Conventional materials that have to function in rigorous conditions can exhibit extraordinary properties in tough conditions just from reinforcement with carbon nanotubes (CNTs). However, the manufacturing methods available for CNTs are complex and cumbersome, in terms of the process parameters. In our research work, we have intensively concentrated on the synthesis of functionally-graded material reinforced with long carbon fiber nanotubes for cylinder linings in a four-wheeler. The matrix constituent under consideration is AA7075 and the reinforcing constituents are titanium nitride (TiN) and multi-walled carbon nanotubes. These constituents are blended as per defined mixture rules, having matrix mass percentages of 100%, 95%, 90%, 85% and 80%, TiN and CNT mass percentages of 0%, 2.5%, 5%, 7.5%, and 10% are taken in equal proportions. The specimens are synthesized using centrifugal casting and layer-by-layer deposition of the matrix and the reinforcing constituents from the bottom to the top layer, as per the ASTM G33 standard. The uniform dispersion of the CNTs is assured with the aid of an ultrasonic cavitation methodology. The specimens are tested for their mechanical properties, such as tensile and impact strength, and macro- and microhardness. Scanning electron microscopy (SEM) together with energy-dispersive x-ray analysis (EDS) are utilized to verify a continuous phase and uniform dispersion of the carbon nanotubes and the titanium nitride within the matrix constituent. The results show that there is strong interfacial bonding with respect to layers and the interstitial region. Tribological characterization shows that the maximum wear rate, frictional force and coefficient of friction attained values of 100 microns, 15.6 N and 0.15 respectively, at a constant speed of 675 rpm and a wear time of 30 min, over a sliding distance of 9500 m. ANOVA and multiple linear regression are conducted to optimize and standardize the process parameters of the manufacturing process.

仅在碳纳米管（CNT）的增强作用下，必须在严格条件下起作用的常规材料才能在恶劣条件下表现出非凡的性能。然而，就工艺参数而言，可用于CNT的制造方法复杂且麻烦。在我们的研究工作中，我们集中精力于合成功能级的材料，该材料由四轮车的气缸衬里用长碳纤维纳米管增强。所考虑的基体成分为AA7075，增强成分为氮化钛（TiN）和多壁碳纳米管。这些成分按照定义的混合规则进行混合，基质质量​​百分比为100％，95％，90％，85％和80％，TiN和CNT质量百分比为0％，2.5％，5％，7.5％和10 ％以等比例获取。根据ASTM G33标准，使用离心浇铸法以及从底层到顶层的基体和增强成分的逐层沉积和逐层沉积的方法合成样品。借助于超声空化方法，可以确保CNT的均匀分散。测试样品的机械性能，例如拉伸强度和冲击强度，以及宏观和微观硬度。扫描电子显微镜（SEM）与能量色散X射线分析（EDS）一起用于验证碳纳米管和氮化钛在基体成分内的连续相和均匀分散性。结果表明，在层和间隙区域之间存在牢固的界面结合。摩擦学表征表明，最大磨损率 在9500 m的滑动距离上，在675 rpm的恒定速度和30分钟的磨损时间下，摩擦力和摩擦系数分别达到100微米，15.6 N和0.15。进行方差分析和多元线性回归以优化和标准化制造过程的过程参数。