| 摘要 |
<p>The invention relates to a process for preparing a composite powder of copper-coated graphite intended to be employed for preparing hybrid aluminium-matrix composites for anti-friction parts to be used in the transport industry. According to the invention, the process comprises the following stages: screening the graphite powder with a grain size ranging between 20...63μm; cleaning the surface of graphite particles by reduction with hydrogen; sensitizing the surface of graphite particles in a solution of SnClx 2HO, at a temperature of 70...90°C; activating the surface of graphite particles in an AgNOsolution; cementing at a temperature of 15...25°C by reducing the copper from a CuSO-containing solution, using formic aldehyde as a reducing agent; filtering the coated powder, followed by washing, drying and thermally treating with hydrogen at 300...350°C for surface oxides reduction.</p> |
