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A kind of titanium powder surface modification method

A technology of surface modification and titanium powder, which is applied in the field of materials to achieve the effect of high spherical coefficient, good diffusion conditions of reactant ions and smooth surface

Active Publication Date: 2020-12-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention proposes a method for modifying the shape and surface morphology of titanium powder, which has strong originality. At present, there are few technologies at home and abroad that can achieve similar effects

Method used

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  • A kind of titanium powder surface modification method

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Effect test

example 1

[0028] The spherical coefficient of a commodity titanium powder is about 67%. With sodium chloride as molten salt, (m Ti +m TC +m TiF ):m s = 1: 2.4. Among them, m Ti 、m TC 、m TiF 、m s are the mass of titanium block, titanium dichloride, titanium powder and molten salt in the molten salt, respectively. The temperature rise rate from room temperature to 575°C is between 5.51°C / min and 5.56°C / min, the temperature rise rate between 575°C and 998°C is between 3.96°C / min and 3.99°C / min, and the temperature rise rate between 999°C and 1198°C The heating rate between ℃ is between 2.88℃ / min and 2.91℃ / min; after the temperature rises to the predetermined temperature, it is kept at 1191℃-1198℃ for 3h. At high temperature, the porous plate and the sieve plate with a pore diameter of 0.21 mm to 1.99 mm are used for two-stage filtration, and then the residual titanium metal block and the modified titanium powder are separated respectively. The filtered liquid molten salt and meta...

example 2

[0030] The spherical coefficient of a commercial titanium powder is about 71%, and the particle size is uneven. With calcium chloride as molten salt, (m Ti +m TC ): m s =1:2.9. Among them, m Ti 、m TC 、m TiF 、m sare the mass of titanium block, titanium dichloride, titanium powder and molten salt in the molten salt, respectively. The temperature rise rate from room temperature to 575°C is between 5.51°C / min and 5.56°C / min, the temperature rise rate between 575°C and 998°C is between 3.96°C / min and 3.99°C / min, and the temperature rise rate between 999°C and 1198°C The heating rate between ℃ is between 2.88 ℃ / min and 2.91 ℃ / min, and after reaching the predetermined temperature, keep it at 1161 ℃ -1168 ℃ for 5 hours. Use a porous plate at high temperature to filter out most of the liquid molten salt from the solid product; after the molten salt is cooled, remove the solid product and add water to adjust the slurry concentration to 51% to 52%, and use eddy current separation...

example 3

[0032] The spherical coefficient of a commercial titanium powder is about 82%, and the particle size is uneven. With calcium chloride as molten salt, (m Ti +m TC +m TiF ):m s =1:3.5. Among them, m Ti 、m TC 、m TiF 、m s are the mass of titanium block, titanium dichloride, titanium powder and molten salt in the molten salt, respectively. The temperature rise rate from room temperature to 575°C is between 5.22°C / min and 5.23°C / min, the temperature rise rate between 575°C and 998°C is between 3.83°C / min and 3.84°C / min, and the temperature rise rate between 999°C and 1198°C The heating rate between °C is between 2.66 °C / min and 2.68 °C / min, and after reaching the predetermined temperature, keep it at 1196 °C-1197 °C for 4 hours. Use a porous plate at high temperature to filter out most of the liquid molten salt from the solid product; after the molten salt is cooled, remove the solid product and add water to adjust the slurry concentration to 55% to 56%, and use eddy curren...

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Abstract

The invention belongs to the field of smelting, and particularly relates to a method for modifying the surface of titanium powder. First, titanium powder is mixed with alkali metal (alkaline earth metal) chloride, metal titanium, sodium fluoride and titanium dichloride, and placed in alkali metal (alkaline earth metal) chloride molten salt at 1099-1198°C. Then use the strong solubility of molten salt to dissolve titanium dichloride, use titanium ions as the medium and metal titanium blocks as raw materials, and promote the deposition of titanium metal on the surface of titanium powder with the help of the disproportionation-neutralization characteristics of titanium element, so as to modify the titanium powder Surface, increase the spherical coefficient to improve the 3D printing performance and sintering performance of titanium powder. After the reaction is completed, the porous plate and the sieve plate with a pore diameter of 0.21 mm to 1.99 mm are used for two-stage filtration, and then the residual metal titanium block and the modified titanium powder are respectively separated. The entire modification process of the present invention is carried out spontaneously, the titanium atoms are transferred from the surface of the metal titanium block and deposited onto the surface of the titanium powder, and the key process can be controlled by means of parameters. The modification reaction of titanium powder is carried out in a molten salt bath, the ion diffusion conditions of the reactants are good, the surface of the product titanium powder is smooth, and the spherical coefficient is high.

Description

technical field [0001] The invention belongs to the field of materials and relates to a method for modifying the surface of titanium powder. [0002] technical background [0003] Chinese invention patent CN108676452A discloses a modification method of anti-deliquescence coarse titanium powder. The coarse titanium powder is placed in a mixing device, and tap water is added to the material, and the material is stirred into a paste by the mixing device, and the paste-like material is Pour into the forming mold, and transfer the mold to the drying equipment, make the pasty material agglomerate in the mold, then take out the material and cool it, put the material vinylpyrrolidone vinyl acetate copolymer, hypromellose, poly Put ethylene glycol 6000, iron oxide, titanium dioxide and talcum powder into a high-speed mixer for mixing, then pour Tween 80 evenly onto the materials in the high-speed mixer, and mix to make an anti-deliquescence preparation. Add water to the anti-deliques...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
CPCB22F1/065B22F1/17
Inventor 胡文韬焦树强刘欣伟
Owner UNIV OF SCI & TECH BEIJING