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High-purity hafnium diboride micro-powder combustion synthesis method

A hafnium diboride, combustion synthesis technology, applied in chemical instruments and methods, boron/boride, metal boride, etc., can solve the problems of high raw material cost, high process cost, long production cycle, etc., and achieve high production efficiency , broad application prospects and low cost

Inactive Publication Date: 2008-01-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high raw material cost, high energy consumption, long production cycle and high process cost in the existing hafnium diboride micropowder preparation method, the present invention further provides a high-purity hafnium diboride micropowder combustion synthesis method

Method used

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specific Embodiment approach 1

[0026] Specific embodiment one: the method of this embodiment is realized according to the following steps: 1. Basic raw material and diluent are carried out batching, and basic raw material comprises hafnium dioxide, boric anhydride and magnesium powder, is by weight percentage: hafnium dioxide: 30% to 60%, boric anhydride: 10% to 40%, magnesium powder: 15% to 50%, and the weight of the diluent hafnium diboride added is 0 to 3 times that of the basic raw material; The raw materials are dried under vacuum conditions at 80-120°C for 600-1000 minutes, then mixed in a mixing tank, and mixed by mechanical ball milling for 1000-1500 minutes; 3. Put the uniformly mixed raw material powder into a graphite boat, and then put it into a closed pressure vessel In the process, the airtight pressure vessel is cooled by circulating water, and the reaction is carried out under a protective atmosphere with a pressure of 0-5Mpa or under vacuum conditions, and the ignition makes the raw material...

specific Embodiment approach 2

[0027]Embodiment 2: In this embodiment, no diluent hafnium diboride is added in step 1. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: In this embodiment, the basic raw materials are weighed according to the following weight percentages in step 1: 51% of hafnium dioxide, 18% of boric anhydride, and 31% of magnesium powder. The average particle size can vary from 1 micron to 10 microns, and the purity is greater than 99%. Other steps are the same as in the first embodiment.

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Abstract

A combustion synthesis method of high purity diboride hafnium micropowder relates to a synthesis method of diboride hafnium micropowder material. The invention solves the problems of high raw materials cost, high energy consumption, long production period and high processing cost in the existing preparation methods of diboride hafnium micropowder. The invention proportions the basic raw material according to the weight percentage: diboride hafnium: 30 percent-60 percent, boron oxide: 10 percent -40 percent, magnesium powder: 15 percent -50 percent and the weight of added diluent diboride hafnium is 0-3 times of the basic material; being dried and mixed, the material is put into a closed pressure vessel that is cooled with cycling water; the raw material is transformed into products by propagating combustion after being ignited and the diboride hafnium micropowder is obtained after magnesium oxide is removed by acid pickling. The invention can be realized by replacing partial boron oxide and magnesium powder with boron carbide. The invention has the advantages of high reaction speed, short synthesis time, saving a great deal of energy, low cost, high production efficiency and high product purity.

Description

technical field [0001] The invention relates to a synthesis process of hafnium diboride micropowder material. Background technique [0002] Hafnium diboride has high melting point, high hardness, good electrical conductivity, thermal conductivity and good neutron absorption performance, and has important applications in the fields of ultra-high temperature materials, superhard materials, electrode materials and neutron absorbing materials. With the development of material science and technology, the application fields of hafnium diboride ceramics and composite materials are becoming more and more extensive. Obtaining low-cost, high-quality hafnium diboride micropowders is an important research and development direction at home and abroad. Hafnium diboride is difficult to sinter, and in order to improve the sintering performance, ultrafine powder must be obtained. Although the performance of nano micropowder is superior, the cost is very high, and it is difficult to dispers...

Claims

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Application Information

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IPC IPC(8): C01B35/04C01F17/00
Inventor 郑永挺赫晓东韩杰才
Owner HARBIN INST OF TECH
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