Rare Earth Tungsten High Specific Weight Alloy for Balance Shaft of Aircraft Engine

The balancing shaft of aircraft engine is a simple and practical engine part. It can effectively reduce the vibration of aircraft in flight, because when the engine is in working state, the piston moves very fast and the speed is very uneven. The balancing shaft can effectively improve the comfort of passengers. Tungsten-based high specific gravity alloys are commonly used in balancing axles of aircraft engines.

With the rapid development of science and technology, the comprehensive properties of tungsten-based high specific gravity alloys have been put forward higher and newer requirements. The properties of traditional tungsten-based high specific gravity alloys have been far from meeting the application requirements. In recent years, due to its unique atomic structure and activity, rare earth can also be doped into tungsten-based high specific gravity alloys, which can improve wear resistance and corrosion resistance.

The balancing shaft of rare earth tungsten high specific gravity alloy aircraft engine is realized by the following technical scheme:

1.The prepared tungsten-based high specific gravity alloy base powder and rare earth oxide powder are pre-mixed evenly to obtain the mixed raw materials. Then the mixed raw materials are put into a high-energy ball mill according to the ball-to-material ratio of 5:1 for a ball milling. The ball milling time is 2 hours, the ball milling medium is anhydrous ethanol, the material of ball mill tank is 304 stainless steel, and the rotational speed is 300 r/min, before the ball mill starts, the ball mill tank is pre-vacuum, and then argon is introduced as a protective atmosphere.

2.The obtained composite powders were annealed in a tubular high temperature sintering furnace at 800 ℃ for 1 h, and the annealing atmosphere was hydrogen.

3.Put the composite powder into the high-energy ball mill according to the ball-to-material ratio of 5:1 for secondary ball milling. The ball milling time is 2 hours. The ball milling medium is anhydrous ethanol. The material of the ball mill tank is 304 stainless steel. The rotating speed is 300 r/min. The ball mill tank is pre-vacuum before the ball milling starts, and then the argon gas is introduced as a protective atmosphere. The composite powders after secondary ball milling were vacuum dried in a vacuum drying chamber at 70 ℃ for 1 h.

4.The obtained composite powders are loaded into graphite mould and sintered in a spark plasma sintering furnace. The sintering temperature is 1250 ℃, the sintering temperature is 5 min, the sintering pressure is 50 MPa, the sintering atmosphere is vacuum, and the vacuum is less than 10 Pa. After sintering, the graphite mould is cooled with the furnace.

5.Graphite mould is cooled continuously at room temperature. After demoulding, the composite rare earth oxide reinforced tungsten-based high specific gravity alloy aircraft engine balancing shaft is obtained.

The addition of composite rare earth oxides can make the alloy possess both excellent microstructures, finer W grain size and nearly full dense body with a density of more than 98%. The comprehensive properties of the composite materials can be improved, which is of great significance for the study of engine balancing axles with high requirements.

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