Influence of a ceramic dispersive phase on properties of composite nickel coatings
Anna Wyszyńska, Maria Trzaska Politechnika Warszawska, Wydział Inżynierii Materiałowej, ul. Wołoska 141, 02-507 Warszawa
Annals 4 No. 9, 2004 pages 94-98
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abstract The paper is aimed on investigations of the influence of two kinds of ceramic dispersive phases i.e. Si3N4 and Al2O3 on properties of composite nickel coatings manufactured by the method of chemical reduction. Investigations of the morphology and phase composition of Si3N4 and Al2O3 powders are performed (Figs 1 and 2). Results of morphological examinations of the coating surfaces Ni-P, Ni-P-Si3N4 and Ni-P-Al2O3 are shown in Figure 3. Structures in cross sections of the composite coatings are shown in Figure 4. Effects of examinations of the wear resistance and hardness of the S235JR substrate and Ni-P, Ni-P-Si3N4 as well as Ni-P-Al2O3 coatings are reported (Fig. 5 and Tab. 1). Results of performed investigations of Ni-P- -Si3N4 coatings are compared with results of similar examinations of Ni-P-Al2O3 surface deposits. Results of investigations presented in this paper have showed that introducing ceramic phases into Ni-P coatings leads to important increase in wear resistance and hardness of the ceramic dispersive phase has influences on mechanical properties of the composite surface coatings. Key words: composite coatings, silikon nitride, aluminium oxide, hardness, abrasion properties