This article features the oxidation behavior of ferritic stainless steel grade AISI 441 coated with protective polymer‐derived ceramics (PDC). Two PDC compositions are studied with respect to their oxidation resistance in a flow‐through atmosphere of synthetic air at temperatures of up to 1000°C. The coatings contain a combination of six passive fillers: Y‐containing ZrO₂, glass microspheres, alumina‐yttria‐zirconia (AYZ) powder, and three commercial glasses. They are pyrolyzed in air for 1 hour at 800°C with heating and cooling rates of 3 K/min. Detailed microstructural examination of the oxide products formed at the surface of samples after exposure to air at 900°C, 950°C, and 1000°C for 1‐48 hours is analyzed. Both uncoated steel and steel coated with two of the protective systems described in part 1 of this article are investigated. Fe, Cr₂O₃, TiO₂, and a spinel of the composition (Mn,Cr)₃O₄ are identified at the oxidized surface of the steel substrate using X‐ray diffraction. A significant weight gain of the unprotected steel is measured after all experiments, while oxidation tests of the coated steel show a negligible weight gain after 900°C and 950°C. During the early stages of coating oxidation, the monoclinic‐to‐tetragonal ratio in the zirconia filler is shifted toward the monoclinic modification. Longer exposures and higher temperatures lead to the formation of yttrium aluminum garnet (YAG) due to glass microsphere crystallization and solid state reactions in the AYZ powder. The crystallization of the three commercial glasses functioning as sealants leads to the formation of Ba(AlSiO₄)₂ also known as hexacelsian, which subsequently transforms to celsian. YZr₈O₁₄ is also formed. The protective effect of the PDC coatings applied to the stainless steel is demonstrated up to 950°C.

中文翻译：

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应用于AISI 441不锈钢的装有被动填料的聚硅氮烷衍生的玻璃/陶瓷涂层系统，第2部分：合成空气中的氧化行为

本文介绍了涂有保护性聚合物衍生陶瓷（PDC）的铁素体不锈钢等级AISI 441的氧化行为。研究了两种PDC成分在高达1000°C的合成空气流通气氛中的抗氧化性。涂层包含六种被动填料的组合：含Y的ZrO ₂，玻璃微球，氧化铝-氧化钇-氧化锆（AYZ）粉末和三块商用玻璃。它们在800°C的空气中以3 K / min的加热和冷却速率热解1小时。分析了在900°C，950°C和1000°C的空气中暴露1-48小时后在样品表面形成的氧化物产物的详细微观结构检查。本文的第1部分中描述的未涂覆钢和涂覆有两种保护系统的钢都已进行了研究。Fe，Cr ₂ O ₃，TiO ₂和组成为（Mn，Cr）₃ O ₄的尖晶石可以通过X射线衍射在钢基材的氧化表面进行鉴定。在所有实验之后，测得未保护钢的显着增重，而涂层钢的氧化测试表明，在900°C和950°C后，增重可忽略不计。在涂层氧化的早期阶段，氧化锆填料中的单斜晶与四方晶之比向单斜晶转变。由于玻璃微球的结晶和AYZ粉末中的固态反应，更长的暴露时间和更高的温度导致钇铝石榴石（YAG）的形成。用作密封剂的三种商用玻璃的结晶导致形成Ba（AlSiO ₄）_2，也称为六celscelian，随后转变为celsian。Z还形成了₈ O ₁₄。在高达950°C的温度下，PDC涂层对不锈钢的保护作用得到了证明。