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采用还原气氛喷雾燃烧法制备了具有核壳结构Ni@C纳米复合颗粒,并与HDPE共混挤出制备了聚合物基PTC导电复合材料,并且对其结构和性能进行了表征.结果表明,所制备的Ni@C复合纳米颗粒具有典型的核壳结构,其中,金属镍的核的粒径为30~50 nm,碳包覆壳层的厚度约为2.9 nm,热重分析结果表明Ni@C复合纳米颗粒的含碳量为3.4%,碳包覆层的存在阻止了金属镍颗粒的团聚;对Ni@C/HDPE复合材料的断面SEM和切片TEM分析结果表明复合颗粒在HDPE基体中分散性良好,复合材料的渗流阈值为10wt%,PTC强度为8个数量级.
The Ni @ C nano-composite particles with core-shell structure were prepared by the reductive-atmosphere spray combustion method, and the polymer-based PTC conductive composites were prepared by blending and extruding with HDPE. The structure and properties of the composites were characterized. The prepared Ni @ C composite nanoparticles have a typical core-shell structure, in which the particle size of the metallic nickel nucleus is 30-50 nm and the thickness of the carbon-coated shell is about 2.9 nm. The thermogravimetric analysis shows that Ni @ C The carbon content of the composite nanoparticles was 3.4%. The presence of the carbon coating prevented the agglomeration of the metallic nickel particles. The cross-section SEM and SEM of the Ni @ C / HDPE composites showed that the dispersion of the composite particles in the HDPE matrix Good, composite material percolation threshold is 10wt%, PTC strength of 8 orders of magnitude.