Studies on syntheses of biscrown ether compounds

Multi-ester type biscrown ether compound(I) was prepared by the reaction of 6-bromoacetacetic ester dibenzo-16-crown-5(7) with phenyl-methyl ether-2,6-diformic acid potassium salt in anhydrous DMF at refluxed temperature, and color biscrown ether compound(II) was prepared by the reaction of 4′-aminobenzo-15-crown-5(12) with 2,2′(O-formoyl naphthyl)ethyl ether (9) in anhydrous ethanol at 40 C under N₂. New compounds(I, II) were characterized by IR,¹H NMR, MS and elemental analysis. Supported by the National Natural Science Foundation of China Niu Changrong: born in December, 12, 1938, Professor     

PFBC—CC燃机叶片试片腐蚀／磨蚀初步研究

介绍了ＰＦＢＣ－ＣＣ燃机叶片腐蚀／磨蚀试验装置的系统，主要部件，允许试验参数及其主要特点，累计４００多小时的热态试验表明该装置性能稳定，达到了设计要求，初步试验结果是，高，低温试验区均为腐蚀／磨蚀联合作用，高温试验区腐蚀为主，低温试验区磨蚀为主。     

Fe3Al基合金力学性能和显微组织的关系研究

显微组织对Ｆｅ３Ａｌ基合金的室温和高温力学性能以及抗蠕变性能有较大影响。研究表明，减少横向晶并不是提高Ｆｅ３Ａｌ合金室温塑性的最有效途径。通过加大形变量，细化显微组织可以明显改善合金的室温力学性能，但会使其高温性能下降。