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:
Nanoparticles can be made into bulk material by sintering process in order to obtain someexcelled properties of nanomaterials. Because ZrO2 has a good thermal-resistance property, it hasbeen widely used as thermal-barrier material, including functionally graded material (FGM) andthermal barrier coating (TBC). In the present paper, ZrO2 nanoparticles with a size of 10, 50, 80 and100 nm were fabricated into bulk material respectively with the help of cold and isostatic pressingprocesses. The thermal diffusion coefficient, the hot expand coefficient and the specific heat ofthese bulk materials were measured. The experimental results showed that after ZrO2 nanoparticlesbeing pressed and sintered, the nanoparticles were found in a state of aggregation in the bulkmaterials, but there are some nanometer size effects in their thermal physic properties. It was foundthat the thermal diffusion coefficients between 100-150oC were obviously different, as the sampleswere made of ZrO2 with different nanometer dimensions. The less the nanometer size of particles,the higher the thermal diffusion coefficient. The hot expand coefficient of the sample from 100 nmZrO2 particles was 96.9741×10-7 K-1 between 30-300 oC. However, the hot expand coefficient of thesample from 10 nm ZrO2 particles was 100.2345×10-7 K-1. On the other hand, the specific heat ofthe bulk material from ZrO2 nanoparticles was much higher than that of the bulk material frommicron ZrO2 particles. When the temperature was over 350 oC, the size of ZrO2 nanoparticlesinfluenced the specific heat of bulk material even more. With the decreasing of size of ZrO2nanoparticles the specific heat of bulk material increased continuously
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1481.pdf
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