RT Journal Article ID 75b76f4c4d24cb26 A1 Ageorges, Helene A1 Grimaud, Alain A1 Fauchais, Pierre T1 PLASMA SPRAYED COATINGS OF MECHANOFUSED ALUMINA-STEEL PARTICLES JF High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes JO HTM YR 2010 FD 2012-03-19 VO 14 IS 4 SP 389 OP 399 K1 mechanofusion K1 plasma sprayed coating K1 plasma sprayed splat K1 alumina steel particle AB Steel particles (Fe + 19 wt% Cr and 11 wt% Ni) with a size distribution in the range between 50 and 100 μm were coated with pure α-alumina (99.99%) particles whose mean size was 0.6 μm using a mechanofusion process. It was possible to obtain particles with alumina shells with a mean thickness of 2−4 μm. EDS analysis showed that, according to the detection limit, no alumina was imbedded in the steel core and reciprocally no steel was included in the alumina shell. The composite powder was then plasma sprayed using a PTF4 type plasma gun (nozzle internal diameter 7 mm) with the internal injection of the powder 3 mm upstream of the nozzle exit. The arc current was 500 A and plasma forming gas mixture was 53 slm Ar and 7 slm H2. The coatings were sprayed on cast iron samples (diameter: 25 mm, thickness: 5 mm) located on a rotating substrate holder (110 mm diameter). The plasma torch was moved parallel to the holder axis. The substrates were preheated with the plasma gun and their surface temperature was controlled by air jets monitored by an IR monochromatic pyrometer. The coatings showed a uniform distribution of alumina in the steel matrix for two substrate preheating temperatures of 300 and 550° C. PB Begell House LK https://www.dl.begellhouse.com/journals/57d172397126f956,53ff946b54ebd0fc,75b76f4c4d24cb26.html