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Surface properties of laser-treated ceramic materials

机译：激光处理陶瓷材料的表面特性

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摘要

Laser surface treatment of high alumina refractory ceramics has been applied successfully to produce pore-free, homogeneous and crack-free surfaces. The treated surfaces should lead to an increase in the corrosion and erosion resistance of the materials, due to lower permeability to corrosive species and higher surface hardness, respectively. The corrosion resistance, in particular, can be influenced by the penetration of elements, contact characteristics and surface morphology of the treated surfaces in the service environment. Therefore, it is important to investigate the effect of laser treatment of ceramic materials on the interaction of the surface with the various environmental elements. This work is concerned with an experimental investigation of the water permeability, surface roughness and wetting characteristics of laser treated ceramic surfaces. Laser melted and re-solidified high alumina ceramic surfaces, some containing cracks and some being crack-free, are compared with untreated surfaces and the results are reported. It is found that the treated surfaces are smoother than the untreated surfaces. The untreated surfaces demonstrated considerable non-uniformity in wetting, in contrast to the treated surface. Wetting of the latter appeared to be higher. Water permeability through the treated zone was very small compared to that through the untreated surface, and, negligible in the case of crack-free surfaces.
机译：高氧化铝耐火陶瓷的激光表面处理已成功应用于生产无孔，均匀且无裂纹的表面。经过处理的表面应分别导致对腐蚀性物质的较低渗透性和较高的表面硬度，从而导致材料的耐腐蚀性和耐腐蚀性提高。特别是，在使用环境中，耐蚀性可能会受到元素渗入，接触特性以及处理过的表面的表面形态的影响。因此，研究陶瓷材料的激光处理对表面与各种环境元素相互作用的影响非常重要。这项工作涉及对激光处理的陶瓷表面的透水性，表面粗糙度和润湿特性的实验研究。将激光熔化和重新固化的高氧化铝陶瓷表面与未处理的表面进行比较，其中一些包含裂纹，而另一些则没有裂纹，并报告了结果。发现处理过的表面比未处理过的表面光滑。与经处理的表面相比，未经处理的表面表现出相当大的润湿不均匀性。后者的润湿性似乎更高。与未经处理的表面相比，经过处理的区域的水渗透率很小，在无裂纹的情况下可以忽略不计。

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