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A method for preparing a carbon nanotube reinforced composite ceramic layer on the surface of a titanium-nickel alloy

A technology of carbon nanotubes and enhanced compounding, which is applied in the direction of plating of superimposed layers, metal material coating process, coating, etc., can solve the problems of insufficient hardness of titanium dioxide layer, poor coordinated deformation ability, large internal stress, etc., and achieve improvement Abrasion resistance and biocompatibility, low cost, and improved hardness

Active Publication Date: 2017-06-06
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems to be solved in the current application of titanium dioxide layer: ① The structure and performance of the titanium dioxide layer are quite different from the matrix, there is a large internal stress, and the ability to coordinate deformation is poor; Cracks and spalling failures are prone to occur under the action of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step 1. Using graphite as the source electrode, the surface of the titanium-nickel base material is carburized by double-layer glow plasma metallization technology to obtain a titanium carbide modified layer.

[0015] Clean the surface of the workpiece: grind the titanium-nickel alloy with a nickel atomic percentage of 50.8% to 2000# step by step with water sandpaper, then polish it, and then ultrasonically clean it with deionized water, acetone and absolute ethanol for 15 to 30 minutes. Airtight and dry at room temperature.

[0016] Furnace loading: Put the treated titanium-nickel alloy into a double-layer glow plasma metal infiltration furnace, use graphite as the source target material, the electrode spacing is 18-19mm, and the sputtering gas is high-purity argon.

[0017] Vacuuming and pre-sputtering: Turn on the mechanical pump, evacuate to below 5Pa, pass in argon gas, the pressure is 35Pa; turn on the cathode power supply, the cathode voltage is 500V, pre-sputter...

Embodiment 2

[0028] Step 1 and Step 2 of this embodiment are exactly the same as Embodiment 1.

[0029] Step 3. Using the titanium carbide / titanium gradient modified layer obtained in step 2 as an anode, a carbon nanotube-reinforced composite ceramic layer is prepared in a micro-arc oxidation electrolyte containing carbon nanotubes by using a micro-arc oxidation technique.

[0030] The purification method of multi-walled carbon nanotubes is as follows: place carbon nanotubes in a mixed acid with a volume ratio of sulfuric acid and nitric acid of 3:1, heat at 100°C for 2 hours, filter and rinse with ionized water to make the pH to neutral, and bake Dry.

[0031] Preparation method of multi-walled carbon nanotube dispersant: the dispersant is composed of cetyltrimethylammonium bromide solution in an aqueous solution of ethylene glycol with a volume ratio of 1:1, and the content of cetyltrimethylammonium bromide 1 g / L.

[0032] At room temperature, immerse the purified multi-walled carbon n...

Embodiment 3

[0034]Step 3. Using the titanium carbide / titanium gradient modified layer obtained in step 2 as an anode, a carbon nanotube-reinforced composite ceramic layer is prepared in a micro-arc oxidation electrolyte containing carbon nanotubes by using a micro-arc oxidation technique.

[0035] The purification method of multi-walled carbon nanotubes is as follows: place carbon nanotubes in a mixed acid with a volume ratio of sulfuric acid and nitric acid of 3:1, heat at 100°C for 2 hours, filter and rinse with ionized water to make the pH to neutral, and bake Dry.

[0036] Preparation method of multi-walled carbon nanotube dispersant: the dispersant is composed of cetyltrimethylammonium bromide solution in an aqueous solution of ethylene glycol with a volume ratio of 1:1, and the content of cetyltrimethylammonium bromide 1 g / L.

[0037] At room temperature, immerse the purified multi-walled carbon nanotubes in a dispersant and disperse ultrasonically for 45 minutes to obtain a stable...

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Abstract

The invention belongs to the technical field of metal material surface modification, and particularly relates to a method of preparing a carbon nano tube reinforced composite ceramic layer on the surface of a titanium-nickel alloy. The method of preparing the carbon nano tube reinforced composite ceramic layer on the surface of the titanium-nickel alloy comprises the steps that the surface of the titanium-nickel alloy is carburized by adopting a double glow discharge plasma surface alloying technique to form a titanium carbide modification layer; the surface of the titanium-nickel alloy is carburized by adopting the double glow discharge plasma surface alloying technique to form a titanium carbide / titanium gradient modification layer; and by taking the titanium carbide / titanium gradient modification layer as an anode, adopting a micro-arc oxidation technique, and adding a carbon nano tube to a micro-arc oxidation electrolyte, the carbon nano tube reinforced composite ceramic layer is obtained. The bonding strength of the carbon nano tube reinforced composite ceramic layer to a matrix is high, and the hardness, the abrasive resistance, the corrosion resistance and the biocompatibility of the modification layers are improved effectively.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and in particular relates to a method for preparing a carbon nanotube-reinforced composite ceramic layer on the surface of a titanium-nickel alloy. Background technique [0002] Titanium-nickel alloy has excellent intelligent properties such as shape memory effect and superelasticity, and has important application value in the fields of biomedicine, aerospace and mechanical engineering. However, there are two problems with titanium-nickel alloys. One is that when used in machinery and construction, due to its low hardness, the wear resistance needs to be improved; the other is that titanium-nickel alloys contain more nickel elements. When used as biological materials, The precipitation of nickel ions will cause harm to the human body and reduce its biocompatibility. Therefore, how to modify the surface of titanium-nickel alloy to improve its tribological propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C23C12/00C25D11/26C25D15/00
Inventor 王振霞吴海瑞单小林林乃明刘小萍贺志勇
Owner TAIYUAN UNIV OF TECH
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