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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ELECTROMAGNETIC ACOUSTIC TRANSDUCERS FOR TESTING POWER STATION BOILER TUBES
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ELECTROMAGNETIC ACOUSTIC TRANSDUCERS FOR TESTING POWER STATION BOILER TUBES

机译：用于测试电站锅炉管的电磁声换能器

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摘要

EMATs function very efficiently on certain types of magnetic oxides, which form on steel components. The transduction mechanism is well understood in the pure iron oxides and is due to a large magnetoelastic spin-wave energy gap. This effect is particularly large in hematite. The real oxides, which form on boiler tubes, vary in composition, thickness and have non-magnetic inclusions such as silicate ash from the fossil fuels. Further work is needed to study the effect of alloying elements in the parent steel on the composition of the oxides and EMAT efficiency. An investigation of the Fe_3O_4-Cr_3O_4 solid solution series could give an insight into the chromium rich oxides, which form on boiler tubes. On a more practical basis, battery powered EMAT equipment suitable for field operation has been developed and is now being employed for boiler tube surveys in power stations during outages.
机译：EMAT对在钢部件上形成的某些类型的磁性氧化物非常有效地起作用。在纯氧化铁中，转导机制是众所周知的，并且归因于较大的磁弹性自旋波能隙。在赤铁矿中这种作用特别大。在锅炉管上形成的真实氧化物，其成分，厚度各不相同，并具有非磁性夹杂物，例如来自化石燃料的硅酸盐灰。需要进一步的工作来研究母钢中合金元素对氧化物组成和EMAT效率的影响。对Fe_3O_4-Cr_3O_4固溶体系列的研究可以深入了解在锅炉管上形成的富铬氧化物。在更实际的基础上，已经开发出适用于现场操作的电池供电的EMAT设备，现在已用于停电期间电站的锅炉管道测量。

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