Plasma piston ring surface strengthening and toughening treatment method
A treatment method, a plasma technology, is applied in the field of strengthening and toughening the surface of the plasma piston ring, which can solve the problems of poor wear resistance and lubrication performance, short life, etc., and achieve the effect of low cost
Inactive Publication Date: 2006-12-13
DALIAN MARITIME UNIVERSITY
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Problems solved by technology
[0003] In order to solve the problems of poor wear resistance and lubricating performance and short service life of large marine piston rings, the purpose of this invention is to provide a method for strengthening and toughening the surface of plasma piston rings
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0006] Place the piston ring to be treated in a hanging vacuum plasma diffusion device, input a voltage of 800V, and a current density of 1.5-2.5mA / cm 2 , filled with gas, the gas composition and ratio are: ammonia: acetone = 10: 1, the air pressure is 1.10 ~ 1.20kPa, the temperature is raised to 550°C, kept for 2.5 hours, then cooled to 530°C, kept for 2 hours, and then furnace cooled to 150°C °C, that is, the strengthening and toughening treatment of the piston ring surface is completed. The piston ring after the above treatment has the following properties: Organization: ε(Fe 23 N)+γ′(Fe 4 N); surface hardness: HV980-1100; (3) penetration depth: 0.20 ~ 0.23mm; (4) wear rate: 0.072 / kh; (5) service life: 16500h.
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Abstract
The invention relates to an intensified handling method for plasma piston ring surface. The steps of this invention includes: placing the armed piston ring into vacuum plasma -diffuser, importing voltage of 750-850V and electric current with density of 1.5-2.5mA / cm2, filling gases, in which the gas composition is ammonia and acetone and the proportion of which is 10:1 with 1.10-1.20kPa air pressure, heating-up to 550 DEG C-600 DEGC and preserving heat for 1-3 hours, then cooling to 530 DEG C-550 DEGC and preserving heat for 1-3 hours, afterwards cooling the furnace to 150 DEG C, accordingly finishing the intensified handling method for piston ring surface. The significance effect of this invention is: the hardness and deepness of the surface penetrative layer all reach or exceed the chrome-coated and hot spraying level, and the penetrative layer can not pull-off, and is of free pollution and cheap cost.
Description
technical field [0001] The invention belongs to the technical field of processing and manufacturing large-scale marine piston rings, and relates to a method for strengthening and toughening the surface of a plasma piston ring. Background technique [0002] At present, the large-scale marine piston rings have poor wear resistance and lubrication performance, and have the problem of short service life. Invention content: [0003] In order to solve the problems of poor wear resistance and lubricating performance and short service life of large marine piston rings, the object of the present invention is to provide a method for strengthening and toughening the surface of a plasma piston ring. [0004] The technical solution adopted in the present invention is a method for strengthening and toughening the surface of a plasma piston ring. The density is 1.5~2.5mA / cm 2 , filled with gas, the gas composition and ratio are: ammonia: acetone = 10:1, the air pressure is 1.10~1.20kPa...
Claims
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IPC IPC(8): C23C14/48
Inventor 魏海军关德林王宏志
Owner DALIAN MARITIME UNIVERSITY