Material for brake disc comprising porous body impregnated with ceramic particles

摘要

A method for forming a material for a brake disc comprises introducing into the pore one or more precursor materials for forming or depositing a ceramic material wherein the precursor material is a liquid containing a suspension of ceramic particles and/or acid phosphate. A material for a brake disc comprises a porous body contains within its pores (i) a chemically bonded phosphate ceramic; (ii) a ceramic material which has been deposited; (iii) a ceramic material formable by depositing an initial ceramic material from the liquid suspension and then reacting these particles with monoaluminium phosphate; or (iv) a ceramic material formable by vitrifying monoaluminium phosphate within the pores. In a further aspect a material for forming a brake disc comprises a porous body containing within its pores a ceramic material, wherein the ceramic material is present substantially throughout the porous body. The porous body may be a carbon-carbon composite brake disc. The ceramic particles may comprise alumina, zirconia, magnesia, yttria, silican carbide, silica, boron carbide, boron nitride, titanium boride, iron oxides and chromium oxides. The particles are preferably 20-200 nm in size. The material may also be used in clutch plates.