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Low-cost high-purity silicon hexaboride production process

A pure silicon hexaboride and production process technology, applied in the direction of boron/boride, etc., can solve the problems of high fineness requirements for raw silicon powder and boron powder, high production costs, etc., to achieve guaranteed reduction effect, short production cycle, Reasonable and controllable process effect

Active Publication Date: 2020-12-25
辽宁中色新材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simple boron powder is used as raw material, the production cost is high, and the fineness requirements for raw material silicon powder and boron powder are relatively high

Method used

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  • Low-cost high-purity silicon hexaboride production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] (1) Select raw materials: diboron trioxide has a purity of 99.5%, and a fineness of 325 mesh; potassium borohydride has a purity of 99.9%, and a fineness of 400 mesh;

[0023] Ball milling and mechanical alloying: put 19.659kg of diboron trioxide and 30.341kg of potassium borohydride (molar ratio 1:2) into the interstellar ball mill, reaction equation B 2 0 3 +2KBH 4 =4B+2KOH+H 2 O+2H 2 , rushed into the protection of argon, the ball mill mixing time is guaranteed to be 12 hours, to achieve mechanical alloying, and to obtain mixed powder;

[0024] (2) The mixed powder is pressed according to 500 grams per part with a 315-ton hydraulic press, and the pressing pressure is not less than 25 MPa, so as to ensure that the powders are densely combined and can be fully replaced and reacted to obtain pressed blocks;

[0025] (3) Put the compressed block material into a graphite crucible according to the charging amount of 10 kg per furnace, put it into a vacuum carbon tube f...

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Abstract

The invention relates to a low-cost high-purity silicon hexaboride production process, which comprises the following steps: pressing diboron trioxide and potassium borohydride into blocks after ball-milling and mixing under the protection of argon, putting the blocks into a vacuum carbon tube furnace, performing vacuumizing, and keeping the temperature at 750DEG C for 5 hours; conducting heating to 1250DEG C, continuously keeping the temperature until the pressure in the furnace is slightly positive and the reduction reaction is completely finished, putting the obtained monomer boron and potassium hydroxide mixture in a graphite crucible into distilled water, and conducting heating, cleaning and drying to obtain boron powder; conducting ball-milling and mixing on the boron powder and silicon powder, putting the mixture into a self-propagating combustion reaction kettle, vacuumizing the reaction kettle to a vacuum degree of 1Pa, powering on a heating tungsten wire, igniting zirconium powder, carrying out high-temperature self-propagating combustion combination reaction, and after the reaction is finished, performing cooling and removing impurities to obtain the high-purity silicon hexaboride. Diboron trioxide and potassium borohydride are used as the raw materials, the cost of the raw materials is relatively low, the whole process is reasonable and controllable, the purity of the produced silicon hexaboride is 99.5%, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a low-cost high-purity silicon hexaboride production process. Background technique [0002] Boron (B) is a light element that can form a compound silicon hexaboride with group IVA elements. Silicon hexaboride has excellent thermoelectric properties, and its electrical conductivity from room temperature to 1000K is 10 / Ω·㎝-200 / Ω·㎝, and its use temperature as a high-temperature thermoelectric material can reach 1200 °C; The degree of valence bond is higher than that of carbide, so it has high hardness; silicon hexaboride is very inert and has stable chemical properties; in short, silicon hexaboride has high electrical conductivity, high melting point, high hardness and high stability Features, can be widely used in electronics and military industry. [0003] CN 106082250A discloses "a method for preparing silicon hexaboride powder". The steps are: weighing the silicon powder with an average particle size of <10 μm and the bor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02
CPCC01B35/02C01P2006/80C01P2002/72C01P2004/61C01P2004/01
Inventor 张洪涛
Owner 辽宁中色新材科技有限公司
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