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Method for preparing superfine titanium carbonitride

A technology of titanium carbonitride and carbon source, which is applied in the field of preparation of ultrafine titanium carbonitride, can solve the problems of complex equipment, high product quality, high cost of raw materials, difficulty in obtaining high-purity and high-quality TiCN powder, and facilitate large-scale industrial production. The effect of production, high product quality and less impurities

Active Publication Date: 2013-06-05
长沙伟徽高科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing method for preparing TiCN powder is a one-stage reaction, and the cost of raw materials is high, the equipment is complicated or the product quality is low, and it is difficult to obtain high-quality TiCN powder with high purity, small particle size and uniform particle size distribution.

Method used

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  • Method for preparing superfine titanium carbonitride
  • Method for preparing superfine titanium carbonitride
  • Method for preparing superfine titanium carbonitride

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing ultra-fine titanium carbonitride, using TiO 2 and starch as raw material, 100kg TiO 2 Mix evenly with 87.5kg starch (in which nano TiO 2 The mass ratio of carbon contained in the organic carbon source is 10:3.85), cold pressed into blocks, put into a vacuum furnace, heat up rapidly at a speed of 5°C / min, and vacuumize at the same time to make the vacuum degree less than 50Pa, when After the temperature rises to 700°C, keep it warm for 1 hour, then continue to rise to 1500°C, keep it warm for 2 hours, then stop vacuuming, feed nitrogen continuously to make the pressure in the furnace 1.1 atmospheres, and stop heating after nitriding at 1500°C for 2 hours , so that the product is cooled with the furnace. The TiCN content of the product is 99.2%, the O content is 0.9%, the Fischer particle size is 0.93um, the SEM appearance is spherical, and the particle size distribution is uniform. See figure 1 , figure 2 . image 3 with Figure 4 It is the ...

Embodiment 2

[0030] A method for preparing ultra-fine titanium carbonitride, using TiO 2 and polyvinyl alcohol as raw material, 100kg TiO 2 Mix evenly with polyvinyl alcohol containing 76.8kg (including nano-TiO 2 The mass ratio of carbon contained in the organic carbon source is 10:4), cold pressed into a block, put into a vacuum furnace, heat up rapidly at a speed of 5°C / min, and vacuumize at the same time to make the vacuum degree less than 50Pa, when After the temperature rises to 650°C, keep it warm for 1 hour, and then continue to rise to 1520°C, keep it warm for 2 hours, then stop vacuuming, and continuously feed nitrogen to make the pressure in the furnace 1.1 atmospheres. After nitriding at 1520°C for 3 hours, stop heating. Allow the product to cool in the furnace. The TiCN content of the product is 99.1%, the O content is 0.8%, and the Fibonacci particle size is 0.96um.

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Abstract

The invention belongs to the field of metal ceramic material preparation, and provides a method for preparing superfine titanium carbonitride. The method comprises the following steps of: firstly, ball-milling and mixing nano TiO2 with an organic carbon source, and preparing into a piece material in a cold pressing mode; feeding the piece material into a vacuum sensing furnace, vacuumizing till the pressure inside the furnace is less than or equal to 50Pa, increasing the temperature to 300-800 DEG C and preserving the temperature for 0.5-2h; subsequently increasing the temperature to be 1000-1900 DEG C and preserving the temperature for 0.5-2h, wherein vacuumizing is constantly performed in the temperature preservation process; stopping vacuumizing after the temperature preservation is accomplished, introducing nitrogen so as to make the pressure in the furnace be of 1.1-1.2 atmosphere pressures; preserving the temperature for 1-4h to sufficiently nitridize the raw material; and subsequently decreasing the temperature, taking out the piece material, crushing, ball-milling and grading so as to obtain the superfine titanium carbonitride of which the Fisher particle size is less than 1mm. A TiCN powder material prepared by using the method is high in purity, few in impurities, small in particle size, uniform in particle size distribution and spherical in morphology, and can be used as a raw material of a cutting tool, a metal ceramic, a spraying material and the like.

Description

technical field [0001] The invention belongs to the field of cermet materials and relates to a method for preparing ultrafine titanium carbonitride. Background technique [0002] In recent years, Ti(C,N)-based cermets have attracted more and more attention due to their good wear resistance, high hot hardness, better oxidation resistance and high temperature creep resistance. In addition, the main raw materials for making traditional hard alloys are WC and Co, which are scarce strategic resources, while the main raw materials for Ti (C, N)-based cermet tool materials are Ti, and the reserves of Ti on the earth are W 70 times that of 131, so it has great cost and resource advantages compared with traditional cemented carbide. However, the strength and toughness of Ti(C,N)-based cermets are lower than those of traditional WC—Co-based cemented carbides, which severely limits the application of cermets. If we can improve its strength and toughness without reducing the excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/626
Inventor 郭伟王家良周怡
Owner 长沙伟徽高科技新材料有限公司
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