Cold spraying reinforcing material repairing material and repairing method of worn Roots blower cover plate

Abstract

The invention provides a cold spraying reinforcing material repairing material and a repairing method of a a worn Roots blower cover plate. The material comprises, by weight, 55%-65% of Ni60, 24%-32%of Cu powder, 6%-8% of Zn powder, 3%-5% of Al2O3 powder, and the sum of the weight percentages of the components is 100%. The method comprises the following steps: (1) pre-treatment is carried out before the cold spraying of the Roots blower cover plate is worn, performing surface sand blasting treatment on the worn roots blower cover plate by using brown fused alumina; and (2) the cold spraying repair parameters of the worn Roots blower cover plate are as follows: the preheating temperature of the cold spraying base body is 100 DEG C, the temperature of spraying gas is 300-500 DEG C, the pressure is 0.6-0.8 MPa, the spraying distance is 25 mm, the powder feeding amount is 0.4g to 0.6g / s; and (3) the heat treatment parameters are as follows: the heat treatment temperature is 500-600 DEG C,the heating speed is 3 DEG C / min, the heat preservation time is 2 hours, and the mixture is cooled along with a furnace.

Description

technical field [0001] The invention relates to the field of additive repair coating preparation, in particular to an additive repair material and a repair method for a worn Roots blower cover plate. Background technique [0002] As one of the important parts in the work of Roots blower, the cover plate of Roots blower is mainly used to connect the casing and the impeller, support the rotation of the impeller, and play the role of end face sealing. Because the Roots blower cover plate is mainly worn from the end face during work, the worn cover plate cannot achieve a good sealing effect, resulting in the failure of the entire Roots blower equipment to operate normally, bringing immeasurable losses to the enterprise. If the worn Roots blower cover plate is directly replaced (completely replaced), it will increase the production cost of the enterprise. [0003] The surface repair technology only repairs the damaged area, so that the repaired parts can meet the needs of actual...

AI Technical Summary

Problems solved by technology

For the damaged Roots blower cover plate, the commonly used surface repair techniques include surfacing welding, thermal spraying, electric brush plating and other processes, but there are certain deficiencies. Pores, inclusions, etc. are prone to appear in the surfacing layer after surfacing welding. Defects; thermal spraying will cause serious deformation of the Roots blower cover, resulting in a decrease in the sealing of the cover; although brush plating has no thermal impact, the plating solution is seriously polluted, and the thickness of the coating is also strictly limited

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