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Preparation method of zirconium carbide ceramic powder

A ceramic powder, zirconium carbide technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high reaction temperature, long reaction time, uneven mixing, etc., and achieves simple production process, low production cost, well-mixed effect

Active Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for preparing zirconium carbide ceramic powder by carbothermal reduction method, which solves the problem of directly using zircon sand (ZrSiO2) in traditional carbothermal reduction method. 4 ) or baddeleyite (ZrO 2 ) Problems such as uneven mixing, high reaction temperature, long reaction time, and high cost caused by ceramic powder and carbon black as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 0.1 mol of glucose, 0.1 mol of zirconium nitrate, 0.1 mol of urea, and 0.02 mol of ammonium nitrate. The various water-soluble raw materials mentioned above are dissolved in deionized water to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 300°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. The precursor was pulverized and treated in air at 500°C for 5 hours. The resulting substance was reacted for 8 hours at 1400° C. with an argon flow rate of 3 l / min to obtain a reaction product. The reaction product is subsequently processed to obtain zirconium carbide powder.

Embodiment 2

[0018] Weigh 0.2 mol of glucose, 0.1 mol of zirconium oxychloride, 0.1 mol of urea, 0.2 mol of nitric acid, and 0.02 mol of ammonium nitrate. The various water-soluble raw materials mentioned above are dissolved in deionized water to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 400°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. The precursor was pulverized and treated in air at 600°C for 2h. The obtained substance was reacted for 5 hours under the conditions of 1500° C. and an argon flow rate of 3 l / min to obtain a reaction product. The reaction product is subsequently processed to obtain zirconium carbide powder.

Embodiment 3

[0020] Weigh 0.3 mol of glucose, 0.1 mol of zirconium nitrate, 0.1 mol of urea, and 0.05 mol of ammonium nitrate. The various water-soluble raw materials mentioned above are dissolved in deionized water to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 300°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. The precursor was pulverized and treated in air at 700°C for 0.5h. The obtained substance was reacted for 8 hours under the conditions of 1500° C. and an argon flow rate of 3 l / min to obtain a reaction product. The reaction product is subsequently processed to obtain zirconium carbide powder.

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Abstract

A preparation method of zirconium carbide ceramic powder belongs to the preparation field of ceramic powder. By improving a raw material mixing method and enabling subparticles with smaller particle size to be directly contacted and reacted, reaction activity of precursors is improved, thereby helping to enable the precursors to be compounded to high-purity fine-grained ceramic powder at a low temperature. A zirconium source is zirconium nitrate or zirconium oxychloride, a carbon source is glucose, and additives are carbamide, ammonium nitrate and hydrogen nitrate. Molar ratio of the zirconium source to the carbon source (Zr: C) is 1: 5-18. Molar ratio of +5 valence of nitrogen and -3 valence of nitrogen is N +5: N-3 = 1: 0.1-10. The particle size of the zirconium source and the carbon source in the precursors is small, mixing is even, reaction activity is good, carbothermic reduction reaction temperature can be lowered, reaction rate can be improved, and nano-level zirconium carbide ceramic powder with good dispersibility can be prepared. In addition, a variety of raw material sources are available, price is low, production cost is low, and prepared zirconium carbide nano-powder is stable in property, simple in production process and capable of achieving mass production.

Description

technical field [0001] The invention belongs to the technical field of ceramic powder preparation, and in particular provides a method for preparing nano-scale zirconium carbide ceramic powder. Background technique [0002] Zirconium carbide (ZrC) is a refractory metal carbide with excellent thermal conductivity and electrical conductivity, and the electrical conductivity is equivalent to that of metal. ZrC has good radiation resistance and is a good alternative to the traditional SiC coating for coating fuel particles. In addition, ZrC is also suitable for many fields such as emitter shell coating, nuclear fuel particle coating, thermal photoelectric radiator coating and ultra-high temperature materials. [0003] High-quality powder raw materials are a prerequisite for obtaining high-performance products. To prepare ZrC ceramic materials with excellent performance, it is first necessary to prepare ZrC powder with high purity, fine particle size, and good sintering performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30C04B35/56C04B35/626C01B32/914
Inventor 曲选辉秦明礼储爱民贾宝瑞鲁慧峰
Owner UNIV OF SCI & TECH BEIJING
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