| 摘要 |
The invention relates to a light metal cylinder block that comprises at lea st one wear resisting and tribologically optimized cylinder face and that consists of a light metal matrix alloy with a finely dispersed surface layer containi ng primary silicon deposits. Said surface layer consists of globular grains wit h grain diameters between 1 and 10 .mu.m and contains 10 to 14 % AlSi eutectics, 5 t o 20 % primary silicon, remainder pure Al phase. According to the inventive metho d for producing the light metal cylinder block, a laser beam is guided across the light metal matrix surface in a strip width vertically to the direction of feed of at least 2 mm. Hard material powder is heated up to a melting temperature at the point of incidence of the laser beam on the light metal matrix surface a nd is diffused. The inventive device for coating the face of hollow cylinders consists of a powder supply means, a laser beam device and a focussing system with a deviation mirror. The powder supply means and the laser beam device are guided in parallel to each other in the radial and in the axial direction of the hollow cylinder. The focussing system is provided with a linear beam gate. T he powder supply means is provided with a dosing unit which is used to adjust t he volume flow of the powder depending on advance speed of the laser beam.</SDO AB> |
