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随着大马力柴油机的发展和强化,对柴油机气阀也相应地提出了愈来愈高的要求,即不但要具有较高的室温强度和硬度,而且更重要的是要具有足够的高温性能,以保证气阀在高温工作时的良好的耐磨损性能和抗氧化、抗燃气腐蚀能力。这对由奥氏体耐热钢制成的整体气阀已不能满足使用要求,而需要采用阀面经过堆焊特种材料的堆焊气阀。因此,堆焊材料的成分和性能,将直接决定气阀阀面的质量、性能和使用寿命。 常见的堆焊合金一般有三类:钴基合
With the development and enhancement of high-horsepower diesel engines, the valve of diesel engine is correspondingly put forward higher and higher requirements, that is, it not only has higher room temperature strength and hardness, but more importantly, has sufficient high-temperature performance, To ensure that the valve when working at high temperatures, good wear resistance and anti-oxidation, anti-gas corrosion. This is made of austenitic heat-resistant steel integral valve has been unable to meet the requirements, and the need to adopt the surfacing welding material surfacing valve. Therefore, the composition and properties of the surfacing material will directly determine the valve surface quality, performance and service life. Common surfacing alloys generally have three categories: cobalt-based