Injection angle set-up

Posted by Andrea ( on 18:29:28 05/05/06

Dear All,
I made some tests with METCO 45VF-NS ( Cr: 25,5%, Ni:10.5%, W:7.5% Co: Balance) powder with 6 mm nozzle of F4-MB plasma gun and I would like to set-up the powder injection angle in 75 °(which is the powder manufacturer recommendation) but it was impossible because of after 2 spray cycles the gun spat molten big powder particles on the test plate and I could see molten powder particles around the nozzle. I tried to reduce the powder quantity and modified the carrier gas quantity, but it did not help to set-up the 75 ° injection angle.
Could you give me some ideas how can I solve this problem?

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