Abstract: Zirconia spheres were prepared as heat insulating filling by hydrothermal method, for increasing the heat-shielding performance, naphthalene nuclei were introduced into novolac epoxy resin which was used as matrix. Four samples with different contents of zirconia spheres were prepared to test their mechanical and heat-shielding properties. The experimental results indicate that the zirconia spheres are hollow spheres with around 500 nm diameter and coarse surface. The decomposition temperature of novolac epoxy resin is around 370℃. The suitable addition of zirconia hollow spheres in heat insulating coating for thermal batteries is 50%~60%(w). With 50%(w) zirconia hollow spheres, at room temperature, the tensile strength of heat insulating coating is 21.6 MPa, its shear strength 11.4 MPa, and thermal conductivity 0.05 W/(m×K), and at 300℃, its shear strength is 3.1 MPa, and thermal conductivity 0.04 W/(m×K).

Key words: zirconia hollow sphere, novolac epoxy resin, heat-insulating coating, thermal conductivity

摘要： 采用水热法制备ZrO2空心微球作为隔热填料，以萘改性的耐热酚醛环氧树脂为基体，制备了4种不同ZrO2含量的热电池隔热涂层，表征了其性能. 结果表明，所制ZrO2为直径约500 nm的空心球，表面粗糙；酚醛环氧树脂的热分解温度约为370℃，适宜的ZrO2空心球添加量为50%~60%(w). ZrO2含量为50%(w)时，室温下隔热涂层结合强度为21.6 MPa，剪切强度为11.4 MPa，热导率为0.05 W/(m×K)；300℃下隔热涂层剪切强度为3.1 MPa，热导率为0.04 W/(m×K).

关键词: ZrO2空心球, 酚醛环氧树脂, 隔热涂层, 热导率