Comparison of some inverse heat conduction methods using experimental data

Influence of nano-LDHs on char formation and fire-resistant properties of flame-retardant coating

Flame-retardant nano-coatings have been prepared by adding nano-concentrates with nanometer layer double hydroxides (nano-LDHs) and nanometer titanium dioxide (nano-TiO2) to ammonium polyphosphate–pentaerythritol–melamine (APP–PER–MEL) coating. The dispersion and stability principle of nanoparticles is analyzed by using transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The effect of nano-LDHs and nano-TiO2 on the improvement in fire-resistant and anti-ageing properties of the APP–PER–MEL coating is investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), Differential thermal analysis (DTA), Thermogravimetry (TG) and fire protection test. The DTA and TG data show that the thermal decomposition of nano-LDHs at 310–430 °C is helpful to the char formation of the APP–PER–MEL system at 300–440 °C. The XRD and SEM data show that the thermal decomposition of nano-LDHs leads to the formation of an intercalated nanostructure of the char and mixed metal oxides (Al2O3 and MgAl2O4). The intercalated nanostructure can improve the anti-oxidation property of the char structure.

Accelerated ageing badly affects the chemical action and interaction of ammonium polyphosphate, pentaerythritol and melamine in traditional APP–PER–MEL coating, whereas the flame retardants in the nano-coating still have a very good interaction even after 500 h accelerated ageing. Nano-TiO2 can greatly improve anti-ageing properties of flame-retardant coating by its excellent ultraviolet-blocking power, and nanoscale interpenetrating network formed by uniformly dispersed nanoparticles can enhance the resistance of the coating to moisture in natural weathering.

Effect of nanoparticles on the improvement in fire-resistant and anti-ageing properties of flame-retardant coating

Temperature solution in multi-dimensional multi-layer bodies

Influence of expandable graphite on fire resistance and water resistance of flame-retardant coatings

Estimation of directional-dependent thermal properties in a carbon-carbon composite

This article discusses a laboratory method of measurement of the thermal properties of a carbon matrix carbon fiber composite material. Another important objective is the determination of the surface heat flux from measured temperatures within the body. This article is unique because the thermal properties are being estimated with known heat flux and temperature histories; then the opposite problem of recovering the heat flux history is solved using the estimated values for the thermal properties and temperature history. This calculated heat flux history can then be compared with the measured input heat flux. Results were obtained for a temperature range of 30-600 C. The thermal properties demonstrate a presumed quadratic relationship with temperature, and a good agreement between the estimated and measured heat flux histories is demonstrated. 18 refs.

K. Dowding

Papers

Estimation of directional-dependent thermal properties in a carbon-carbon composite

Estimation of Thermal Properties and Surface Heat Flux in Carbon-Carbon Composite

Estimation of thermal properties and surface heat flux in a carbon-carbon composite material