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Nickel coating internal stress length change measuring method

A technology of length change and internal stress, applied in the direction of measuring force, measuring devices, instruments, etc., can solve problems such as failure of the manufacturing process, deformation of processed parts, cracking of the coating, etc., and achieve the effect of simple process, simple equipment, and simple operation

Inactive Publication Date: 2015-01-14
SUZHOU PTC OPTICAL INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the electroplating process, excessive tensile stress will cause cracking of the coating; excessive compressive stress will cause blistering of the coating, which will lead to failure of the coating.
In micro / nano-manufacturing, unbalanced tensile or compressive stresses can easily cause deformation of the machined parts, thus making the manufacturing process fail

Method used

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Embodiment Construction

[0011] In order to deepen the understanding of the present invention, the present invention will be described in further detail below with reference to the embodiments, which are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0012] An embodiment of the method for measuring the length change of stress in a nickel-plated layer of the present invention is to electrodeposit simultaneously on both sides of the sheet cathode. Although the sheet cathode is not bent, the length will change. When the coating produces tensile stress, The test piece is shortened; when the coating produces compressive stress, the test piece is elongated, and the sheet cathode is clamped on the fixing fixture, one end is fixed, and the other end is free, and a length sensor is installed at the free end to measure the change in length. Its calculation formula is:

[0013]

[0014] where σ is the internal stress of the coa...

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PUM

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Abstract

The invention discloses a nickel coating internal stress length change measuring method. By means of the nickel coating internal stress length change measuring method, nickel coating internal stress can be quickly and effectively measured, operation is simple, design is reasonable, procedures are simple, related equipment is simple, and measuring precision is high.

Description

[0001] technical field [0002] The invention relates to a method for measuring stress, in particular to a method for measuring the change of stress length in a nickel-plated layer. Background technique [0003] Nickel plating is one of the most important types of plating in the electroplating industry, and has been widely used in machinery, electronics, aviation, aerospace, national defense and other fields. Especially in recent years, the application of nickel plating in high-tech fields such as special processing and micro / nano manufacturing makes it more widely used. During the electroplating process, due to the certain deformation of the metal crystal or the infiltration of different phases, a certain internal stress will be generated, and this phenomenon is especially obvious in the nickel plating process. The internal stress of the electroplating layer can be divided into two categories: one is the stress that causes the volume of the coating to expand, which is call...

Claims

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Application Information

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IPC IPC(8): G01L1/00
Inventor 尚修鑫
Owner SUZHOU PTC OPTICAL INSTR