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A kind of preparation method of rare metal boride

A rare metal, boride technology, applied in the direction of metal boride, boron/boride, etc., can solve the problems of process energy consumption, high cost, product purity decline, difficult industrial application, etc., to improve the reaction conversion rate and crystallinity. Good, high conversion rate

Active Publication Date: 2021-05-18
湖南澎越新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively improve the mass transfer efficiency of the solid phase, the introduction of molten chloride salts puts forward higher requirements on the synthesis equipment. At the same time, it is inevitable that the molten salt phase will enter the boride phase at high temperature, which will easily lead to a decrease in product purity.
CN201710736601.2 proposes the idea of ​​sintering after high-temperature ball milling, but the process requires long-term high-energy ball milling, isostatic pressing and other processing methods, and the process energy consumption and cost are high, making it difficult for industrial application

Method used

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  • A kind of preparation method of rare metal boride
  • A kind of preparation method of rare metal boride
  • A kind of preparation method of rare metal boride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 1.2kg of tantalum oxide, 0.6kg of boron carbide, and 0.6kg of metal aluminum powder, mix them evenly, put them into the mold, press them at 70MPa and 120°C for 20min, put the formed sample blocks into the roasting furnace, and vacuum them. After inhalation, the mixed gas of hydrogen and argon with a hydrogen concentration of 2% was introduced at a rate of 1L / min, and the temperature was raised to 600°C at a rate of 2°C / min. After 60 minutes, cool down to room temperature at a cooling rate of 5°C / min. After the product is crushed and sieved, the obtained powder product is mixed with H + Dilute nitric acid with a concentration of 1mol / L was mixed at a solid-to-liquid ratio of 1:10, leached in a water bath at 60°C for 30 minutes and then filtered, and the filter residue was washed and dried to constant weight to obtain tantalum diboride powder. The product XRD pattern is attached figure 1 shown.

Embodiment 2

[0030] Take 1.6kg of tungsten trioxide, 0.5kg of boron oxide, and 0.4kg of tin powder, mix them evenly, put them into the mold, press them at 20MPa and 100°C for 20min, put the formed sample blocks into the roasting furnace, and vacuum them. After inhalation, a mixed gas of hydrogen and argon with a hydrogen concentration of 10% was introduced at a rate of 1.2L / min, and the temperature was raised to 1000°C at a rate of 5°C / min. After continuing to keep warm for 30 minutes, cool down to room temperature at a cooling rate of 5°C / min. After the product is crushed and sieved, the obtained powder product is mixed with H + Dilute hydrochloric acid with a concentration of 1.5mol / L was mixed at a solid-to-liquid ratio of 1:10, leached in a water bath at 80°C for 30 minutes and then filtered, and the filter residue was washed and vacuum-dried to constant weight to obtain ditungsten pentaboride powder. The product XRD pattern is attached figure 2 shown.

Embodiment 3

[0032] Take 0.6kg of chromium carbide powder, 1.2kg of boron oxide, and 0.1kg of metal aluminum powder, mix them evenly, put them into the mold, press them at 70MPa and 120°C for 20min, put the formed sample block into the roasting furnace, and vacuum After purging, feed a mixed gas of hydrogen and argon with a hydrogen concentration of 10% at a rate of 1 L / min, raise the temperature to 500 °C at a rate of 10 °C / min, keep warm for 360 min, and then continue to heat up to 1600 °C at a rate of 40 °C / min. After 90 minutes of heat preservation, the temperature was lowered to room temperature at a rate of 5°C / min. After the product is crushed and sieved, the obtained powder product is mixed with nitric acid: hydrochloric acid at a ratio of H + Dilute hydrochloric acid with a concentration of 3 mol / L was mixed at a solid-to-liquid ratio of 1:5, leached in a water bath at 60°C for 180 minutes, filtered, and the filter residue was washed and dried to constant weight to obtain tantalum...

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Abstract

The invention provides a preparation method of rare metal borides. First, the rare metal component, boron component and reaction aid are mixed according to a certain ratio, and then pressed into tablets. The cooling system cools the roasted product, breaks the prepared roasted product, and obtains rare metal boride powder with high purity, regular particle shape and narrow particle size distribution after purification and separation. The process of the invention is simple and reliable, and can realize rare metal boride powder. Industrial preparation of metal borides.

Description

technical field [0001] The invention relates to the technical field of metallurgical materials, in particular to a method for preparing rare metal borides. Background technique [0002] Rare metal borides generally have high melting point, high hardness, and excellent corrosion resistance, and are widely used in material surface spraying, cemented carbide ceramics, high-temperature wear-resistant materials, high-temperature structural materials and other fields. With social development and scientific and technological progress, the application fields of rare metal boride materials will be further expanded, and an efficient and simple preparation method with industrial feasibility is urgently needed. [0003] At present, there are not many reports on Me-B series compounds at home and abroad, mainly focusing on binary system compounds such as tungsten-boron, tantalum-boron, zirconium-boron, and hafnium-boron. The main synthesis methods include high-temperature sintering, chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04
CPCC01B35/04C01P2002/72C01P2006/80
Inventor 彭宁
Owner 湖南澎越新材料有限公司
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