1994 Volume 12 Issue 2 Pages 186-191
The nickel based self-fluxing alloys (S.F.A.) have an important role in the field of pressure, wear and corrosion resistant coatings. These alloys are mainly sprayed using conventional flame spraying process. An additional post heat treatment of these coatings is necessary to achieve desired properties by density the coating and improving the substrate bonding. This technique is expected to be one of the effective methods for the surface treatment.
The slipping wear method was studied under atmospheric conditions for basic data, and the results were examined to see if the method was applicable to carbon steels. The material used in this study was mild steel (JIS type SS400) and bearing steel (JIS type SUJ2), and the material of the thermal spray was the self-fluxing alloy (S.F.A.). The size of ring type slipping wear specimen is 30 mm in outside diameter, 16 mm inside diameter and 8 mm in width. The constant of slipping facter is 9.09%. The contact load is 490 N and 980 N.
This report shows the mechanical and metallurgical properties of the sprayed self-fluxing alloy coating after abrasion test changed the combination of upper and lower specimen used the powder flame spraying.
The results are as follows :
(1) In either pressure load, the wear resistance sprayed S.F.A. specimen is better than another specimen.
(2) In the sprayed S.F.A. specimen, the abrasion loss of the lower specimen is bigger than the upper specimen.
(3) The quenched SUJ 2 specimen is a little abrasion loss compared S.F.A. coated specimen.
(4) The Vickers hardness of the substrate near the interface was changed from Hv 135 to Hv 250-500 after abrasion test.
(5) The microstructure of the substrate near sprayed S.F.A. coated were squeezed after abrasion test.
