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首页> 外文会议>1999 Global Powertrain Congress Vol.11: New Materials amp; Development Processes Oct 5-7, 1999, Stuttgart, Germany >Process and Materials Development for Laser Cladding Valve Seats on Aluminum Engine Heads
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Process and Materials Development for Laser Cladding Valve Seats on Aluminum Engine Heads

机译：铝制发动机盖上的激光熔覆气门座的工艺和材料开发

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摘要

The use of aluminum alloys for powertrain components is restricted because their ability to resist wear and their hardness at high temperature are not as good as those of other construction materials. If laser processing could produce a hardfacing layer on aluminum alloys this could extend the use of aluminum alloys greatly. We have therefore developed a laser cladding technology by which Cu-base alloy is deposited onto aluminum alloy with little dilution. Laser cladding valve seats have been developed for aluminum engine heads to replace powdered metal valve seat inserts. To develop a engine head with laser cladding valve seats, we have developed element techniques. A high-power laser cladding optics in which energy distribution are shaped to be fitted for a pre-machined pocket has been developed. A unique Cu-base powder has also been developed to provide resistance to wear, hardness at high temperature, claddability, and machinability. We evaluate the laser cladding valve seats on a four-cylinder engine, and demonstrate their advantages over conventional powdered metal inserts, such as the reduced valve temperature, less knocking, and improved engine performance.
机译：铝合金在动力总成组件中的使用受到限制，因为它们的抗磨损能力和高温下的硬度不如其他建筑材料。如果激光加工可以在铝合金上产生表面硬化层，则可以大大扩展铝合金的使用范围。因此，我们开发了一种激光熔覆技术，该技术可将铜基合金以很少的稀释量沉积到铝合金上。激光熔覆阀座已开发用于铝制发动机缸盖，以取代粉末状的金属阀座插件。为了开发带有激光熔覆气门座的发动机盖，我们开发了元件技术。已经开发出了一种高功率激光熔覆光学器件，其中能量分布被成形为适合于预先加工的腔。还开发了一种独特的铜基粉末，以提供耐磨性，高温硬度，可包覆性和可机加工性。我们评估了四缸发动机上的激光熔覆气门座，并展示了其与传统粉末金属插件相比的优势，例如降低了气门温度，减少了爆震并提高了发动机性能。

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