喷涂角度对HVOF WC-Co-Cr涂层分布的影响

Influence of the spray angle on the WC-Co-Cr coating distribution produced by HVOF spraying

摘要:

在喷涂复杂形状部件时，喷涂焰流和基体表面几乎不可能固定一个角度。研究喷涂角度对涂层性质的影响是必要的。本文研究凹面曲率半径对沉积率的影响。实验使用团簇烧结的WC-10Co-4Cr粉末（粒径15~45μm）。实验时喷涂参数不变，喷涂半径为10,15,25mm的凹面。研究表明，喷涂角度严重影响涂层沉积率。喷涂角度减小导致沉积率减少。当喷涂角度少于30°.，涂层性质显著降低。涂层沉积分布和不同凹面半径的关系被推导。

Abstract:

Spraying complex shape parts, it’s almost impossible to maintain a fixed angle between spray flame and substrate surface. Studying the effect of spray angle on coating characteristics is necessary. The present study investigates the influence of the concave radius size on the deposition rate. As feedstock material an agglomerated and sintered WC-10Co-4Cr powder with a size distribution of 15 - 45 μm was used. For the spray experiments the process parameters were held constant, while the radii were selected of 10, 15 and 25 mm in concave profile. It has been generally shown that the spray angle has a great effect on coating deposition rate. The reduction of the spray angle results in a decrease of the deposition rate. A significant degradation of the coating properties was found less to 30°. The relationship between the coating’s distribution and spray angle with different curvature radius was deduced.