Abstract
Mullite has high creep resistance, low thermal expansion coefficient and thermal conductivity, excellent corrosion resistance and thermal shock resistance, and plays an important role in traditional ceramics and advanced ceramic materials. However, the poor mechanical properties of mullite at room temperature limit its application. In order to improve the strength and toughness of mullite, the current research focuses on the modification of mullite by using the second phase. The research status of discontinuous phase (particle, whisker, and chopped fiber) and continuous fiber reinforced mullite matrix composites is introduced, including preparation process, microstructure, and its main properties. The reinforcement mechanism of second phase on mullite matrix composites is summarized, and the existing problems and the future development direction of mullite matrix composites are pointed out and discussed.
Highlights
Mullite ceramics have higher creep resistance, good thermal shock resistance, and less strength attenuation at high temperatures, which has attracted the attention of scholars all over the world [1].In recent years, with the continuous progress and improvement of industrial technology, mullite refractories have developed rapidly and are widely used in aerospace, metallurgy, petroleum, chemical, and other industries
The monocrystalline whiskers mainly represented by SiC whiskers and mullite whiskers appeared in the 1990s have the advantages of few defects, high strength and large aspect ratio, and they have better reinforcement effect on mullite matrix than the second phase particles (SPPs)
It can be divided into slurry impregnation process, sol-gel process, pyrolysis (PIP) process, precursor infiltration, and chemical vapor infiltration (CVI) process according to different application forms
Summary
Mullite ceramics have higher creep resistance, good thermal shock resistance, and less strength attenuation at high temperatures, which has attracted the attention of scholars all over the world [1].In recent years, with the continuous progress and improvement of industrial technology, mullite refractories have developed rapidly and are widely used in aerospace, metallurgy, petroleum, chemical, and other industries. Mullite ceramics have higher creep resistance, good thermal shock resistance, and less strength attenuation at high temperatures, which has attracted the attention of scholars all over the world [1]. Mullite ceramics have excellent electrochemical and optical properties, such as broadband infrared and radar wave transmittance, etc. They can be used in electronic packaging, infrared wave transmittance, high-temperature optical windows, and other fields [2,3,4,5,6,7,8]. The poor mechanical properties of mullite ceramics at room temperature limit their application. Sarkar et al [9]
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