Composite CuNiIn powder, preparation method and application thereof
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A composite and powder technology, applied in metal processing equipment, coating, molten spraying, etc., can solve the problems of poor anti-fretting fatigue ability, reduce the possibility of micro-cracks, long service life, strong self-lubrication effect of effect
Active Publication Date: 2018-08-21
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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[0004] In order to solve the technical problem of poor fretting fatigue resistance of aeroengine blade tenon in the prior art under high temperature and multi-factor coupling environment, the present invention provides a composite CuNiIn powder and its preparation method and application, which changes the self-lubricating The distribution state of the phase improves the strength and toughness of the coating, effectively avoids the occurrence of micro-cracks in the coating, and improves the self-lubricating life of the coating. It has good application value for aero-engines, gas turbines and other industries.
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preparation example Construction
[0023] Specifically, the preparation method of the composite CuNiIn powder provided by the present invention may comprise the following steps:
[0024] Step A, adopt drum type ball mill to In powder, nickel clad molybdenum disulfide powder, Al 2 o 3 The dispersion-strengthened Cu powder is mixed by ball milling, the ball-to-material ratio is 1.5-1.8:1, and the ball-milling time is 4-10 hours, so as to obtain the mixed raw material. In the mixed raw material, In powder accounts for 4-6 wt%, nickel-coated molybdenum disulfide powder accounts for 35-45 wt%, and the balance is Al 2 o 3 Dispersion strengthened copper powder.
[0025] Step B, adding the mixed raw materials into a spray drying granulator, and adding binder, dispersant, defoamer and water, so that the mass ratio of the binder to the mixed raw materials is 8 to 10:100 , the mass ratio of the mixed raw material to water is 0.9~1.2:1, the consumption of the dispersant and the defoamer are the conventional consumption...
Embodiment 1
[0042] A kind of composite CuNiIn coating, its preparation method can comprise the following steps:
[0043] Step a, Al 2 o 3 Preparation of dispersion strengthened Cu powder: Prepare CuAl alloy powder with Al content of 1-2wt% by water atomization method, then dry and sieve, take -500 mesh powder and place it in a push boat type tubular reduction furnace For internal oxidation, the thickness of the material layer is 2-3cm, the high temperature zone can accommodate 4 boats at the same time, the speed of pushing the boat is 60min / boat, and the oxygen source is N 2 +O 2 , the oxygen partial pressure is controlled at 0.1-0.2Pa, when the temperature in the pushboat-type tubular reduction furnace is room temperature to 300°C, the temperature rise rate is controlled at 3-5°C / min, when the pushboat-type tubular reduction furnace When the temperature is 300-400°C, the temperature rise rate is controlled at 1-2°C / min. When the temperature in the pushboat-type tubular reduction furna...
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Abstract
The invention discloses composite CuNiIn powder, a preparation method and an application thereof. The composite CuNiIn powder comprises a dispersion strengthening phase and a self-lubricating phase. The preparation method comprises the following steps that ball milling and mixing on In powder, nickel-coated molybdenum disulfide powder and A12O3 dispersion strengthening Cu powder are carried out soas to prepare mixed raw materials; a spray drying granulator is adopted to carry out centrifugal atomization granulation on the mixed raw materials to prepare dried granules; and vacuum sintering iscarried out on the dried particles, and then the dried particles are crushed and screened to obtain the composite CuNiIn powder. The composite CuNiIn powder can be prepared into a composite CuNiIn coating containing the dispersion strengthening phase and the self-lubricating phase by adopting a thermal spraying method. The distribution state of the self-lubricating phase is changed, the strength and the toughness of the coating are improved, the generation of micro-cracks of the coating is effectively avoided, the self-lubricating service life of the coating is prolonged, and the composite CuNiIn powder has a good application value in the industries of aviation engines, gas turbines and the like.
Description
technical field [0001] The invention relates to the field of special coating materials for aero-engines or gas turbines, in particular to a composite CuNiIn powder and its preparation method and application. Background technique [0002] The working conditions of the tenon / tenon groove of the titanium alloy blade of the aero-engine compressor are harsh, and it needs to bear the extrusion stress when it is stationary, and it needs to bear the centrifugal stress when it is working. As a result, the blade shroud gap is likely to increase, and the root of the blade may break when the stress is concentrated, which constitutes a hidden danger of fretting fatigue failure. [0003] At present, the main protection method for the tenons of active aero-engine blades is to prepare a CuNiIn coating with a thickness of about 100 μm by plasma spraying (APS), and then apply MoS on the surface of the CuNiIn coating. 2 Dry film lubricants form composite coatings. Due to MoS 2 The dry film ...
Claims
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