Copper alloy sealing material for kerosene pump and preparation method thereof

Abstract

The invention particularly relates to a copper alloy sealing material for a hydraulic pump which uses kerosene as a medium and a preparation method thereof, belonging to the field of metallurgy materials. The copper alloy sealing material comprises the following chemical components by weight percentage: 9.5 to 10.5% of Sn, 3.5 to 4.5% of Pb, 4.5 to 5.5% of Zn, 1.0 to 2.0% of Ni, 1.0 to 2.0% of Al2O3, and the balance being Cu. The preparation method for producing the copper alloy sealing material used for a kerosene pump comprises the following steps of preparation of mixed powder of the above-mentioned copper alloy raw materials, addition of a lubricant, mixing, pressing and sintering; the addition amount of the mixed powder of the copper alloy raw materials is 1 to 2%, complete mixing iscarried out after addition of the lubricant, and an obtained mixture is subjected to molding at first, then to sintering under the protection of hydrogen and finally to repressing. The sealing material has the advantages of stable friction performance, resistance to dry grinding, capacity of self-lubricating, a long service life, guaranteed security and reliability, etc.

Description

technical field [0001] The invention belongs to the field of metallurgical materials, in particular to a copper alloy sealing material for a hydraulic pump with kerosene as a medium and a preparation method thereof. Background technique [0002] The shaft tail sealing device of the plunger hydraulic pump widely adopts mechanical seals to prevent the leakage of hydraulic medium between the pump shaft tail and the casing. It mainly relies on the dynamic and static sealing rings to stick to each other and slide relative to each other under the action of spring force and medium pressure to ensure dynamic sealing, and to undergo static sealing test assessment under the same sealing medium pressure. [0003] The dynamic and static sealing materials of the shaft tail seal are mostly copper-impregnated graphite / steel or bronze / steel pairing materials at home and abroad. However, bronze materials have poor self-lubricating properties and are not resistant to dry wear. The sealing pa...

AI Technical Summary

Problems solved by technology

The sharp drop in oil viscosity reduces the cohesion of the oil, and the oil film is unstable and easy to break under the same contact stress, so that the metal is in direct contact and the wear of the friction pair is accelerated

[0008] ②The lubricity of kerosene is poor

The natural lubricating substances in the highly refined pump kerosene are reduced, and the lubricity is poor (expressed in extreme pressure, wear resistance and friction characteristics), which makes the friction pair work almost in a dry grinding state

This significantly increases the friction coefficient of the material in kerosene (about 10 times that in hydraulic oil), resulting in severe wear of the kerosene pump shaft tail seal material

[0009] ③The permeability of kerosene is strong, and the leakage increases

There are rough and uneven discontinuous labyrinth recesses on the entire sealing surface, causing leakage of hydraulic oil

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