Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites.
作者： Zhaoqiang Chen , Niansheng Guo , Lianggang Ji , Chonghai Xu
DOI: 10.3390/NANO9111522
关键词: Flexural strength 、 Ceramic 、 Fracture toughness 、 Silicon dioxide 、 Materials science 、 Coating 、 Transmission electron microscopy 、 Composite material 、 Composite number 、 Nanoparticle
摘要: In order to reduce the influence of CaF2 addition on mechanical properties self-lubricating ceramic tools, we applied a silicon dioxide (SiO2) coating calcium fluoride (CaF2) nanoparticles through hydrolysis and condensation reactions using tetraethoxysilane (TEOS) method. The powder was dried by azeotropic method, so that it acquired better dispersibility. resulting composite powders were characterized XRD (X-ray diffraction) TEM (transmission electron microscopy), showing surface coated with layer uniform compact SiO2. SiO2 shells different thicknesses could be obtained changing amount TEOS added, thickness controlled between 1.5 15 nm. At same time, material containing CaF2@SiO2-coated prepared. It had best when added; its flexural strength, fracture toughness, hardness 562 ± 28 MPa, 5.51 0.26 MPa·m1/2, 15.26 0.16 GPa, respectively. Compared tool nanoparticles, these increased 17.57%, 12.67%, 4.88%, greatly improved antifriction wear resistance material, balanced.
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