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Surface modification method for GCr15 plunger matching parts by injecting nitrogen and carbon plasma ions

A technology of carbon ion implantation and plunger coupling, applied in the direction of ion implantation plating, coating, metal material coating process, etc., to achieve the effect of safe operation control, improved yield and high efficiency

Inactive Publication Date: 2010-09-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]The purpose of the present invention is that the heat treatment temperature of the existing surface modification process is high, the dimensional stability of the product is not easy to control, and the matching accuracy of the plunger couple cannot be satisfied demanding questions

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0019] Specific embodiment one: present embodiment is that the surface modification method of nitrogen and carbon plasma-based ion implantation GCr15 plunger couple is realized by following steps: one, GCr15 plunger couple is ultrasonically treated twice with acetone (purpose is to remove surface oil), each treatment is 5-8min; 2. The voltage is 500-700V, the working pressure is 0.08-0.2Pa, and the injection current is 0.25μA / cm 2 , the working gas is argon, the radio frequency power is 200~800W, and the argon plasma density is 1×10 9 ~1×10 10 cm -3 Under certain conditions, the GCr15 plunger parts cleaned by acetone were pre-sputtered for 20 to 30 minutes; 3. Nitrogen ion implantation was performed on the GCr15 plunger parts cleaned by pre-sputtering, and the nitrogen ion implantation treatment The process parameters are as follows: the back and bottom air pressure is 1×10 -4 Pa, the gas source is nitrogen with a purity of 99.99% (mass), the nitrogen ion implantation volta...

specific Embodiment approach 2

[0023]Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the ultrasonic treatment with acetone takes 5.5-7.5 minutes each time. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0024] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 1, the ultrasonic treatment time with acetone is 6 minutes each time. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for surface modification through injecting nitrogen and carbon plasma based ions into a GCr15 plunger matching piece and relates to a method for surface modification of the GCr15 plunger matching piece. The method solves the problems that the prior surface modification process has high heat treatment temperature; and the dimension stability of a product is uneasy to control and can not meet the requirement of high matching precision of the plunger matching piece. The method comprises the following steps: 1. ultrasonic treatment; 2. pre-sputtering and cleaning;3. the injection treatment of nitrogen ions; and 4 the injection treatment of carbon ions. The method has the advantages of batch production, high surface hardness, low production cost, prolonged service life of the product and the like; in the injection process, the temperature of the plunger matching piece is less than 150 DEG C to ensure that the dimension precision of the product is unchanged, thereby improving the yield of the product; which reaches as high as 99.9 percent.

Description

technical field [0001] The invention relates to a surface modification method of a GCr15 plunger pair. Background technique [0002] The plunger coupling is a key part of the engine, and its matching accuracy is less than 2 μm. It wears out during the reciprocating motion, which increases the gap between the plunger rod and the sleeve, and easily leads to a decrease in the engine's oil supply capacity and efficiency. With the development of science and technology, the power of the engine continues to increase, and the working conditions of the plunger couple are getting worse and worse. The existing plunger couples are mostly made of GCr15 steel, and their service life has not reached the design requirements. A bottleneck problem that restricts engine upgrades. [0003] At present, there are two ways to improve the service life of the plunger coupling: one is to replace the material, and the other is to modify the surface of the plunger coupling (such as spraying, laser su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/54C23C14/48C23C14/34
Inventor 马欣新唐光泽
Owner HARBIN INST OF TECH
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