Thermal insulation of 3D printed complex and miniaturized SiO2 aerogels at medium-high temperatures

3D 打印的复杂和微型化 SiO₂ 气凝胶的中高温隔热研究

Yuting Wang, Chengyi Chu, Chengqi Duan, Jiajing Dong, Hao Chen, Songtao Ying, Jianjun Guo, Gaojie Xu, Yuchuan Cheng*, Aihua Sun* 

王雨婷，储成义，段琛祺，董嘉靖，陈浩，应松涛，郭建军，许高杰，程昱川*，孙爱华*

全文下载：Journal of Non-crystalline Solids, 2023, 608, 12251

Abstract

    SiO₂气凝胶具有优良的隔热性能，但机械性能，通过传统制造方法精确生产微型物体和复杂形状物体具有挑战性。 我们使用 3D 打印来制造 SiO₂ 气凝胶，并同时添加遮光剂来降低气凝胶的中高温导热性能。 打印的SiO2气凝胶在室温下的导热系数低至0.028 W/(m·K)。 掺杂 10 wt% SiC 的气凝胶在中高温下具有最好的隔热性能，打印后期压缩模量达到1.19 MPa，比普通气凝胶提高10倍以上。 本文工作提供了一种使用直接墨水书写 (DIW) 创建具有出色中高温隔热性能的微型物体和复杂形状物体的方法。

Due to aerogel's network structure, specific surface area, and high porosity, SiO2 aerogel has excellent thermal insulation and inferior mechanical properties. It is challenging to produce micro-objects and complex-shaped objects accurately by traditional manufacturing method because of the fragile mechanical properties. Here, we use 3D printing to fabricate SiO2 aerogels. At the same time, we add opacifiers to reduce the aerogel's medium-high temperature thermal conductivity. The thermal conductivity of the SiO2 aerogel printed in the experiment is as low as 0.028 W/(m·K) at room temperature. The aerogel doped with 10 wt% SiC has the best thermal insulation at medium-high temperatures. And the 3D printed aerogel doped with 10 wt% SiC has a compression performance of 1.19 MPa, which is more than 10 times better than the usual aerogel. This paper provides a method for creating micro-objects and complex-shaped objects with excellent medium-high temperature thermal insulation using Direct Ink Writing (DIW).