Method for quantitative evaluation of degree of alloying of NiCrAlY alloy powder prepared by mechanical alloying

A technology of mechanical alloying and alloying degree, which is applied to quantitatively evaluate the alloying degree of NiCrAlY alloy powder prepared by mechanical alloying.

Inactive Publication Date: 2015-02-11
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no method that can quantitatively evaluate the alloying degree of NiCrAlY alloy powder prepared by mechanical alloying, resulting in the inability to effectively establish the quantitative relationship between the alloying degree and the microstructure and high-temperature oxidation resistance of NiCrAlY coatings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) The chemical composition is Ni20Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mechanically stirred and mixed evenly to form a mechanically stirred composite powder. The mass percentage of pure Al powder in the mechanically composite powder is 5%. The temperature of the mechanically stirred composite powder is measured by differential thermal analysis at 27~1280°C Differential thermal analysis curve at high temperature, and measure the endothermic peak area in the range of 600~700℃ as S 0 =30.1μV·s / mg;

[0013] (2) The chemical composition is Ni20Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mixed evenly on a high-energy ball mill to form a mechanically alloyed NiCrAlY alloy powder. The mass percentage of pure Al powder in the mechanically alloyed NiCrAlY alloy powder is 5%. The mechanically alloyed formula is measured by differential thermal analysis. Differential thermal analysis curve of NiCrAlY alloy powder at 27~1280℃, and the measure...

Embodiment 2

[0016] (1) The chemical composition is Ni25Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mechanically stirred and mixed evenly to form a mechanically stirred composite powder. The mass percentage of pure Al powder in the mechanically composite powder is 15%. The temperature of the mechanically stirred composite powder is measured by differential thermal analysis at 27~1280°C Differential thermal analysis curve at high temperature, and measure the endothermic peak area in the range of 600~700℃ as S 0 =38.6μV·s / mg;

[0017] (2) The chemical composition is Ni25Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mixed evenly on a high-energy ball mill to form a mechanically alloyed NiCrAlY alloy powder. The mass percentage of pure Al powder in the mechanically alloyed NiCrAlY alloy powder is 15%. The mechanically alloyed formula is measured by differential thermal analysis. Differential thermal analysis curve of NiCrAlY alloy powder at 27~1280℃, and the measu...

Embodiment 3

[0020] (1) The chemical composition is Ni30Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mechanically stirred and mixed evenly to form a mechanically stirred composite powder. The mass percentage of pure Al powder in the mechanically composite powder is 25%. The temperature of the mechanically stirred composite powder is measured by differential thermal analysis at 27~1280°C Differential thermal analysis curve at high temperature, and measure the endothermic peak area in the range of 600~700℃ as S 0 =43.7μV·s / mg;

[0021] (2) The chemical composition is Ni30Cr alloy powder, pure Al powder and Y 2 o 3 The powder is mixed evenly on a high-energy ball mill to form a mechanically alloyed NiCrAlY alloy powder. The mass percentage of pure Al powder in the mechanically alloyed NiCrAlY alloy powder is 25%. The mechanically alloyed formula is measured by differential thermal analysis. Differential thermal analysis curve of NiCrAlY alloy powder at 27~1280℃, and the measu...

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Abstract

The invention discloses a method for quantitative evaluation of the degree of alloying of NiCrAlY alloy powder prepared by mechanical alloying. The method comprises the following steps of: performing mechanical stirring and uniform mixing on NiCr alloy powder, pure Al powder and Y2O3 powder to form mechanically stirred composite powder, measuring a differential thermal analysis curve of the composite powder, and calculating the endothermic peak area S0 in an endothermic temperature range; and calculating the endothermic peak area S1 in the endothermic temperature range, wherein the formula for evaluation of the degree of alloying of the NiCrAlY alloy powder prepared by mechanical alloying is shown in the specification. According to the method, the degree of alloying of the NiCrAlY alloy powder prepared by mechanical alloying can be effectively, quickly and quantitatively evaluated, and the method has very important theoretical significance and application values for optimizing chemical components and process parameters of the NiCrAlY alloy powder prepared by mechanical alloying and controlling the microstructure and performance of a laser-clad NiCrAlY coating.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the alloying degree of NiCrAlY alloy powder prepared by mechanical alloying, belonging to the field of material science and technology. Background technique [0002] NiCrAlY alloy powder is usually prepared by plasma spraying method on the surface of high temperature alloy to form a bonding layer of thermal barrier coating or a high temperature protective coating used alone, which greatly improves the high temperature oxidation resistance of parts. However, the coatings prepared by plasma spraying have disadvantages such as high porosity, easy cracking, and poor mechanical bonding with the substrate. Laser cladding technology has the advantages of high energy density, optional and controllable processing area, small heat-affected zone and thermal deformation of the substrate, fine and dense coating microstructure, and high metallurgical bonding with the substrate. High temperature resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
Inventor 周圣丰戴晓琴张天佑吴超
Owner NANCHANG HANGKONG UNIVERSITY
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