Al_(2)O_(3)-SiO_(2)-B_(2)O_(3)连续纤维的制备及力学性能  

Preparation and Mechanical Properties of the Al_(2)O_(3)-SiO_(2)-B_(2)O_(3) Continuous Fibers

作　　者：贾玉娜[1] 梁可可 焦秀玲[1] 陈代荣[2] 张剑[3] 吕毅[3] 赵英民[3] JIA Yuna;LIANG Keke;JIAO Xiuling;CHEN Dairong;ZHANG Jian;LYU Yi;ZHAO Yingmin(National Engineering Research Center for Colloidal materials,Shandong University,Jinan 250100,China;School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China;Institute of Aerospace Special Materials and Technology,Beijing 100074,China)

机构地区：[1]山东大学国家胶体材料工程技术研究中心,济南250100 [2]山东大学化学与化工学院,济南250100 [3]航天特种材料及工艺技术研究所,北京100074

出　　处：《材料导报》2021年第14期14025-14029,共5页Materials Reports

摘　　要：本实验采用溶胶-凝胶法结合干法纺丝制备了氧化铝基凝胶连续纤维,煅烧后得到含12.92%B_(2)O_(3)、24.56%SiO_(2)和62.50%(均为质量分数)Al_(2)O_(3)的氧化铝基陶瓷连续纤维。通过TG-DSC、SEM、TEM、XRD和强度拉伸仪等分析手段研究了前驱体溶胶的微观结构、纤维晶相组成以及纤维表面和内部结构。结果表明,通过溶胶-凝胶法制备的前驱体溶胶可纺性优良,性质稳定。采用干法纺丝得到的氧化铝基凝胶连续纤维长度可达上千米,将凝胶纤维进行陶瓷化后形成的含硼氧化铝基陶瓷连续纤维直径均匀,为14~15μm,经1000℃煅烧后纤维主晶相为莫来石相,拉伸强度最高可达1.35 GPa。本实验所制备的氧化铝基陶瓷连续纤维具有优良的力学性能,在热防护领域具有广阔的应用前景。In the present work,alumina-based gel fibers were prepared through sol-gel method combined dry-spinning technology,which transformed to the continuous alumina ceramic fibers with the composition of 12.92wt% B_(2)O_(3),24.56wt% SiO_(2) and 62.50wt% Al_(2)O_(3) after calcination.Thermogravimetric-differential scanning calorimeter(TG-DSC),scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD)and mechanical property analytical techniques were applied to investigate the microstructure of the sol precursor,the phase composition of the fibers,as well as the surface and internal structure of the fibers.The results indicate that the sol precursor prepared through the sol-gel method has excellent and stable spinability,and the gel fibers with the length longer than 1000 m can be obtained by dry-spinning.After calcination,B-containing continuous alumina ceramic fibers with the uniform diameter of 14-15μm were formed.With the calcination temperature of 1000℃,the main crystalline phase in the fibers is mullite,whose tensile strength can reach up to 1.35 GPa.The as-prepared continuous alumina ceramic fibers have excellent mechanical properties,which show great potential in the field of thermal protection.

关 键 词：氧化铝基连续纤维 氧化硼 溶胶-凝胶法 干法纺丝 

分 类 号：TB321[一般工业技术—材料科学与工程]