溶胶-凝胶法制备超疏水性薄膜摩擦学性能的研究

doi:10.15541/jim20140421

摘要/Abstract

摘要：

采用溶胶-凝胶技术在铝表面涂覆氧化铝薄膜, 再利用长链脂肪酸对氧化铝薄膜进行疏水改性, 在金属铝表面构筑了具有较强减摩性能的超疏水薄膜。研究了沸水及水合肼溶液处理对氧化铝薄膜表面微纳织构的影响; 探讨了脂肪酸分子结构对薄膜静态和动态润湿性的影响, 利用球盘式微纳米摩擦磨损试验机评价了薄膜的摩擦学性能。结果显示, 水合肼溶液处理后的氧化铝薄膜经硬脂酸改性后不仅表现出超疏水性能, 而且具有较强的减摩性能。

关键词: 溶胶-凝胶, 铝, 超疏水性能, 减摩特性

Abstract:

A simple two-step process was developed in this study to render aluminum with lower friction and superhydrophobicity. Alumina film was firstly fabricated on aluminum by Sol-Gel technology. Fatty acid was then deposited on alumina film to endow superhydrophobicity. The surface morphology of alumina film after treatment using boiling water or hydrazine solution was evaluated. The effect of molecular structure of fatty acid on the wettability of the composite film was investigated. Friction-reducing behavior of the superhydrophobic films on aluminum was determined in a ball-on-plate configuration. It was found that the stearic acid film on alumina film treated by hydrazine solution showed superhydrophobicity and low friction, leading to significantly extending lifespan of the alumina film.

Key words: Sol-Gel, aluminum, superhydrophobicity, friction-reducing performance

中图分类号:

O647

万勇, 张泉, 李杨. 溶胶-凝胶法制备超疏水性薄膜摩擦学性能的研究[J]. 无机材料学报, 2015, 30(3): 299-304.

WAN Yong, ZHANG Quan, LI Yang. Tribological Performance of Sol-Gel Derived Superhydrophobic Film[J]. Journal of Inorganic Materials, 2015, 30(3): 299-304.

图/表 10

图1 铝表面氧化铝薄膜的XRD图谱

Fig. 1 XRD pattern of alumina film on aluminum

图2 铝(a)及铝表面氧化铝薄膜(b)的SEM照片

Fig. 2 SEM images of aluminum (a) and alumina films on aluminum (b)

图3 铝表面未处理氧化铝薄膜的动态润湿性

Fig. 3 Dynamic wettability of untreated alumina film on aluminum

表 1 硬脂酸改性不同氧化铝薄膜的润湿性

Table 1 Wetability of alumina films modified by stearic acid.

Alumina film	Contact angle /(^o)	Sliding angle /(^o)
Untreated	144	>20.0
Treated by boiling water	148	4.5
Treated by hydrazine hydrate	150	3.0

图4 沸水(a)及水合肼溶液(b)处理氧化铝薄膜的SEM照片

Fig. 4 SEM images of alumina film treated by boiling water (a) and hydrazine hydrate (b)

图5 硬脂酸改性不同氧化铝薄膜的IR图谱

Fig. 5 IR spectra for steraic acid on various alumina films

图6 铝及硬脂酸改性氧化铝薄膜的摩擦系数

Fig. 6 Friction coefficients of aluminum and alumina film modified by stearic acid

图7 硬脂酸改性氧化铝薄膜的磨痕SEM照片

Fig. 7 SEM images for alumina films modified by stearic acid (a) Untreated alumina film; (b) Alumina film treated by boiling water; (c) Alumina film treated by hydrazine

表 2 不同样品的表面润湿性

Table 2 Wetability of various alumina films

Alumina film	Hydrophobic agent	Contact angle /(^o)	Sliding angle /(^o)
	Stearic acid	144	>20
Untreated	Lauric acid	141	>90
	Oleic acid	134	>90
	Stearic acid	150	3
Treated by hydrazine hydrate	Lauric acid	146	5
	Oleic acid	143	9

图8 油酸、月桂酸或硬脂酸改性不同氧化铝薄膜的摩擦系数

Fig. 8 Friction coefficient for alumina films modified by oleic acid, lauric acid, or stearic acid

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