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Method for preparing titanium carbide ceramic powder

A ceramic powder and titanium carbide technology, which is applied in the field of preparing nano-titanium carbide ceramic powder, can solve the problems of uneven mixing, high reaction temperature, and long reaction time, and achieve the effects of uniform mixing, lower reaction temperature, and prevention of agglomeration

Inactive Publication Date: 2009-06-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to increase the uniformity of raw material mixing, and at the same time, two kinds of submicron particles with smaller particle size can be directly contacted and reacted to improve the reaction activity, and synthesize high-purity and fine-grained ceramic powder under lower reaction temperature conditions; When the thermal reduction method directly uses oxide ceramic powder and carbon powder as raw materials, the problems of uneven mixing, high reaction temperature and long reaction time

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 0.1 mol of titanium tetrachloride, 0.1 mol of glucose, 0.2 mol of nitric acid, and 0.1 mol of urea. The above-mentioned substances were dissolved in 100ml of distilled water to prepare a solution, and the solution was heated on a temperature-controllable electric furnace at 300°C. After a series of processes such as volatilization, concentration, and bubbling, the solution underwent a combustion reaction to obtain a precursor. The precursor was pulverized and treated in air at 400° C. for 1 hour. The resulting material was reacted for 1 hour under the conditions of 1400° C. and an argon gas flow rate of 3 l / min, and the reaction product was processed to obtain titanium carbide powder.

Embodiment 2

[0020] Weigh 0.09 mol of titanium tetrachloride, 0.06 mol of citric acid, 1.5 mol of nitric acid, and 0.5 mol of urea. Dissolve the above-mentioned substances in 100ml of distilled water to prepare a solution, and heat the solution on a temperature-controllable electric furnace at 200°C. After the solution undergoes a series of processes such as volatilization, concentration, and bubbling, a combustion reaction occurs to obtain a precursor . The precursor was pulverized and treated in air at 200° C. for 2 hours. The obtained material was reacted for 10 hours at 1200° C. and the flow rate of argon gas was 1 l / min, and the reaction product was subjected to subsequent treatment to obtain titanium carbide powder.

Embodiment 3

[0022] Weigh 0.09 mol of titanium tetrachloride, 0.06 mol of sucrose, 5 mol of nitric acid, and 0.5 mol of urea. Dissolve the above-mentioned substances in 100ml of distilled water to prepare a solution, and heat the solution on a temperature-controllable electric furnace at 400°C. After a series of processes such as volatilization, concentration, and bubbling, the solution undergoes a combustion reaction to obtain a precursor . The precursor was pulverized and treated in air at 600° C. for 1 hour. The resulting material was reacted for 8 hours under the conditions of 1600° C. and an argon flow rate of 5 l / min, and the reaction product was processed to obtain titanium carbide powder.

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Abstract

The invention provides a method for preparing titanium carbide ceramic powder, which belongs to the field of preparing ceramic powder. A titanium source comprises soluble titanium salt titanium tetrachloride or titanium tetrabromide; a carbon source comprises glucose, sucrose, citric acid and soluble starch; oxidant is nitric acid; fuel is urea; ammonium nitrate is a blending agent; the molar ratio of the titanium source to the carbon source is 1: (4-16); and the mixture ratio of the nitric acid to the urea to the ammonium nitrate according to (n nitric acid+n ammonium nitrate) / (2n urea+n ammonium nitrate) is (1-12):2. The method comprises the steps of dissolving various raw materials in water, heating the raw materials at a temperature between 100 and 600 DEG C, obtaining a precursor after the combustion reaction of a solution, grinding the precursor, pretreating the precursor for 0 to 10 hours at a temperature between 200 and 800 DEG C, subjecting the precursor to carbothermal reduction for 1 to 10 hours in flowing argon atmosphere at a temperature between 800 and 1,800 DEG C, subjecting products to subsequent treatment and obtaining titanium carbide powder. As the titanium source and the carbon source in the precursor are small in particle size, uniform in mixture and good in reaction activity, the method has the advantages of lowering the reaction temperature of carbothermal reduction and improving reaction rate, and can prepare the nanometer non-oxide ceramic powder with good dispersion property.

Description

technical field [0001] The invention belongs to the technical field of ceramic powder preparation, and in particular provides a method for preparing nanometer titanium carbide ceramic powder. Background technique [0002] Titanium carbide has a high melting point, high hardness and high elastic modulus, good thermal shock resistance and chemical stability, high temperature oxidation resistance is only lower than silicon carbide, titanium carbide is an important raw material for cemented carbide, so it is used in structural materials As a hard phase, it is widely used to make wear-resistant materials, cutting tool materials, 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. Titanium carbide's excellent thermal shock resistance makes it suitable for use as a special refractory material in neutral or reducing atmospheres. [0003] High-qualit...

Claims

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Application Information

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IPC IPC(8): C01B31/30C04B35/56
Inventor 曲选辉秦明礼王建欧阳明亮张玲艳贾宝瑞
Owner UNIV OF SCI & TECH BEIJING
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