Pengaruh komposisi penguat carbon nanotube terhadap peningkatan ketahanan aus dan self-lubrication cylinder liner berbasis pelapisan CNT-Al2O3+13% TiO2 nanokomposit dengan metode cold spraying = Effect of carbon nanotube composition strengthening and matrix types to improving wear resistance and self lubrication coating cylinder liner and piston ring with CNT-Al2O3 + 13% TiO2 coating by cold spraying