ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Carbon fiber reinforced CMCs (ceramic matrix composites) are promising high temperaturestructural materials for aeronautical and astronautical industries. But the engineering application of thematerials strongly depends on the joining technique. As a fundamental research, high strength graphitecan be used to simulate carbon fiber. The study of wettability of graphite by liquid metals contributes tothe development of joining technique of carbon fiber reinforced CMCs. The wettability of graphite/Niplus Cr system was investigated using the sessile drop method. The contact angle was determined by hightemperature photography. The microstructure and composition of the interfacial zone were analyzed bySEM, EDX and XRD. The contact angle of graphite/Ni plus Cr system decreases with increasing the Crcontent. It becomes zero, when the Cr content reaches 50wt%. The wetting of graphite/Ni plus Cr systemis chemical wetting. The contact angle of the system decreases with increasing the wetting temperature orprolonging the holding time. The higher the Cr content, the more remarkable the effects of thetemperature and the holding time on the contact angle are. Microstructure and phase analysis reveals thatinter-diffusions and interfacial reactions take place in the wetting process. The reaction products includeCr3C2. The formation of Cr3C2 contributes to the interfacial bonding and results in the accumulation of Crin the interfacial zone
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1621.pdf
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