用白光散斑测量金属高温热变形的表面处理技术

The Surface Treatment for Measurement of High-Temperature Thermal Deformation of Metal by White-Light Speckle Method

探讨了不同温度的热过程中材料表面的白光散斑可测性，研究了金属表面氧化与散斑可测性之间的关系和抗高温氧化的实用方法，提出将热喷涂方法制备的防护层用于热变形的白光散斑测量。实验发现，以砂纸打磨的方式制备表面，可适用４００℃以下的热过程。基材表面火焰喷涂通用复合粉末所制备的防护层，可承受９００℃短期高温而保持散斑相关性，并可在７００℃下进行变形测量。表面预处理对基材机械性能的影响很小。

Presents a possible recognhability of white-light speckle on the surface of materials in the thermal process at different temperatures, studies on appropriate method for high temperature oxidation-resistance and the relation between the oxidation on metal surface and the speckle reeognisability. It also suggests the application of the protecting coating formed by heatspiaying method to the white-light speckle measurement of thermal deformation. It is found that for the thermal process lower than 400℃, the metal surface could only be prepared by sand paper polishing. The speckle interrelation on the coating formed by ordinary compound powder can be preserved at 900℃ for the chort time and be used to measure deformation at 700℃. The pre-treatment at the surface has little influence to the mechanical character of the base material.