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首页> 外文期刊>Journal of the European Ceramic Society >Plasma-sprayed graded ceramic coatings on refractory materials for improved chemical resistance
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Plasma-sprayed graded ceramic coatings on refractory materials for improved chemical resistance

机译：在耐火材料上进行等离子喷涂的梯度陶瓷涂层，以提高耐化学性

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摘要

Plasma-sprayed ceramic coatings were manufactured on sintered alumina-mullite refractor}' bricks to improve their chemical resistance to molten glass. Mullite and alumina powders were employed. Graded layered coatings were designed and produced, to reduce the thermal expansion mismatch with the substrate: in all cases, the upper layer consisted in pure alumina (very resistant to chemical attack); alumina-mullite intermediate layers were added to match the low thermal expansion of the porous substrates. Plasma-sprayed coatings definitely improved both the abrasion resistance and the chemical resistance to long-time (8 h at 1400 deg C) contact with molten glass, since the coating preserved its original microstructure. However, in thermal shock tests, some transverse cracks appeared; thus, thermal cycling tests in presence of molten glass indicated that, after a few cycles, the glass can penetrate down to these cracks. The tested samples were studied by means of scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) and X-ray diffraction (XRD).
机译：等离子喷涂的陶瓷涂层是在烧结的氧化铝-莫来石耐火砖上制造的，以提高其对熔融玻璃的化学耐受性。使用莫来石和氧化铝粉末。设计和生产渐变涂层涂料，以减少与基材的热膨胀失配：在所有情况下，上层均由纯氧化铝组成（非常耐化学腐蚀）;添加氧化铝-莫来石中间层以匹配多孔基材的低热膨胀。等离子喷涂涂料可以改善耐磨损性和与熔融玻璃长时间（在1400℃下接触8小时）的耐化学性，因为该涂料保留了其原始的微观结构。但是，在热冲击试验中，出现了一些横向裂纹。因此，在存在熔融玻璃的情况下进行的热循环测试表明，经过几个循环后，玻璃可以渗透到这些裂纹中。通过具有能谱仪（EDS）和X射线衍射仪（XRD）的扫描电子显微镜（SEM）研究了测试样品。

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