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Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature

A technology of titanium aluminum alloy and oxidation resistance, which is applied in the field of long-term oxidation resistance at high temperature, can solve the problems of long-term oxidation resistance and oxide film adhesion that have not been reported, and achieve high-temperature long-term oxidation resistance and anti-stripping ability , the effect of reducing the oxidation rate

Inactive Publication Date: 2010-08-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wu et al. Wu Y, Umakoshi Y, Li X, et al. Isothermal Oxidation Behavior of Ti-50Al Alloy with Y Additions at 800 and 900°C. Oxidation of Metals. 2006, 66(5): 321 and Wu Y, Hagihara K, Umakoshi Y.Improvement of cyclic oxidation resistance of Y-containing TiAl-based alloys with equiaxial gamma microstructures.Intermetallics.2005,13(8):879 pointed out that the addition of an appropriate amount of Y element can improve the high-temperature oxidation resistance and oxidation resistance of TiAl alloy film peeling resistance, but its long-term oxidation resistance and oxide film adhesion have not been reported

Method used

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  • Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature
  • Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature
  • Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature

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Experimental program
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Effect test

Embodiment 1

[0031] The alloy whose nominal composition is Ti-45Al-7Nb-(0, 0.1, 0.3, 0.4, 0.6, 0.8) Y is smelted in vacuum. After homogenization, the wire is cut into a size of 10×10×1mm. 3 For thin slices, the six surfaces of the sample were ground to 1200 grit with SiC sandpaper from coarse to fine, and then ultrasonically cleaned in acetone for 15 min. The isothermal oxidation experiment was carried out in a box-type resistance furnace, the experimental medium was still air, and the experimental temperature was 900 °C. In order to ensure that the six surfaces of the sample are in contact with the air, the measured sample is placed obliquely in the corundum crucible, and the crucible is taken out after being oxidized for a certain period of time. After the sample is cooled, it is weighed. Put it into the furnace for oxidation, and the sample is oxidized for 1000h cumulatively. Figure 1 shows the oxidation weight gain curve. The Ti-45Al-7Nb-0.4Y alloy shows the best oxidation resistance,...

Embodiment 2

[0033] The alloy whose nominal composition is Ti-45Al-8Nb-(0, 0.1, 0.3, 0.4, 0.6, 0.8) Y is smelted in vacuum. After homogenization, the wire is cut into a size of 10×10×1mm. 3For thin slices, the six surfaces of the sample were ground to 1200 grit with SiC sandpaper from coarse to fine, and then ultrasonically cleaned in acetone for 15 min. The isothermal oxidation experiment was carried out in a box-type resistance furnace, the experimental medium was still air, and the experimental temperature was 900 °C. In order to ensure that the six surfaces of the sample are in contact with the air, the measured sample is placed obliquely in the corundum crucible, and the crucible is taken out after oxidizing for a certain period of time, and the sample is weighed after cooling. Put it into the furnace for oxidation, and the sample is oxidized for 1000h cumulatively. Figure 2 is the oxidation weight gain curve, the Ti-45Al-8Nb-0.1Y alloy shows the best oxidation resistance, and its ox...

Embodiment 3

[0035] The alloy with the nominal composition of Ti-45Al-8Nb-(0, 0.3, 0.4, 0.6, 0.8) Y is smelted in vacuum. After homogenization, the wire is cut into a size of 10×10×1mm. 3 Thin slices were drilled with electric sparks on one side of the sample, and the six surfaces of the sample were ground from coarse to fine to 1200 grit with SiC sandpaper, and then ultrasonically cleaned in acetone for 15 min. The sample was hung in the circulating oxidation furnace for the cyclic oxidation experiment. The experimental medium was still air, the experimental temperature was 900 °C, the high temperature oxidation in the furnace was 1 hour, and the room temperature outside the furnace was cooled for 12 minutes. After 300 cycles, the oxide film did not fall off obviously, but the oxide film fell off due to thermal stress in the cooling process after 300 cycles. Figure 3 shows the cyclic oxidation weight gain curve, and the oxidation rate increases with the increase of Y content.

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Abstract

The invention discloses a method for improving long-term oxidation resistance of a high-niobium titanium-aluminum alloy through adding yttrium at high temperature, belonging to the high temperature oxidization field of the metal material. The invention is characterized in that Y is added in a Ti 45Aa17Nb alloy or a Ti 45Al 8Nb alloy, a tiny yttrium doping high-niobium titanium-aluminum alloy complete lamellar structure is obtained after using vacuum melting and homogenization treatments; the alloy comprises the following components by atomic percent: 46.4-47.9% of Ti, 45% of Al, 7-8% of Nb and 0.1-0.8% of Y; and the homogenization treatment process comprises the following steps: heat insulation is carried out at a temperature of 1320 DEG C for 12h, a converter is insulated for 30 minutes at a temperature of 900 DEG C and then taken out for air cooling. The invention has the advantages that adding proper amount of Y increases the proportion of Al2O3 in an oxide film, reduces the thickness of the oxide film, refines particles producing the oxide, facilitates plastic deformation of the oxide film and reduces cracking of the film; and by epoxidation experiments, after all alloys containing Y go through 1000 cycle periods, no obvious shedding phenomenon occurs in the oxide film, and addition of Y improves the adhesion of the alloy oxide film and raises the use temperature of the high-niobium titanium-aluminum alloy to the temperature of more than 900 DEG C.

Description

technical field [0001] The invention belongs to the field of high-temperature oxidation of metal materials, and provides a method for improving the high-temperature long-term oxidation resistance of high-niobium-titanium aluminum alloy by adding yttrium element. technical background [0002] TiAl-based intermetallic compounds have low density, high melting point and high high temperature specific strength, and are considered to be the most promising new generation high temperature structural materials in aerospace, automotive, chemical and other industrial fields. Poor oxidation resistance has become a major obstacle limiting its practical application. The oxidation resistance of high Nb-TiAl alloys above 800 ℃ is much better than that of ordinary TiAl alloys. We first pointed out that Nb element can significantly improve the high temperature oxidation resistance of alloys in Corrosion1992; 48: 939. Since then, many scholars have experimentally proved that Nb The addition o...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C30/00
Inventor 林均品赵丽利李光燕张来启王艳丽叶丰陈国良张宁
Owner UNIV OF SCI & TECH BEIJING
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