Process control of reactive thermal spraying based on flying droplets diagnosis

基于飞滴诊断的反应热喷涂过程控制

• 批准号: 17360360
• 负责人: TSUNEKAWA Yoshiki
• 金额: $ 9.98万
• 依托单位: Toyota Technological Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360360/
• 关键词: Material processing; Composite materials; Plasma processing; Thermal spraying; Droplets diagnosis; 表面被覆; プラズマ溶射; スプラット; 発熱反応; インプロセス反応; 黒鉛; 鋳鉄; 飛行溶滴温度; 飛行溶滴速度; 自己潤滑作用

As a fundamental depositing step of reactive thermal spraying, besides the transition of thermal and kinetic energy to flying droplets, the droplets impact upon a substrate, the in-situ reaction is added. In the conventional thermal spraying accompanying without in-situ reaction, the short processing period of order of μs consisting of droplets collision on a substrate, droplets flattening and their solidification control the whole depositing process. However, the expected in-situ reactions play an important role upon the coating characteristics through both droplets flying and depositing stages.Temperature and velocity of flying droplets, in which the in-situ reactions proceed, were measured during the spray process. The obtained data were directly feedbacked to the spray parameters such as plasma current and plasma gas flow to control or monitor the in-situ reactions, that is, the required coating characteristics. The following are conclusions in the present study :(1) The measurement accuracy of droplets temperature and velocity is governed by the emissivity of a given droplet.(2) It is possible to feedback-control droplets temperature and velocity based on a certain spray parameter.(3) In the study regarding the microstructure control of composite coatings through changing the spray parameters, graphite carbon content in cast iron coatings is mainly controlled by the droplets velocity, that is, staying period in the plasma flame.

作为反应性热喷涂的基本沉积步骤，除了热能和动能向飞滴的过渡外，液滴还会对基材的影响，还添加了原位反应。在没有原位反应的传统热喷涂中，由液滴碰撞的μs的短处理周期在基板上碰撞，液滴变平及其凝固控制整个沉积过程。然而，预期的原位反应在涂料特性上通过飞行和沉积阶段起着重要作用。飞行液滴的温度和速度在喷雾过程中测量了原位反应。获得的数据直接反馈给喷雾参数，例如血浆电流和血浆气流，以控制或监测原位反应，即所需的涂层特性。以下是本研究中的结论：（1）液滴温度和速度的测量准确性受给定液滴的发射率的控制。（2）可以根据一定的喷雾参数来反馈对照液滴的温度和速度。（3）在研究中，通过对钢铁涂料的主要涂料进行了对钢铁涂料的研究。液滴速度，也就是说，在等离子体火焰中停留。

项目成果

Reactively Thermal Sprayed Composite Coatings with Different Partcle Temperature and Velocity

不同粒子温度和速度的反应热喷涂复合涂层

• 发表时间: 2006
• 期刊: Proc.International Thermal Spray Conference
• 作者: Y.Tsunekawa;I.Hamanaka;M.Hirose;I.Ozdemir
• 通讯作者: I.Ozdemir

超音波照射を利用するアルミニウム合金半凝固スラリーの作製

超声波辐照制备铝合金半固态浆料

• 发表时间: 2007
• 期刊: 日本鋳造工学会誌 79巻,2号
• 作者: 木下禎仁;恒川好樹;奥宮正洋
• 通讯作者: 奥宮正洋

Control of Graphite Carbon in Plasma Sprayed Cast Iron Coatings Through Frying Droplet Diagnostic

通过煎炸液滴诊断控制等离子喷涂铸铁涂层中的石墨碳

• 发表时间: 2006
• 期刊: Proc. 2^<nd> Asian Thermal Spray Conference (ATSC2006)
• 作者: T.Kozaki;Y.Tsunekawa;M.Okumiya
• 通讯作者: M.Okumiya

Control of Graphite Carbon in Plasma Sprayed Cast Iron Coatings through Flying Droplets Diagnostic

通过飞滴诊断控制等离子喷涂铸铁涂层中的石墨碳

• 期刊: Proc.2^<nd> Asian Thermal Spray Conference (ATSC2006)
• 作者: T.Kozaki;Y.Tsunekawa;M.Okumiya
• 通讯作者: M.Okumiya

In-process exothermic reaction in high-velocity oxyfuel and plasma spraying with SiO2/Ni/Al-Si-Mg composite powder

• DOI: 10.1361/105996305x59459
• 发表时间: 2005-09
• 期刊: Journal of Thermal Spray Technology
• 影响因子: 3.1
• 作者: I. Ozdemir;I. Hamanaka;Y. Tsunekawa;M. Okumiya