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随着航空燃气轮机工作温度的升高,从六十年代开始,涡轮叶片已逐渐由变形合金转变为铸造合金。晶粒度是精密铸件的关键问题。虽然对涡轮叶片采用粗晶粒还是细晶粒尚有争论,但在一般精密铸造工艺中所得铸件,晶粒显然过大。目前比较简便和通用的控制晶粒度的方法是在铸模表面施加成核剂;本文从“洋为中用”出发,先简略地叙述成核原理,以后回顾了收集到目前为止的有关浸涂层成核法的技术和专利文献,特别对专利的实例作了详细介绍,以便在实际生产中参考应用。
As the operating temperature of aviation gas turbines has increased, turbine blades have gradually transformed from deformed alloys to foundry alloys since the 1960s. Grain size is the key issue of precision castings. Although the use of coarse or fine grain turbine blades is still controversial, but in the general casting process obtained castings, the crystal is obviously too large. At present, the simple and universal method for controlling the grain size is to apply the nucleating agent on the surface of the mold. In this paper, the principle of nucleation is described briefly from “ocean to intermediate use”, and the principles of nucleation, Layer nucleation technology and patent literature, in particular, the patent examples were described in detail in order to refer to the actual production applications.