Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF[Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique]
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Abstract
Micro structure and micro hardness characterizations have been done on NiCoCrAl coating deposited on different substrate, i..e, carbon steel, nickel chrome and hastealloy. NiCoCrAlY coating was deposited by high velocity oxy fuel (HVOF) thermal spraying technique. Characterization and measurents were applied on all cross section of the coating surfaces. Micro structural analysis was characterized by optical microscope with 40x magnification. Moreover, micro hardness tester was utilized to measure the hardness of the sample with 300 gf for 13 second. The hardness data was measured by calculating the average of 3 position of hardness measurement on substrate before coating, after coating and NiCoCrAl coating layer. According to micro structural analysis, it reveald that the thickness of NiCoCrAlYcoating layer was about 370.76 mm, 92 mm, dan 115.73 on carbon steel, nickel chrome and hastealloy substrate, respectively. Surface morfology showed that the coated layer was not flat and porous structure or void on the coated layer. The porosity of the coated layer might effect the mechanical properties of the sample where high procentase of porosity might reduce the hardness of the sample. The hardness of NiCoCrAlY coating was about 349.95, 315.60 and 311.30 HV for carbon steel, nickel chrome and hastealloy substrate, respectively. The distance from interface between coating layer and substrate might effect hardness measurement. More closer to interface could decrease hardness value and it might caused by interdiffusion of coating elements. Thus would be effect to its mechanical properties.
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