Preparation method of ultrafine tantalum carbide powder

A technology of tantalum carbide and powder, which is applied in the field of preparation of ultra-fine tantalum carbide powder, can solve the problems of slow diffusion speed, coarse crystal grain, low activity, etc., and achieve the effect of short process, low carbonization temperature and simple procedure

Active Publication Date: 2011-07-27
长沙伟徽高科技新材料有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

If the grains of TaC powder are coarse, the activity is low, the diffusion speed is slow, and the agglomeration phenomenon is serious during the alloy sintering process, which makes it difficult to meet the increasingly higher requirements of cemented carbide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After compressing the tantalum hydroxide (F≤1.0% (wt)) of the slurry obtained by purchasing and drying in an oven at 200°C, 43 kilograms of nanoscale tantalum hydroxide were obtained, and then 43 kilograms of tantalum hydroxide and 6.64 Kilograms of carbon black were mixed, and the temperature was slowly raised to 1250°C for 3 hours, the high temperature holding time was 10 hours, and the vacuum degree was 12Pa. Cool with H2 for 13 hours. Ball mill after discharge. The particle size of Fsss was measured as 0.55 μm by sampling, and the chemical composition met the requirements.

Embodiment 2

[0019] After compressing the purchased slurry-like tantalum hydroxide (F≤1.0%) and drying it in an oven at 220°C, 52 kg of nano-scale tantalum hydroxide was obtained, and then 52 kg of tantalum hydroxide and 8.04 kg of carbon black Mix and heat up slowly for 3.5 hours to 1280°C, the high temperature holding time is 12 hours, and the vacuum degree is 10Pa. Cool with H2 for 14 hours. Ball mill after discharge. Its Fsss particle size was measured as 0.58 μm by sampling, and its chemical composition met the requirements.

[0020] Attached Table 1 Performance Index of Ultrafine TaC

[0021] batch number

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Abstract

The invention relates to a preparation method of ultrafine tantalum carbide powder. The technical scheme is as follows: the preparation method comprises the steps of: drying pulpy tantalum hydroxide bought in a baking oven at the temperature of 180-250 DEG C, obtaining nano-level tantalum hydroxide, then mixing the nano-level tantalum hydroxide and carbon black, increasing the temperature slowly to be 1200-1300 DEG C, carrying out vacuum carbonization for 6-14 hours and obtaining the ultrafine tantalum carbide (TaC) powder of which the powder granularity is less than 0.6mum and the chemical compositions conform to the requirements of preparing hard alloy. The preparation method of the ultrafine tantalum carbide powder provided by the invention has the advantages that the process is short, the operation is easy to be realized and the energy is saved.

Description

technical field [0001] The invention relates to a preparation method of superfine tantalum carbide powder. technical background [0002] The main application field of TaC is cemented carbide inserts. One of its functions: as a cemented carbide grain growth inhibitor, after adding TaC, it can prevent the growth of grains in the cemented carbide sintering process; its second function is Together with TiC, it forms the third dispersed phase except WC and Co, which significantly increases the thermal shock resistance, crater resistance and oxidation resistance of cemented carbide and improves the hot hardness of cemented carbide. [0003] Due to the continuous improvement of application requirements and the harsh application environment, the metallographic structure of cemented carbide must be more uniform and finer, which puts forward higher requirements for the particle size and uniformity of TaC powder. If the grains of TaC powder are coarse, the activity is low, the diffusi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30
CPCY02P20/10
Inventor 郭伟
Owner 长沙伟徽高科技新材料有限公司
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