ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Carbon-fibre, nickel-matrix composites exhibit excellent microstructural stability when the composites are isothermally annealed at temperatures to 1200° C for several hundred hours; morphological degradation of the reinforcing phase takes place at temperatures in excess of 1250° C. The degradation temperature is less than 1200° C when the composites are subjected to thermal cycling or temperature gradients. The mechanical properties of fibres extracted from annealed composites are approximately 40 to 50% less than the corresponding properties of unprocessed stressgraphitized fibres. Substantial mechanical property degradation occurs during the hotforming of nickel-coated fibres into dense shapes. Subsequent re-annealing of the dense composite results in additional fibre damage. Most of this additional degradation occurs within the first few minutes from the start of the anneal; prolonged isothermal annealing does not result in further property degeneration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00550674
Permalink