Open AccessFabrication and Properties of 3D Mullite Fiber-Reinforced Al2O3 Matrix Composites Prepared by Sol-Gel Process
Author(s) -
Guangren Geng,
Chang Ling Zhou,
Yuanyuan Zhou,
Kaiyu Wang,
Fanghong Yang,
Zhiqiang Cheng,
Futian Liu
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/678/1/012032
Subject(s) - materials science , mullite , composite material , microstructure , ceramic , flexural strength , sol gel , scanning electron microscope , fabrication , brittleness , medicine , alternative medicine , pathology , nanotechnology
Fiber toughening is an effective method to improve the brittleness of ceramic materials. In this paper, three-dimensional mullite fiber reinforced alumina ceramic matrix (3D mullite f /Al 2 O 3 ) composites were prepared by sol-gel process. Alumina sol was prepared by two ways in the inorganic aluminium salt method, and the alumina sol with good fluidity and high solid content was used as a precursor. The preparation process of alumina sol was studied by XRD and TGA-DSC. The results show that the sol is transformed into Al 2 O 3 at about 1100°C, and the crystal phase is α-Al 2 O 3 phase. The mechanical properties of the sample were analyzed by three-point bending test. The microstructure of the fractures was observed by scanning electron microscopy. The results show that with the increase of the immersion cycles, the density of composites increases continuously, and the toughening mechanism of continuous fiber extraction, interfacial debonding and crack deflection is fully utilized during fracture, which is characterized by ductile fracture behavior and achieved the purpose of toughening.