| 摘要 |
PROBLEM TO BE SOLVED: To obtain a powdery titanium compound useful as a base material component of a friction material for an automotive brake device, or the like. SOLUTION: This powdery multiple titanium compound consists of combined crystal grains each of which is formed by joining together a crystal grain of an alkaline earth metal titanate represented by the formula RTiO3 (wherein R is Mg, Ca, Sr or Ba) and a crystal grain of a hollandite type octotitanate represented by the formula AXMYTi8-YO16 (wherein: A is an alkali metal element or Ba; M is Al, Fe, Cr, Ga, Mg, Co, Ni, Cu or Zn; X is a numerical value of 0.5-3; and Y=X/2 when M is a divalent element and Y=X when M is a trivalent element). The production process of the powdery multiple titanium compound comprises: mixing powdery TiO2, A2O, RO and MO* (wherein MO* is MO or M2O3) together to obtain a powdery mixture; granulating the powdery mixture into granules; subjecting the granules to firing treatment at 1,300-1,500 deg.C; and thereafter, subjecting the fired material to disintegrating treatment to produce the objective powdery titanium compound. As an effect of the combined crystal structure, for example, frictional wear characteristics (such as friction coefficient, wear resistance and mating surface damage property) of a friction material for a brake device can be enhanced by using this titanium compound as a base material component of the friction material. |
