The present work describes the electroless deposition of Ni nanoparticles on micron sized (10 μm) boron carbide particles at room temperature. The weight of the boron carbide particles varied in relation to the other parameters during electroless deposition. A uniform and continuous nanolayer of Ni nanoparticles changed into a discontinuous layer, with irregular distribution and insignificant presence of Ni nanoparticles, as the weight of the boron carbide increased. The EDS measurement, elemental mapping and line scanning profile results showed a decrease in Ni percentage, as the weight of boron carbide increased in the samples. Further, FIB cross-sectional SEM images demonstrated a core-shell like structure of Ni coated boron carbide particle, when the weight of boron carbide was low in the sample. XRD showed the nanocrystalline nature of Ni-particles, and the presence of Ni, B and C elements was confirmed by XPS analysis. When thermogravimetric analysis was conducted in air atmosphere, the boron carbide, Ni nanoparticles and Ni-coated boron carbide samples exhibited oxidation at high temperature accompanied by weight gain. After being coated with Ni nanoparticles, even a small amount of Ni, the oxidation temperature of the boron carbide shifted to a lower temperature, with enhanced exothermic reaction as well as higher weight gain.

中文翻译：

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Ni纳米颗粒在微米级碳化硼颗粒上的化学沉积：物理化学和氧化特性

目前的工作描述了室温下 Ni 纳米颗粒在微米级 (10 μm) 碳化硼颗粒上的化学沉积。在无电沉积过程中，碳化硼颗粒的重量与其他参数有关。随着碳化硼重量的增加，Ni纳米颗粒的均匀连续纳米层变为不连续的层，Ni纳米颗粒的分布不规则且微不足道。随着样品中碳化硼重量的增加，EDS 测量、元素映射和线扫描轮廓结果显示 Ni 百分比下降。此外，FIB 横截面 SEM 图像表明，当样品中碳化硼的重量较低时，Ni 涂层碳化硼颗粒具有核壳状结构。XRD 显示了 Ni 颗粒的纳米晶体性质，并且通过 XPS 分析证实了 Ni、B 和 C 元素的存在。在空气气氛中进行热重分析时，碳化硼、Ni 纳米颗粒和 Ni 包覆碳化硼样品在高温下表现出氧化并伴随重量增加。包覆镍纳米粒子后，即使是少量的镍，碳化硼的氧化温度也会降低，放热反应增强，增重增加。