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Improving anti-infrared radiation and heat insulation by potassium hexatitanate whisker-doped Al2O3–SiO2 composite xerogel

机译:六钛酸钾晶须掺杂的Al2O3-SiO2复合干凝胶改善了红外辐射的隔热性

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摘要

Taking potassium hexatitanate whisker (PTW) modified by silane coupling agent KH550, aluminium nitrate inorganic salt and tetraethyl orthosilicate and deionized water, respectively, as infrared sunscreen, aluminium source and raw materials forming the network structure of a composite xerogel, a series of structurally intact PTW-doped Al2O3–SiO2 composite xerogel thermal-insulating materials were prepared by the sol–gel method and dried under atmospheric pressure. The infrared spectral characteristics, infrared radiation transmittance, microstructures, morphology and thermal conductivity of different composite materials prepared have been determined by a Fourier transform infrared spectrometer, UV–visible–near-infrared spectrophotometer, X-ray diffractometer, scanning electron microscope and thermal conductivity tester. The results exhibit that when the Al to Si molar ratio is 1 : 9, the composite material with 5 wt% modified PTW shows the best infrared radiation blocking performance and the lowest thermal conductivity (0.0604 W m−1 K−1).
机译:以硅烷偶联剂KH550,硝酸铝无机盐,原硅酸四乙酯和去离子水分别改性的六钛酸钾晶须(PTW)作为红外防晒剂,铝源和形成复合干凝胶网络结构的原料,一系列结构完好溶胶-凝胶法制备了掺杂PTW的Al2O3-SiO2复合干凝胶绝热材料,并在大气压下干燥。使用傅立叶变换红外光谱仪,紫外可见近红外分光光度计,X射线衍射仪,扫描电子显微镜和导热系数测定了所制备的不同复合材料的红外光谱特性,红外辐射透射率,微观结构,形态和导热系数。测试员。结果表明,当Al / Si摩尔比为1:9时,改性PTW含量为5 wt%的复合材料具有最佳的红外辐射阻挡性能和最低的导热率(0.0604 W m -1 K -1 )。

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