mM Wards the 
Ing this Method 
Tie fg content were performed. The development of a suitable age hardening recipe for AICuSiMn and the 
mechanical tests will be performed during a later stage of the project. 
£ material Since 
A Darticles are 
VA is, 4 Results and discussion 
Sy ads 19 
. Interlamellar Samo] | 
0 lame ample preparation 
4nd inclusions Standard grit-blasting did not prove to be suitable for foams: The foaming skin was destroyed 
) may lower the locally and pores were opened. Coating of these pores resulted in poor surface quality since bigger 
Properties can pores could not be closed. Therefore the foams were cleaned and roughened using sandpaper. 
2¢ particles and Samples with this preparation were coated successfully. Alternative preparation methods will have 
£56 transport to be investigated during further research activities. 
STN raving 
eS, very high Coating 
0 Wh thy of The foams could be coated adjusting the spraying parameters for foams (fig 3). The positive effect 
Since {he spray of nitrogen instead of compressed air was evident especially in the case of NiAl5: The oxygen 
content was reduced by 60% down to 1,35 wt-% diminishing the amount of brittle oxide phases; the 
microhardness amounted to 175 HV0,3/15 for samples sprayed with compressed air, 167 HV0,3/15 
using nitrogen. In the case of AICuSiMn the positive effect was less pronounced (reduction of appr. 
10% down to 0,9 wt-% oxygen). This is due to the fact that molten aluminium droplets are protected 
by a thin aluminiumoxide layer even during the flight. The microhardnesses 
|] AICuSiMn, electric arc sprayed RE 
(with N,) onto Al 6060 
8” 
Zw 
3 
3 
3 L. 0 Tl eo kw 180 
Substrattemperatur [°C] 
Fig. 3: Foam with NiAlS (IN,) coatine Fig. 4: Adhesion of arc sprayed AICuSiMn 
> outed using 2 were 101 HV0,3/15 (compr. air) and 107 HV0,3/15 (N3). The increased hardness of the nitrogen- 
density‘ Dim Of sprayed coatings was probably due to a 50% higher nitrogen content: 0,15 wt-% compared to 0,99 
50-200 um. The wt-% in the air-sprayed samples. The adhesion of the coatings was tested in tension for AICuSiMn 
SM is an age on Al6060 bulk material (DIN EN 582). Not preheating the substrate lead to high residual stresses 
to the formation and an insufficient bonding: the.coating delaminated at 7 MPa (+/- 3 MPa); preheating led to 
ed. The quality significant improvements: 30 (+/-4) MPa at 120°C, 43 (+/-6) MPa at 160°C (fig 4). Presently 
nd roughened by available metal foams have a compressive strength below 15 MPa so that it can be expected that 
yf cross Sections preheated metal foams will not fail due to an insufficient bonding. 
mine the OXVEEM 
Metallograph 
Cross sections of the specimens were cut using a commercial high precision cutting device. To 
avoid excessive deformation the specimen was first cut into a manageable size, then infiltrated with 
337