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Method for raising resistance of Ti3AlC2 and Ti2AlC and their composite materials to molten salt corrosion

A composite material, anti-melting technology, applied in the field of anti-corrosion of molten salt, can solve problems such as poor thermal corrosion resistance, and achieve the effect of improved anti-corrosion of molten salt and simple method

Inactive Publication Date: 2005-09-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although Ti 3 AlC 2 and Ti 2 AlC has good high temperature strength (Acta, Mater Vol.50, 3141-3149, 2002; Mater. Res. Innovat. Vol.5, 87-93, 2001.), and has excellent high temperature oxidation resistance (KeyEng. Mater.Vol.224-226, 785-790, 2002; Corros.Sci.Vol.45, 891-907, 2003.), these properties make them very promising as high-temperature structural materials, experimental results show that Ti 3 AlC 2 、Ti 2 AlC and Ti 3 AlC 2 / Ti 2 AlC composites in molten salt (such as Na 2 SO 4 、K 2 SO 4 , NaCl, etc.) suffered from severe hot corrosion, in Ti 3 AlC 2 、Ti 2 AlC and Ti 3 AlC 2 / Ti 2 In the practical application of AlC composites, it is necessary to improve or overcome their shortcomings of poor thermal corrosion resistance in molten salt

Method used

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  • Method for raising resistance of Ti3AlC2 and Ti2AlC and their composite materials to molten salt corrosion
  • Method for raising resistance of Ti3AlC2 and Ti2AlC and their composite materials to molten salt corrosion
  • Method for raising resistance of Ti3AlC2 and Ti2AlC and their composite materials to molten salt corrosion

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Experimental program
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Effect test

Embodiment 1

[0020] Polished Ti 3 AlC 2 The bulk polycrystalline material was surface treated in still air at 980°C for 2 hours, and a dense oxide film was formed on the substrate after surface modification (see figure 1 ). Resistance to molten Na after surface modification 2 SO 4 The effect of corrosion is evaluated by the relationship between corrosion weight gain and exposure time measured by thermobalance. Compared with the sample without surface modification treatment, the sample after surface modification in air at 980 ° C for two hours is under air atmosphere Melting Na at 900°C 2 SO 4 Medium corrosion for 20 hours without weight gain (see figure 2 ), which shows that the sample after air surface modification treatment at 980 °C has excellent resistance to melting Na 2 SO 4 Corrosive; the sample without pre-oxidation treatment melts Na at 900 °C under air atmosphere 2 SO 4 After 20 hours of medium corrosion, the weight gain per unit area is 23.5mg / cm 2 , the corrosion la...

Embodiment 2

[0022] Polished Ti 2 AlC is placed in a tube furnace with a temperature controlled at 1160°C, and flowing air is introduced for 1 hour. Compared with the sample without surface modification treatment, the sample after surface modification treatment in air at 1160°C is in the air atmosphere Corrosion in molten NaCl at 900°C for 20 hours has no weight gain, which indicates that the protective oxide film formed after surface modification in flowing air at 1160°C avoids Ti 2 Reaction of AlC with molten NaCl.

Embodiment 3

[0024] Polished Ti 3 AlC 2 / Ti 2 AlC composites were surface treated in diluted oxygen at 950°C for 0.5 hours, and the partial pressure of oxygen was 0.1 atmosphere. After surface modification, a dense oxide film was formed on the substrate, and after surface modification, it was resistant to melting K 2 SO 4 Corrosivity has been greatly improved, and the sample after surface modification treatment in 950°C diluted oxygen for 0.5 hours was melted at 1000°C in air atmosphere K 2 SO 4 There is no weight gain after being corroded for 20 hours, which shows that the sample after oxygen surface modification treatment at 950 °C has excellent anti-melting K 2 SO 4 Corrosive; samples without surface modification are melted at 1000°C in air atmosphere K 2 SO 4 After 20 hours of corrosion, the corrosion layer is very thick, about 500 μm (see Figure 4 ), and the corroded layer of the sample after surface modification treatment is almost indistinguishable from that before corrosio...

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Abstract

The present invention relates to a technique for resisting molten salt corrosion, in the concrete, it is a method for raising Ti3AlC2, Ti2AlC and their composite material resistance to molten salt corrosion, and it is characterized by that the described material can be placed in the oxidative atmosphere to implement surface modification, its teatment temp. is 950-1280 deg.C and treatment time is 0.5-4 hr. After the Ti3AlC2, Ti3AlC and Ti3AlC / Ti2AlC composite material are undergone the process of surface modification treatment in the oxygen-containing at mosphere with 950-1280 deg.C, on their surface a compact oxide layer combined with base body well is formed, so that their surface resistance to molten salt corrosion can be greatly raised.

Description

technical field [0001] The invention relates to an anti-corrosion technology of molten salt, in particular to a method for improving Ti 3 AlC 2 、Ti 2 AlC or Ti 3 AlC 2 / Ti 2 Methods for AlC composites to resist molten salt corrosion. Background technique [0002] Ti 3 AlC 2 、Ti 2 AlC is a new type of ternary layered compound, which not only has many advantages of ceramic materials, such as high melting point, high modulus, high strength and low density, but also has some characteristics of metal materials, such as high electrical conductivity and high thermal conductivity. , has strong resistance to damage and can be machined. Therefore, Ti 3 AlC 2 、Ti 2 AlC and Ti 3 AlC 2 / Ti 2 AlC composite material is a new structure / function integrated material that is promising to be applied in high-tech fields such as aviation, aerospace, nuclear industry and electronic information, and is especially suitable as a high-temperature structural material. As a high-temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30C04B35/56
Inventor 周延春王晓辉闫程科
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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