Preparation method for forming particle and short fiber gradient structure on surface of Ti-6Al-4V alloy

A ti-6al-4v, gradient structure technology, applied in the field of surface treatment, can solve the problems of high crack sensitivity, thin surface layer, difficult to form gradient structure, etc., and achieve the effect of smooth macroscopic appearance and dense coating structure.

Inactive Publication Date: 2016-03-09
BEIJING UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a preparation method for forming a gradient structure of particles and short fibers on the surface of Ti-6Al-4V alloy, so as to solve the problems in the prior art that the treated surface has poor shape, high crack sensitivity, thin surface layer, and easy surface layer. Problems such as shedding and difficulty in forming gradient structures

Method used

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  • Preparation method for forming particle and short fiber gradient structure on surface of Ti-6Al-4V alloy
  • Preparation method for forming particle and short fiber gradient structure on surface of Ti-6Al-4V alloy
  • Preparation method for forming particle and short fiber gradient structure on surface of Ti-6Al-4V alloy

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Experimental program
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Effect test

Embodiment 1

[0026] Polish the surface of Ti-6Al-4V alloy with sandpaper, derust and degrease to obtain a smooth and smooth surface; then TiB 2 Mix mechanically with Ti powder at a mass ratio of 3:2, fully mix with 2123 phenolic resin, and blend into a uniform paste. The phenolic resin is TiB 2 and 2% of the total mass of Ti; Next, the paste is pre-coated on the surface of the Ti-6Al-4V to be processed, the thickness of the pre-layer is 0.5mm, and then placed in a drying oven for 15 hours for later use, and the drying temperature is 150°C .

[0027] Before laser processing, the preset Ti-6Al-4V alloy was preheated to 300°C in a heating furnace, and the temperature was kept stable; finally, the preset layer on the surface of Ti-6Al-4V was processed by IPG fiber laser. The laser process parameters are: laser power 2.4kW, scanning speed 5.5mm / s; spot diameter 5×5mm; argon gas flow rate 15L / min.

Embodiment 2

[0029] Polish the surface of Ti-6Al-4V alloy with sandpaper, derust and degrease to obtain a smooth and smooth surface; then TiB 2 Mix mechanically with Ti powder at a mass ratio of 3:2, fully mix with 2123 phenolic resin, and blend into a uniform paste. The phenolic resin is TiB 2 and 3% of the total mass of Ti; Next, the paste is pre-coated on the surface of the Ti-6Al-4V to be processed, the thickness of the pre-set layer is 0.6mm, and then placed in a drying oven for 20 hours for later use, and the drying temperature is 100°C .

[0030] Before laser processing, the preset Ti-6Al-4V alloy was preheated to 350°C in a heating furnace, and the temperature was kept stable; finally, an IPG fiber laser was used to process the preset layer on the surface of Ti-6Al-4V. The laser process parameters are: laser power 2.6kW, scanning speed 6.5mm / s; spot diameter 5×5mm; argon gas flow rate 10L / min.

Embodiment 3

[0032] Polish the surface of Ti-6Al-4V alloy with sandpaper, derust and degrease to obtain a smooth and smooth surface; then TiB 2 Mix mechanically with Ti powder at a mass ratio of 3:2, fully mix with 2123 phenolic resin, and blend into a uniform paste. The phenolic resin is TiB 2 and 2.5% of the total mass of Ti; next, the paste is pre-coated on the surface of Ti-6Al-4V to be processed, the thickness of the pre-set layer is 0.55mm, and then placed in a drying oven for 28 hours for later use, and the drying temperature is 125°C .

[0033] Before laser processing, the preset Ti-6Al-4V alloy was preheated to 325°C in a heating furnace, and the temperature was kept stable; finally, the Ti-6Al-4V surface preset layer was processed by an IPG fiber laser. The laser process parameters are: laser power 2.5kW, scanning speed 6mm / s; spot diameter 5×5mm; argon gas flow rate 13L / min.

[0034] Table 1: Indentation crack length of the composite coating after Example 1 under the action of...

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Abstract

The invention provides a preparation method for forming a particle and short fiber gradient structure on the surface of a Ti-6Al-4V alloy. The problems that a treated surface is poor in forming, crack sensitivity is high, a surface layer is thin and prone to falling off, and a gradient structure is hard to form are solved. The preparation method comprises the steps that firstly TiB2 powder and Ti powder are evenly mixed and pre-arranged on the surface of Ti-6Al-4V; then a sample is preheated to 300-350 DEG C, and temperature is kept stable; and finally an optical fiber laser is used for preparing a composite coating on the surface of the Ti-6Al-4V alloy. The thickness of the composite coating is above 1.5 mm, the structure is dense, no air hole or crack exists, and good metallurgical bonding of the composite coating and the Ti-6Al-4V alloy is achieved. The number of particles of the composite coating is gradually lowered from outside to inside, the number of short fibers of the composite coating is gradually increased, and the draw ratio of the short fibers can be more than 10 times. The integral comprehensive performance of materials is improved by improving the structural distribution of the surface layers of the materials, and therefore the service life of the materials is prolonged.

Description

technical field [0001] The present invention relates to the surface treatment technology for forming particle and short fiber structure on the surface of Ti-6Al-4V alloy, especially provides a preparation method for producing a thicker coating and a relatively flat macroscopic appearance on the surface of Ti-6Al-4V, and makes the coating Layers from surface to interior TiB 2 The number of particles decreased gradually, while the number of short TiB fibers increased gradually. Background technique [0002] At present, the preparation methods for forming the gradient structure of particles and short fibers on the surface of Ti-6Al-4V alloy mainly include: [0003] ①Plasma spraying [0004] Plasma spraying uses a plasma flame to melt or soften the spray powder, and relies on the power of the plasma arc flame and the external compressed air flow to push the melted particles into a sprayed particle beam, and then spray it to the surface of Ti-6Al-4V at a certain speed to form ...

Claims

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Application Information

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IPC IPC(8): C23C24/08
CPCC23C24/08
Inventor 林英华雷永平符寒光
Owner BEIJING UNIV OF TECH
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