As {HEAD ~ a method} of spraying {TAIL ~ aluminum} or aluminum alloy, there is arc spraying and plasma spraying 
of spraying
As { HEAD ~ a method } of spraying { TAIL ~ aluminum } or aluminum alloy , there is arc spraying and plasma spraying
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH