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A high-strength plastic titanium alloy resistant to high temperature oxidation at 800 ℃

A high-temperature oxidation and titanium alloy technology, applied in the field of new materials, can solve the problem that the operating temperature cannot exceed 600°C, and achieve the effects of excellent high-temperature oxidation resistance, excellent comprehensive performance, and excellent high-temperature oxidation resistance at 800°C

Active Publication Date: 2017-11-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-temperature titanium alloy structural material for aerospace engines that is resistant to high-temperature oxidation at 800°C, high in corrosion resistance, and has excellent comprehensive mechanical properties in view of the shortage that the current service temperature of high-temperature titanium alloys cannot exceed 600°C.

Method used

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  • A high-strength plastic titanium alloy resistant to high temperature oxidation at 800 ℃
  • A high-strength plastic titanium alloy resistant to high temperature oxidation at 800 ℃

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Ti 86.47 Al 6.01 Sn 2.82 Zr 3.61 Ta 0.72 Si 0.37 alloy

[0015] Step 1: Alloy Preparation

[0016] Ti 86.47 Al 6.01 Sn 2.82 Zr 3.61 Ta 0.72 Si 0.37 alloy, the composition is derived from the cluster type [Al-(Ti 13.7 Zr 0.3 )](Al 0.69 Sn 0.18 Si 0.1 Ta 0.03 ). The pure metals of Ti, Al, Sn, Zr, Ta and Si are prepared according to the given alloy weight percentage; Smelting is carried out under the protection, and the smelting is repeated 3 times to obtain an alloy ingot with uniform composition; then the alloy ingot with uniform smelting is finally melted, and the melt is sucked into the cylindrical copper mold cavity by the copper mold suction casting process to obtain a rod with a diameter of 6mm. The φ6mm alloy rod was solution-treated at 950 °C for 1 h, then water quenched, and then aged at 560 °C for 6 h.

[0017] Step 2: Alloy structure and performance testing

[0018] The alloy structure was detected by XRD, and it was determined t...

Embodiment 2

[0019] Example 2: Ti 86.64 Al 6.02 Sn 2.82 Zr 3.61 Ta 0.36 Nb 0.18 Si 0.37 alloy

[0020] Step 1: Alloy Preparation

[0021] Ti 86.64 Al 6.02 Sn 2.82 Zr 3.61 Ta 0.36 Nb 0.18 Si 0.37 Alloy, [Al-(Ti 13.7 Zr 0.3 )](Al 0.69 Sn 0.18 Si 0.1 -Ta 0.015 Nb 0.015 ). Same as step 1 in embodiment 1.

[0022] Step 2: Alloy structure and performance testing

[0023]The structure of the alloy was detected by XRD, and it was determined to be a single HCP-α solid solution structure; its performance parameters were tested by micro Vickers hardness tester, muffle furnace, MTS testing machine and Gamry electrochemical workstation, respectively: hardness HV=378kgf·mm -2 , oxidative weight gain G after oxidation at 800℃ for 100h + =3.9mg / cm 2 , the room temperature tensile strength σ b =1032MPa, tensile strength σ at 650℃ b =580MPa, 650℃ plastic ε%=51%, self-corrosion voltage E in 3.5%NaCl solution corr =-0.23V, corrosion rate R=2.1μm / a.

Embodiment 3

[0024] Example 3: Ti 86.67 Al 6.03 Sn 2.82 Zr 3.62 Mo 0.13 Ta 0.24 Nb 0.12 Si 0.37 alloy

[0025] Step 1: Alloy Preparation

[0026] Ti 86.67 Al 6.03 Sn 2.82 Zr 3.62 Mo 0.13 Ta 0.24 Nb 0.12 Si 0.37 Alloy, [Al-(Ti 13.7 Zr 0.3 )](Al 0.69 Sn 0.18 -Si 0.1 Mo 0.01 Ta 0.01 Nb 0.01 ). Same as step 1 in embodiment 1.

[0027] Step 2: Alloy structure and performance testing

[0028] The alloy structure was detected by XRD, and it was determined to be a single HCP-α solid solution structure; its performance parameters were tested by micro Vickers hardness tester, muffle furnace, MTS testing machine and Gamry electrochemical workstation, respectively: hardness H V =376kgf·mm -2 , oxidative weight gain G after oxidation at 800℃ for 100h + =5.6mg / cm 2 , the room temperature tensile strength σ b =1190MPa, tensile strength σ at 650℃ b =580MPa, 650℃ plastic ε%=60%, self-corrosion voltage E in 3.5%NaCl solution corr =-0.27V, corrosion rate R=1.7μm / a.

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Abstract

The invention provides a high-strength and high-plasticity titanium alloy with resistance to high-temperature oxidation at 800 DEG C and belongs to the technical field of novel materials. The high-strength and high-plasticity titanium alloy comprises the following elements: Ti, Al, Sn, Zr, Hf, Mo, Ta, Nb and Si, wherein the alloy comprises the following components in percentage by weight: 5.7-6% of Al, 2.7-3% of Sn, 3.5-6.9% of Zr and Hf, 0.2-0.9% of Mo, Nb and Ta, 0.3-0.4% of Si and the balance of Ti. The high-strength and high-plasticity titanium alloy has the advantages that the addition content ratio of the component elements of the titanium alloy is reasonable due to alloy design, the alloy prepared on the basis of ensuring that the Ti alloy has single HCP-alpha phase structure has excellent resistance to high-temperature oxidation and excellent comprehensive mechanical property at 800 DEG C, and the titanium alloy is a low-cost aerospace engine material.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a high-temperature titanium alloy structural material for aerospace engines, which is resistant to 800° C. high-temperature oxidation, has high corrosion resistance and has excellent comprehensive mechanical properties. Background technique [0002] High temperature near α-Ti alloy has the advantages of low density, strong high temperature oxidation resistance, strong corrosion resistance and excellent comprehensive mechanical properties, and is the main structural material of aerospace engines. The use temperature of high-temperature titanium alloys is constantly mentioned with the design requirements of aero-engines. At present, the maximum operating temperature is 600 °C. Table 1 lists the typical grades and components of high-temperature titanium alloys with a service temperature of more than 500 °C. It can be seen that in order to ensure the Ti alloys For service perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22F1/183
Inventor 王清董闯王英敏羌建兵车晋达
Owner DALIAN UNIV OF TECH
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