Surface modification method for titanium carbide particles

A surface modification and particle surface technology, applied in the field of materials, can solve the problems such as the surface composition and morphology of the reconstructed particles that are not involved in the surface modification of titanium carbide particles, and achieve good ion diffusion conditions for reactants, smooth surfaces, and spherical coefficients. high effect

Active Publication Date: 2019-10-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] It can be seen that none of the existing inventions involves the method of using an alkali metal chloride molten salt bath to modify the surface of titanium carbide particles and reconstruct the composition and morphology of the particle surface. The present invention has originality

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  • Surface modification method for titanium carbide particles

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Experimental program
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Effect test

example 1

[0028] The spherical coefficient of a commercial titanium carbide particle is about 67%. With sodium chloride as molten salt, (m Ti +m TiC +m TC +m c ):m s =1:2.4. Among them, m Ti 、m TiC 、m TC 、m c 、m s are the mass of metallic titanium, titanium carbide, titanium dichloride, solid carbon 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 reaches the predetermined temperature, it is kept at 1191℃-1198℃ for 3 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 ...

example 2

[0030] The spherical coefficient of a commercial titanium carbide particle is about 71%, and the particle size is uneven. With calcium chloride as molten salt, (m Ti +m TiC +m TC +m c ):m s =1:2.9. Among them, m Ti 、m TiC 、m TC 、m c 、m s are the mass of metallic titanium, titanium carbide, titanium dichloride, solid carbon 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, it is kept 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 ...

example 3

[0032] The spherical coefficient of a commercial titanium carbide particle is about 82%, and the particle size is uneven. With calcium chloride as molten salt, (m Ti +m TiC +m TC +m c ):m s =1:3.5. Among them, m Ti 、m TiC 、m TC 、m c 、m s are the mass of metallic titanium, titanium carbide, titanium dichloride, solid carbon 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 concentr...

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Abstract

The invention belongs to the field of smelting, and specifically relates to a surface modification method for titanium carbide particles. The surface modification method comprises the following steps:mixing the titanium carbide particles with alkali metal chloride, metal titanium, sodium fluoride, titanium dichloride and graphite powder, and placing an obtained mixture into alkali metal chloridemolten salt at 1101 DEG C to 1199 DEG C. According to the invention, by utilization of the disproportionation-comproportionation characteristic of a titanium element, and with the metal titanium and the graphite powder as raw materials, the surface of the titanium carbide particles is modified, and the sintering performance of the titanium carbide powder is improved through improvement of a spherical coefficient. The modification reaction of titanium carbide provided by the invention is performed in a molten salt bath; the diffusion conditions of reactant ions are good; the surface propertiesof the titanium carbide are improved; and a product namely the titanium carbide has smooth surface and high spherical coefficient.

Description

technical field [0001] The invention belongs to the field of materials and relates to a method for surface modification of titanium carbide particles. [0002] technical background [0003] Titanium carbide has many excellent properties such as high temperature resistance, high strength, corrosion resistance, and high thermal conductivity, and is widely used in many fields such as cermets, cutting tool materials, wear-resistant refractory materials, and heat-resistant alloys. The particle property of titanium carbide is an important factor affecting its sintering performance. Common titanium carbide production methods include: carbothermal reduction method, direct carbonization method, chemical vapor deposition method, and high-temperature self-propagating synthesis method. For titanium carbide particles, the diffusion conditions of these methods are not good, the quality of the product titanium carbide is not high, and the application performance is limited. [0004] Chine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCC01G23/08C01P2004/32
Inventor 胡文韬焦树强刘欣伟
Owner UNIV OF SCI & TECH BEIJING
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