ISSN:
1662-9752
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:
Superplastic forming processing of ceramic materials at high temperatures and highpressure puts forward very high requests to moulds and lubricants, at which conditions seeking forappropriate lubricants is one of important preconditions in the superplastic forming of ceramicmaterials. Using ring compressive testing, lubricities of hexagonal boron nitride in superplasticcompressive forming processing of 3Y-TZP/Al2O3 ceramic composite at elevated temperatures wereinvestigated. Theoretical curves of friction factor were drawn according to upper bound method. Ringcompressive tests were adopted at temperature of 1400 °C-1600 °C. The results indicate that whenBN is used, friction factor is about 0.4, meanwhile friction factor don’t have great changes with highertemperature and increasing strain rate. X-ray diffraction shows that under high temperature and highpressure no boron nitride converts to cubic phase, which remains at room temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.507.pdf
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