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美国普拉特·惠特尼公司设计研制了一种复合式(两半分扩散连接)柱状晶或单晶涡轮叶片,目前正在该公司的米德尔城工厂使用全自动铸造设备生产这种先进的叶片。复合式涡轮叶片具有普通精铸叶片设计所达不到的设计灵活性,它有较好的冶金结构和均匀性,少量的冷却空气可以达到有效的内部冷却;这种叶片重量很轻,但能承受高温转速下的大应力,从而获得发动机的高效率。试验表明,复合式柱状晶叶片至少是现有叶片寿命的两倍,而使用单晶材料的涡轮叶片,寿命改进的潜力是现有叶片的四倍,而二级涡轮叶片还可达五倍。 普拉特·惠特尼公司1976年铸出了第一批单晶研制件,1977年用自动设备铸造试验叶片,第一批复合式柱状晶涡轮叶片已用于空军F-15和F-16飞机的动力装置——F100发动机。目前已成功地完成了1500小时的飞行试验。其他试验项目亦于去年按计划进行。 复合式涡轮叶片的生产采用全自动程序控制,用
Pratt & Whitney, USA, designs and manufactures a composite (two half-diffusion-bonded) columnar or monocrystalline turbine blade that is currently being manufactured at its Middelstadt plant using fully automatic casting equipment to produce this advanced blade . Composite turbine blades have the design flexibility not found in conventional precision cast blade designs with good metallurgical structure and uniformity with a small amount of cooling air for efficient internal cooling; this blade is lightweight but capable of Withstand the high temperature under high speed, so as to obtain the high efficiency of the engine. Trials have shown that composite columnar vanes have at least double the life of existing vanes, while turbine blades made of single crystal material have the potential to improve life expectancy by four times that of existing vanes and up to five times more than secondary vanes. Pratt & Whitney Company produced the first batch of single crystal research and development pieces in 1976. In 1977, it used automatic equipment to cast test blades. The first composite columnar crystal turbine blades have been used in the Air Force F-15 and F-16 aircraft Powerplant - F100 engine. Has successfully completed 1,500 hours of flight test. Other pilot projects were also carried out as planned in the previous year. The production of composite turbine blades using automatic program control, use