Abstract:

In this paper, the influence of the needle depth and frequency on the thermal insulation performance of pre-oxidised fibre felts was mainly investigated. The results showed that pre-oxidised fibre felts of a needle depth of 8 mm at a room temperature and working temperature of 100-200 °C had the best thermal insulation performance, while fibre for those of different needle depths with increasing temperature, the steady-state temperature difference increased linearly. With an increasing needle frequency, the thickness and gram weight of the pre-oxidised fibre felts showed a decreasing trend, while the coefficient of thermal conductivity exhibited an increasing one. For pre-oxidised fibre felts of different needle frequencies with increasing temperature, the steady-state temperature difference showed a linearly increasing trend.