Method for improving high-temperature creep performance of titanium alloy substrate

A high-temperature creep, titanium alloy technology, applied in metal material coating process, coating, melting spray plating, etc., can solve the effect of increasing the probability of brittle phase precipitation, increasing structural instability, and improving the creep resistance of alloys limited and other problems, to achieve the effect of inhibiting oxidation resistance, improving bonding strength, and alleviating thermal mismatch stress

Active Publication Date: 2020-06-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive alloying will increase the probability of brittle phase precipitation and increase the microstructure instability of titanium alloys after long-term service
Conventional heat treatment methods have limited effect on improving the creep resistance of alloys

Method used

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  • Method for improving high-temperature creep performance of titanium alloy substrate
  • Method for improving high-temperature creep performance of titanium alloy substrate
  • Method for improving high-temperature creep performance of titanium alloy substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this example, TA32 titanium alloy is used as the base material, which is an α-type titanium alloy with a size of Φ10×185mm, and the composition mass percentages are: 5.5% Al, 3.5% Sn, 3.0% Zr, 0.7% Mo, 0.3% Si, 0.4% Nb, 0.4% Ta, and the rest is Ti. The coating is a heat-blocking functional layer composed of a base layer and a surface layer, the material of the base layer is NiCrAlY (NiCrAlY), and the material of the surface layer is YSZ.

[0041] The thickness of the bottom layer is 80 μm, and the thickness of the surface layer is 300 μm.

[0042] The specific implementation steps of preparing the thermal barrier functional layer on the surface of TA32 titanium alloy high temperature creep sample by high-energy plasma spraying technology are as follows:

[0043] 1) Substrate surface pretreatment

[0044] The surface of the TA32 titanium alloy used as the base material was degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone solut...

Embodiment 2

[0050] 1) Substrate surface pretreatment

[0051] The surface of the β-type titanium alloy used as the base material was degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone solution, then put into a drying oven for drying, and finally roughened with white corundum (#30). The process parameters are: gas pressure 0.6MPa, distance 80mm, angle 45°, roughness (Ra) value reaches 10.5μm.

[0052] 2) The treated substrate is preheated with high-energy plasma, and the specific process parameters are: current 300A, voltage 150V, argon flow rate 50L / min; the preheating temperature is controlled at about 90°C.

[0053] 3) Coating NiCrAlY metal powder on the surface of the preheated substrate by high-energy plasma spraying technology to form a bottom layer, and then spraying ceramic powder YSZ on the bottom layer by using high-energy plasma spraying technology to form a ceramic surface layer, the bottom layer The thickness is 50 μm, and the thickness...

Embodiment 3

[0055] 1) Substrate surface pretreatment

[0056] The surface of the α-type titanium alloy used as the base material is degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone solution, then placed in a drying oven for drying, and finally roughened with white corundum (#30). The process parameters are: gas pressure 0.7MPa, distance 9cm, angle 60°, roughness (Ra) value reaches 11μm.

[0057] 2) The treated substrate is preheated with high-energy plasma, and the specific process parameters are: current 320A, voltage 120V, argon flow rate 40L / min; the preheating temperature is controlled at about 80°C.

[0058] 3) Coating NiCrAlY metal powder on the surface of the preheated substrate by high-energy plasma spraying technology to form a bottom layer, and then spraying ceramic powder YSZ on the bottom layer by using high-energy plasma spraying technology to form a ceramic surface layer, the bottom layer The thickness is 100 μm, and the thickness o...

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Abstract

The invention relates to a method for improving the high-temperature creep performance of a titanium alloy substrate. According to the method for improving the high-temperature creep performance of the titanium alloy substrate, the high-energy plasma spray-plating technology is used for preparing a nickel-based alloy bottom layer and a ceramic surface layer on the surface of a titanium alloy to obtain a thermal-barrier function layer with high bonding and no influence on the surface structure of the substrate. The process flow is controlled strictly with reasonable spray-plating process parameters, so that the porosity of a coating is controlled within a reasonable range, and the comprehensive mechanical properties are effectively improved. The deposited thermal barrier function layer caneffectively restrain the creep deformation of the titanium alloy substrate while effectively improving the high temperature oxidation resistance and thermal insulation performance of the titanium alloy, and the service life of the titanium alloy part is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and in particular relates to a method for improving the high-temperature creep performance of a titanium alloy substrate. Background technique [0002] Titanium alloy is an important structural metal material developed in the 1950s. It has the characteristics of high specific strength, high specific modulus, good corrosion resistance and excellent high and low temperature performance. As a very promising new structural material, titanium alloys are widely used in aerospace, shipbuilding, biomedical, sports equipment, chemical energy and other fields, and have become indispensable important metal materials for new technologies, new processes, and new equipment. Some titanium alloy workpieces have been served in high temperature conditions for a long time, and at the same time bear complex alternating mechanical loads, which will cause creep deformation of the structure until the parts fai...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/073C23C4/11C23C4/02
CPCC23C4/02C23C4/073C23C4/11C23C4/134
Inventor 白宇赵彬柳琪种南京孙艺闻
Owner XI AN JIAOTONG UNIV
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