超细玻璃纤维棉毡的形貌结构及导热系数研究OA

Scanning electron microscopy(SEM)and mercury intrusion porosimetry(MIP)were employed to de-termine the morphological structure parameters of the two types of ultra-fine glass fiber wool felts,the impact of tem-perature variations on the thermal conductivity of both wool felts was investigated using transient plane source(TPS)method.The findings reveal that the wool felt No.1 has a smaller average fiber diameter(3.36 μm),higher porosity(95.51%),larger total pore volume and area(0.013 2 m3/kg and 1 270 m2/kg,respectively);in contrast,the wool felt No.2 has a larger average fiber diameter(6.27 μm),with porosity,total pore volume,and total pore area of 93.61%,0.008 3 m3/kg,and 669 m2/kg,respectively.At a test temperature of 273.15 K,the average thermal con-ductivities of wool felts No.1 and No.2 are 0.025 7 W/(m·K)and 0.030 7 W/(m·K),respectively.As the test tem-perature increases,molecular thermal motion accelerates,resulting in an increasing trend in the thermal conductivity of both wool felts.At 393.15 K,the average thermal conductivities of wool felts No.1 and No.2 increase to 0.037 0 W/(m·K)and 0.043 3 W/(m·K),respectively.Additionally,due to its smaller fiber diameter,higher porosity,larger total pore volume and area,the wool felt No.1 consistently exhibits lower thermal conductivity and better thermal insu-lation performance than wool felt No.2.This study provides theoretical and data support for the application of ultra-fine glass fiber wool felts in engineering thermal insulation.