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Search Results for: coating

Total Search Results Found: 63

Characterization of the carbonization process of expandable graphite/silicone formulations in a simulated fire

Preventing steel from losing its strength during fires is crucial for safe evacuation and effective fire fighting. One of the most common protective coatings applied to steel and other construction materials today is intumescent paint. In this study, researchers created a potential new protective coating using a curable silicone base and varying volume amounts of expandable graphite between 5-25%. The key characteristic of these coatings is that they swell to create a foam in high temperatures to protect the structure. The swelling velocity, expansion %, and thermal conductivity of the experimental materials were measured to evaluate its effectiveness. Results showed that the silicone coating containing 25% expandable graphite provided better fire protection than the intumescent paint. A thermal analyzer was used to measure the thermal conductivity of the materials up to a temperature of 500°C. Extensive analysis of charring was performed after the experiment to understand how the compound reacted.

In-situ synthesis and attachment of colloidal ZnO nanoparticles inside porous carbon structures 

This study investigates the properties of a material to be used as an energy storage medium that can use energy stored from the summer months, and then release it during the winter. The proposed material uses a graphite foam, with ZnO coatings with a flower like morphology, to house a sugar alcohol phase change material (PCM). The thermal conductivity of the material was measured using a transient plane source (TPS) method.

Numerical investigation of the effect of interfacial thermal resistance upon the thermal conductivity of copper/diamond composites 

Diamond is an extremely conductive material that would be ideal for dissipating heat in microelectronics if it were not for its high price tag. In this study, cost effective copper- and chromium-diamond composites (uncoated (Cu/D), Cu-coated (Cu/CuD), and Cr-coated (Cu/CrD)) were produced to determine their potential use in heat sink applications. A Thermal Constant Analyzer measured the thermal conductivity of the matrix and composite samples using the transient plane source (TPS) method. Results showed that high diamond volume fractions were inversely related to thermal conductivities, whereas thermal conductivities increased with levels of copper and chromium coatings. Overall, a wide range of conductivities were obtained by coating diamond particles in conductive metals, and have potential applications in future microelectronics.

Thermal degradation and fire performance of intumescent silicone-based coatings

Intumescent paints protect steel structures from fires by creating insulative foams when heated above a critical temperature. This paper examines the fire resistance capabilities of phenyl silicone coatings in comparison to intumescent paints. A thermal constant analyzer measured the thermal conductivity of the silicone-based coatings using the transient plane source (TPS) technique. Results showed that the silicone/modifier coating consistently had lower thermal conductivities than the silicone coating. At heightened temperatures, the modifier created a thick insulative barrier which provided fire protection that was comparable to commercial intumescent paints.

Characterization of anisotropic and irregularly-shaped materials by high-sensitive thermal conductivity measurements

The transient plane source (TPS) technique has a wide range of applications because of its capability to test solids, liquids, powders, and anisotropic materials over a range of sizes. Thermal properties of thin films and coatings can also be characterized using the TPS method if the samples are placed between the sensor and a bulk background. To minimize errors with the TPS method, use identical materials on each side of the sensor, eliminate contact resistance between the probe and samples, and use a highly conductive material on side A of the sensor if insulating side B of the sensor as much as possible.