冷喷涂气体加热器的优化研究

Optimizing Study of Cold Spray Gas Heater

摘要:

传统冷喷涂气体加热器升温时间长、最高加热温度不足，为了进一步提高加热效率、降低喷涂耗气成本，对现有冷喷涂气体加热器进行升级改进，将两个加热器串联使加热器长度延长至6 m，获得了一种新型的高温气体加热器。采用该加热器开展Cu、Al、Ni、Ti典型材料的冷喷涂实验，研究了加热器对载气温度的加热效果和对冷喷涂层性能的影响。实验结果表明：新设计的高温加热器可提高气体最高加热温度，并实现快速升温；同时，新型加热器可实现冷喷涂Cu、Al和Ni材料沉积效率90%以上，并获得更高致密度的Ti涂层；在SUS304基体及Al基体分别喷涂Al和Ni涂层，涂层与基体的结合强度超过55 MPa。该新型气体加热器为冷喷涂工业化应用提供了设备基础。

Abstract:

The traditional cold spraying gas heater has a long heating time and insufficient maximum temperature. In order to further improve the heating efficiency and reduce the cost of spraying gas consumption， the existing cold spraying gas heater was upgraded and improved. Two heaters were connected in series to extend the length of the heater to 6 meters， and a new type of high-temperature gas heater was obtained. The heater was used to carry out cold spray experiments on typical materials of Cu， Al， Ni， and Ti， and the heating effect on the temperature of the carrier gas and the performance of the cold spray coating were studied. The experimental results show that the newly designed high-temperature heater can increase the maximum heating temperature of the gas and achieve rapid heating. Besides， the new heater can achieve over 90% deposition efficiency of cold-sprayed Cu， Al， and Ni materials and obtain a higher-density Ti coating. The Al and Ni coatings were sprayed on SUS304 substrate and Al substrate， respectively. The bonding strength of coating and substrate exceeded 55 MPa. The new gas heater provides the equipment basis for the industrial application of cold spraying.