The influence of material properties on the wear of abradable materials
The influence of material properties on the wear of abradable materials
复制标题
材料性能对耐磨材料磨损的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Marshall
中科院分区：
文献类型：
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作者：
N. Fois;M. Watson;M. Marshall
在航空发动机中，压气机、涡轮或风扇的叶片都有可能进入它们的机壳。在这些界面处，使用复合耐磨材料衬里来限制对部件的损坏，从而维持发动机的整体效率和寿命。这些复合材料必须具有良好的耐磨性和抗侵蚀性。此前，在一个规模测试平台上，使用频闪成像和力测量来表征叶片与涂层接触处的磨损机制。这项工作的重点是表征磨损机制的两种不同的硬度的耐磨衬。将频闪成像技术和接触力测量与可磨材料的切片相结合，以分析材料在测试过程中的响应。为了进一步了解涂层硬度的影响，还对试验期间衬里的热性能和产生的温度进行了测量。利用涂层的磨损机理、材料响应、接触力和热性能来表征不同硬度下材料的不同行为。在低侵入率，与软涂层，叶片尖端成为磨损后，最初的粘合剂从涂层转移。测试后的切片显示叶片材料和显著的压实存在于涂层中。较硬的涂层在叶片顶端产生附着力，涂层中观察到凝固现象。热扩散率测量和建模表明，观察到的热驱动磨损是由于金属和hBN相之间的边界数量增加导致热流中断，导致表面热量集中。在较高的侵入率下，涂层之间的磨损机制更相似，切削机制占主导地位，产生可忽略不计的粘附和叶片磨损。
In aero-engines it is possible for the blades of the compressor, turbine or fan to incur into their casings. At these interfaces a lining of composite abradable material is used to limit damage to components and thereby sustain the efficiency and longevity of the engine as a whole. These composite materials must have good abradability and erosion resistance. Previously, the wear mechanisms at the contact between the blade and the coating have been characterised using stroboscopic imaging and force measurement on a scaled test-rig platform. This work is focused on the characterisation of the wear mechanism for two different hardnesses of abradable lining. The established stroboscopic imaging technique and contact force measurements are combined with sectioning of the abradable material in order to analyse the material’s response during the tests. A measure of the thermal properties and the resulting temperature of the linings during the test have also been made to further understand the effect of coating hardness. The wear mechanism, material response, contact force and thermal properties of the coating have been used to characterise the different material behaviour with different hardness. At low incursion rates, with a soft coating, the blade tip becomes worn after an initial adhesive transfer from the coating. Post-test sectioning showed blade material and significant compaction present in the coating. The harder coating produced adhesion on the blade tip with solidification observed in the coating. Thermal diffusivity measurements and modelling indicated that thermally driven wear observed was as a consequence of the increased number of boundaries between the metal and hBN phases present interrupting heat flow, leading to a concentration of surface heat. At higher incursion rates, the wear mechanism is more similar between the coatings and a cutting mechanism dominates producing negligible adhesion and blade wear.
可磨耗材料磨损与接触力关系的研究
DOI：
10.1177/1350650114545139
发表时间：
2014
期刊：
Journal of Engineering Tribology
影响因子：
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作者：
Fois N
通讯作者：
Fois N