A low-cost high-purity silicon hexaboride production process
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A pure silicon hexaboride and production process technology, applied in the direction of boron/boride, etc., can solve the problems of high production cost, high fineness requirements of raw silicon powder and boron powder, etc., to achieve short production cycle, guaranteed reduction effect, The effect of high product purity
Active Publication Date: 2022-08-05
辽宁中色新材科技有限公司
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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
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[0022] (1) Select raw materials: the purity of diboron trioxide is 99.5%, and the fineness is 325 meshes; the purity of potassium borohydride is 99.9%, and the fineness is 400 meshes;
[0023] Ball milling and mechanical alloying: put 19.659 kg of diboron trioxide and 30.341 kg of potassium borohydride (molar ratio of 1:2) into an interstellar ball mill, reaction equation B 2 0 3 +2KBH 4 =4B+2KOH+H 2 O+2H 2 , rushed into the argon protection, the ball-milling mixing time is guaranteed to be 12 hours, and the mechanical alloying is achieved, and the mixed powder is obtained;
[0024] (2) Press the mixed powder according to 500 grams per portion with a 315-ton hydraulic press, and the pressing pressure is not less than 25 MPa, so as to ensure that the powder is densely combined and fully replaced and reacted to obtain a pressed block;
[0025] (3) The pressed block material is loaded into a graphite crucible according to 10 kilograms of the charging amount of each furnace, p...
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Abstract
A low -cost high -purity hexal silicon production process, boron -dioxide and potassium borohydride, suppress it into a block after the ghostly protection, the ball mill, put it into a vacuum carbon pipe furnace, take the time, and heat the heat at 750 ° C.5 hours; heating up to 1250 ° C, continue to heat up until the pressure in the furnace is slightly pressed, the reaction reaction is completely ended, the monomer boron and potassium hydroxide mixture in the graphite cricket will be obtained.Boron powder; After the boron powder and silicon powder ball grind, put it into the spreading reactor, the reaction kettle takes time, the real vacuum is 1 Pa, the power is sent to the tungsten filament, ignited the pink powder, the high temperature self -spread reaction, the reaction reaction, the reaction reaction, the response,End, cool down, remove miscellaneous, get high -purity silicon.Based on boron dioxide and potassium boroside as the raw material, the cost of raw materials is relatively low, and the entire process is reasonable and controllable. The purity of silicon silicon produced is 99.5 %, which is suitable for industrial production.
Description
technical field [0001] The invention relates to a low-cost and high-purity silicon hexaboride production process. Background technique [0002] Boron (B) is a light element that can form the compound silicon hexaboride with elements of Group IVA. Silicon hexaboride has excellent thermoelectric properties, its electrical conductivity is 10 / Ω·cm-200 / Ω·cm from room temperature to 1000K, and its hot end as a high-temperature thermoelectric material can be used at a temperature of 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 conductivity, high melting point, high hardness and high stability. Features, can be widely used in electronics and military. [0003] CN 106082250A discloses "a preparation method of silicon hexaboride powder", the steps are: weighing silicon powder with an average particle size of <10μm and boron pow...
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