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Study on Mechanical and Thermal Properties and Stresses of Functionally Gradient Materials Produced by Laser Splaying

激光喷涂制备的功能梯度材料的机械和热性能及应力研究

基本信息

批准号：
03650064
负责人：
HANABUSA Takao
金额：
$ 1.28万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The present study investigated the residual stress state of the coating layers,of which the material was low carbon steel,stainless steel,alumina and titqnium nitride,deposited by laser-and plasma-spraying. X-ray stress measuring method was used to investigate residual stress on as-deposited layers, annealed surfaces and ground surfaces. Residual stress was tensile in all cases of various kind of deposited layers,but the stress value depended on depositing materials,substrate materials and splaying methods. There was little difference of the residual stress on the outermost surface between with and without a laminated structure in the deposited layer.Annealing at high temperature altered the residual stress state in metallic coating layer and the final state can be explained by the difference of the thermal expansion coefficient of the layer and the substrate materials. However,little change was observed in the case of ceramic(alumina)layer deposited by plasma spraying. The physical meaning of the X-ray stress should be investigated in the case of an alumina coating layer.Internal stress in a mono-layer and a laminated layer was analized by FEM calculation under the condition of a two-dimensional axi-symmetrical problem. It was found that the lamination does not largely contribute to a relaxation of the stress in the outermost layer but the difference of stress value through an interface of lamination becomes very mild in compering with the mono-layer structure.

研究了以低碳钢、不锈钢、氧化铝和氮化钛为材料，采用激光和等离子喷涂技术沉积的涂层的残余应力状态。采用X射线应力测量方法研究沉积层、退火表面和磨削表面的残余应力。各种沉积层的残余应力均为拉应力,但应力值取决于沉积材料、基体材料和铺展方法。沉积层中具有层状结构和不具有层状结构的最外表面的残余应力差异不大。高温退火改变了金属涂层中的残余应力状态，最终状态可以通过层与基体材料的热膨胀系数的差异来解释。然而，在通过等离子喷涂沉积陶瓷（氧化铝）层的情况下，观察到的变化很小。 X射线应力的物理意义应在氧化铝涂层的情况下进行研究。在二维轴对称问题的条件下，通过有限元计算分析了单层和叠层的内应力。发现层压对于最外层中的应力的松弛没有很大贡献，但是与单层结构相比，通过层压界面的应力值的差异变得非常轻微。