( 湖南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410082)
摘 要: 對CVD法制備的碳納米管進(jìn)行了表面改性和修飾, 然后通過化學(xué)共沉積方法制備了高硬度的碳納米管復(fù)合鍍層, 并研究了碳納米管復(fù)合鍍層在不同摩擦組合下的摩擦學(xué)行為。 結(jié)果表明： 經(jīng)過改性處理后的碳納米管表面擁有豐富的表面官能團(tuán), 這使大量的碳納米管復(fù)合于鍍層中, 從而導(dǎo)致了鎳磷復(fù)合鍍層的硬度顯著提高, 達(dá)到946 HV。 摩擦實(shí)驗(yàn)得出, 在潤滑狀態(tài)下以鋼環(huán)為摩擦副, 碳納米管增強(qiáng)的鎳磷復(fù)合鍍層比傳統(tǒng)耐磨材料SiC增強(qiáng)的鎳磷復(fù)合鍍層具有更低的摩擦系數(shù)和磨損率。 此外, 不同摩擦組合下的摩擦結(jié)果表明, SiC復(fù)合鍍層相互摩擦?xí)r盡管擁有較低的磨損率, 但其摩擦系數(shù)仍然較高, 而碳納米管復(fù)合鍍層相互摩擦?xí)r表現(xiàn)出最低的摩擦系數(shù)和磨損率, 其摩擦系數(shù)和磨損率分別為0.108 7和1.49×10-3 g/m。
關(guān)鍵字: 碳納米管; 表面改性; 復(fù)合鍍層; 摩擦行為
ZHOU Ling-ping, LI De-yi, LI Xue-qian
（College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: After multi-walled carbon nanotubes(MWNTs)were modified and dispersed uniformly in electrolyte, the MWNTs nickel-phosphorus based composite coatings of high hardness were prepared by chemical deposition technique. The results show that hydroxylic groups and carboxylic groups exist on the surface of carbon nanotubes after acid treatment. The loading capacity and disperision ability of MWNTs within the composite coating can be improved effectively by surface modification with surfactant. Due to the addition of MWNTs, the microhardness of MWNTs composite coating is improved and the value of microhardness reaches HV 946. The Ni-P-MWNTs composite coatings revealed a lower wear rate and friction coefficient compared with SiC composite coatings, especially, their triboligical properties are more excellent at the combination of MWNTs composite coatings. Their friction coefficient and wear rate are 0.108 7 and 1.49×10-3 g/m, respectively.
Key words: MWNTs; surface modification; composite coating; tribological behavior
