Kiurski Jelena S, Ranogajec Jonjaua G, Ujhelji Agnes L, Radeka Miroslava M, Bokorov Milos T
University of Novi Sad, Faculty of Technical Sciences, Novi Sad, Serbia and Montenegro.
Scanning. 2005 May-Jun;27(3):113-9. doi: 10.1002/sca.4950270302.
The effect of the actions of some lichens on the quality of ceramic roofing tiles was investigated in view of textural and microstructural changes considering their biocorrosion resistance. Two types (extruded and pressed) of the real ceramic roofing tiles aged 6 to 10 years, as well as the ceramic model systems formed with the additives of the specific chemical composition Cu-slag powder (10 wt%) and CuO powder (1 wt%), treated with various concentrations of oxalic acid (0.01 wt%, 0.1 wt%, and 4 wt%) were investigated. The thalli of lichen (Verrucaria nigrescens) growth on ceramic roofing tile were examined by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Investigation by SEM and EDS gave information regarding the ultrastructure characteristics of the thallus and the lichen-ceramic tile contact zone, allowing the observation of the hyphal penetration and filling up of the fissures and cracks by the lichens' hyphae. The CuO as the raw mixture additive changed the quality of the surface of the ceramic model systems as it has increased resistance to oxalic acid actions. The textural changes in the ceramic model systems and the formation of the identified destructive crystal phase, whewellite, were slowed down. The fundamental interactions between lichens and ceramic materials of the model systems have been identified as physico-chemical processes based on oxalic acid actions, which could cause ceramic matrix deterioration and consequently aging of ceramic roofing tile systems.
考虑到某些地衣的作用对陶瓷屋面瓦质量的影响以及其耐生物腐蚀性能，对其纹理和微观结构变化进行了研究。研究了两种类型（挤压型和压制型）、使用年限为6至10年的真实陶瓷屋面瓦，以及添加了特定化学成分的铜渣粉（10 wt%）和氧化铜粉（1 wt%）并经不同浓度草酸（0.01 wt%、0.1 wt%和4 wt%）处理的陶瓷模型系统。通过扫描电子显微镜（SEM）和能谱仪（EDS）对地衣（黑疣衣）在陶瓷屋面瓦上的菌体进行了检查。SEM和EDS研究提供了有关菌体超微结构特征以及地衣与陶瓷瓦接触区域的信息，从而能够观察到地衣菌丝对裂缝和裂纹的穿透及填充情况。作为原料混合物添加剂的氧化铜改变了陶瓷模型系统的表面质量，因为它增强了对草酸作用的抗性。陶瓷模型系统中的纹理变化以及已识别出的破坏性晶相——水草酸钙石的形成速度减缓。模型系统中地衣与陶瓷材料之间的基本相互作用已被确定为基于草酸作用的物理化学过程，这可能导致陶瓷基体劣化，进而使陶瓷屋面瓦系统老化。
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