| 摘要 |
<p>A friction lining suitable for brakes, clutches etc. comprises mineral fibres which contain alumina, Al2O3, silica, SiO2, and lime, CaO. The mineral fibres have a percentage by weight of alumina, Al2O3, of between 18% and 25%, a percentage by weight of silica, SiO2, of between 38% and 45% and a percentage by weight of lime, CaO, of between 23% and 33% and preferably of the order of 27%. Moreover, the mineral fibres contain iron oxide, Fe2O3, in a proportion by weight of between 0.5% and 1%, alkali metal oxides, Na2O and K2O, in a proportion by weight of between 4% and 10% and magnesia, MgO, in a proportion by weight of between 0.5% and 3%.</p> |
