Steel and titanium alloy low-temperature pulse ion nitrocarburizing and cathode arc ion plating M/MN alternate plating thick-film technology

A cathodic arc and thick film process technology, which is applied in ion implantation plating, metal material coating process, sputtering plating, etc., can solve the problems of environmental pollution, low hardness and wear resistance of titanium alloy, and achieve environmental protection Pollution, reduction of workpiece deformation, and elimination of stress effects

Inactive Publication Date: 2015-08-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The effects and benefits of the present invention are: to solve the environmental pollution caused by electroplating hard chromium; the hardness of titanium alloy is not high, and the wear resistance is insufficient; the hardness of the wear-resistant layer on the surface of the workpiece can be prepared with a moderate transitional nitrocarburizing layer + M/MN alternate composite thickness The film layer is not easy to fall off in the service hard coating laye

Method used

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  • Steel and titanium alloy low-temperature pulse ion nitrocarburizing and cathode arc ion plating M/MN alternate plating thick-film technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The low-temperature pulse ion nitrocarburizing and cathodic arc ion plating Cr / CrN alternate thick film plating process of piston ring replaces the current electroplating hard chrome process, and adopts low temperature pulse ion nitrocarburizing and cathodic arc ion plating technology as shown in the attached drawing

[0040] Workpiece name: Piston ring

[0041] Workpiece material: 304 stainless steel

[0042] Pre-plating treatment: cold rolling

[0043] Performance requirements: nitrocarburizing layer + Cr / CrN alternate composite thick film layer, hardness 1400 ~ 1600Hv

[0044] Step 1: After the workpiece 3 is polished and ultrasonically cleaned and dried, it is loaded into the vacuum chamber 1 .

[0045] Step 2: Vacuum

[0046] The vacuum chamber 1 is vacuumed 4, and the vacuum degree reaches 2X10 -4 Pa.

[0047] Step 3: Workpiece 3 heating

[0048] The workpiece 3 is subjected to stress relief annealing after being cold-rolled or cold-drawn and the shape of the...

Embodiment 2

[0069] Cam pumping low-temperature pulse ion nitrocarburizing and cathodic arc ion plating Cr / CrN alternate thick film plating process replaces the current electroplating hard chromium process, adopts low-temperature pulse ion nitrocarburizing and cathodic arc ion plating technology as shown in the attached figure,

[0070] Workpiece name: cam pump

[0071] Workpiece material: 20CrMnTi

[0072] Heat treatment before plating: normalizing

[0073] Performance requirements: nitrocarburizing layer + Cr / CrN alternate composite thick film layer, hardness 1600 ~ 1800Hv

[0074] Step 1: After the workpiece 3 is polished and ultrasonically cleaned and dried, it is loaded into the vacuum chamber 1 .

[0075] Step 2: Vacuum

[0076] The vacuum chamber 1 is vacuumed 4, and the vacuum degree reaches 2X10 -4 Pa.

[0077] Step 3: Workpiece 3 heating

[0078] Start heating device 8, workpiece 3 temperature 450 ℃.

[0079] Step 4: Preparation of modified layer by low temperature pulse i...

Embodiment 3

[0099] Low-temperature pulse ion nitrocarburizing and cathodic arc ion plating Ti / TiN alternate thick film plating process for aerospace devices replaces the current electroplating hard chrome process.

[0100] Workpiece material: TC-4 (Ti-6Al-4V)

[0101] Pre-plating treatment: normalizing

[0102] Performance requirements: nitrocarburizing layer + Ti / TiN alternate composite thick film layer, hardness 1800-2000Hv

[0103] Step 1: After the workpiece 3 is polished and ultrasonically cleaned and dried, it is loaded into the vacuum chamber 1 .

[0104] Step 2: Vacuum

[0105] The vacuum chamber 1 is vacuumed 4, and the vacuum degree reaches 2X10 -4 Pa.

[0106] Step 3: Workpiece 3 heating

[0107] Start the heating device 8, and the temperature of the workpiece 3 is 420°C.

[0108] Step 4: Preparation of modified layer by low temperature pulse ion nitrocarburizing

[0109] Adjust the vacuum degree of vacuum chamber 1 to 70Pa, feed ammonia gas 9, turn off argon gas 7, adju...

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Abstract

The invention discloses a steel and titanium alloy low-temperature pulse ion nitrocarburizing and cathode arc ion plating M/MN alternate plating thick-film technology, and belongs to the technical field of material surfaces. The technology is characterized in that the stress relief annealing is performed for a workpiece 3 by cold rolling or cold drawing; a nitrocarburizing layer and M/MN alternate composite thick-film layer with a mildly transitional hardness of a wear resistant layer on the surface of the workpiece is prepared to prevent the falling of a coating film; a transition layer with a thickness of 1-3 microns is formed between a modified layer and an ion plating M film layer to improve the adhesiveness of the coating film; ion plating M and MN alternate coating films are prepared; the ion plating M film can partially absorb the internal stress of the MN plating film; and the plating film is not liable to fall. The technology has the effects and benefits of solving low hardness and weak wear resistance of a titanium alloy, replacing electroplating hard chromium, having no environmental pollution, having no harm to human bodies and having wide application range, such as molds, machine tool parts, mine machinery, locomotives and piston rings.

Description

technical field [0001] The invention belongs to the technical field of material surface, and relates to low-temperature pulse ion nitrocarburizing and cathodic arc ion plating M / MN alternate thick film plating process, and prepares a nitrocarburizing layer whose hardness of a wear-resistant layer on the surface of a workpiece is in a moderate transition distribution+ M / MN alternating composite thick film layer; M stands for Cr, or Ti, or Al, or CrTiAl: N stands for nitrogen or NH 3 : MN represents CrN, or TiN, or AlN, or CrTiAlN. Background technique [0002] The current electroplating hard chrome process method: hanger-chemical degreasing-washing-drying-preheating-anodic treatment-impulse current-electrochrome plating-water washing-drying-inspection-packaging-warehousing, the problems in the electroplating process are: The use of acid-base salts seriously pollutes the environment, and hexavalent chromium is produced during the electroplating process, which is harmful to th...

Claims

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Application Information

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IPC IPC(8): C23C8/36C23C14/32C23C28/02
Inventor 董闯陈宝清陈大民张庆祥谷伟张吉祥胡小刚
Owner DALIAN UNIV OF TECH
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