Method for preparing carbonized titanium powder by vacuum carbothermal reduction

A technology of titanium carbide powder and carbon heat, which is applied in the field of vacuum carbon thermal reduction to prepare titanium carbide powder, can solve the problems of difficult temperature control, difficulty in obtaining fine powder, and limitation of carbon source distribution, so as to achieve the effect of saving energy and not being easily oxidized

Inactive Publication Date: 2010-06-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial titanium carbide powder is originally carbon black reduced TiO 2 Synthesized, the reaction temperature is 1700 ° C ~ 2100 ° C, the time is 10 ~ 24 h, and the gas protection atmosphere is carried out in a tube furnace or an electric arc furnace. Due to uneven mixing of materials, the carbon source is in TiO 2 The distribution in the medium is limited, the material is affected by the diffusion gradient during the reaction, and there is unreacted TiO after the reaction 2 and carbon, often making the synthetic p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1: 100-200 mesh titanium dioxide and activated carbon are weighed and mixed according to a mass ratio of 20:9. The titanium dioxide contains TiO 2 ≥98.5wt%, add the planetary ball mill to ball mill for 8 hours, the speed of the ball mill is 400rpm, the ball milled material is made into a block of Ф2cm×1.5-2.5cm in the tablet press, and the block is put into the vacuum furnace for 15 Heating rate of ℃ / min to 1500℃, heat preservation for 5 hours, so that the material undergoes vacuum carbothermal reduction reaction, during which the vacuum furnace pressure is maintained at 10Pa~100Pa, the material after the vacuum carbothermal reduction reaction is broken, and the particle size is less than 1μm. Titanium carbide powder.

Example Embodiment

[0016] Example 2: 100-200 mesh titanium dioxide and carbon black are weighed and mixed according to a mass ratio of 20:12. The titanium dioxide contains TiO 2 It is 99wt%, added to the planetary ball mill for 20 hours, the ball mill speed is 200rpm, the ball milled material is made into a block of Ф2×2-3cm in the tablet press, and the block is put into the vacuum furnace at 12℃ / min The heating rate is heated to 1300℃ and kept for 8 hours to cause the material to undergo a vacuum carbothermal reduction reaction. During this period, the vacuum furnace pressure is maintained at 50Pa-100Pa, and the material after the vacuum carbothermal reduction reaction is crushed to prepare titanium carbide powder with a particle size of <1μm .

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Abstract

The invention relates to a method for preparing carbonized titanium powder by vacuum carbothermal reduction. A method of vacuum metallurgy is adopted, and the method comprises the following steps: taking titanium dioxide and carbon as raw materials, wherein the mass ratio of the titanium dioxide to the carbon powder is 20:9-21; after crushing and briquetting, entering a vacuum furnace; heating the materials to the temperature of between 1,300 and 1,600 DEG C at a heating rate of 10-15 DEG C per minute; and keeping the temperature for 2 to 10 hours, and controlling the pressure in the furnace to between 10 and 100 Pa. Therefore, the materials undergo vacuum carbothermal reduction reaction, and ultra-fine carbonized titanium powder is prepared.

Description

1. Technical field [0001] The invention relates to a method for preparing titanium carbide powder by vacuum carbothermal reduction, which belongs to the technical field of vacuum metallurgy. 2. Background technology [0002] Titanium carbide contains 20.05% carbon and is a gray powder with a NaCl type cubic crystal structure. The density is 4.93 g / cm 3 Melting point: 3160°C, boiling point: 4300°C; with high melting point, high strength, high hardness and high elastic modulus, good thermal shock resistance and chemical stability, high temperature oxidation resistance is only lower than silicon carbide, is a cemented carbide Therefore, it is widely used as a hard phase in structural materials to make wear-resistant materials, cutting tool materials, mold manufacturing, mechanical parts, etc. It can also be used to make crucibles for melting tin, lead, cadmium, zinc and other metals. Transparent titanium carbide ceramics are excellent optical materials; the excellent thermal s...

Claims

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Application Information

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IPC IPC(8): C01B31/30
Inventor 徐宝强杨斌森维戴永年刘大春宋健勋郁青春秦博邓勇曲涛熊恒王飞李一夫蒋文龙
Owner KUNMING UNIV OF SCI & TECH
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