Abstract
The objective of this study is to investigate the tribological behavior of graphene nanoplatelets (xGnPs) as nano-solid lubricants, and to evaluate their applicability to the micro-drilling of multi-directional carbon fiber-reinforced plastic (MD-CFRP). To verify the tribological effect of nano-solid lubricants, three kinds of xGnPs (xGnP C-750, xGnP M-5, and xGnP H-5), multiwall carbon nanotubes (MWCNTs), and hBN are compared by the ball-on-plate test. Of these, three xGnPs are selected as nano-solid lubricants to investigate the micro-drilling performance of MD-CFRP using nano-solid dry lubrication, and the experimental results demonstrate that all xGnPs can enhance lubrication action in terms of surface quality (delamination, uncut fiber, and inner surface) and tool wear. In particular, larger graphene nanoplatelets (xGnP M-5 and xGnP H-5) are superior to the smaller one (xGnP C-750) by guaranteeing enhanced sliding action between the tool grain and the CFRP composite.
Highlights
A carbon fiber-reinforced plastic (CFRP) composite that can be fabricated by combining carbon fiber and polymer matrix has been used for high-tech applications, such as in the automobile and aerospace industries
The characteristics of micro-drilling of multidirectional carbon fiber-reinforced plastic (MD-CFRP) were evaluated while considering the tribological behavior of graphene nanoplatelets as nano-solid lubricants
To confirm the tribological behavior of the nano-solid lubricants against CFRP composite, the ball on plate test was conducted to investigate the coefficient of friction, wear width, and wear depth
Summary
A carbon fiber-reinforced plastic (CFRP) composite that can be fabricated by combining carbon fiber and polymer matrix has been used for high-tech applications, such as in the automobile and aerospace industries. The CFRP composite is generally known as a superior metal substitute due to its advanced properties, such as superior strength-to-weight ratio, stiffness, damage tolerance, and so on [1,2]. To enable efficient machining with CFRP composite, there is a demand for an appropriate lubrication approach. Metal working fluids (MWFs) has typically been used as the types of wet flooding and minimum quantity lubrication (MQL) for reducing high cutting heat, and improving lubrication performance, respectively. To further enhance machining performance, nano-scale particles have been used as nanofluids by adding them to MWFs and liquid medium to help the lubrication action during the machining process, and their effectiveness in nanofluid MQL machining on metallic materials has been verified [6,7,8]
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