A precision pulse arc spot welding ceramic particle planting method
A technology of ceramic particles and pulsed arc, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of insufficient bonding force, low efficiency, and large influence on the structure and performance of the base material, and achieve low equipment cost investment and high efficiency , to achieve the effect of automation
Active Publication Date: 2022-02-01
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
However, there are still many problems in the preparation process of the wear-resistant coating on the blade tip of the high-temperature section (mainly electrodeposition, brazing, spark discharge planting, etc.) that need to be further studied, such as insufficient bonding force, and the preparation process has no effect on the microstructure and properties of the base metal. Large impact, low efficiency, etc., the development of a new coating preparation process has also become a necessary way for the mature application of high-temperature blade tip wear-resistant coatings
Method used
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Embodiment 1
[0028] The nickel-based single crystal superalloy PWA1484 is selected as the workpiece material, and the surface of the workpiece is polished and smoothed, cleaned with absolute ethanol and dried. The ceramic particles are made of Al 2 o 3 Particles, particle size 180μm~380μm, using electroless plating process on Al 2 o 3 A Ni-P alloy conductive layer was prepared on the particle surface with a layer thickness of 50 μm.
[0029] Connect the workpiece to the negative electrode of the precision pulse spot welding machine and adjust the level, connect the tungsten electrode to the positive electrode, and Al with conductive layer 2 o 3 The ceramic particles are spread evenly on the surface of the workpiece.
[0030] The welding wire is made of Ni-based superalloy, and the diameter of the welding wire is 1.6mm. Adjust spot welding parameters: pulse current 80A, pulse time 40ms, pulse frequency 1Hz, distance between electrode and workpiece 2mm. Place the wire on the Al 2 o ...
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Abstract
A precision pulse arc spot welding method for planting ceramic particles, comprising the following steps: (1) polishing and cleaning the surface of a workpiece to be planted; (2) preparing a metal conductive layer on the surface of the ceramic particles to be planted; (3) connecting the workpiece to The negative electrode of the spot welding equipment is connected, the tungsten electrode is connected to the positive electrode, and the surface metallized ceramic particles are evenly placed on the surface of the workpiece to be planted, and the precision pulse arc spot welding equipment is turned on to set the particle planting parameters; (4) Between the electrode and the particles The welding wire is introduced, and the welding wire, particles, and workpiece are in direct contact. When there is a certain distance between the electrode and the workpiece, the power is turned on to form a pulse arc, and the planting process of pulse spot welding particles is completed; (5) Large-scale ceramic particle planting is completed by point-by-point planting. Thus forming a wear-resistant coating. The invention can realize large-area ceramic particle planting.
Description
technical field [0001] The invention relates to a method for planting ceramic particles by precision pulse arc spot welding, and belongs to the technical field of wear-resistant coatings for aeroengine turbine blades. Background technique [0002] The sealing of an aero-engine is an important factor affecting the efficiency of the engine. At present, the fan blades and compressor turbine blades in the low-temperature section are sealed with a wear-resistant coating on the tip and an abradable sealing coating on the inner surface of the casing to improve the airtightness. As the engine performance is getting higher and higher, the wear-resistant coating of the blade tip in the high temperature section has gradually attracted attention. Blades in the high temperature section (greater than 850°C) usually use single crystal superalloys to obtain better high temperature performance. Compared with the blades in the low-temperature section, the blade tip of the high-temperature s...
Claims
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IPC IPC(8): B23K9/00B23K9/235B23K9/23C04B41/88C04B37/02
CPCB23K9/00B23K9/235B23K9/23C04B41/88C04B41/5144C04B41/009C04B37/023B23K9/0026C04B2237/123C04B2237/124C04B2237/121C04B35/10C04B41/4584
Inventor 王德周彰宇王文琴程东海熊震宇江淑园刘频胡德安
Owner NANCHANG HANGKONG UNIVERSITY