Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 578, Issue -, Pages 287-293Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.04.089
Keywords
Microstructure; Mechanical properties; Mullite fiber; Heat-treatment
Categories
Funding
- National Natural Science Foundation of China [51202291]
- Aid Program for Innovative Group of National University of Defense Technology
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
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The composition and microstructure of Nitivy ALF 2880D fibers after heat-treatment at elevated temperatures are investigated by XRD, FT-IR, SEM and TEM analyses. Tensile properties of as-received and heat-treated fiber bundles have been studied. The results show that as-received fibers consist of gamma-Al2O3, amorphous silica, and a little boron oxide. During heat-treatment process, boron oxide firstly melts and flows, resulting in large amount of liquid ravines, and then volatilizes, leaving several holes on fiber surface. Reaction between gamma-Al2O3 and amorphous silica begins when heat-treated temperature is above 1100 degrees C, and completes at 1300 degrees C. As heat-treated temperature increases from 1100 degrees C to 1400 degrees C, grain growth of mullite starts and leads to the reduction of room temperature tensile strength of fibers. Tensile strength of fibers stays stable when heat-treated temperature is below 1200 degrees C, while the strength retention of fibers sharply decreased to 50% after heat-treatment at 1300 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
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