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| Control of Thermal Conductivity of Basalt Fiber Thermal Insulation Composite Material |
| Received:November 30, 2021 Revised:February 18, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.03.011 |
| KeyWord:basalt fiber composite thermal conductivity bulk density needling density |
| Author | Institution |
| DAI Wen-hui |
Shanxi Diesel Engine Industry Co., Ltd., Datong , China |
| LI Hao-yu |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| PENG Xing |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| HUANG An-wei |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Zhong-sheng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| CONG Da-long |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| YI Tong-bin |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| WU Yong-peng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| SUN Cai-yun |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| DONG Ling-shu |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| TANG Jing-jing |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| GAO Shi-qing |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The purpose of this paper is to determine the influence factors and laws of thermal conductivity of basalt fiber thermal insulation composite, and to prepare basalt fiber thermal insulation composite with ultra-low thermal conductivity. Using the ultrafine basalt fiber needled felt as reinforcement and the ethyl orthosilicate (TEOS) as silicon source, the basalt fiber thermal insulation composite was prepared by acid/alkali two-step method and supercritical drying to study the effects of the mass ratio of basalt fiber, needling density of basalt fiber needled felt, and the nominal thickness of basalt fiber thermal insulation composite on the bulk density and thermal conductivity of basalt fiber thermal insulation composite. The results show that the bulk density and the thermal conductivity of basalt fiber thermal insulation composite (diameter:5 μm) decrease with the increase of its mass fraction; the bulk density of basalt fiber thermal insulation composite increases with the increase of the needling density of the basalt fiber needled felt, but its thermal conductivity decreases and then increases; the bulk density and thermal conductivity of basalt fiber thermal insulation composite increase slightly with the increase of its nominal thickness. When the mass fraction of basalt fiber (diameter:5 μm) is 100%, the needling density of basalt fiber needled felt is 160 needles/cm2, and the nominal thickness of basalt fiber thermal insulation composite is 2 mm, the bulk density of basalt fiber thermal insulation composite is the smallest, which is 98.1 kg/m3, and its equivalent thermal conductivity at 25 ℃ is the lowest, which is 0.0161 W/(m.K). |
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