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Method for preparing amorphous silicon powder

A technology of amorphous silicon and powder, which is applied in the field of preparation of amorphous silicon powder, can solve the problems of low primary utilization rate of raw materials, high production condition requirements, a large number of by-products, etc. simple craftsmanship

Active Publication Date: 2017-07-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned preparation methods have very high requirements on production conditions, high energy consumption, a large number of by-products, low primary utilization of raw materials, and certain dangers.

Method used

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  • Method for preparing amorphous silicon powder

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Effect test

Embodiment 1

[0023] The silica powder was dried in a vacuum oven at 120 °C for 12 h. Under the protection of argon atmosphere, firstly put 0.035 mol of magnesium hydride and 0.018 mol of silicon dioxide powder into the ball milling jar respectively, then put the balls into the ball milling jar and seal it. The ratio of ball mass to material mass is 80:1. At room temperature, the ball mill tank was continuously ball milled at a speed of 500 rpm for 180 h. After taking it out, it was washed 3 times with dilute acid and ethanol, and washed with deionized water until the solution was neutral. The powder obtained by drying and cooling is amorphous silicon powder.

Embodiment 2

[0025] The silica powder was dried in a vacuum oven at 80 °C for 24 h. Under vacuum conditions, first transfer 0.03 mol of calcium hydride and 0.0125 mol of silicon dioxide to the ball mill jar, then put the balls into the ball mill jar and seal it. The ratio of ball mass to material mass is 160:1. At room temperature, the ball mill tank was continuously ball milled at 450 rpm for 220 h, and after taking it out, it was washed with dilute acid and ethanol three times, and washed with deionized water until the solution was neutral. The powder obtained by drying and cooling is amorphous silicon powder.

Embodiment 3

[0027] The silica powder was dried in a vacuum oven at 90 °C for 10 h. Under the protection of an argon atmosphere, 0.024 mol of magnesium hydride, 0.021 mol of calcium hydride and 0.018 mol of silicon dioxide were loaded into a ball mill jar, and then the balls were put into the ball mill jar and sealed. The ratio of ball mass to material mass is 200:1. At room temperature, the ball mill jar was continuously ball milled at a speed of 550 rpm for 168 h. After taking it out, it was washed 3 times with dilute acid and ethanol, and washed with deionized water until the solution was neutral. The powder obtained by drying and cooling is amorphous silicon powder.

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Abstract

The invention discloses a method for preparing amorphous silicon powder. The preparation method comprises the following steps: weighing raw materials silicon dioxide and metal hydride in a mass ratio of 1:2-6 under the protection of inert atmosphere; putting in a sealed ball mill tank, performing ball mill reaction for 12-300 hours at a rotating speed of 200-600rpm at room temperature; and removing and separating byproducts from the solid product after the ball mill reaction is finished to obtain the amorphous silicon powder. The method for preparing amorphous silicon powder has the characteristics of simple process, low cost, high efficiency and the like, and is safe, economical and environment-friendly.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of amorphous silicon preparation, and in particular relates to a preparation method of amorphous silicon powder. [0003] (2) Background technology [0004] Silicon (chemical formula: Si) has an atomic number of 14, and there are two types of amorphous silicon and crystalline silicon. Silicon is the most abundant element (25.7%) in the earth's crust except oxygen, but it rarely occurs in nature in the form of simple substance, mainly in the form of complex silicate or silicon dioxide. At present, the silicon chemical preparation methods that have been industrialized mainly include: (1) Improved trichlorosilane hydrogen reduction method, the principle is to reduce high-purity trichlorosilane with high-purity hydrogen on a high-purity silicon core at about 1100 ° C, and generate polysilicon deposited on on the silicon core. (2) Silane method, SiH 4 The gas is introduced into the silane decompositi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/023
CPCC01B33/023C01P2002/72
Inventor 梁初陈云王凯夏阳张文魁甘永平陶新永张俊黄辉
Owner ZHEJIANG UNIV OF TECH
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