The air plasma spray (APS) technology is used to prepare WC/NiCrA1 and WC/NiCrBSi ceramic/metal composite wear protective coating on cast iron substrate, and the coating is measured for rnicrostmcture, microhardness, bond strength and slurry wear protective performance. and coating containing more WC is supreme than that containing less WC. Finally, wear mechanics and the principle of the coating's wear protective property are concluded, which are helpful for the design of wear protective coating.

The Ceramic/metal gradient thermal barrier Coating Design Software (CCDS) is developed for analyzing the heat transfer and the thermal stress in the coatings, and for designing the optimal coating schemes. The CCDS is developed according to software engineering methodology with Borland C builder 5.0 and has user friendly interface. it is composed of three functional modules preproccss module and post process module.initial data are input in the preproccss module, calculation of the temperature and thermal stress is carried out in the analysis module, and visualizatin is realized by the post proccss module. Calculation is carried out by analytical method. tinite difference method and finite element method. In addition, the CCDS is enhanced by attaching an optimization design module which completes optinization design for eeramic/metal gradient thernal barrier coatings by ANSYS Parameter Design language (APDL) or genetic algorithm. and an expert system module which may propose schemes and suggestions for coating design The CCDS is useful for the design of ceramic/metal gradient thenual battier coating.

建立了一个燃料电池堆过气箱的维结构模型，应用计算流体的力学软件分析流场场。描述了空气箱中的典型流动，同时经讨论了影响空气箱内空气流动的主要因素。通过研究进气箱结构形状及尺寸对箱内空气流动的影响。发现来用合适的扩压型进口加流线型挡块可以使空气箱出口处空气流速地比较均匀。

质子交换膜燃料电池的水、热、气管理对其性能和寿命有非常重要影响。本文重点讨论了水热、气管理主要措施和它们对电池性能的影响。分析表明，对质子交换膜燃料电池物理机制认识的不足是水、热、气管理水平低的原因，论文指出，应建立质子交换膜燃料电池的多尺度，多相，多埋场，动态仿真模型，进行分析，模拟和优化来提高其性能。

The themomechanical stress analysis aims at the thermal and mechanical response of LPG vessel under high thempeature environment. It includes the ealculation of temperature field and stress field of LPG vessel. The finite elements analysis software ANSYS is used to calculate the temperature field. The themal boundary conditions of LPG vessel are determined according to the heat transfer theory and calculated by the software PLGS99. The transient stress of LPG vessel includes transient thermal stress and transient mechanical stress. The thermal stress is calulated by applying thermal load, and the mechanical stress is calculated by applying pressure load of the steam in the vessel. The total stress is obtaince by adding the thermal stress and the mechanical stress. The reults show that the maximum stress in the vessel appears near the highest surface where the liquid cal reach, that the maximum cquivalent thermal stress is much larger than the maximum equivalent mechanical stress. and that the temperature gradient in longitude direction is the main reason that leads to the failure of the vessel.