Self-spreading metallurgical process of preparing LaB6 powder

A self-propagating, metallurgical technology, applied in the field of boride powder material preparation, can solve the problems of difficult process control, complex process, high production cost, avoid the existence of borates, low process condition requirements, and reduce raw material costs. Effect

Active Publication Date: 2006-05-17
NORTHEASTERN UNIV
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Problems solved by technology

Since La is easy to oxidize, simple B is expensive, and the burning loss is serious. The operation needs to be carried out in a vacuum or an inert atmosphere. This method requires high equipment and difficult process control.
The boron thermal reduction method is the La 2 o 3 (or LaCl 3 ) and boron powder mixed, high temperature reaction synthesis LaB 6 Powder, because the raw material is high-purity boron powder, so the production cost is high
The principle of carbothermal reduction method is that in La 2 o 3 Add B and C or B to 4 C, then make the mixture into pellets, and heat it ...

Method used

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  • Self-spreading metallurgical process of preparing LaB6 powder

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Embodiment 1

[0025] Take La 2 o 3 , B 2 o 3 , Mg powder by mass ratio La 2 o 3 :B 2 o 3 : Mg is the ratio batching of 100: 128: 160, namely magnesium powder is excessive 3%, raw material is mixed uniformly with mortar, and then the mixed raw material is pressed into cylindrical block, and the pressure of sample pressing is 10MPa, and the pressed The blank sample is placed in a self-propagating reaction furnace, and the blank sample is heated at a constant temperature in an air atmosphere. The furnace temperature is controlled at 700°C until the self-propagating reaction is initiated, then the heating is stopped, and the reaction product is collected after natural cooling to room temperature; Dilute sulfuric acid is used as the leaching agent, and the theoretical excess of acid is 20%. The combustion product is directly leached at room temperature without being crushed. The leaching time is 30h, filtered, and the filtered product is washed with deionized water circulation. Then use 5...

Embodiment 2

[0027] Take La 2 o 3 , B 2 o 3 , Mg powder, by mass ratio La 2 o 3 :B 2 o 3 : Mg is the ratio batching of 100: 140: 170, namely magnesium powder is excessive 10%, the raw material is mixed uniformly with a mortar, then the mixed raw material is pressed into a cylindrical block, the pressure of the sample is 20MPa, and the pressed The blank sample is placed in a self-propagating reaction furnace, and the blank sample is heated at a constant temperature in an air atmosphere. The furnace temperature is controlled at 750°C until the self-propagating reaction is initiated, then the heating is stopped, and the reaction product is collected after natural cooling to room temperature; Dilute sulfuric acid is used as the leaching agent, the theoretical excess of acid is 20%, the combustion product is directly leached at room temperature without crushing, the leaching time is 40h, filtered, and the filtered product is washed with deionized water circulation. Then use 5% hydrochlor...

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Abstract

The self-spreading metallurgical process of preparing LaB6 powder adopts La2O3, B2O3 and Mg in the mass ratio of 100 to 115-140 to 160-170 as material, and includes the steps of: mixing material and pressing into block; setting inside self-spreading reaction furnace and detonating directly or in constant temperature mode to initiate self-spreading reaction; cooling naturally after reaction to obtain primary product; lixiviating with dilute as lixiviating agent at room temperature, reinforced lixiviating of the filtered extract of the foregoing step with hydrochloric acid as lixiviating agent, filtering, washing and stoving to obtain LaB6 powder. The present invention has low material cost, low power consumption, simple operation and relaxed technological conditions. The product obtained through self-spreading produce producing process has high purity, small granularity, high activity and other advantages.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of boride powder materials, in particular to the preparation of LaB by self-propagating metallurgy 6 powder method. Background technique [0002] LaB 6 It has the characteristics of high melting point, high strength and high chemical stability, and it also has many special functions, such as: low electronic work function, constant specific resistance, zero thermal expansion value in a certain temperature range, low volatility, resistance Strong poisoning ability, strong ion bombardment resistance, strong emission ability, different types of magnetic sequence and high neutron absorption coefficient, etc., these superior properties make it widely used in national defense and civilian industries, in military industry, aerospace and other high-tech The field also has broad application prospects, and more and more people pay attention to it. LaB 6 It is an excellent cathode emission mat...

Claims

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Application Information

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IPC IPC(8): C01B35/04
Inventor 张廷安豆志河赫冀成
Owner NORTHEASTERN UNIV
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