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A Grinding Method Based on Surface Oxidation of SICP/Al Composite

A composite material, surface oxidation technology, applied in anodizing, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of difference in grinding removal rate, embedded defects, surface quality damage, etc., to improve the grinding surface quality, avoid grinding The effect of defects

Active Publication Date: 2021-04-06
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the completely different physical and mechanical properties of the SiC particle reinforcement phase and the Al alloy matrix phase, there are many problems in the grinding of SiCp / Al composite materials by traditional grinding methods, such as: 1) Due to the difference in hardness between the SiC particles and the Al alloy matrix, the grinding There is a big difference in the removal rate, and the overgrinding of the Al alloy matrix makes the SiC particles protrude too much from the surface
2) SiC particles are easy to form through cracks or break under the action of grinding pressure and abrasive particles, forming grinding defects
3) Abrasives and broken SiC particles are easy to embed into the surface layer of Al alloy matrix with low hardness, forming embedded defects
4) It is difficult to reasonably select the grinding abrasive, abrasive particle size and grinding process parameters
The existence of the above-mentioned problems not only damages the processed surface quality, but also directly affects subsequent processing and work, such as coating quality, polishing yield, workpiece performance and long-term working reliability

Method used

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  • A Grinding Method Based on Surface Oxidation of SICP/Al Composite
  • A Grinding Method Based on Surface Oxidation of SICP/Al Composite
  • A Grinding Method Based on Surface Oxidation of SICP/Al Composite

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Experimental program
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Effect test

Embodiment 1

[0028] (1) Perform conventional anodic oxidation pretreatment process on the SiCp / Al composite material sample. Mechanical polishing, alkali washing, water washing, pickling, water washing to get a clean surface. Alkali washing uses 7% NaOH solution at a temperature of 50°C, and pickling uses a 50% nitric acid solution at room temperature.

[0029] The pretreated SiCp / Al composite material sample was used as the anode, and the lead plate was used as the cathode, and anodized in an anodic oxidation solution to obtain Al on the surface. 2 o 3 SiCp / Al composite material of oxide ceramic film, the thickness of the ceramic film is 10μm, the thickness of the dense inner layer is 3μm, the porous outer layer is 7μm, and the surface hardness is 1000HV. Among them, the composition of the anodic oxidation aqueous solution is: sulfuric acid 200g / L, oxalic acid 1.5g / L, glycerin 3ml / L, and the process parameters are: voltage 15V, temperature 20°C, and treatment time 60min.

[0030]Wash a...

Embodiment 2

[0032] The conventional micro-arc oxidation pretreatment process was carried out on the SiCp / Al composite material sample. Adopt conventional micro-arc oxidation pretreatment process, grinding and polishing, ultrasonic cleaning, water washing. Grinding and polishing use 200#, 400#, 600#, 800#, 1000# sandpaper, use acetone for ultrasonic cleaning, and use deionized water for washing.

[0033] The pretreated SiCp / Al composite material sample was used as the anode, and the stainless steel was used as the cathode, and the micro-arc oxidation treatment was carried out in the micro-arc oxidation solution to obtain Al on the surface. 2 o 3 The SiCp / Al composite material of the oxide ceramic film has a film thickness of 40 μm, among which, the thickness of the dense layer is 10 μm, the loose layer is 30 μm, and the surface hardness is 2800HV. Include 10g / L Na in the micro-arc oxidation aqueous solution 2 SiO 3 , 2g / L KOH, Na 2 WO 4 2g / L, nano-SiC particles 1.5g / L, temperature 25...

Embodiment 3

[0039] The conventional anodic oxidation pretreatment process was carried out on the SiCp / Al composite material sample. Mechanical polishing, alkali washing, water washing, pickling, water washing to get a clean surface. Alkali washing uses 7% NaOH solution at a temperature of 50°C, and pickling uses a 50% nitric acid solution at room temperature.

[0040] The pretreated SiCp / Al composite material sample was used as the anode, and the lead plate was used as the cathode, and anodized in an anodic oxidation solution to obtain Al on the surface. 2 o 3 The SiCp / Al composite material of the oxide ceramic film, the thickness of the ceramic film is 50 μm, the thickness of the dense inner layer is 10 μm, the porous outer layer is 40 μm, and the surface hardness is 700HV. Among them, the composition of the anodic oxidation aqueous solution is: sulfuric acid 300g / L, oxalic acid 2g / L, glycerin 5ml / L, and the process parameters are: voltage 20V, temperature 20°C, and treatment time 120m...

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Abstract

The invention discloses a surface-oxidized SiCp / Al composite material grinding method, which belongs to the field of material machining. Realize the improvement of the grinding surface quality of SiCp / Al composite material. Specifically, the surface oxidation treatment of the SiCp / Al composite material is carried out first, mainly anodic oxidation treatment and micro-arc oxidation treatment, and Al is formed on the surface layer. 2 o 3 Oxidize the ceramic film and then grind it. The invention establishes the grinding condition of SiC particle reinforced phase and Al alloy substrate isotropic coupling removal on the grinding surface layer of SiCp / Al composite material, so as to realize the new method and process of SiCp / Al composite material precision grinding. The surface roughness is less than 0.2μm, which greatly improves the quality of the grinding surface.

Description

Technical field: [0001] The invention belongs to the technical field of material mechanical processing, and in particular relates to a grinding method of SiCp / Al composite material based on surface oxidation. Background technique: [0002] SiCp / Al composite materials have outstanding advantages such as high specific strength, specific stiffness, high specific modulus, low thermal expansion coefficient, good thermal conductivity and wear resistance, and also have incomparable designability compared to traditional alloy materials. With the development of its preparation technology With the improvement of maturity and performance, SiCp / Al composite functional components are increasingly widely used in high-tech fields such as aviation, aerospace, and electronics. The demand for precision and ultra-precision processing technology of SiCp / Al composite materials is becoming increasingly strong, especially for some parts with high surface accuracy and roughness requirements, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B1/00C25D11/06C25D11/08C25D11/10
CPCB24B1/00C25D11/026C25D11/06C25D11/08C25D11/10
Inventor 黄树涛杜春燕于晓琳
Owner SHENYANG LIGONG UNIV
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