Effect of high-pressure vapor on the microstructure and mechanical properties of TiO2 continuous fibers. Issue 8 (15th April 2022)

• Record Type: Journal Article
• Authors: Wang, Lin; Xie, Yongshuai; Ma, Dehua; Zhu, Luyi; Wang, Xinqiang; Jin, Xiaotong; Peng, Ying; Zhang, Guanghui; Xu, Dong
• Is Part Of: Ceramics international. Volume 48:Issue 8(2022)
• Page Start: 10659
• Page End: 10666
• Publication Date: 2022-04-15
• Subjects: Titanium dioxide -- Fibers -- Strength -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.12.280
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: During the preparation of TiO2 continuous fibers, the organic ligands of the precursor fibers are severely decomposed and generated a large amount of gas, which can reduce the fiber matrix strength. Tt is necessary to choose a suitable treatment strategy to avoid this and obtain high-quality TiO2 continuous fibers. In this study, flexible continuous TiO2 fibers with a diameter of about 30 μm were prepared using a high-pressure vapor pretreatment method. The high-pressure vapor pretreatment caused precursor hydrolysis, which promoted the decomposition of the organic ligands in a mild way and prevented fiber fracture caused by the violent oxidative decomposition. The crystallization temperature decreased by 120 °C because of the synergistic effects of vapor and pressure. The hydrolysis of the precursor and the reduction in the crystallization temperature were conducive to the formation of compact fibers with high strength. However, the presence of water vapor caused the fibers to undergo the dissolution-precipitation process simultaneously, forming a large number of defects, which was harmful to its strength. The sample 1501 composed of anatase and rutile showed the highest average tensile strength of 385 MPa because it had fewer defects than the other samples. Although the highest average tensile strength is lower than the reported value of 800 MPa, the method is easy to implement and solves the problem of organics decomposition, which is helpful for industrial preparation.