Method of raising the medium temperature antioxygenation of Ti3AlC2

An anti-oxidation and anti-oxidation technology, applied in the field of anti-oxidation, can solve the problems of application limitations, poor anti-oxidation, etc., achieve good anti-oxidation ability, and combine good effects

Inactive Publication Date: 2004-06-23
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

Although Ti 3 AlC 2 It has good high temperature oxidation resistance, but due to the poor oxidation resistance of this material at medium temperature (500-600 ° C), its application as a high temperature structural material is greatly limited
[0003] Although Ti 3 AlC 2 It has good high-temperature oxidation resistance (Key Eng. Mater. Vol. 224-226, 785-790 (2002)), but because the oxide layer generated by this material in the temperature range of medium temperature (500-600 ° C) has Microcracks make it poor in oxidation resistance (J.Mater.Chem.Vol.12, 2781-2785(2002)), limiting its application as a high-temperature structural material

Method used

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  • Method of raising the medium temperature antioxygenation of Ti3AlC2
  • Method of raising the medium temperature antioxygenation of Ti3AlC2
  • Method of raising the medium temperature antioxygenation of Ti3AlC2

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Effect test

Embodiment 1

[0014] Ti 3 AlC 2 Expose to still air, the treatment temperature is 1000°C, the pre-oxidation (holding) time is 2 hours, the furnace is cooled, and a protective oxide film is formed after pre-oxidation ( figure 1 ). The pre-oxidation effect is evaluated by the relationship between the oxidation gain and the exposure time measured by the thermobalance. Compared with the sample without oxidation treatment, the sample after pre-oxidation treatment in air at 1000 °C for two hours is oxidized in air at 600 °C for 20 The weight gain per hour decreased significantly, only 1 / 50 of the unoxidized sample, and the oxidation kinetics followed the parabolic law, rather than the linear law of the unoxidized sample (see figure 2 ). This shows that the samples pre-oxidized in air at 1000°C have good long-term oxidation resistance.

[0015] Ti 3 AlC 2 The preparation of the bulk polycrystalline material adopts the method described in the patent application (application number 00123203.7...

Embodiment 2

[0019] Ti 3 AlC 2 Placed in flowing oxygen, the treatment temperature is 1100 ° C, the pre-oxidation (holding) time is 1 hour, furnace cooling, compared with the sample without oxidation treatment, the oxidation of the sample after pre-oxidation treatment in air at 1100 ° C is 20 The hourly weight gain decreased significantly, only 1 / 50 of the unoxidized sample, and the oxidation kinetics of oxidation at 600 ° C for 20 hours followed the parabolic law, not the linear law of the unoxidized sample.

Embodiment 3

[0021] Ti 3 AlC 2 Expose to flowing dilute oxygen, the partial pressure is 0.1Pa, the treatment temperature is 1200°C, the pre-oxidation (holding) time is 3 hours, the furnace is cooled, the protective oxide film formed after pre-oxidation is further thickened, and at 600°C After 100 hours of oxidation, the weight gain is only 0.12mg / cm 2 . Figure 4 gives the Ti after preoxidation in air at 1200°C for 3 hours 3 AlC 2 Fracture scanning electron micrographs of oxidation at 600°C for 100 hours. It shows that even if it is oxidized for a long time (100 hours), the oxide layer is well combined with the substrate, and no voids and cracks are found between the oxide layer and the substrate.

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Abstract

The present invention relates to antioxidation technology, and is especially method of raising the medium temperature antioxidation performance of Ti3AlC2. Ti3AlC2 is treated in oxidizing atmosphere at 1000-1300 deg.c for 0.5-4 hr to preoxidize and the said oxidizing atmosphere is static or flowing air, oxygen or diluted oxygen. The said process can produce oxide layer well combined with the base body and without holes and cracks, and this can raise the medium temperature antioxidation performance of Ti3AlC2.

Description

technical field [0001] The invention relates to the technical field of anti-oxidation, in particular to a method for improving Ti 3 AlC 2 Method for mesophilic oxidation resistance. Background technique [0002] Ti 3 AlC 2 It is a new type of ternary layered compound, which not only has many advantages of ceramic materials, such as high melting point, high modulus (Young's modulus 297GPa, shear modulus 124GPa), high strength, etc.; it also has some advantages of metal materials. Characteristics, such as high electrical conductivity, high thermal conductivity, strong resistance to damage and machinability, etc. Furthermore, since Ti 3 AlC 2 Low density (4.2g / cm 3 ), is a new type of structure / function integrated material that is promising to be applied in high-tech fields such as aviation, aerospace, nuclear industry and electronic information. Although Ti 3 AlC 2 It has good high temperature oxidation resistance, but because of the poor oxidation resistance of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C22C29/10
Inventor 周延春王晓辉
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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