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Method for preparing sample for measuring thermal expansion coefficient of sprayed coating

A thermal expansion coefficient and sample technology, which is used in the preparation of samples for measuring the thermal expansion coefficient of spray coatings, can solve the problems of inability to replicate the authenticity of the spray coating process, different coating structures, structures, and different expansion coefficients.

Inactive Publication Date: 2010-11-03
GRIPM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there are many factors affecting the measurement of the thermal expansion coefficient of the coating by powder metallurgy, including powder particle size, powder composition uniformity, pressing pressure, sintering temperature, sintering time, porosity of the sample after pressing, pore size, pore distribution, etc. etc., the authenticity of the spraying process cannot be copied to the powder metallurgy parts
In addition, due to the difference in specific functions and costs during spraying, different processes are often used for the preparation of coatings. In this case, even the same material will cause different structures in the coating, Tissues are different, resulting in different coefficients of expansion

Method used

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  • Method for preparing sample for measuring thermal expansion coefficient of sprayed coating
  • Method for preparing sample for measuring thermal expansion coefficient of sprayed coating
  • Method for preparing sample for measuring thermal expansion coefficient of sprayed coating

Examples

Experimental program
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Effect test

Embodiment 1

[0020] This embodiment is plasma sprayed Al 2 o 3 Preparation of samples for the determination of the coefficient of thermal expansion of the coating. A groove with a size of 70 mm × 7 mm × 12 mm (length × depth × width) is processed on the cuboid graphite substrate ( figure 1 Shown), use cleaning gasoline, alcohol or acetone to degrease the groove part (the degreasing method of the following examples is the same as this) and low-pressure sandblasting and texturing. When the surface of the groove is sandblasting and texturing, use a smaller force to Do not destroy the shape and size of the groove edge of the graphite substrate, and then use the plasma spraying process to spray Al on the graphite substrate 2 o 3 During intermittent spraying, ensure that the temperature rise of the substrate surface is lower than 150°C to prevent premature separation of the coating from the substrate due to overheating until Al 2 o 3 Cover the groove completely, and then use a hacksaw to cu...

Embodiment 2

[0022] This embodiment is supersonic flame spraying (HVOF) NiCr-Cr 3 C 2 Preparation of samples for the determination of the coefficient of thermal expansion of the coating. A groove with a size of 70 mm × 7 mm × 12 mm (length × depth × width) is processed on the cylindrical graphite substrate ( figure 2 Shown), degreasing the groove part and low-pressure sandblasting texturization, using a small force when sandblasting the surface of the groove, so as not to damage the shape and size of the groove edge of the graphite matrix, and then using a supersonic flame Spraying NiCr-Cr on Graphite Substrate by Spraying Process 3 C 2 Coating, during which an intermittent spraying process is used to prevent premature separation of the coating from the substrate due to overheating, until NiCr-Cr 3 C 2 Cover the groove completely, then use a hacksaw to cut along the edge of the graphite outside the groove, and take out the NiCr-Cr 3 C 2 The sample is then ground to a size of 65mm×5...

Embodiment 3

[0024] This example is the preparation of a sample for measuring the coefficient of thermal expansion of an arc sprayed stainless steel coating. A groove with a size of 40mm×6mm×7mm (length×depth×width) is processed on the cuboid gypsum substrate ( figure 1 As shown), degrease the groove part and roughen it with low pressure sandblasting. When sandblasting the surface of the groove, use a small force to ensure that the shape and size of the groove edge of the gypsum matrix are not damaged, and then use the arc spraying process Spray the stainless steel coating on the gypsum base, and use the intermittent spraying process until the stainless steel completely covers the groove, then use a hacksaw to cut along the edge of the gypsum outside the groove, take out the stainless steel sample, and then grind it. To a size of 25mm×4mm×4mm (length×height×width), the parallelism deviation of the left and right end faces is less than 0.05 ( image 3 shown). The samples at this time can ...

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Abstract

The invention belongs to the technical field of preparation of a sprayed coating thermal expansion coefficient sample and discloses a method for preparing a sample for measuring thermal expansion coefficient of a sprayed coating. The method comprises the following steps of: processing a groove on graphite or gypsum serving as a substrate, deoiling the surface of the groove and then sandblasting and roughening; spraying a coating at the groove of the substrate by a spraying process until the groove is completely covered by the coating, wherein an intermittent spraying mode is adopted in the spraying process to prevent the coating from being separated from the substrate untimely due to overheat; after the spraying is finished, slowly cutting the graphite or gypsum substrate on the outer side of the edge of the sample at the groove with a tool until the sample is completely taken out; and performing subsequent processing to obtain a sample with the size and shape required by measuring the thermal expansion coefficient. The sample prepared by the method can fully and effectively measure the thermal expansion coefficient of the coatings prepared by various spraying processes.

Description

technical field [0001] The invention belongs to the technical field of preparation of thermal expansion coefficient samples of sprayed coatings, in particular to a preparation method for measuring thermal expansion coefficient samples of sprayed coatings. Background technique [0002] Thermal spraying is to use a heat source to heat metal or non-metallic materials to a molten or semi-molten state, atomize them into tiny particles through a high-speed airflow, and spray them on the surface of the treated workpiece to form a coating, so that the surface of the workpiece is wear-resistant and durable. Corrosion, heat resistance, oxidation resistance, heat insulation, insulation, electrical conductivity, sealing, anti-microwave radiation and other special physical and chemical properties of a process. [0003] Thermal spraying materials can be in the form of powder, wire and rod, and they are mainly used to prepare coatings with properties such as wear resistance, corrosion resi...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N25/16
Inventor 杨中元李学锋付东兴陶凯
Owner GRIPM ADVANCED MATERIALS CO LTD
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