Synthesis of Potassium Titanate Fibers for Friction Materials

Abstract

Potassium hexa and octatitanate fibers have been proposed as reinforcement for friction materials. The aim of this work was to establish a calcination route to produce these fibers, using commercial anatase and potassium carbonate powders. These powders were dry mixed with TiO2/K2O molar ratio, n, of 3.0, 3.5, and 4.0, and then calcined at 950, 1050, and 1150°C for 3 h. Calcined powders were milled, washed in warm water with different pHs, and heat treated to crystallize the fibers. The best conditions to growth long fibers were n=3.0 and 1050°C, in the twofase field (liquid + K2Ti4O9). Controlled ion-exchange with water removed K+ ions from K2Ti4O9 fibers resulting in potassium hexa or octatitanate fibers after the second heat-treatment. Fibers with sub-micrometer thickness (~0.6 μm) and average length of ~20 μm could be prepared.

Surface engineering of titanium with potassium hydroxide and its effects on the growth behavior of mesenchymal stem cells

“…We hypothesized that surface engineering of Ti substrates with potassium hydroxide could form potassium titanate layers on their surfaces. Potassium titanates (K 2 OÁnTiO 2 , n = 2, 4, 6 or 8) have been widely used as fiber-reinforced ceramics and friction materials [11][12][13] due to their good mechanical, thermal and corrosion-resistance properties. Thus, the anticorrosion property of Ti substrates was expected to be improved by protection from potassium titanate layers.…”

Effect of fiber addition on slow crack growth of a dental porcelain

“…These fibers were prepared by the calcination method, heat-treating a mixture of anatase (TiO 2 ) and potassium carbonate (K 2 CO 3 ) powders at 1050 1C, followed by washing in warm water, and stabilization at 800 1C. Further information regarding the synthesis method of potassium hexatitanate fibers can be found elsewhere (Yoshimura et al, 2008b). Fig.…”