本文采用熔剂保护法，以金属镁为基体，以尺寸5~10μm的碳化硅颗粒为增强相，制备了碳化硅颗粒增强的镁基复合材料。研究了各种制备条件对复合材料微观组织及性能的影响。 实验得到了均匀弥散分布的碳化硅颗粒增强的镁基复合材料，其最佳制备条件为：复合温度845℃；保温时间60min；保温温度400℃；冷却方式空气冷却；SiC颗粒加入方式为把镁条盘成圆形，SiC颗粒均匀掺入到镁圆盘的缝隙中；SiC颗粒的预处理方式是在800℃高温焙烧2小时。 复合材料相组成分析表明，在复合材料的制备过程中，界面发生轻微的化学反应，有高强硬质的Mg2Si结构材料生成。 SiC颗粒增强镁基复合材料的性能研究表明，随着SiC颗粒加入量的增加，复合材料的硬度和密度也呈增加趋势；SiC颗粒可作为增强相有效地提高基体镁的抗拉强度和屈服强度，当SiC颗粒加入量相同，复合材料的其它制备条件不同时，材料的抗拉强度和屈服强度也有差异；随着SiC颗粒加入量的增加，复合材料的电导率逐渐降低。 SiCp/Mg复合材料断口微观形貌分析显示，复合材料的断裂属于基体韧断、界面脱开和增强体颗粒断裂三种模式。空洞首先在增强体颗粒处形成，形成方式有颗粒剥离和颗粒断裂。空洞形成后有少量的长大，随后在颗粒之间的基体处，由于变形的严重局部化，使小空洞快速形成、长大，最终聚集断裂。

3-Aldehydosalicylic acid was firstly prepared by boiling hexamethylenetatramin and salicylic acid in aqueous slotion, and then the ligand, 3-aldehydosalicylic acid-2,4- dinitrophenyl hydrazone, was synthesized by 3-aldehydosalicylic acid and 2,4-dinitrophenyl hydrazine in ethanol solution. The novel thirteen complexes were synthesized by reacting 3-aldehydosalicylic acid-2,4- dinitrophenyl hydrazone and rare earth nitrate(RE=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Y) in methanol solution. The formulate C14H10N4O7 and RE(C14H9N4O7)3?nH2O(n=2 or 3) were determined by elemental analysis, IR, 1H NMR, 13C NMR, UV, FS and X-ray power diffraction. The research show that the ligand and the complexes belong to L*-L luminescent compounds because of their strong fluorescence characteristics, and all the three ligands were coordinated in the form of negative one value and one stable seven membered rings were formed by N atom(C=N) and O atom(C-O of COOH) with the rare earth(Ⅲ). The thermal decomposition of the ligand(C14H10N4O7) and the complexes (RE(C14H9N4O7)3?nH2 O) were carried out by DSC-TGA analysis at 5K/min, 10K/min and 15K/min respectively. The Kissinger’s method was used to calculate the apparent activation energies and dynamic parameters of the thermal decomposition stages of the ligand and the complexes, while Ozawa method not to do these of the complexes. The results showed that the activation energies (E) and correlation coefficient (r) of the ligand by the two methods are good linear relationships, and the ligand has a higher thermal decomposition temperature and the thermal stability than 3-aldehydosalicylic acid. Meanwhile, compared with the ligand, the higher thermal decomposition temperature and the thermal stability have been possessed by the complexes, which the apparent activation energies with the rare earth atomic number were changed in law. The biological activity of the ligand and three complexes (La(C14H9N4O7)3?2H2O, Gd(C14H9N4O7)3?3H2O, Yb(C14H9N4O7)3?3H2O) were carried out to Verticillium alboatrum reinke and Apple white mascardine fungi by the inhibition zone method, and to Escherichia coli and Bacillus subtilis by the minimal inhibitory concentration method, respectively. The results showed that the ligand and the complexes had certain bacteriostatic action on Verticillium alboatrum reinke and Apple white mascardine fungi at 60 hours, and no marked bacteriostatic activity against Escherichia coli and Bacillus subtilis.