Development and evaluation of an innovative cold spray nozzle for reactor pipe inner wall repair technology

反应堆管道内壁修复创新冷喷嘴技术的开发与评价

• 批准号: 22KJ0254
• 负责人: Meng Yuxian
• 金额: $ 1.09万
• 依托单位: Tokyo University of Science (2023)Tohoku University (2022)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KJ0254/
• 关键词: cold spray; nozzle design; underwater repair; leaking stoppage; piping maintenance; coatings; spiral nozzle; nuclear power plant

It still needs several decades until the Fukushima Daiichi nuclear power plant is completely decommissioned. To ensure the safe operation of the power plant during decommissioning, suitable maintenance technology needs to be developed. This research develops the low-pressure cold spray (LPCS) technique for nuclear piping maintenance, which has the advantages of low working temperature, high coating strength, and high flexibility.First, a spiral-shaped LPCS nozzle for coating the pipe's inner wall was designed. The experimental results demonstrated that the spiral nozzle could be used to fabricate the Perfluoroalkoxy Alkane coatings on the pipe's inner wall. This results indicated that the designed LPCS nozzle has the potential of improving the service life of the nuclear pipe. Then, two innovative application was explored: 1) water-leaking pipe repair and 2) underwater coating fabrication. The results demonstrate the feasibility of applying LPCS for on-site pipe repair regarding water leaks and underwater coating. Based on these exciting results, the conventional LPCS nozzle was redesigned to realize the high-deposition efficiency of 304L stainless steel for enhancing the coating strength.

它仍然需要几十年，直到福岛Daiichi核电站完全退役。为了确保在退役期间发电厂的安全运行，需要开发合适的维护技术。这项研究开发了用于核管道维护的低压冷喷雾剂（LPC）技术，该技术具有低工作温度，高涂层强度和高柔韧性的优势。首先，设计了用于涂层管道内壁的螺旋形LPC喷嘴。实验结果表明，螺旋喷嘴可用于在管道的内壁上制造全氟烷氧基烷涂层。该结果表明，设计的LPCS喷嘴具有改善核管使用寿命的潜力。然后，探索了两个创新的应用：1）浸泡管修复和2）水下涂料制造。结果表明，将LPC应用于漏水和水下涂层的现场管道修复的可行性。基于这些令人兴奋的结果，对常规LPCS喷嘴进行了重新设计，以实现304L不锈钢的高沉积效率，以增强涂料强度。

项目成果

Optimization of Spiral Cold Spray Nozzle Based on CFD Simulation Using Neural Networks

基于神经网络CFD模拟的螺旋冷喷涂喷嘴优化

• 发表时间: 2022
• 作者: Y. Meng;H. Saito;C.A. Bernard;Y. Ichikawa;K. Ogawa
• 通讯作者: K. Ogawa

Development of Zn-Sn coatings in the water environment by low-pressure cold spray

低压冷喷涂水环境中Zn-Sn涂层的研制

• 发表时间: 2023
• 作者: Y. Meng;H. Saito;C.A. Bernard;Y. Ichikawa;K. Ogawa
• 通讯作者: K. Ogawa

コールドスプレー法による配管き裂・穴あき部の補修技術確立と強度信頼性確保

建立管道裂纹、孔洞冷喷涂修复技术并保证强度可靠性

• 发表时间: 2023
• 作者: 鴫原 航大;蒙 兪先;齋藤 宏輝;市川 裕士;小川 和洋
• 通讯作者: 小川 和洋

Effect of Post-Spray Heat Treatment on the Bonding Strength and Microstructure of Cold Sprayed PFA Coating

喷后热处理对冷喷涂PFA涂层结合强度和微观结构的影响

• 发表时间: 2022
• 作者: Y. Meng;H. Saito;C.A. Bernard;Y. Ichikawa;K. Ogawa
• 通讯作者: K. Ogawa

Low-Pressure Cold Spray Nozzle Optimization for SUS304L Stainless Steel Deposition

SUS304L 不锈钢沉积的低压冷喷嘴优化

• 发表时间: 2022
• 作者: Y. Meng;H. Saito;C.A. Bernard;Y. Ichikawa;K. Ogawa
• 通讯作者: K. Ogawa