起重机回转阀的匹配特性研究

针对起重机回转动作过程中有加速冲击的现象,严重影响了操作的舒适性和精准性。现对回转阀芯的匹配加以分析,找出影响回转冲击的关键因素,为后续的系统匹配提供理论依据。     

降低冰箱压缩机机械噪声的试验研究

本文就工作中一款压缩机噪声大问题,从噪声频谱、零件精度、零件配合度、零件清洁度等方面分析,找出因零件表面杂质引起活塞拉毛导致压缩机机械噪声超标原因,并提出相应解决措施。     

真空钎焊件超声检验质量控制

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。...     

重复频率对超声波探伤的某些影响

通过试验分析了脉冲重复频率对超声波探伤的某些影响和其原因,并给出了相关建议。     

长城1号防护涂层抗热腐蚀的性能

用等离子喷涂方法将长城1号及X-40涂层镀复在GH864高温合金试样上,然后进行热腐蚀试验,并用OM,SEM、EMPA进行性能分析。结果表明,长城1号涂层显示出比X-40涂层更优越的腐蚀抗力。提出了长城1号、X-40涂层及GH864基体合金可能的腐蚀机制。     

Hot Corrosion of Plasma Sprayed Coatings for Waste Gas Turbine Blades

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.     

空心轴壁厚差的超声波测量

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。