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Method for preparing zirconium boride powder with rod-like morphology

A technology of zirconium boride and powder, which is applied in the field of powder preparation, can solve the problems of poor oxidation resistance and limited application of carbides and nitrides, and achieve the effects of cheap raw materials, strong practicability, and low oxygen content

Active Publication Date: 2014-06-11
中科西卡思(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These transition metal carbides, nitrides, and rod-shaped particle powders of carbonitrides have high strength and hardness, and have been widely used as cutting and wear-resistant materials; however, the oxidation resistance of carbides and nitrides is relatively low. Poor, which limits its application in high temperature field

Method used

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  • Method for preparing zirconium boride powder with rod-like morphology
  • Method for preparing zirconium boride powder with rod-like morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Zirconia (99% purity, 0.3μm average particle size), boron carbide (96% purity, 1.5μm average particle size), graphite (99% purity, 1.5μm average particle size) as raw materials , based on borothermic / carbothermic reduction reaction, weighed 24.645g zirconia, 5.525g boron carbide, 3.6g graphite, using absolute ethanol as ball milling medium, Si 3 N 4 The ball is a grinding ball, and the ratio of ball to material is 2:1. After 24 hours of ball milling, the slurry is rotated and evaporated at 40°C to obtain a uniformly mixed powder; at 50kg / cm 2 The uniformly mixed powder is pressed into a green body under a certain pressure; heat treatment is carried out under an argon atmosphere: the heating rate is 10°C / min, the heat treatment temperature is 1600°C, and the temperature is kept for 2 hours.

[0027] figure 1 For the XRD spectrum of the obtained zirconium boride powder, figure 2 For the SEM photo of the obtained zirconium boride powder, combined with figure 1 and f...

Embodiment 2

[0029] The difference between this example and Example 1 is that the formula of the mixed powder is "24.645g of zirconium dioxide, 2.763g of boron carbide, and 6g of graphite".

[0030] The rest of the content is exactly the same as described in Example 1.

[0031] After detection and analysis, it is known that the main component of the obtained powder is ZrB 2 , low oxygen content, the average particle size is 1.6 μm, the aspect ratio of rod-shaped particles is 3-7, and the content of rod-shaped particles is greater than 90wt%.

[0032] Comparing this example with Example 1 can further illustrate: under the same pressing pressure of the green body, the proportion of the mixed powder has little effect on the rod shape.

Embodiment 3

[0034] The formula of the mixed powder is "24.645g of zirconium dioxide, 8.288g of boron carbide, and 0.6g of graphite".

[0035] The rest of the content is exactly the same as described in Example 1.

[0036] After detection and analysis, it is known that the main component of the obtained powder is ZrB 2 , low oxygen content, the average particle size is 1.5 μm, the aspect ratio of rod-shaped particles is 3-7, and the content of rod-shaped particles is greater than 90wt%.

[0037] Comparing this example with Example 1 can further illustrate: under the same pressing pressure of the green body, the proportion of the mixed powder has little effect on the rod shape.

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Abstract

A disclosed method for preparing a zirconium boride powder with rod-like morphology comprises: based on the boron-thermal / carbon-thermal reduction reaction, taking zirconium dioxide, boron carbide and graphite as raw materials, so as to prepare a mixed powder; employing a pressure of 20-100 Kg / cm<2>, compacting the uniformly mixed powder into a blank body; and performing heat treatment on the blank body with the vacuum degree lower than 10 Pa or in the inert atmosphere. By controlling the blank body forming pressure, under the condition that no auxiliary agents are added, the method employs the boron-thermal / carbon-thermal reduction reaction, and helps to realize preferential growth of crystal grains in a specific direction and to synthesize the ZrB2 high-purity powder with the rod-like morphology; also in the prepared powder, the content of ZrB2 particles with the rod-like morphology is larger than 90 wt%, the length-diameter ratio of the rod-like particles is 3-15, the average particle size is 1.5-10 mu m, the purity is high, and the oxygen content is low; and the preparation technology is simple and strong in controllability, no special equipment is needed, and large-scale production is easily realized.

Description

technical field [0001] The invention relates to a method for preparing zirconium boride powder with a rod shape, in particular, a method for preparing zirconium boride powder with a rod shape by a boron thermal / carbothermal reduction method, which belongs to powder preparation technology field. Background technique [0002] Zirconium boride (ZrB 2 ) and its ceramic materials have excellent physical and chemical properties, such as high melting point (3245°C), high hardness (23GPa), relatively low density (6.12g / cm 3 ), good thermal conductivity, electrical conductivity, high stability and corrosion resistance, and neutron control capabilities, so it has broad application prospects in ultra-high temperature materials, wear-resistant coatings, high temperature resistance, neutron absorbers, etc. , is a very promising high-temperature structural ceramic material. [0003] About ZrB 2 The synthesis and research of powders began in the early 20th century, and the preparation ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/626
Inventor 张国军邱慧瑜阚艳梅邹冀郭伟明
Owner 中科西卡思(苏州)科技发展有限公司
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