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A kind of tial3/al2o3 composite powder and its preparation method and application

A composite powder and powder technology, applied in the field of preparation of high temperature protective coatings for titanium alloys, can solve the problems of high brittleness of coatings, prone to cracks, and fast degradation of coatings, and achieve uniform distribution of two phases, easy control of components, and easy operation. Simple process effect

Active Publication Date: 2018-11-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these aluminide coatings have improved the oxidation resistance of the substrate to a certain extent, they still have deficiencies. On the one hand, the coating is brittle and prone to cracks; Lead to rapid coating degradation, see literature [3-9]:

Method used

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  • A kind of tial3/al2o3 composite powder and its preparation method and application
  • A kind of tial3/al2o3 composite powder and its preparation method and application
  • A kind of tial3/al2o3 composite powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Pure Al powder with a particle size of 5-30 μm and nano-TiO 2 The powders were mixed at a mass ratio of 3:1 and then high-energy ball milled for 2 hours, and the powder after high-energy ball milling was heat-treated at 650°C for 10 hours to prepare TiAl 3 / Al 2 o 3 Composite powder, composite powder deposited on γ-TiAl matrix alloy by cold spraying equipment, operating temperature 500°C, operating pressure 1.8MPa, coating thickness 20μm, two-phase distribution in the composite coating is uniform.

[0036] Such as figure 1 As shown, the particle size of the composite powder is in the range of 30-80 μm. Such as figure 2 As shown, the thickness of the composite coating is about 20 μm, and it is well combined with the substrate. Such as image 3 As shown, the interdiffusion between the composite coating and the substrate is significantly weakened after high temperature oxidation. Experimental results show that the coating has good high temperature oxidation resista...

Embodiment 2

[0038] Pure Al powder with a particle size of 5-30 μm and nano-TiO 2 The powders were mixed at a mass ratio of 2:1 and then high-energy ball milled for 1 h, and the powder after high-energy ball milling was heat-treated at 750 °C for 10 h to prepare TiAl 3 / Al 2 o 3 Composite powder, the composite powder prepared by depositing on the γ-TiAl matrix alloy with cold spraying equipment, the operating temperature is 600°C, the operating pressure is 2.0MPa, and the coating thickness is 30μm. Experimental results show that the coating has good high temperature oxidation resistance. The performance index of this example is: the weight gain of the coating is less than 2.5mg / cm after isothermal oxidation at 900°C for 500h 2 .

Embodiment 3

[0040] Pure Al powder with a particle size of 5-30 μm and nano-TiO 2 The powders were mixed at a mass ratio of 1:1 and then high-energy ball milled for 2 hours, and the powder after high-energy ball milling was heat-treated at 850°C for 10 hours to prepare TiAl 3 / Al 2 o 3 Composite powder, composite powder prepared by depositing on Ti-22Al-26Nb matrix alloy with cold spraying equipment, operating temperature 500°C, operating pressure 1.8MPa, coating thickness 10μm. Experimental results show that the coating has good high temperature oxidation resistance. The performance index of this example is: the weight gain of the coating is less than 2.0 mg / cm after cyclic oxidation at 900 ° C for 100 times 2 .

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Abstract

The invention relates to a preparation technology of a titanium alloy high-temperature protective coating and particularly relates to TiAl3 / Al2O3 composite powder as well as a preparation method and application thereof. The preparation method comprises the steps of firstly, carrying out thermal treatment after carrying out high-energy ball milling on pure Al and TiO2 nanopowder according to a certain ratio for a certain time to obtain the TiAl3 / Al2O3 composite powder; and then, spraying the prepared composite powder on a titanium alloy substrate at the temperature of 100-700 DEG C and the pressure of 0.3-5.0MPa by using a cold gas dynamic spraying method to form a TiAl3 / Al2O3 composite coating. The coating comprises the components of TiAl3 and Al2O3, wherein Al2O3 is uniformly distributed in the coating, and the coating is more than 10mu m thick. The preparation method disclosed by the invention is simple in operation, the components are easily controlled, the obtained coating is low in porosity, good in compatibility with matrix and binding force and relatively good in high-temperature oxidation resistance, the mutual diffusion between the coating and the matrix can be greatly reduced, and the problem of high-temperature oxidation of titanium alloy can be favorably solved.

Description

Technical field: [0001] The invention relates to the preparation technology of titanium alloy high temperature protective coating, specifically a kind of TiAl 3 / Al 2 o 3 Composite powder and its preparation method and application. Background technique: [0002] Ti-Al alloys, especially α-Ti 3 Al, γ-TiAl and O-phase Ti 2 AlNb alloy has low density, high strength, high melting point and excellent creep resistance, and can be widely used in high-temperature parts of automobiles or aero-engines, and is a promising lightweight high-temperature material. See literature [1] H.Clemens, and H.Kestler, Processing and Applications of Intermetallicγ‐TiAl‐Based Alloys, Adv.Eng.Mater., 2000, 2(9), p 551-570. However, the high-temperature oxidation resistance of Ti-Al alloys is insufficient, especially when the service temperature exceeds 800 °C, non-protective TiO is formed on the surface. 2 At the same time, oxygen will penetrate into the matrix and form a solid solution with the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04
Inventor 熊天英王吉强孔令艳吴杰毛天亮李铁藩
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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