ZrC-SiC closed-cell ceramics with low thermal conductivity:Exploiting unique spherical closed-cell structure through tape casting and CVI techniques
作者机构：Science and Technology on Thermostructural Composite Materials LaboratoryNorthwestern Polytechnical UniversityXi’an 710072China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2024年第184卷第17期
页 面：101-110页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the National Natural Science Foundation of China(Grant Nos.52072304,51872229,and 52172100) the 111 Project of China(No.B08040) Science Center for Gas Turbine Project(No.P2022-B-IV-002-001)
主 题：Closed-cell ceramics UHTCs Thermal insulation ZrC hollow microspheres CVI Interfacial thermal resistance
摘 要：Porous ultra-high temperature ceramics(UHTCs)are recognized as novel candidates for fulfilling the requirements of thermal protection systems of hypersonic aircrafts,as they possess excellent high-temperature resistance and low thermal ***,the reported porous UHTCs predominantly exhibit an open pore *** contrast,closed-cell UHTCs,formed by employing ceramic hollow microspheres(HMs)as pore-forming agents,hold great potential for achieving superior thermal insulation ***,the implementation of this strategy has been hindered by the scarcity of raw materials and preparation *** this paper,ZrC-SiC closed-cell ceramics were first successfully prepared through a combination of tape casting and chemical vapor infiltration(CVI)techniques,utilizing the self-developed ZrC HMs as the primary raw *** morphology,microstructure,and thermal insulation properties of the obtained ZrC-SiC closed-cell ceramics were *** results indicate that when the content of ZrC HMs is 30 vol.%,the density of the prepared porous ceramics is 2.09 g cm^(-3),with a closed porosity of 14.05%and a thermal conductivity of 1.69 W(m K)^(-1).The results clearly prove that the CVI process can successfully convert ZrC HMs into closed pore structures within porous *** introduction of ZrC HMs suppresses the contribution of free electrons to thermal conductivity and brings about a large number of solid-gas interfaces,which increases the interfacial thermal resistance and significantly reduces the phonon thermal ***,the as-prepared ZrC-SiC closed-cell ceramics show excellent thermal insulation *** study provides a new idea and method for the development of porous UHTCs and offers a more reliable material choice for thermal protection systems.
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