Ca0.6Mg0.4Zr4(PO4)6耐碱腐蚀涂层制备及其性能

采用溶胶-凝胶法和浸渍涂覆技术在堇青石基体上成功制备了Ca0.6Mg0.4Zr4(PO4)6涂层. 采用XRD, SEM等分析测试手段对涂层的物相组成、表面和断面形貌进行了分析. 结果表明，制备的涂层为单相的Ca0.6Mg0.4Zr4(PO4)6，涂层致密无裂纹，主要由粒径2~3 mm的颗粒组成，涂层与基体间结合良好，涂层具有较好的高温耐碱腐蚀能力，涂覆该涂层可显著提高堇青石基体的高温耐碱腐蚀能力，3次涂覆试样在1000℃下经96 h碱蒸汽腐蚀后，涂层结构完好，试样的质量损失和强度下降率分别为0.9%和10.2%，远低于未涂覆涂层试样的质量损失8.2%和强度下降率87.2%.

Study on Ca0.6Mg0.4Zr4(PO4)6 Coating with Alkali Corrosion Resistance

Ca0.6Mg0.4Zr4(PO4)6 coating on dense cordierite was prepared through sol-gel and dip-coating techniques. The phase composition and microstructures of coating surface and interface between coating and matrix were characterized by XRD and SEM. The results show that homogeneous, dense and crack-free Ca0.6Mg0.4Zr4(PO4)6 coating was successfully deposited on cordierite. The coating is single-phase Ca0.6Mg0.4Zr4(PO4)6 and composed of 2~3? mm spherical grains. SEM microstructural examination also revealed the excellent bonding between Ca0.6Mg0.4Zr4(PO4)6 coating and cordierite matrix. The assessment of coating alkali corrosion resistance was done through the measurements of weight loss and flexural strength degradation after 96 h alkali vapor corrosion at 1000℃, and the weight loss and flexural strength reduction are 0.9% and 10.2% respectively for the samples coated for three times, much less than those of uncoated cordierite, 8.2% and 87.2% respectively. The study shows that the Ca0.6Mg0.4Zr4(PO4)6 coating has good alkali corrosion resistance property and can greatly improve the high temperature alkali corrosion resistance of cordierite, and after 96 h alkali vapor attacking at 1000℃, the structure of the coating is almost not destroyed.