In situ preparation method for nano WC powder from porous carbon material

An in-situ synthesis, porous carbon technology, applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of many processes, unfavorable mass production, high cost, achieve control, good economy, simple process. Effect

Active Publication Date: 2008-03-26
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the traditional production process is difficult to produce WC that meets the requirements
At present, the preparation of nano-WC powder is mainly to make nano-WO from tungsten-containing compounds. 3 Or w, obtained by reducing and carbonizing high-purity C powder raw materials, which has many processes and high cost, which is not conducive to mass production

Method used

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  • In situ preparation method for nano WC powder from porous carbon material
  • In situ preparation method for nano WC powder from porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Using activated carbon as a carbon source, WC powder with a particle size of about 80 nm was prepared.

[0012] 1. Weigh the molar ratio of orthotungstic acid and activated carbon to be 1:2;

[0013] 2. Add ammonia water to the orthotungstic acid drop by drop, and keep stirring until the orthotungstic acid is completely dissolved;

[0014] 3. Add activated carbon to the 2 solution, cover with plastic wrap, and let it stand for 7 to 9 hours;

[0015] 4. Filter the solution that has been left standing, take the solid and put it in an oven, and dry it at 80°C for 4 hours;

[0016] 5. Put the dried solid into the filtrate, repeat steps 3 and 4 until the activated carbon absorbs all the liquid;

[0017] 6. Put the dried mixed powder into a tube furnace, keep it warm at 1000°C for 1 hour in a hydrogen atmosphere, and then cool it with the furnace;

[0018] 7. Take out the powder and grind it.

Embodiment 2

[0019] Example 2: Using expanded graphite as a carbon source to prepare WC powder with a particle size of about 200nm

[0020] 1. Weigh the molar ratio of orthotungstic acid and expanded graphite to be 1:2;

[0021] 2. Add ammonia water to the original tungstic acid drop by drop, and keep stirring to dissolve all the original tungstic acid, and add excess ammonia water;

[0022] 3. Add expanded graphite to the 2 solution, cover with plastic wrap, and let stand for 7-9 hours;

[0023] 4. Filter the solution that has been left standing, take the solid and put it in an oven, and dry it at 80°C for 4 hours;

[0024] 5. Put the dried solid into the filtrate, repeat steps 3 and 4 until the expanded graphite absorbs all the liquid;

[0025] 6. Put the dried mixed powder into the tube furnace, keep it warm for 1.5 hours above 1000°C in a hydrogen atmosphere, and then cool it with the furnace;

[0026] 7. Take out the powder and grind it.

Embodiment 3

[0027] Example 3: WC powder was prepared using activated carbon as a carbon source.

[0028] 1. Weigh the molar ratio of orthotungstic acid and activated carbon to be 1:1.5;

[0029] 2. Add ammonia water to the orthotungstic acid drop by drop, and keep stirring until the orthotungstic acid is completely dissolved;

[0030] 3. Add activated carbon to the solution obtained in the above step 2, cover with plastic wrap, and let stand for 7 to 9 hours;

[0031] 4. Filter the solution that has been left standing, take the solid and put it in an oven, and dry it at 80°C;

[0032] 5. Put the dried solid into the filtrate, repeat steps 3 and 4 until the activated carbon absorbs all the liquid;

[0033] 6. Put the dried mixed powder into the tube furnace, keep it warm for 1.5 hours above 1000°C in a hydrogen atmosphere, and then cool it with the furnace;

[0034] 7. Take out the powder and grind it.

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Abstract

The process of in-situ synthesizing nanometer WC powder on porous carbon material base includes: weighing ortho-tungstic acid and porous carbon material in certain ratio, dissolving ortho-tungstic acid in ammonia water, adding carbon material and standing for 7-9 hr, filtering, drying the soaked carbon material, soaking in the solution until absorbing all the ammonium tungstate, drying the mixture, heating the mixture inside a tubular furnace in hydrogen atmosphere at 1000 deg.c for 60-90 min, and grinding to obtain WC powder of 50-200 nm size. The molar ratio between ortho-tungstic acid and porous carbon material is preferably 1 to 1.5-2.5, and the porous carbon material is active carbon or expanded graphite. The process is suitable for industrial application and can control the size of WC powder.

Description

technical field [0001] The invention relates to a preparation method for in-situ synthesis of nano-WC powder, in particular to a method for in-situ synthesis of nano-WC powder on a porous carbonaceous material matrix, and belongs to the field of advanced material preparation. Background technique [0002] Cermets, such as WC, TiC, VC, etc., are widely used in the field of engineering technology because of their physical and chemical properties such as high melting point, hardness, and good corrosion resistance. At present, cermets are mostly used for tool materials and corrosion-resistant materials, among which WC is the most widely used cermet, and the world consumes about 2000 tons of WC-Co composite powder every year. WC has a high melting point, about 2600-2850°C, and a hardness of 16-22GPa (load is 500g). In addition, WC also has good oxidation resistance and corrosion resistance. Due to the excellent performance of WC, it has become the main raw material for the prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 陈志刚王玲朱小蓉赵小兵孔德军
Owner 溧阳常大技术转移中心有限公司
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