Ultrafine tungsten carbide powder with uniform grain size and preparation method thereof

By controlling the reduction temperature and hydrogen flow rate in a reverse hydrogen reduction method, combined with high-temperature carbonization and airflow crushing, the problem of uneven grain size in ultrafine tungsten carbide powder was solved, and ultrafine tungsten carbide powder with uniform particle size distribution was prepared, thus improving the performance of cemented carbide.

CN122102126APending Publication Date: 2026-05-29ZHUZHOU HARD ALLOY GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUZHOU HARD ALLOY GRP CO LTD
Filing Date
2026-01-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the production process of ultrafine tungsten carbide powder, grain inhomogeneity leads to a decline in the quality of cemented carbide products, especially the problem of abnormal growth of coarse particles and the formation of coarse particles due to the aggregation of fine particles.

Method used

By controlling the reduction temperature and hydrogen flow rate, ultrafine tungsten powder was prepared using the reverse hydrogen reduction method. Combined with high-temperature carbonization and airflow crushing, the uniformity of the tungsten-carbon mixed powder was ensured, and finally, ultrafine tungsten carbide powder with uniform grain size was prepared.

Benefits of technology

This method achieves a concentrated particle size distribution of ultrafine tungsten carbide powder, reduces the formation of coarse particles, improves the bending strength and thermal sensitivity of cemented carbide, and enhances the mechanical properties of the alloy.

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Abstract

The application discloses a tungsten carbide powder with uniform crystal grains and a preparation method thereof. The preparation method of the tungsten carbide powder with uniform crystal grains comprises the following steps: S1, raw material reduction treatment: obtaining ultrafine tungsten powder by reverse hydrogen reduction of tungsten oxide raw material; the hydrogen flow of the reverse hydrogen reduction is 600-750 m 3 / h, and the temperature of the reverse hydrogen reduction is divided into six zones: the temperature of the first zone is 900-950 DEG C, the temperature of the second zone is 900-950 DEG C, the temperature of the third zone is 900-950 DEG C, the temperature of the fourth zone is 900-950 DEG C, the temperature of the fifth zone is 950-1030 DEG C, and the temperature of the sixth zone is 980-1050 DEG C; S2, preparation of tungsten-carbon mixed powder: obtaining tungsten-carbon mixed powder by carbon preparation on the ultrafine tungsten powder, and the carbon content of the tungsten-carbon mixed powder is 6.08-6.18%; and S3, preparation of ultrafine tungsten carbide powder: sequentially performing high-temperature carbonization and airflow crushing on the tungsten-carbon mixed powder. The preparation method makes the WO2 performance consistent, thereby laying a uniform foundation for the phase change process from WO2 to WO X .
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