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MAX phase ceramic and composite material surface modification processing method thereof

A composite material and surface modification technology, applied in anodizing and other directions, can solve the problems of lack of necessity, difficulty in realizing plasma discharge, and inability to perform micro-arc oxidation treatment, and achieve the effect of broadening the application field, compact structure and smooth surface.

Active Publication Date: 2015-09-23
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

This is because: first of all, compared with oxide ceramics, conventional carbide or nitride ceramics have the characteristics of high hardness and good thermal stability, so it is not necessary to perform micro-arc oxidation treatment; secondly, most conventional carbides Or nitride ceramics are insulators at low temperatures, it is difficult to achieve plasma discharge, and micro-arc oxidation treatment cannot be performed

Method used

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  • MAX phase ceramic and composite material surface modification processing method thereof
  • MAX phase ceramic and composite material surface modification processing method thereof
  • MAX phase ceramic and composite material surface modification processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Specimen is Ti 3 AlC 2 , the surface is polished with 600~2000# water-resistant sandpaper, and then degreased and cleaned with acetone, alcohol, deionized water, etc., and dried. Then immerse the cleaned test piece in the anolyte, the solution consists of 15g / L Na 2 SiO 3 , 6g / L of NaOH, 8g / L of KF, and the balance of deionized water. Using pulse power supply, current density 20mA / cm 2 , the frequency is 600Hz, the duty cycle is 30%, the electrolytic solution has been subjected to electromagnetic stirring, the temperature is maintained at 40°C, the treatment time is 15min, and the termination voltage is 400V. Afterwards, the sample was rinsed with distilled water and dried, and the oxide film layer was mainly composed of Al 2 o 3 and TiO 2 Group and part of Al 2 TiO 5 composition.

[0034] The surface morphology of the prepared oxide film is shown in the appendix figure 1 . Depend on figure 1 It can be seen that after micro-arc oxidation, Ti 3 AlC 2 The s...

Embodiment 2

[0037] Specimen is Ti 3 (Si 0.95 al 0.05 )C 2 , the surface is polished with 600-2000# water-resistant sandpaper, and then degreased and cleaned with acetone, alcohol, deionized water, etc., and dried. Then immerse the workpiece in the anolyte, the solution consists of 30g / L Na 2 SiO 3 , 10g / L of NaOH, 20g / L of KF, and the balance of deionized water. Using pulse power supply, the current density is 35mA / cm 2 , the frequency is 800Hz, the duty cycle is 35%, the electrolytic solution has been subjected to electromagnetic stirring, the temperature is maintained at 30°C, the treatment time is 20min, and the termination voltage is 500V. Afterwards, the sample was rinsed with self-distilled water and dried, and the oxide film layer was mainly composed of TiO 2 and some Al 2 TiO 5 Composition, a small amount of Si to amorphous SiO 2 form exists. The thickness of the film layer is 4 μm, and the hardness is 9.5 GPa.

[0038] The surface morphology of the prepared oxide film...

Embodiment 3

[0041] Specimen is Ti 3 SiC 2 -2vol.% Al 2 o 3 , the surface is polished with 600~2000# sandpaper, cleaned with acetone alcohol and deionized water, and dried. Then immerse the sample in the anolyte, the solution consists of 20g / L NaAlO 2 , 4g / L of NaOH, 15g / L of KF, 3mL / L of 30wt%H 2 o 2 (Its role is to react in the solution to provide the necessary O for film formation 2 , increase the film forming speed and film thickness), and the remaining deionized water is composed of a pulse power supply with a current density of 40mA / cm 2 , the frequency is 1000Hz, the duty cycle is 30%, the electrolytic solution has been subjected to electromagnetic stirring, the temperature is maintained at 45°C, the treatment time is 60min, and the termination voltage is 600V. The samples were then rinsed with distilled water and dried. The thickness of the oxide film layer is 50 μm, the surface is uniform, and it is well combined with the substrate.

[0042] To sum up the above three embo...

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Abstract

The invention relates to the field of material surface modification processing, in particular to MAX phase ceramic and a composite material surface modification processing method thereof. A micro-arc oxidation method is adopted for generating oxide film layers on the MAX phase ceramic and a composite material surface of the MAX phase ceramic in situ, and mainly, the MAX phase ceramic with M being valve metal elements (Ti, Mg, Al, Zr, Nb, Ta and the like) and solid solutions or second-phase modified composite materials with the MAX phase ceramic being bases are processed. A micro-arc oxidation processing technology is adopted so that the composite oxide film layers which are well combined with base bodies compactly can be prepared on the surfaces of ceramic materials. The method is low in cost, simple in technology, environmentally friendly, and capable of being applied on a large scale and remarkably improving the surface hardness, the corrosion resistance, the abrasion resistance, high-temperature thermal stability and other performance of the MAX phase ceramic materials with good performance of ceramic and metal and the composite materials of the MAX phase ceramic materials.

Description

technical field [0001] The invention relates to the field of material surface modification treatment, in particular to a treatment method for surface modification of MAX phase ceramics and their composite materials, which uses a micro-arc oxidation method to generate oxide films in situ on the surface of MAX phase ceramics and their composite materials layer method. Background technique [0002] MAX phase is a general term for a class of ternary compounds with a microscopic layered structure, and its chemical formula can be expressed as M n+1 AX n , M is a transition group metal element, A is a main group element (mainly referring to IIIA and IVA group elements), X is a C or N element, and n is an integer ranging from 1 to 6. Typical MAX phases include: Ti 3 SiC 2 、Ti 3 AlC 2 、Ti 2 AlC, Cr 2 AlC et al. Due to its unique crystal structure and bonding method, MAX phase compounds have excellent properties of both metals and ceramics, such as low density, high elastic m...

Claims

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Application Information

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IPC IPC(8): C25D11/02
Inventor 李美栓李月明徐敬军钱余海李希超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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