热喷涂涂层结合强度的冲击测量法

发布时间：2018-06-18 04:41

本文选题：超音速等离子喷涂 + 涂层　；参考：《中国表面工程》2017年03期

【摘要】：讨论了一种新型快速定性评价热喷涂层结合强度的冲击测试方法,采用自由落体的落锤冲击设备对涂层进行冲击试验,并采用声发射技术进行动态监测,以定性分析涂层结合强度。首先用超音速等离子喷涂技术分别制备了组织致密,性能良好的Ni Cr金属、Cr_2O_3陶瓷涂层。采用90°和120°金刚石压头、120°及Ф2 mm球形硬质合金压头试验,其中120°硬质合金压头更适合冲击法测试涂层结合强度。随着冲击能量的提高,声发射的能量计数也不断提高,但是落锤高度超过400 mm后,能量计数变化不大,说明在400 mm时涂层发生了破坏。对基体金属、Ni Cr涂层、以及有无Co Cr Al Y为结合层的Cr_2O_3陶瓷涂层进行对比测试,发现声发射能量计数峰值随着涂层结合强度的增强而降低。
[Abstract]:A new impact test method for rapid qualitative evaluation of bonding strength of thermal spraying coating is discussed in this paper. The impact test of coating is carried out by free fall impact equipment, and dynamic monitoring is carried out by acoustic emission technology. The bonding strength of the coating was analyzed qualitatively. Firstly, the ceramic coatings of NiCr metal and Cr2O3 were prepared by supersonic plasma spraying, respectively, with dense microstructure and good properties. The experiments of 90 掳and 120 掳diamond heads with 120 掳and 2 mm spherical cemented carbides were carried out. The 120 掳cemented carbide head is more suitable for testing the bonding strength of the coating by impact method. With the increase of impact energy, the energy count of acoustic emission increases continuously, but when the height of drop hammer exceeds 400 mm, the energy count changes little, which indicates that the coating is destroyed at 400 mm. The comparison of NiCr coating on the substrate and Cr2O3 ceramic coating with or without Co Cr Al Y as bonding layer was carried out. It was found that the peak value of acoustic emission energy decreased with the increase of bonding strength of the coating.
【作者单位】：中国科学院过程工程研究所多相复杂系统国家重点实验室;海军工程大学勤务学院;装甲兵工程学院再制造技术重点实验室;陆军驻沈阳军代室;
【基金】：国家自然科学基金(51671180,51305453) 中国博士后科学基金(2016M601138)~~
【分类号】：TG174.4

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