Thermal barrier coatings (TBC) are plasma sprayed onto gas turbine parts in order to improve combustion efficiency and component life time. Two TBC are looked at in this report: yttria partially stabilized zirconia (YPSZ) and dysprosia partially stabilized zirconia (DyPSZ). Both the TPS and laser flash techniques were used to measure the thermal conductivity of the coatings and the results were compared. In addition the effect of barrier microstructure on ...
Author(s): J. Wigren, N. Markocsan, P. Nylen, X.-H. Li
Yttria-stabilized zirconia (YSZ) powders containing varying amounts of SiO2 and Al2O3 impurities were plasma sprayed onto metallic substrates and subsequently investigated. The authors were interested in how the impurities affected sintering rates, thermal conductivity, linear contraction, and pore size and architecture among other things. The YSZ coatings were heat treated at 1400°C for 10 hours and then analyzed for the properties mentioned above. A machine was used to measure the ...
Author(s): A. Cipitria, I. O. Golosnoy, L. Xie, M. R. Dorfman, S. Paul, T. W. Clyne
In this paper, a thermally conductive insulated inorganic nanolayer of AlO(OH) was coated onto the surface of multi-walled carbon nanotubes (MWCNTs) to create a novel thermally conductive material. The coating of MWCNTs with this inorganic layer can effectively avoid the formation of electrically conductive networks in the Pi matrix and provides excellent thermal (conductivity) properties....
Author(s): James Economy, Jiarui Xu, Qianyi Wang, Shanxiong Xiao, Siwei Liu, Yi Zhang, Zhengping Qiao, Zhenguo Chi
In order to prepare more thermally resistant materials for use as thermal barrier coatings, the authors performed experiments on yttrium stabilized-zirconia (7YSZ) in order to investigate sintering resistance and phase stability at high temperatures. It was theorized that the main factor that affected the sintering resistance and phase stability at high temperatures was the concentration of impurities (Al2O3 and Si2O) present in the 7YSZ. Therefore in this report ...
Author(s): A. Cipitria, I. O. Golosnoy, L. Xie, M. R. Dorfman, S. Paul, T. W. Clyne
The thermal properties of coated paper are investigated and how those properties affect the other properties of the coated paper. Using the TPS system the authors are able to measure the thermal conductivity of coated paper samples. It was found that increasing coating mass led to a higher thermal conductivity which in turn led to a decrease in toner gloss and density....
Author(s): Hsin Wang, Lei L. Kerr, R. B. Dinwiddie, Robert C. Peterson, Yun-Long Pan
