Mechanical Properties of Metal Oxide Aerogels
Mechanical Properties of Metal Oxide Aerogels
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DOI：
10.1021/acs.chemmater.7b03911
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发表时间：
2018-01-09
影响因子：
8.6
通讯作者：
Eychmueller, Alexander
中科院分区：
文献类型：
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作者：
Benad, Albrecht;Juerries, Florian;Eychmueller, Alexander
在这项研究中，我们报告的机械性能的成型，单组分Al 2 O3，Ga 2 O3，Fe 2 O3，ZrO 2以及混合气凝胶，由钇稳定氧化锆，钇铝石榴石，锌铝尖晶石。最初，所有的气凝胶都是通过简单的环氧树脂方法在模制体中同样生产的，然后在300摄氏度下退火。然后，我们进行单轴压力测试的圆柱形气凝胶整料，以获得杨氏模量，这取决于组成，密度，和后处理。已经纯气凝胶如ZrO 2显示出10.7 MPa的良好前景的杨氏模量，而最流行的SiO 2材料在相当的密度下显示出2和3 MPa之间的模量。此外，我们专注于氧化铝气凝胶，表现出高稳定性和有趣的致密化行为取决于退火温度。在此观察的基础上，我们通过添加高达20原子%的Zr，将Al 2 O3支架的韧性与ZrO 2的非凡硬度结合起来，以增加比杨氏模量。对于Zr含量为20原子%的混合材料，我们达到了125 MPa mL g（-1）的可压缩气凝胶的记录值。
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 degrees C. Then we performed uniaxial pressure tests on cylindrical aerogel monoliths to gain Youngs modulus which depends on composition, density, and post-treatment. Already pure aerogels like ZrO2 show well-promising Youngs 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 Youngs 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).