Effect of repeated usage on thermal insulation properties of fiber reinforced SiO2 aerogel materials

doi:10.3969/j.issn.1001-1935.2021.02.006

Refractories ›› 2021, Vol. 55 ›› Issue (2): 116-120.DOI: 10.3969/j.issn.1001-1935.2021.02.006

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Effect of repeated usage on thermal insulation properties of fiber reinforced SiO₂ aerogel materials

Tian Xiangyu¹⁾(), Han Yinlong¹⁾(), Zhou Liang¹⁾, Wu Qiong¹⁾, Shang Lei²⁾, Gao Qingfu³⁾, Zhang Bo¹⁾

1)AVIC Manufacturing Technology Institute,Beijing 100024,China

Received:2020-08-04 Online:2021-04-15 Published:2021-04-15

重复使用对纤维增强SiO₂气凝胶材料隔热性能的影响

田响宇¹⁾(), 韩银龙¹⁾(), 周粮¹⁾, 吴琼¹⁾, 尚磊²⁾, 高庆福³⁾, 张博¹⁾

1)中国航空制造技术研究院北京 100024
2)沈阳飞机设计研究所辽宁沈阳 110035
3)湖南荣岚智能科技有限公司湖南湘潭 411100

作者简介:田响宇:男,1992年生,硕士。 E-mail:tianxy_avic@163.com
基金资助:
中国航空制造技术研究院院基金项目(KS911810144);中国航空工业集团飞机新材料研发项目(KZ521905144)

Abstract

Abstract:

Fiber reinforced SiO₂ aerogel was studying object.The hot surface of a sample was heated by a quartz lamp with infrared radiation at 650 ℃ for 4 h.The influence of the reuse times (10,20,and 30) on the thermal insulation performance of the material was studied and the mechanism was analyzed.The results show that the thermal insulation properties of the fiber reinforced SiO₂ aerogel attenuate with the increasing reuse times.The temperature of the cold surface reaches 106 ℃ and even 124 ℃,respectively,when the hot surface of the specimen is reused for 10 times and 30 times.By analyzing the microstructure,composition,pore structure and specific surface area of the sample,it is found that during the reuse in hot and cold alternant conditions,silica aerogel nano particles grow up due to the sintering,and the specific surface area and total pore volume of the material are significantly reduced,which is why the thermal insulation performance attenuates with the increasing reuse times.

Key words: aerogel, thermal insulation materials, reuse

摘要：

以纤维增强SiO₂气凝胶为研究对象,采用石英灯红外辐射加热,将样品热面置于650 ℃的环境下保温4 h,研究了重复使用(10、20、30次)对材料隔热性能的影响并分析了相关机制。结果表明:随着重复使用次数的增加,纤维增强SiO₂气凝胶隔热性能发生衰减。重复使用10次,冷面温度为106 ℃;重复使用30次,冷面温度已经升高至124 ℃。通过对样品的显微结构、组成、孔结构和比表面积等分析发现:在冷热重复使用过程中,SiO₂气凝胶纳米颗粒会因烧结而长大,材料比表面积和总孔体积明显降低,这是导致隔热性能随着重复使用次数增加而发生衰减的主要原因。

关键词: 气凝胶, 隔热材料, 重复使用

CLC Number:

TQ427.26

Tian Xiangyu, Han Yinlong, Zhou Liang, Wu Qiong, Shang Lei, Gao Qingfu, Zhang Bo. Effect of repeated usage on thermal insulation properties of fiber reinforced SiO₂ aerogel materials[J]. Refractories, 2021, 55(2): 116-120.

田响宇, 韩银龙, 周粮, 吴琼, 尚磊, 高庆福, 张博. 重复使用对纤维增强SiO₂气凝胶材料隔热性能的影响[J]. 耐火材料, 2021, 55(2): 116-120.

Figures/Tables 8

Table 1 Main physical properties of fiber reinforced SiO2 aerogel insulation materials

项目	M	X
密度/(g·cm^-3)	0.32	0.25
热导率/(W·m^-1·K^-1)	0.023	0.020
最高使用温度/℃	800	650
质量吸湿率/%	0.5	0.5
线膨胀系数×10⁶/℃^-1	6	6
比热容/(J·g^-1·K^-1)	0.5	0.5

Fig.1 Pictures of sample to be tested

Fig.2 Diagrammatic sketch of quartz lamp infrared radiation heating device

Fig.3 Curve of cold surface temperature as a function of time after reuse

Fig.4 FI-IR curves of samples reused for different times

Fig.5 SEM images of samples reused for different times

Fig.6 Isothermal adsorption-desorption curves of different specimens

Table 2 Specific surface area and pore structure of samples

项目	M层				X层
项目	T0	T10	T20	T30	T0	T10	T20	T30
比表面积/(m²·g^-1)	184.02	95.24	81.58	71.85	152.02	126.27	122.06	109.44
总孔体积/(mL·g^-1)	1.79	0.75	0.69	0.52	1.58	1.33	1.11	0.98

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