Nano-tungsten Carbide - cobalt Alloy Preparation Methods

The present invention provides a nano tungsten carbide - cobalt alloy preparation methods, including hydrogen reduction and carbonization reaction. Specific steps are as follows:

1) The percentage by weight of the component WC-Co cemented carbide nano-set, i.e., set the WC alloy component content of 70 ~ 97wt%, Co content is 3 ~ 30wt%, take the appropriate amount of the acid-containing W aqueous ammonium nitrate solution containing cobalt Co amount of incorporation of ammonia, add the right amount of polyethylene glycol and ethylene diamine and mix well;

2) Nitric acid was added to adjust PH value to 1.6 to 2.0 to precipitate WO3, CoO particles in the mixture;

3) Removal of ammonia, the above paste-like mixture into the container 1 to the calcined for 3 hours at 600 ~ 800 ℃, WO3, and CoO to form a mixed powder particles;

4) The above mixed powder is placed in a quartz tube inside a quartz boat, the quartz tube was evacuated to exclude oxygen;

5) Pass into the hydrogen reduction, hydrogen purity of 99.99%, through hydrogen for 1 to 3 hours to obtain a metal W, Co nanopowders;

6) Turn off the hydrogen to high-purity quartz tube filled with acetylene gas C2H2 W nanopowder metal carbide, carbonization temperature of 500 ~ 950 ℃, carbonization time is 0.5 to 3 hours, the optimum carbonization temperature is 600 to 900 ℃, carbonization time is 1 to 2 hours to obtain a WC-Co composite powder of nanoparticles;

7) Vacuum hot pressing and sintering process, made ​​WC-Co cemented carbide bulk material.

The present invention provides nano tungsten carbide - cobalt alloy preparation method, the mechanical strength, abrasion resistance and other technical performance indicators are better than existing technology can be widely used in the production of tools, dies, gauges, and various mining drill kinds of wear parts.


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