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Production method for superfine tungsten carbide powder

A production method, tungsten carbide technology, applied in the production field of ultra-fine tungsten carbide powder, can solve the problems of high free carbon and high total carbon content, achieve narrow particle size distribution, reduce production cost, and have good dispersion and uniformity Effect

Inactive Publication Date: 2012-08-29
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the total carbon content deviates from the stoichiometric carbon content by a large amount, and the free carbon content is still high

Method used

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  • Production method for superfine tungsten carbide powder
  • Production method for superfine tungsten carbide powder
  • Production method for superfine tungsten carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 The mass percentage of the carbon content of the precursor powder is 14.5%, and the balance is violet tungsten WO x , x is 2.60; add chromium trioxide with 1% mass percentage of precursor powder. The above-mentioned powder uses alcohol as the ball milling medium, the liquid-solid ratio is 400ml / kg, and the ball milling time is 24 hours. The ball-milled powder is dried in an oven at 80-95°C for 3 hours. The dried powder is put into a graphite boat and carbonized once in a non-oxidizing atmosphere. The carbonization temperature is 1000-1100°C and the carbonization time is 1 hour. The carbonized product was ball milled and mixed for 3 hours, and the total carbon content was detected to be 5.96%. Adjust the amount of carbon to 6.15%, and then ball mill and mix for 6 hours, then put it into a graphite boat, and put it in the H 2 Carry out secondary carbonization in the middle, the secondary carbonization temperature is 1200 ~ 1300 ℃, and the carbonization time is...

Embodiment 2

[0018] Example 2 The mass percentage of the carbon content of the precursor powder is 14.0%, and the balance is violet tungsten WO x , x is 2.65; add 0.7% chromium trioxide of precursor powder mass percentage. The above-mentioned powder uses alcohol as the ball milling medium, the liquid-solid ratio is 400ml / kg, and the ball milling time is 18 hours. The ball-milled powder is dried in an oven at 80-95°C for 3 hours. The dried powder is put into a graphite boat and carbonized once in a non-oxidizing atmosphere. The carbonization temperature is 1000-1100°C and the carbonization time is 2 hours. The carbonized product was ball milled and mixed for 2 hours, and the total carbon content was detected and analyzed to be 5.43%. Adjust the amount of carbon to 6.25%, and then mix for 4 hours, and put the carbonized product of the adjusted carbon into the graphite boat. 2 Carry out secondary carbonization in the middle, carbonization temperature 1200 ~ 1300 ℃, carbonization 2 hours. T...

Embodiment 3

[0019] Example 3 The mass percentage of the carbon content of the precursor powder is 13.4%, and the balance is violet tungsten WO x , x is 2.70; add 0.3% chromium trioxide of precursor powder mass percentage. The above powder is milled with alcohol as the ball milling medium, the liquid-solid ratio is 400ml / kg, and the ball milling time is 12 hours. The ball-milled powder is dried in an oven at 80-95°C for 3 hours, and the dried powder is put into a graphite boat for primary carbonization in a non-oxidizing atmosphere. The primary carbonization temperature is 1100-1250°C, and the carbonization time is 3 hours. The primary carbonized product was ball milled and mixed for 2 hours, and the total carbon content was detected to be 5.33%. Adjust the amount of carbon to 6.20%, and then ball mill and mix for 3 hours, put it into a graphite boat, and 2 Carry out secondary carbonization in the middle, the secondary carbonization temperature is 1300 ~ 1400 ℃, and the carbonization tim...

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Abstract

The invention discloses a production method for superfine tungsten carbide powder. The method comprises the following steps: performing wet grinding or dry grinding by using precursor powder containing carbon black and purple tungsten oxide; performing primary carbonization; adjusting the carbon amount of the product subject to the primary carbonization; and performing secondary carbonization to obtain the superfine tungsten carbide powder. Compared with other tungsten sources, the purple tungsten oxide has a loose needle-like aggregate structure and is suitable for preparing fine particles in the aspect of appearance. The purple tungsten oxide is subjected to ball milling for a long time, so the particle size is smaller; the purple tungsten oxide is directly reduced and carbonized under the property condition; the secondary carbonization is performed after the carbon amount is adjusted to the proper value after the primary carbonization, so the carbon content of the product is controlled well, the produced superfine tungsten carbide powder has narrow particle size distribution and high dispersibility and uniformity, the total carbon amount is closer to the carbon amount through stoichiometry, and the free carbon amount is low. The invention is simple in production process and has no special requirement on equipment. By the production method for dry grinding of the precursor powder, the production cost can be greatly reduced.

Description

technical field [0001] The invention relates to a production method of superfine tungsten carbide powder, in particular to a method for producing superfine tungsten carbide powder by direct reduction carbonization. Background technique [0002] The ultra-fine cemented carbide made of ultra-fine tungsten carbide powder has the characteristics of high strength and high hardness, which effectively solves the contradiction between the hardness and strength of traditional cemented carbide, and is widely used in the production of micro-drills and lattices for integrated circuit boards. Printer printing needles, precision tools and molds, cutting tools for difficult materials, woodworking tools, medical dental drills, etc. [0003] Direct reduction carbonization technology is an advanced technology for producing ultra-fine tungsten carbide powder. Generally, tungsten-containing precursor powder and a certain proportion of carbon source are heated in a non-oxidizing atmosphere, and ...

Claims

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Application Information

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IPC IPC(8): C01B31/34B82Y40/00C01B32/949
Inventor 张湘周春成
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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