Noncrystalline composite alkali metal titanate composition and friction material

摘要

A noncrystalline composite alkali metal titanate composition which is chemically stable, outstanding in resistance to hygroscopicity and suited as base materials for friction materials. The said composition comprises at least 60 wt. % of an alkali metal titanate represented by the general formula M₂O.nTiO₂ wherein M is one or at least two alkali metal elements and n is a number of 1 to 4, and at least 10 wt. % of SiO₂, M₂O/SiO₂ being equal to or less than 2.5. When desired, it is possible to incorporate into the composition an oxide of at least one element selected from the group consisting of B, Mg, Al, P, Ca and Zn, and/or an oxide of at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb and Ba.