喷涂工艺对超音速火焰喷涂Al-Cu-Fe-Si准晶合金涂层性能的影响

发布时间：2018-04-17 17:43

本文选题：Al-Cu-Fe-Si准晶涂层 + 超音速火焰喷涂　；参考：《表面技术》2016年02期

【摘要】：目的使用活性燃烧高速燃气喷涂(AC-HVAF)方法制备高质量的Al-Cu-Fe-Si准晶涂层,研究喷涂工艺对涂层性能的影响。方法采用气雾化Al-Cu-Fe-Si准晶合金粉末,利用AK02T型AC-HVAF喷涂系统制备Al-Cu-Fe-Si准晶涂层材料。通过X射线衍射及扫描电镜观察分析准晶合金粉末和涂层的组织与结构,通过电化学工作站、显微硬度计和接触角测试仪等手段分析准晶合金涂层的耐蚀性、显微硬度及抗粘性能。结果对气雾化准晶Al-Cu-Fe-Si合金粉末的研究发现,冷却速率显著影响准晶合金粉末的组织,在冷却速率较快的粉末中形成胞状晶组织,准晶I相含量较高。对准晶合金涂层进行热处理,高温退火显著提高了涂层的硬度,950℃退火12 h后,硬度值达到(724±153)HV0.1。分别对准晶合金涂层和基体45~#钢的接触角进行测量,准晶合金涂层的接触角最大为95°,而45~#钢的仅为79°。通过电化学工作站测试比较涂层的耐蚀性,发现在3.5%(质量分数)的Na Cl溶液中,喷涂在45~#钢和5052铝合金基体上的涂层腐蚀电流密度J_(corr)分别为6.8×10~(-6),2.0×10~(-7)A/cm~2。结论不同粒径的气雾化准晶合金粉末的相组成不同,选择合适的粒径是保证铝基准晶合金涂层质量的前提。对涂层进行合适的热处理可以有效地提高涂层的显微硬度,铝基准晶合金涂层的接触角较45~#钢的高,提高了基体的抗粘性。不同基体上制备的准晶合金涂层的耐蚀性有很大差异,5052铝合金基体上的准晶涂层耐蚀性优于喷涂在45~#钢基体上的涂层。
[Abstract]:The purpose of the combustion of high speed gas spraying using active (AC-HVAF) Al-Cu-Fe-Si quasicrystal high quality coating preparation method, study the influence of spraying technology on coating properties. Methods the atomized Al-Cu-Fe-Si quasicrystal alloy powder, using AK02T type AC-HVAF spraying system for preparing Al-Cu-Fe-Si quasi crystal coating material. By X ray diffraction and scanning electron microscope analysis and organization structure quasicrystalline alloy powders and coatings, by electrochemical workstation, analysis of corrosion resistance of quasicrystalline alloy coating micro hardness and contact angle testing instrument, micro hardness and anti adhesion properties. The research on atomization of quasicrystal Al-Cu-Fe-Si alloy powder, the cooling rate influence of quasicrystal alloy powder, forming a columnar crystal in the organization powder faster cooling rate, the content of I phase. The higher quasicrystal heat treatment of quasicrystalline alloy coatings, high temperature annealing significantly improves the coating The hardness of the layer, annealed at 950 C for 12 h, the hardness value reached (724 + 153) HV0.1. measurements were performed on quasicrystalline alloy coating and 45~# steel substrate contact angle and the contact angle of quasicrystal alloy coating is 95 degrees, and the 45~# steel is only 79 degrees. Through the electrochemical workstation test comparison of corrosion resistance of coating, found in 3.5% (mass fraction) Na Cl solution, the corrosion current density of J_ coating on 45~# steel and 5052 Aluminum Alloy substrates (CORR) were 6.8 (-6) * 10~, 2 * 10~ (-7) A/cm~2. conclusion of different particle size aerosol quasicrystal alloy powder into different phases and select the appropriate particle size is a prerequisite to ensure the quality of Al based amorphous alloy coating. The coating of the proper heat treatment can effectively improve the hardness of Al based amorphous alloy coating, the contact angle of 45~# steel is high, improve the anti adhesive matrix. For preparation of quasicrystal alloy on different substrates The corrosion resistance of the coating is very different. The corrosion resistance of the quasicrystal coating on the 5052 aluminum alloy matrix is better than that of the coating on the substrate of the 45~# steel.

【作者单位】：同济大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51274151)~~
【分类号】：TG174.442

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