to deposition was analyzed through the finite element method (FEM). Densification of stacking particles was attained by applying bi-modal size distribution to the feedstock Ti powder. Qualitative restriction of changes in chemical composition of Ti coating obtained was demonstrated by elemental analysis and by calculation based on the oxidation model. Warm Spray enables various materials to fabricate coatings without thermal deterioration of the original characteristics such as purity and crystallographic phase. (C) 2008 Elsevier B.V. All rights reserved.