Development of fabrication technology cold spraying for innovative coating by means of collision of high velocity solid particles

开发利用高速固体颗粒碰撞创新涂层冷喷涂制造技术

• 批准号: 18360352
• 负责人: FUKUMOTO Masahiro
• 金额: $ 9.56万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360352/
• 关键词: cold spray; non-melting particle; collision of high velocity particle; high deposition rate coating process; nozzle design; bow shock; deposition rate; fine particle; ガス温度; ガス圧力; 基材温度

Cold spraying has developed as a new technology to perform a high quality coating due to its lower heating of the powder. Relatively soft metals have been effectively coated by the process and superior coating properties compared with conventional coatings thermally sprayed have been reported. To establish the high quality coating by the process, utilization of fine particle may be effective. Typical identity of the process compared to the ordinal thermal spray process can be given by the coating formation unit as a solid particle, which collided onto the substrate surface or prior deposited coating surface at a quite higher velocity. To attain such a high collision velocity of the particle, especially for the fine particle around few pm in diameter, optimization in nozzle design still has to be performed. On the other hand, in a practical cold spraying, it has been indicated that the nominal velocity of the particle differ from net collision velocity due to bow shock effect on the sub … More strate surface. To realize a high collision velocity of the particle actually, especially in fine particle, bow shock problem onto the substrate surface has to be overcoine.To improve the deposition efficiency of copper fine particles, around 5 pm in diameter, in cold spray process onto metallic substrate, optimization in nozzle design was performed by numerical simulation. Particles velocity reached up to 585 m/s under the optimum conditions by using self-designed nozzle based on the simulation results. In the spraying of copper particle onto normal steel substrate, unique lamellar-like microstructure was formed near the interface region in the steel substrate. Work hardening may be induced significantly due to the higher velocity of the particles attained. Moreover, to reduce the bow shock effect on the substrate surface region in cold spray process, special nozzle was newly designed. The deposition efficiency, Vickers hardness and coating adhesion strength increased significantly especially in the case of both fine particle and higher pressure level of the working gas, while nominal particle velocity decreased with the special nozzle. Numerical simulation indicated that the pressure levels on the substrate surface decreased effectively in the nozzle newly designed. In the observation of sprayed individual particles onto the substrate, extended metal jet was recognized at the splat's periphery when the particle was sprayed by the special nozzle. The results indicate that the decrease of particles velocity due to bow shock was suppressed effectively in the special nozzle as compared with conventional one Less

冷喷涂由于其较低的粉末发热而发展成为一种高质量涂层的新技术。相对较软的金属已被有效地涂覆的过程和上级涂层性能相比，传统的涂层热喷涂已被报道。为了通过该工艺建立高质量的涂层，细颗粒的利用可能是有效的。与常规热喷涂工艺相比，该工艺的典型特性可以由涂层形成单元作为固体颗粒给出，其以相当高的速度碰撞到基底表面或先前沉积的涂层表面上。为了获得如此高的颗粒碰撞速度，特别是对于直径约为几μ m的细颗粒，仍然必须进行喷嘴设计的优化。另一方面，在实际冷喷涂中，由于弓形激波对基体的影响，使粒子的名义速度与净碰撞速度不同 ...更多信息 基板表面为了实现粒子，特别是细粒子的高碰撞速度，必须克服基体表面的弓形激波问题，为了提高直径约为5 μ m的铜细粒子在金属基体上的冷喷涂沉积效率，采用数值模拟的方法对喷嘴进行了优化设计。根据模拟结果，采用自行设计的喷嘴，在最佳条件下，颗粒速度达到585 m/s。在普通钢基体上喷涂铜粒子时，在钢基体界面附近形成了独特的层状组织。由于获得的颗粒的较高速度，可以显著地诱导加工硬化。另外，为了减小冷喷涂过程中弓形激波对基体表面区域的影响，设计了特殊的喷嘴。沉积效率，维氏硬度和涂层的结合强度显着增加，特别是在细颗粒和工作气体的压力水平的情况下，而与特殊的喷嘴的名义颗粒速度降低。数值模拟表明，新设计的喷嘴有效地降低了基片表面的压力水平。在对喷涂到基体上的单个颗粒的观察中，当颗粒被特殊的喷嘴喷涂时，在飞溅的外围识别出延伸的金属射流。结果表明，与常规喷嘴相比，该喷嘴有效地抑制了弓形激波引起的颗粒速度下降

项目成果

Deposition behavior of sprayed particle onto substrate surface in cold spray process

冷喷涂过程中喷涂颗粒在基材表面的沉积行为

• 发表时间: 2006
• 期刊: Proc. of ATSC-2006
• 作者: M. Fukumoto;H. Wada;K. Tanabe;M. Yamada
• 通讯作者: M. Yamada

Effect of substrate temperature on deposition behavior of copper particle on substrate surface in cold spray process

冷喷涂基体温度对基体表面铜颗粒沉积行为的影响

• 发表时间: 2007
• 期刊: J. Thermal Spray Technology 16(5-6)
• 作者: M. Fukumoto;H. Wada;K. Tanabe;M. Yamada
• 通讯作者: M. Yamada

Clarification of deposition mechanism of copper particle in cold spray process

阐明冷喷涂过程中铜颗粒的沉积机理

• 发表时间: 2007
• 期刊: Quarterly J. of Japan Welding Society 25-4
• 作者: M. Fukumoto;K. Tanabe;M. Yamada;E. Yamaguchi
• 通讯作者: E. Yamaguchi

低圧コールドスプレー法による銅皮膜の作製と評価

低压冷喷涂法铜镀层的制备及评价

• 发表时间: 2007
• 期刊: 溶接学会論文集 25-4
• 作者: 山田 基宏;和田 浩孝;佐藤 憲徳;福本 昌宏;安井 利明;山口 英二
• 通讯作者: 山口 英二

溶接学会誌特集「粒子積層プロセスの新しいトレンド」に寄せて, 粒子積層プロセスの新しいトレンドと将来動向

颗粒堆积工艺的新趋势和未来趋势，回应焊接学会专题“颗粒堆积工艺的新趋势”

• 发表时间: 2006
• 作者: K. Tanabe;H. Wada;M. Yamada;M. Fukumoto;E. Yamaguchi;M. Sugimoto;M. Izawa;福本昌宏
• 通讯作者: 福本昌宏