摘要
通过化学镀方法制备了Ni-B合金涂层。经DSC和XRD分析确认该合金涂层在0℃～500℃之间有3种相变发生,分别形成不同种类的镍硼化合物。涂层硬度也因镍硼化合物种类不同而变化。特定的处理工艺使涂层显微硬度(HV)高达15000MPa以上。用原子力显微镜(AFM)对涂层表面观察发现,不同热处理的该合金涂层表面形态不同。表面形态的差异对涂层的硬度有影响。特别是当涂层中出现粒径为40nm～100nm、高度为10nm～20nm的突起物时,涂层的硬度会大幅提高,并对硬度提高的机制作了讨论。
Electroless plating was used to prepare Ni-B alloy deposits. It was confirmed with DSC and XRD analysis that three kinds of nickel borides are formed when the deposits are heated from 0degreesC to 500degreesC. An Atomic Force Microscope (AFM) was used to analyze the surface of Ni-B coating before and after treated in different processes. It was found that the microhardness is related to the surface topography of coating and the type of borides emerged in deposit. The microhardness HV can reach a value over 15 000MPa under certain heat treatment. In this case, nano-dimension protrusions with 40 nm similar to 100 nm in diameter and 10 nm similar to 20 nm in height were observed according to the microstructure. The mechanism of the microhardness increasing was discussed in detail.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期420-423,共4页
Rare Metal Materials and Engineering
