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Method for inorganic synthesizing submicron CaB6 polycrytal powder

A submicron-scale, synthetic sub-technology, applied in the direction of boron/boride, metal boride, etc., can solve the problems of particle sintering, easy agglomeration, complex reaction route, unsuitable for industrial production, etc., achieve regular particle shape and simple preparation process , evenly distributed effect

Inactive Publication Date: 2009-10-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above reports are generally complicated in terms of synthesis methods or reaction routes, sintering of particles is easy to agglomerate, most of them consume high energy, and are not suitable for industrial production.

Method used

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  • Method for inorganic synthesizing submicron CaB6 polycrytal powder
  • Method for inorganic synthesizing submicron CaB6 polycrytal powder
  • Method for inorganic synthesizing submicron CaB6 polycrytal powder

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Take 5.29 g of anhydrous CaCl 2 , 11.02 g B 2 o 3 and 12.01 g of Mg powder with anhydrous CaCl 2 , B 2 o 3 And the raw material specification of Mg powder is: anhydrous CaCl 2 The particle size range is 380-400 mesh, B 2 o 3 The particle size range is 150-180 mesh, the Mg particle size range is 150-180 mesh, except B 2 o 3 is an industrial raw material, CaCl 2 , Mg powder and other reagents are all analytical reagents. After fully mixing, add the stainless steel reaction tank, put the reaction tank into an Ar atmosphere protection heating furnace, keep it at 750 ° C for 20 minutes, and then cool it naturally. Open the tank and process and collect the product. The product is first soaked in 2.5M dilute hydrochloric acid and stirred for 30 minutes to dissolve impurities such as magnesium oxide, then suction filtered and washed with water to remove water-soluble impurities such as magnesium chloride. The filter cake is dried at 80°C for 8 hours, and finally 4.87 ...

Embodiment 2

[0024] Take 3.52 grams of Ca(OH) 2 , 11.04 g B 2 o 3 and 15.02 grams of Mg powder, of which Ca(OH) 2 , B 2 o 3 And the raw material specification of Mg powder is: Ca(OH) 2 The particle size range is 200-250 mesh, B 2 o 3 The particle size range is 250-280 mesh, the Mg particle size range is 250-280 mesh, except B 2 o 3 In addition to industrial raw materials, Ca(OH) 2 , Mg powder and other reagents are analytical reagents, fully mixed and then added to the stainless steel reaction tank. The reaction tank was put into an Ar atmosphere protection heating furnace, kept at 800° C. for 10 minutes, and then cooled naturally. Open the tank and process and collect the product. The product is first soaked in 5M dilute hydrochloric acid and stirred for 30 minutes to dissolve impurities such as magnesium oxide, then suction filtered and washed with water to remove water-soluble impurities such as magnesium chloride. The filter cake is dried at 80°C for 20 hours to obtain 4.91 ...

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Abstract

The invention relates to a method for inorganic synthesizing submicron CaB6 polycrytal powder. CaCI2 or Ca(OH)2 is reacted with B2O3 and magnesium powder at the temperature ranging from 700 to 850 DEG C, the mole ratio of the reaction is Ca2+:B2O3:Mg=0.5-1.5:2-4:8-14, and the reaction time range is 5-30 minutes. The product is isolated and purified to gain submicron CaB6 polycrytal powder. The submicron CaB6 polycrytal powder produced by the invention is regular in shape and uniform in distribution, and the granularity reaches the submicron. The invention has advantages of mild reaction condition, simple process, low energy consumption and being applicable to industrialization production.

Description

technical field [0001] The invention relates to the field of preparation of ceramic materials, in particular to an inorganic synthesis of submicron CaB 6 The method of polycrystalline powder. Background technique [0002] Calcium hexaboride (CaB 6 ) belongs to refractory metal oxygen-free compounds with cubic crystal structure (a=0.4145nm). It is a new type of semiconductor boride, also known as boride ceramics, with high melting point, high strength and stable chemical properties [1-4] , has a certain electrical conductivity and excellent anti-electromagnetic radiation performance. In addition, CaB 6 Composite materials have special properties of anti-high-energy neutron radiation, so they have special applications in the nuclear industry, which has attracted widespread attention. These superior properties determine that it has a wide range of application prospects in various device components of modern technology [5-9] . [0003] known to synthesize CaB 6 The prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
Inventor 谷云乐王吉林潘新叶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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