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Mechanical Properties of Metal Oxide Aerogels
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-12-22 00:00:00 , DOI: 10.1021/acs.chemmater.7b03911 Albrecht Benad 1 , Florian Jürries 2 , Birgit Vetter 2 , Benjamin Klemmed 1 , René Hübner 3 , Christoph Leyens 2 , Alexander Eychmüller 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-12-22 00:00:00 , DOI: 10.1021/acs.chemmater.7b03911 Albrecht Benad 1 , Florian Jürries 2 , Birgit Vetter 2 , Benjamin Klemmed 1 , René Hübner 3 , Christoph Leyens 2 , Alexander Eychmüller 1
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In this study we report on mechanical properties of molded, single component Al2O3, Ga2O3, Fe2O3, and ZrO2 as well as mixed aerogels, made from yttrium stabilized zirconia, yttrium aluminum garnet, and zinc aluminum spinel. Initially all aerogels were produced equally in molded bodies by a facile epoxy method and were annealed afterward at 300 °C. Then we performed uniaxial pressure tests on cylindrical aerogel monoliths to gain Young’s modulus which depends on composition, density, and post-treatment. Already pure aerogels like ZrO2 show well-promising Young’s modulus of 10.7 MPa, whereas most popular SiO2 materials display a modulus between 2 and 3 MPa at comparable densities. Moreover we focused on Al2O3 aerogels which exhibit high stability and interesting densification behavior depending on the annealing temperature. On the basis of this observation, we combined the toughness of the Al2O3 scaffold with the extraordinary hardness of ZrO2, by adding up to 20 atom % Zr, to increase the specific Young’s modulus. For the mixed material with a Zr content of 20 atom %, we reach a record value for compressible aerogels of 125 MPa mL g–1.
中文翻译：
金属氧化物气凝胶的机械性能
在这项研究中，我们报告了由钇稳定氧化锆，钇铝石榴石和锌铝制成的模制单组分Al 2 O 3，Ga 2 O 3，Fe 2 O 3和ZrO 2以及混合气凝胶的机械性能。尖晶石。最初，所有的气凝胶均通过简便的环氧方法在成型体中均等地生产，然后在300°C下进行退火。然后，我们对圆柱状气凝胶整料进行了单轴压力测试，以获得杨氏模量，该杨氏模量取决于成分，密度和后处理。像ZrO 2这样的纯气凝胶已经显示出很有前途的杨氏模量，为10.7 MPa，而最流行的SiO 2在相当的密度下，这些材料的模量在2到3 MPa之间。此外，我们专注于根据退火温度表现出高稳定性和有趣的致密化行为的Al 2 O 3气凝胶。基于该观察结果，我们通过添加多达20％（原子）的Zr，将Al 2 O 3支架的韧性与ZrO 2的非凡硬度相结合，以提高比杨氏模量。对于Zr含量为20原子％的混合材料，可压缩气凝胶的记录值达到125 MPa mL g –1的创纪录值。
更新日期：2017-12-22
中文翻译：
金属氧化物气凝胶的机械性能
在这项研究中，我们报告了由钇稳定氧化锆，钇铝石榴石和锌铝制成的模制单组分Al 2 O 3，Ga 2 O 3，Fe 2 O 3和ZrO 2以及混合气凝胶的机械性能。尖晶石。最初，所有的气凝胶均通过简便的环氧方法在成型体中均等地生产，然后在300°C下进行退火。然后，我们对圆柱状气凝胶整料进行了单轴压力测试，以获得杨氏模量，该杨氏模量取决于成分，密度和后处理。像ZrO 2这样的纯气凝胶已经显示出很有前途的杨氏模量，为10.7 MPa，而最流行的SiO 2在相当的密度下，这些材料的模量在2到3 MPa之间。此外，我们专注于根据退火温度表现出高稳定性和有趣的致密化行为的Al 2 O 3气凝胶。基于该观察结果，我们通过添加多达20％（原子）的Zr，将Al 2 O 3支架的韧性与ZrO 2的非凡硬度相结合，以提高比杨氏模量。对于Zr含量为20原子％的混合材料，可压缩气凝胶的记录值达到125 MPa mL g –1的创纪录值。
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