以Ti，Al和C粉末为原料，采用接触反应法制备原位TiC颗粒增强的铸造Al2Cu复合材料，研究了反应温度对反应产物的影响，探讨了TiC颗粒的形成机制。结果表明，随着反应温度的升高，副产物TiAl3和Al4C3生成的可能性减小；当反应温度为900℃时，反应副产物全部转变为TiC，且原位反应生成0.5～1.5μm的TiC颗粒均布于α2Al基体中；TiC的加入能显著提高基体的强度，特别是高温强度，但使其延伸率有所下降。

The thermal degradation behaviour of polyacrylate and its zinc oxide composites were investigated by differential scanning calorimetry (DSC), thermogravimetry (TG) and Fourier transform infrared spectroscopy (FTIR). Reaction mechanisms of polymer degradation with and without ZnO particles were obtained. Filler-free polyacrylate exhibited one DSC peak, indicating that the polymer was degraded with only one stage of weight loss. Polyacrylate/ZnO composites underwent two minor weight losses as well as the major weight loss. ZnO stabilized or destabilized the polymer molecules according to the temperature region. Two mechanisms were proposed for the change of thermal properties of the nanocomposite. An increase of the stabilization or destabilization effect of ZnO nanoparticles was found in the nanocomposite with a higher content of the inorganic phase. Compared to micron ZnO particles, ZnO nanoparticles exhibited a greater effect due to their high specific area giving more sites for interactions. In addition, kinetics of thermal degradation of filler-free polyacrylate and polyacrylate/ZnO composite were quantitatively obtained by means of non-isothermal weight loss data analysis.

The oxidation kinetics and mechanism of gradient SiC coating/3D carbon fiber braid (coated braid, CB) in static air were studied through isothermal oxidation-weight loss, non-isothermal thermogravimetric (TG) and differential thermogravimetric (DTG) also. The results showed that the oxidation process of CB in isothermal condition was reaction-controlled in the first step and, gas diffusion and reaction-controlled in the second step. In non-isothermal condition, the characteristic of oxidation process was self-catalytic. The oxidation mechanism was one-dimensional diffusion. The kinetic parameters were: log A (min-1)=10.12 and Ea (kJ mol-1)=224.96.

研究了Al2O3陶瓷从室温至1200℃在干摩擦条件下的高温摩擦磨损行为。结果表明：在600℃以后的摩擦磨损随温度上升而逐渐减小。在1200℃的摩擦系数仅为室温的60%，磨损则降低了两个数量级。表现出良好的高温自润滑特征。在不同温度下，存在三种显著不同的磨损机理。从室温至600℃，主要是磨粒磨损和微断裂，磨损随温度上升而略有增加。在600～1000℃，磨损机理逐渐由脆性断裂过渡到塑性变形和再结晶，在表面形成一个厚度为5～10μm的、类似于纳米材料结构的特殊表面层。随着这种特殊表面层的形成。磨损显著下降。在1200℃，摩擦表面由塑性变形发展到软化状态，出现流体动力润滑，使摩擦磨损进一步降低。

本文对原位反应合成的C-SiC-TiC-TiB2复合材料在600-1200℃空气中的抗氧化性进行了研究。在不同材料组成和试验温度下，试样分别出现氧化增重和失重，这主要取决于碳相和陶瓷相的氧化速率及氧化层的结构特征。在600℃该材料几乎不被氧化；800℃时，TiB2被优先氧化，形成B2O3液相；在1000℃以上，B2O3与SiO2生成硼硅酸盐玻璃，形成一致密氧化层。氧化过程中液相的出现和致密氧化层的形成显著降低了氧化速率，使材料进入钝氧化，从而大幅度地提高了该材料的抗氧化能力。