高温钢坯防氧化涂料用易熔玻璃粘结剂的制备及性能研究
文献类型：学位论文
| 作者 | 王叔华 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012-06-06 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 叶树峰 ; 魏连启 |
| 关键词 | 粘结剂 易熔玻璃 防氧化涂料 高温钢坯 粘结机理 |
| 其他题名 | Preparation and Performance of Low-melting Glass Adhesive Applied in Anti-oxidation Coatings for High Temperature Steel slab |
| 学位专业 | 化学工程 |
| 中文摘要 | 防氧化涂层对降低加热炉内钢坯的氧化烧损具有显著效果，近年来，随着连铸连轧工艺的发展，钢坯防氧化涂层技术的需求大增，并面临着一个致命的瓶颈问题，即涂料应用于红热钢坯表面时粘附性较差。本研究就钢坯防氧化涂层技术及相应的粘结剂做了较为系统的调研与综述，认为研究防氧化涂料用粘结剂具有举足轻重的意义。由于易熔玻璃可设计性强，它的软化熔融能将涂料粘结在红热高温钢坯界面上。因此本文采用易熔玻璃作为粘结剂，结合相图，选取P2O5-ZnO-Na2O和P2O5-CaO-Na2O系易熔玻璃作为研究对象。本研究采用高温熔融法制备易熔玻璃粘结剂，对粘结剂的密度、化学稳定性、 热稳定性能、高温粘结性能进行了表征，得到了两种红热高温钢坯防氧化涂料用粘结剂的最佳组成配方。 易熔玻璃粘结剂的实验结果表明：B2O3、Fe2O3对基础玻璃的改性提高了P2O5-ZnO-Na2O系玻璃的化学稳定性，MnO降低了其粘结温度，CoO及NiO不仅可提高粘结剂与钢坯基体的粘结性能，还降低了粘结剂在高温下对钢坯的腐蚀活性；BaO改性P2O5-CaO-Na2O系易熔玻璃，能提高玻璃的化学稳定性和热稳定性，降低高温腐蚀活性；两种体系的玻璃均具有部分水溶性，分别添加到陶瓷基防氧化涂料基料中，喷涂在红热普碳钢坯表面，在1250℃下的平均防氧化效果在50%左右。 本研究对易熔玻璃粘结剂在应用过程中的物理化学变化进行了表征，考察了易熔玻璃的加入对涂料基料防氧化性能的影响过程，发现易熔玻璃在应用过程中对钢坯基体的腐蚀活性可以通过调整界面处游离态P2O5等物质的含量来控制。结合易熔玻璃在应用过程中的物理化学变化，本研究从润湿、渗透、成键等因素对其高温粘结机理进行了分析，分析结果表明玻璃的软化熔融有助于流变的发生，同时也提高了涂料在红热钢坯表面的润湿性，粘结剂在760℃以上的钢坯界面上的润湿角小于10o；P2O5-ZnO-Na2O系粘结剂中的Co、Na、Mn、P可以渗透到氧化层中；P2O5-ZnO-Na2O系粘结剂中Zn2+、Ni2+、PO43-离子和红热钢坯表面的Fe2O3、Fe3O4反应成键，生成ZnFe2O4、NiFe2O4及FePO4。本研究结果表明，研制的易熔玻璃可以作为红热高温普碳钢坯防氧化涂料中的粘结剂使用，可解决连铸连轧工艺中热态钢坯与涂层粘附差的难题。 |
| 英文摘要 | Anti-oxidation coating has a significant effect to reduce the oxidation of steel slab in high temperature furnace. In recent years, with the development of continuous casting and rolling process, there is a bottleneck problem for anti-oxidation coating technology. The problem is the poor adhesion of coating with high temperature steel slab. So it is necessary to research the adhesives used in anti-oxidation coating. The application of anti-oxidation coatings for high temperature steel slab and adhesives were systematically reviewed. According to the requirement of coatings for plane steel at elevated temperature and phase diagram, P2O5-ZnO-Na2O and P2O5-CaO-Na2O glasses were chosen as the subject investigated. Two low-melting glass adhesives were prepared by conventional melt quenching technique. The density, chemical durability, thermal property, and adhesion property of adhesives were determined. Compositions of the adhesives used for anti-oxidation coating were determined. The experiment results showed that B2O3 and Fe2O3 could effectively prompt water durability of P2O5-ZnO-Na2O glasses, doping with MnO could extraordinary decrease the softening temperature, and doping with CoO/NiO could improve the adhesion properties of low-melting glasses and reduce the corrosion effect of adhesives at high temperature. Doping with BaO in P2O5-CaO-Na2O glasses could also improve water durability and reduce the corrosion effect of adhesives. These adhesives are kind of water-soluble low-melting glasses. The modified adhesives could be used as a binder, which provided a good adhesion for the ceramic coating on high temperature low-carbon steel substrate, and effect of oxidation resistance was about 50% in the experiment. When the ceramic coating with low-melting glass adhesive was sprayed onto the surface of high temperature steel slab, the physical and chemical changes were investigated. Oxidation performance of coated steel slab with the low-melting glass adhesive was also studied. We concluded the low-melting glasse adhesives had corrosion activity on steel billet. And corrosion activity of low-melt glasses could be controlled by the content of P2O5 during the application process. The reaction mechanism between the coating, glass binder and the iron oxides was elaborated from five parameters, including wetting, rheology, diffusion, infiltration, and bonding. The molten adhesive at high temperature steel slab lead to a rheology process, which is improved the wetting properties of the coating system at high temperature steel surface at the same time. The wetting angle of the low-melting glass at steel billet with the temperature above 760oC is 10o or less. Elements of Co, Na, Mn and P could penetrate into the oxide layer. Zn2+, Ni2+, and PO43- in the low-melting glasses could react with the Fe2O3 and Fe3O4 of the high temperature steel slab. The products of ZnFe2O4, NiFe2O4 and FePO4 were detected with XRD. The synthesized low-melting glasses can be used as the adhesive for anti-oxidation coatings, and the problem of poor adhesion between coating and steel slab at high temperature was solved. |
| 语种 | 中文 |
| 公开日期 | 2013-09-25 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1785]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 王叔华. 高温钢坯防氧化涂料用易熔玻璃粘结剂的制备及性能研究[D]. 北京. 中国科学院研究生院. 2012. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。