We synthesized potassium hexatitanate, (K2Ti6O13, PT6), with a non-fibrous shape, by acid leaching and subsequent thermal treatment of potassium tetratitanate (K2Ti4O9, PT4), with layered crystal structure. By controlling nucleation and growth of PT4 crystals, we obtained splinter-type crystals of PT6 with increased width and reduced thickness. The optimal holding temperature for the layered PT4 was found to be ~920 oC. The length and width of the PT4 crystals were increased when the nucleation and growth time were increased. After a proton exchange reaction using aqueous 0.3 M HCl solution, and subsequent heat treatment at 850 oC, the PT4 crystal transformed into splinter-type PT6 crystals. The frictional characteristics of the friction materials show that as the particle size of PT6 increases, the coefficient of friction (COF) and wear amounts of both the friction materials and counter disc increase.

• 이정주(상신브레이크 기술연구소, 경북대학교 신소재공학부) | Jung Ju Lee
• 이나리(한국세라믹기술원 이천분원) | Na-Ri Lee
• 피재환(한국세라믹기술원 이천분원) | Jae-Hwan Pee
• 김종영(한국세라믹기술원 이천분원) | Jong-Young Kim Corresponding author
• 김정주(경북대학교 신소재공학부) | Jeong-Joo Kim Corresponding author