Preparation method of granulated WC-Co thermal spraying powder
A thermal spray powder and granulation technology, applied in coating, melt spraying, metal processing equipment and other directions, can solve the problems of powder collision tower wall easily broken, spray granulation powder broken, poor fluidity and other problems, to improve the coating Matrix properties, improving spheroidization, avoiding crushing and screening effects
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Embodiment 1
[0033] 1) Alcohol wet grinding:
[0034] Take 200kg of carburized nano-WC-6Co composite powder with Co-coated WC grain size ≤200nm and Co mass content 6%, add it to a 300L tiltable rolling ball mill, add 4.8Kg of binder paraffin wax, 12.5L oleic acid, and alcohol 50Kg, then add the ball grinding rod Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, totaling 1000kg, and ball mill for 48h to obtain the ball grinding slurry;
[0035] The chemical composition analysis table of the raw material carburized nano-WC-6Co composite powder used in this embodiment is shown in Table 1. The total carbon in the powder is high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.
[0036] 2) Pressure spray granulation:
[0037] In step 1), add 10Kg of alcohol to wet grinding for 10 minutes, discharge the material through a 325-mesh screen, and heat while stirring to prevent the paraffin from separating out;
[0038] The agitated slurry is sprayed and granulated by a fully...
Embodiment 2
[0046] 1) Alcohol wet grinding:
[0047] Take 240kg of carburized nano-WC-10Co composite powder with Co-coated WC grain size ≤200nm and Co mass content 10%, add it to a 300L tiltable rolling ball mill, add binder paraffin wax 4.8Kg, oleic acid 15L, alcohol 60Kg, then add 1200kg ball grinding rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, and ball mill for 48 hours to obtain ball grinding slurry;
[0048] The chemical composition analysis table of the raw material carburized nano-WC-10Co composite powder used in this embodiment, as shown in Table 1, shows that the total carbon in the powder is high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.
[0049] The SEM morphology of the ball abrasive slurry obtained in this example after natural drying is as follows figure 1 As shown, it can be seen that the WC grain size of the ball abrasive slurry obtained in this example is uniform without agglomeration, and the paraffin wax is uniformly coated ...
Embodiment 3
[0062] 1) Alcohol wet grinding
[0063] Take 240kg of carburized nano-WC-12Co composite powder with Co-coated WC grain size ≤200nm and Co mass content 12%, put it into a 300L tiltable rolling ball mill, add 7.2Kg of paraffin wax, 15L of oleic acid, and 60Kg of alcohol , Then add 1200kg ball grinding rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, and ball mill for 72h to obtain ball grinding slurry;
[0064] As shown in Table 1, the chemical composition analysis table of the raw material carburized nano-WC-12Co composite powder used in this embodiment shows that the total carbon in the powder is relatively high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.
[0065] 2) Pressure spray granulation:
[0066] Add 12Kg of alcohol into the ball mill slurry obtained in step 1) for 10 minutes of wet grinding, discharge the material through a 325-mesh screen, and heat it while stirring to prevent the paraffin from separating out;
[0067] The agitated...
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