Fe含量及价态对玄武岩连续纤维结构及性能的影响研究

Basalt continuous fibers manufactured by natural volcanic rock is a kind of inorganic fiber with high performance. The main character of basalt fibers compared to other inorganic fibers is to contain about 10% Iron oxides. The valence state and concentration of iron ion in basalts varies greatly in different formation times and locations, which results in great different performance of basalts. It is very important to master and controllable adjust the effect of valence and content of Fe on the structure and properties of basalt fibers through the establishment of basaltic genome database. The properties of basalt fiber is improved by analyzing the influence of Fe redox index on the performance attenuation of basalt fibers, which plays the most important roles on improving the application of basalt fiber in concrete and related industries.. Through the establishment of bank of basalt genome and the precisely preparation of basalt fiber with different Iron oxide contents and valence status in the project, The effects of Fe redox index on the microstructure, mechanical performance and acid/alkali resistance of basalt fibers was researched systematically. by controlling effectively the redox index of Fe, the attenuation rules of humidity, temperature and atmosphere on the mechanical properties of basalt fiber is Clarified. By optimizing the aging environment, the tensile strength, elastic modulus, acid and alkali resistance of basalt fiber pristine increases respectively by 15%, 8% and 10%, which effectively promoted the application of basalt fiber.

玄武岩连续纤维是一种由天然的火山岩直接制备的无机高性能纤维，作为无机纤维的最大特点是含有约10%的Fe2O3。不同形成时期或地点的玄武岩中铁离子含量价态差别，导致了玄武岩纤维的性能差异性很大。建立玄武岩组分基因数据库，掌握并可控调整Fe价态和含量对玄武岩纤维结构及性能的影响至关重要。分析Fe含量及化合价对玄武岩纤维的性能及衰减规律影响，实现玄武岩纤维的性能增强，对提高玄武岩纤维在混凝土及相关应用有非常重要的意义。. 本项目通过玄武岩组分基因数据库的建立和玄武岩纤维Fe含量及价态的精密可控制备，系统研究Fe还原指数对玄武岩纤维结构、力学性能及耐酸碱性能的影响，通过有效控制玄武岩纤维中Fe还原指数，明确湿度、温度及气氛等对玄武岩纤维力学性能的衰减规律，通过优化老化环境，实现玄武岩纤维的拉伸强度和模量同比分别提高15%和8%，耐酸性和耐碱性同比提高10%,有效促进玄武岩纤维的应用。

玄武岩纤维是以玄武岩为主要原料制备的连续纤维，具有良好的力学性能、化学性能、耐温性能等特点而广泛应用于树脂基和混凝土基复合材料。玄武岩纤维含有10%的Fe氧化物，由于Fe有两种化合价态，不同价态的氧化物显著影响玄武岩纤维的结构和性能。本项目通过添加不同含量的碳粉、柠檬酸、硝酸盐等来调控Fe的价态及含量，借助XRD、FTIR、SEM、DSC、模斯堡尔普、高温黏度等性能测试，探究Fe的价态及含量对玄武岩纤维结构及性能的影响机制，明确了不同热处理温度及工艺对玄武岩纤维性能的影响酸碱规律，发现通过热处理实现玄武路由纤维拉伸及耐酸碱性的同比提高，为玄武岩纤维的应用提供新的途径。.本项目实施期间，成功利用掺杂剂实现对玄武岩纤维中Fe价态及含量的控制，并系统研究了不同Fe价态及含量对玄武岩纤维结构及性能的影响，发现其对玄武岩纤维的影响机制和作用机理，为提高玄武岩纤维的应用做了较多工作。.在项目实施期间，为国内11个地区的玄武岩进行组分分析和拉丝评价，参加了多个多次国际会议，并作多个学术报告，本文一共发表相关论文17篇，申请和授权专利16项。培养硕士研究生共8名。基于本项目分别获得2019年山东省重点研发计划项目支持和2021年国家科技部重点研发计划课题支持。

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