ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The oxidation behavior of tantalum diboride (TaB2) powder at high temperature wasinvestigated in order to determine the possibility of the use of advanced high temperature structuralmaterials. Unfortunately, monolithic TaB2 were known to be chemical stability up to hightemperatures. To date, there have been few reports regarding the properties of TaB2 ceramics. Thesamples were oxidized at room temperature to 1273 K for 5 minutes to 25 hours in air. The weightchanges were measured to estimate the oxidation resistance. The oxidation of samples oxidized forshort oxidation time of 5 minutes started at 873 K, and the weight gain increased with increasingoxidation temperature. On the other hand, at the oxidation time of above 1 hour, a maximum weightgain value at 973 to 1073 K was observed. However, even if the oxidation temperature was increasedan additional weight change slightly occurred. The weight gain of the sample oxidized at 1273 K for 5minutes to 25 hours was about 40 to 20 % of the theoretical oxidation mass change. According to thepowder X-ray diffraction date, the oxidized TaB2 sample was changed to Ta2O5 at 873 K. Finally, theTaB2 showed a good oxidation resistance at high temperature, because the surface film of tantalumoxide (Ta2O5) formed by oxidation acted as an oxidation resistant layer
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.819.pdf
