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真空钎焊件超声检验质量控制南方航空动力机械公司廖小宁航空发动机燃烧室前涡流板组件是由镍基高温合金薄板钎焊而成,焊缝厚度只有40~60μm,质量要求严格,无损检测结果显示应包括缺陷大小、位置及分布状态等,只有超声C扫描技术能够承担该部件质量控制之重任。... 相似文献
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High temperature corrosion tests in 75%Na2SO4-25%. NaCl molten salt have been conducted on waspalloy specimens plasma sprayed with Co-Cr-B-Si, Ni-Cr-B-Si-hCr3C2, X-40, X-40 + TiC and Ni/Al + Al2O3 coatings, test coupons were exposed isothermally at 750℃up to 200 h. After the corrosion tests, each sample was examined by OM, SEM and EMPA. It was found that X-40, X-40 + TiC and Ni/Al + Al2O3 were violently corroded by the molten salt due to cracking and spalling of the coatings, whereas Co-Cr-B-Si and Ni-Cr-B-Si + Cr3C2 exhibited superior corrosion resistance, which were thought to be related to the formation of chromium and silicon oxide film. A possible corrosion mechanism had been proposed and it is suggested that the excellent corrosion resistance and high hot-hardness of the two B-Si containing coatings may be of significance for applications in petroleum refining industry as protective coatings of power generating turbine blades which are used under severe corrosion/erosion conditions. 相似文献
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空心轴壁厚差的超声波测量 总被引:1,自引:0,他引:1
给出了NOVASCOPE4000型超声测厚仪对某长空心轴壁厚的实测结果,分析了测量精度,提出了获得最佳精度的方法。 相似文献
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