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Influence of heat treatment on microstructures and micro-hardness of n-SiO2/Ni composite coating 认领 引用
1
作者 XU Bin-shi WANG Hai-dou +2 位作者 DONG Shi-yun JIANG Bin TU Wei-yi 《中国有色金属学会会刊：英文版》 2004年第Z1期111-114,共4页
The n-SiO2/Ni composite electro-brush plating coating was prepared on the 1045 steel substrate. SEM and TEM were utilized to analyze the surface and cross-section morphologies or the microstructures of the composite c... The n-SiO2/Ni composite electro-brush plating coating was prepared on the 1045 steel substrate. SEM and TEM were utilized to analyze the surface and cross-section morphologies or the microstructures of the composite coating before and after heat treatment, as well as a micro-hardness tester was used to measure the micro-hardness before and after heat treatment. The results show that the entrance of nano SiO2 particles into composite coating makes the micro-hardness higher. After heat treatment, due to the obstruction to growth of Ni crystals from nano particles, the composite coating still possesses a higher micro-hardness than that of common Ni-base coating. 展开更多
关键词 nano SiO2 particles electro-brush plating composite coating heat treatment microstructures microhardness
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溶胶增强的化学Ni-P-SiO_2复合镀层 认领 引用 被引量：1
2
作者 刘雪华 雷华生 罗学恺 《闽江学院学报》 2019年第2期90-95,共6页
采用在基础Ni-P镀液中直接加入溶胶SiO_2的新形式,结合溶胶-凝胶法和化学镀方法,于45钢基材表面成功制备了均匀的复合Ni-P-SiO_2镀层,对比研究了复合镀层与基础Ni-P镀层的显微组织结构、耐磨及耐腐蚀性。结果表明,加入溶胶SiO_2所制备... 采用在基础Ni-P镀液中直接加入溶胶SiO_2的新形式,结合溶胶-凝胶法和化学镀方法,于45钢基材表面成功制备了均匀的复合Ni-P-SiO_2镀层,对比研究了复合镀层与基础Ni-P镀层的显微组织结构、耐磨及耐腐蚀性。结果表明,加入溶胶SiO_2所制备的复合镀层较Ni-P镀层具有更加均匀、致密的显微形貌。当SiO_2溶胶加入量为2.1×10-3 mol/L、煅烧温度为400℃时,复合镀层具有最高显微硬度值668.54 HV0.025,最低摩擦系数0.279,最正腐蚀电位-0.449 7 V及最小腐蚀电流0.632 7×10-6 A·cm-2。说明以该方法所制备的复合Ni-P-SiO_2镀层具有良好的耐磨、耐腐蚀性能,节省SiO_2原料用量,且不需要额外加入分散剂与稳定剂,减少长时间搅拌的能耗,对实际工业生产大有裨益。 展开更多
关键词 复合Ni-P-SiO2 溶胶SiO2 制备 耐磨及耐腐蚀性
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Zn-SiO_2复合涂层在水介质中的耐冲刷腐蚀性能 认领 引用
3
作者 于维平 孟林 《材料保护》 EI CAS 北大核心 2004年第8期12-13,16,共2页
渗锌钢不耐冲刷腐蚀 ,其应用受到了限制。在料浆渗锌涂层上采用溶胶 -凝胶法研究了制备SiO2 涂层的过程 ,获得了具有优异抗蚀性能的Zn -SiO2 复合涂层的新技术。EDS和XRD分析证明 ,Zn -SiO2 复合涂层的外层是一层较薄的非晶态SiO2 薄膜 ... 渗锌钢不耐冲刷腐蚀 ,其应用受到了限制。在料浆渗锌涂层上采用溶胶 -凝胶法研究了制备SiO2 涂层的过程 ,获得了具有优异抗蚀性能的Zn -SiO2 复合涂层的新技术。EDS和XRD分析证明 ,Zn -SiO2 复合涂层的外层是一层较薄的非晶态SiO2 薄膜 ,内层是与基体结合紧密的由FeZn11,FeZn9,FeZn7相组成的Zn -Fe合金层。在 4 0℃自来水中冲刷腐蚀 10 0h后 ,Zn -SiO2 复合涂层的腐蚀速率约是渗锌层的 1/ 2 0 ,2 0钢的 1/ 170。在 4 0℃ ,3.5 %NaCl溶液中冲刷腐蚀 10 0h后 ,Zn -SiO2 复合涂层仍然保持光泽的表面。电化学测试结果表明 ,渗锌涂层涂覆一层SiO2 薄膜后电极电位大幅度向正方向移动 ,是Zn -SiO2 复合涂层提高抗腐蚀性能的主要原因。 展开更多
关键词 Zn-SiO2复合涂层 渗锌钢 水介质 耐冲刷腐蚀
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Composite thermal protection coating on woven silica fiber fabrics 认领 引用 被引量：2
4
作者 LIU MengXia XUE Tao +2 位作者 ZHAO YingNa LIU Shan LIU JiaChen 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第6期1121-1126,共6页
A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio... A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,respectively.The phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetryhermogravimetry,scanning electron microscopy,and tensile strength testing.Mullite whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification processes.The hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics. 展开更多
关键词 silica fiber fabrics AlF3/SiO2 composite coating mullite whiskers
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