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Statistic measurement method of porosity and size distribution of thermal barrier coating

A thermal barrier coating, size distribution technology, used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. Measurement of closed porosity, etc.

Inactive Publication Date: 2018-03-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the weighing method cannot measure the pore size distribution; the mercury intrusion method cannot measure the closed porosity; the image method and some other methods are subjective and difficult to analyze experimentally, which makes the data have greater randomness and error

Method used

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  • Statistic measurement method of porosity and size distribution of thermal barrier coating
  • Statistic measurement method of porosity and size distribution of thermal barrier coating
  • Statistic measurement method of porosity and size distribution of thermal barrier coating

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Embodiment

[0035] Step 1: Take a cross-sectional sample from the plasma sprayed thermal barrier coating, the length (width) of which includes the full thickness of the coating is 1 mm, and the other direction is 1 mm. Inlaid and polished to ensure that the surface to be inspected is flat and parallel to the bottom surface. In this embodiment, the thermal barrier coating is ZrO 2 .

[0036] Step 2: On the basis of Step 1, in order to ensure good conductivity, a conductive carbon film can be evaporated on the polished surface. Paste the reference material (such as aluminum foil) on the edge of the coating with conductive tape and place it on the sample stage of the scanning electron microscope, set the accelerating voltage to 15KV; the electron beam current ensures that the dead time of the energy spectrometer is greater than 45%.

[0037] Step 3: On the basis of step 2, in the backscattered electron image mode, select a magnification of 200× to place the coating and aluminum foil in the...

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Abstract

The invention relates to a statistic measurement method of porosity and size distribution of thermal barrier coating, characterized by comprising: taking a full-thickness section sample from thermal barrier coating under measurement as a plane under detection; attaching a reference material to the edge of the plane under detection, placing on a scanning electron microscope stage, and setting a backscattering image contrast and pore recognition segmentation threshold for a scanning electron microscope; controlling the scanning electron microscope stage to move through an energy spectrometer, and setting an analysis area for automatic statistics of porosity; importing statistical data of porosity into Matlab, and performing classified statistics on the porosity in the thermal barrier coating. The scanning electron microscope is used with the energy spectrometer herein, multi-field one-by-one scanning is performed in the analysis area that is set, and recognizing and measuring are performed according to the pore contrast threshold.

Description

technical field [0001] The invention relates to the field of microstructure characterization of thermal barrier coatings, in particular to a statistical measurement method for porosity and size distribution of thermal barrier coatings. Background technique [0002] Ceramic-based thermal barrier coating materials are widely used in the hot end parts of aerospace engines, turbines, and steam turbines, which can effectively reduce the surface temperature of superalloys, thereby improving efficiency, reducing fuel consumption, and extending the life of hot end parts. Modern large aircraft and spacecraft operating in deep space require engines to have a greater thrust-to-weight ratio, so the turbine inlet temperature must be increased. The key is to improve the high temperature resistance of engine combustion chambers, turbine blades and other hot-end components. Thermal barrier coating materials are an important way to solve this problem. Studies have shown that the porosity of...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 王墉哲曾毅刘紫微华佳捷宋雪梅
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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