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Method for preparing anti-lock thread coating through PVD

An anti-locking and threading technology, which is applied in coating, metal material coating process, ion implantation plating, etc., can solve the problem of increasing the complexity of thread installation process, titanium alloy titanium alloy is difficult to electroplate, and lubricating paste is easy to fall off and fail, etc. problems, achieve good chemical stability, improve screw fastening force, and good chemical stability

Active Publication Date: 2015-03-25
西安赛福斯材料防护有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods to solve the problem of titanium alloy and stainless steel thread locking, such as coating the surface with ointment containing molybdenum disulfide, graphite, mica or talcum powder to lubricate the thread; using electrochemical treatment to increase the thickness of the passivation layer, Electroplating is used to prepare isolation coatings, etc., but it is difficult to achieve satisfactory results due to the limitations of the thread use environment and coating preparation process
For example, the lubricating paste is easy to fall off and fail to cause secondary pollution of the lubricant; electroplating and electrochemical treatment cause hydrogen embrittlement of titanium alloys and stainless steel materials, and titanium alloys are difficult to electroplate, all of which increase the complexity of the thread manufacturing and installation process. Meet the higher demands of threaded connections

Method used

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  • Method for preparing anti-lock thread coating through PVD
  • Method for preparing anti-lock thread coating through PVD

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The metal thread used in this embodiment is a 316 stainless steel thread, and the preparation method of the thread anti-lock coating is as follows:

[0027] Step 1. Polishing the surface of the metal thread by vibration polishing to remove the burrs on the surface of the metal thread, then using acetone ultrasonic cleaning to remove the oil stain on the surface of the polished metal thread, and then using alcohol ultrasonic dehydration treatment; the vibration polishing The abrasive used is white corundum particles with a particle size of 2 mm to 3 mm, and the time for vibration and polishing is 20 minutes;

[0028] Step 2. Perform sandblasting roughening treatment on the surface of the metal thread after dehydration treatment in step 1. The sand grains used in the sandblasting roughening treatment are 200-300 mesh steel balls, the sandblasting pressure is 0.5MPa, and the sandblasting time is 200s ;

[0029] Step 3. Place the metal thread after sandblasting and roughen...

Embodiment 2

[0035] The metal thread used in this embodiment is a TC4 titanium alloy thread, and the preparation method of the thread anti-lock coating is as follows:

[0036] Step 1. Polish the surface of the metal thread by vibrating light decoration to remove the burrs on the surface of the metal thread, then use an industrial cleaning agent solution to remove the oil on the surface of the polished metal thread, and rinse the surface of the metal thread after removing the oil. Hot air drying and dehydration after the cleaning agent; the abrasive used in the vibratory finishing is white corundum particles with a particle size of 1 mm to 5 mm, and the time for vibrating finishing is 15 minutes;

[0037] Step 2. Carry out sandblasting roughening treatment to the metal thread surface after dehydration treatment in step 1. The sand grains used in the sandblasting roughening treatment are 200 mesh to 300 mesh glass beads, the sandblasting pressure is 0.15MPa, and the sandblasting time is 20s;...

Embodiment 3

[0044] The metal thread used in this embodiment is a TA1 pure titanium thread, and the preparation method of the thread anti-lock coating is as follows:

[0045] Step 1. Polishing the surface of the metal thread by vibration polishing to remove the burrs on the surface of the metal thread, then using acetone ultrasonic cleaning to remove the oil stain on the surface of the polished metal thread, and then using alcohol ultrasonic dehydration treatment; the vibration polishing The abrasive used is white corundum particles with a particle size of 1 mm to 3 mm, and the time for vibration and polishing is 10 minutes;

[0046] Step 2. Carry out sandblasting roughening treatment to the metal thread surface after the dehydration treatment in step 1. The sand grains used in the sandblasting roughening treatment are 200 mesh to 300 mesh glass beads, the sandblasting pressure is 0.3MPa, and the sandblasting time is 10s;

[0047] Step 3. Place the metal thread after sandblasting and roug...

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Abstract

The invention discloses a method for preparing an anti-lock thread coating through PVD (physical vapor deposition). The method for preparing the anti-lock thread coating through PVD comprises the following steps: (1) polishing the surface of a metal thread, removing oil stain, and dewatering; (2) spraying sand to roughen the surface of the metal thread; (3) putting the metal thread into vacuum cathodic arc deposition equipment, and sputter-etching to obtain a surface activated metal thread; (4) introducing argon into the vacuum cathodic arc deposition equipment, and plating a film on the surface activated metal thread for the first time to obtain a metal thread with a nickel coating on the surface; and (5) plating a film on the metal thread for the second time in an argon atmosphere by using a pure-silver cathodic arc source to obtain a metal thread with a nickel composite coating on the surface. Because the wear resistant anti-lock coating is prepared on the surface of the metal thread through PVD, the prepared wear resistant anti-lock thread coating has a strong bonding force, can resist corrosion, is low in friction coefficient and is highly reliable, the purposes of improving the fastening force of a screw and preventing the metal thread from being occluded and locked can be achieved, and the metal thread can serve a long time under heavy load, corrosion and other harsh environment.

Description

technical field [0001] The invention belongs to the technical field of thread anti-lock coating preparation, and in particular relates to a method for preparing a thread anti-lock coating by PVD. Background technique [0002] With the demand for threaded fasteners with high strength and good corrosion resistance in the fields of aerospace and shipbuilding, threaded fasteners made of titanium alloy and stainless steel are widely used. Usually, the chemical activity of these metals is relatively high, because The dense passivation layer produced on the surface makes the corrosion resistance of the material better than ordinary steel fasteners. However, titanium alloys and stainless steel have low surface hardness, poor wear resistance, and are more sensitive to adhesive wear. Under the condition of high torque and heavy load, the local friction and temperature rise between the threads will destroy the passivation layer on the surface of the material, causing the metal to dire...

Claims

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Application Information

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IPC IPC(8): C23C14/46C23C14/16
Inventor 王宝云高广睿王彦峰李争显屈静罗晓峰
Owner 西安赛福斯材料防护有限责任公司
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