Abstract:

Potassium magnesium titanate with excellent mechanical properties is widely used as friction materials of various advanced brake pads. The influence of composition and morphology on braking effect is very large, but the traditional synthesis method can not effectively control it. In this paper, we successfully obtained the potassium magnesium titanate with excellent crystallinity and morphology by controlling the calcination process. Platy potassium magnesium titanate(KMTO) was synthesized by molten salt method with KCl as the molten salt and Mg(OH)₂, K₂CO₃ and TiO₂ as raw materials. The effect of calcination process(heating rate, calcination temperature and holding time) on phase composition and morphology of obtained KMTO were analyzed by X-ray diffraction and scanning electron microscopy. The mechanism of this reaction was explored preliminarily. Calcination process was found to significantly affect the composition and morphology of KMTO synthesized by molten salt method. When raw materials are calcined at 1000 ℃ for 2 h by heating rate at 200 ℃/h(>800℃) and 100 ℃/h(>800 ℃), platy K_0.8Mg_0.4Ti_1.6O₄ with high crystallinity and uniform morphology is obtained after washing and drying.

Key words: molten salt method, calcination process, potassium magnesium titanate, plate-like