有机硅溶胶各组分含量对ZrH1.8表面涂层性能的影响  

Performance of Silica Sol Coating on ZrH_(1.8) with Different Component Contents

作　　者：吴明[1] 陈洋[1] 彭家庆[1] 闫国庆[1] 孙玉璞[1] 王力军[1] 

机构地区：[1]北京有色金属研究总院稀有金属冶金-9材料研究所,北京100088

出　　处：《稀有金属》2016年第11期1145-1153,共9页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51404034,51674035)资助

摘　　要：以硅酸乙酯（TEOS）、乙烯基三甲氧基硅烷（A171）、异丙醇（IPA）和去离子水（H2O）为主要原料制备有机硅溶胶，并采用溶胶-凝胶技术在氢化锆（ZrH1.8）表面制备了溶胶涂层。热失重-差热分析（DSC—TGA）显示，经180℃干燥或600℃烧结处理，涂层物质分别处于阶段稳定状态。通过单因素实验，考察溶胶各组分含量对溶胶粘度的影响，结合单次浸渍提拉涂层样品经180℃干燥和600℃烧结处理后增重率（WGR）及形貌变化，筛选出氢化锆表面制备涂层溶胶各组分最佳摩尔配比为nTEOS：nA171：nPA：nH2O=1：1：5：nH2O（nH2O=4．0～8．0），在此条件下所制备的溶胶，粘度范围为4．2～4．8mPa·S，180℃干燥涂层样品增重率范围为0．10％～0．12％，涂层表面均匀无裂纹，涂层厚度约为0．8～1．0μm；600℃烧结涂层样品增重率范围为0．16％～0．18％，涂层表面存在微裂纹，但无明显崩落，烧结过程伴随涂层致密化，涂层厚度约为0．6μm。Silica sol coating was prepared on the surface of zirconium hydride （ZrHl.s ） by sol-gel technology using ethyl silicate （TEOS） , vinyl trimethoxy silane （ A171 ） , isopropyl alcohol （IPA） and H2O as main raw materials. Differential scanning calorimetry- differential thermal analysis （DSC-TGA） showed that the material of sol coating was in stable state after drying under 180℃ or sintering under 600℃. Single factor experiment was conducted to study the effects of each component content on viscosity of the sol, weight gain rate （WGR） and morphology changes of single dip-coating samples heat treated under 180 and 600 ℃. The optimal components molar ratio for sol and coating on ZrHI s preparation was determined as nTEOS：nA171：nPA：nH2O=1：1：5： nH2O （ nH2O = 4. 0 - 8.0）. Viscosity of the sol with optimized ratio was in the range of 4.2-4.8 mPa ·S. WGR of single dip-coating samples dried at 180℃ was 0. 10%- 0.12%. Their coatings were even, crack-free and 0.8 - 1.0 μm thick. WGR of corresponding samples sintered at 600℃was 0.16%- 0.18%. And there were micro-cracks existed in the coatings but without severe fragmentation. Coating densification occurred in sintering process, and the final thickness was about 0.6 μm.

关 键 词：溶胶-凝胶 有机硅溶胶 涂层 氢化锆 形貌 

分 类 号：TB34[一般工业技术—材料科学与工程]