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Search Results for: coating

Total Search Results Found: 65

Properties and Performance of High-Purity Thermal Barrier Coatings

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 the aforementioned properties were studied with 7YSZ samples of varying purity. It was confirmed that using 7YSZ of the highest purity resulted in more favorable thermo-physical properties at high temperatures (1400 °C).

Thermal Conductivity of Coated Paper

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.

Determination of the Thermal Resistance of the Polymer-Ceramic Interface of Alumina-Filled Polymer Composites

In order to measure the thermal properties of polymer composites that are filled with ceramic powder the researchers created ‘macromodels’ that accurately modelled the interfacial resistance at each ceramic-polymer boundary. The macromodels were created by spin-coating the polymers onto sapphire wafers.

Synthesis of hollow silica nanospheres by sacrificial polystyrene templates for thermal insulation applications

In this paper, researchers synthesized monodispersed polystyrene spheres (PS), of a desired size. Generally, PS have a typical diameter ranging from 180 nm to 900 nm. However, the researchers in this study were able to reduce the sphere size, by increasing the polyvinylpyrolidone/styrene weight ratio. The PS were used as models, in order to fabricate hollow silica nanospheres (HSNSs), for thermal insulation applications. With modifications to this silica coating process, HSNSs experienced different surface roughness, however they all showed a thermal conductivity of about 0.02 W/mK.

Industrial development of high-entropy alloys

Traditional alloys are composed of approximately one to two major metal elements, such as aluminum, and titanium, etc. For the purpose of casting molds, new research has led to the creation of high-entropy (HE) alloys, that encompass five or more major metal elements. This research led to the discovery of lower thermal properties in HE alloys, portraying them as potential coatings in the management of casting molds. Low thermally conductive castings are required for the proper fabrication of thin and large area castings. The low thermally conductive nature of the HE alloys, allows the liquid to maintain its temperature, while slowing down the solidification process.