Pelapisan Aluminium Pada Fe-Cr Dengan Teknik Evaporasi
Daftar Isi:
- Evaporation is one of coating methods to produce a thin layer conducted in a vaccum chamber. The thin layer formed by evaporation of a metal vapors originated from evaporation sources. The thin layer produced by this method has sufficiently good quality with low cost production. This research is carried out in a set of tools namely Evaporation Edward System E610 with a vaccum level reaching 10-5 mbar. Source of evaporation was an aluminium which was varied using different masses with 0,0216 grams; 0,0268 grams; 0,0319 grams; 0,0372 grams and 0,0424 grams. The substrate material was a carbon steel ST40 that has been previously electroplated using a chrome layer. After evaporated, the samples were heated by 200oC.The objective of this research was to determine the effect of the mass variations of Al which was followed by heat treatment process on the hardness and wear resistance. The XRD testing result showed that the layers with a mass of 0,0216 grams had an amorphous structure since its constituent atoms don’t have a specific arrangement pattern. While with the surface with a mass of 0,0424 grams showed a crystalline structure as given by its diffraction peaks. The result of hardness test showed that the sample deposited by a mass of aluminium with 0,0216 grams; 0,0268 grams; 0,0319 grams; 0,0372 grams and 0,0424 grams produced a hardness value 157,75 HVN; 163,75 HVN; 184,66 HVN; 198,94 HVN dan 215,86 HVN, respectively. While, the wear resistance of these similar mass variations produced a value the wear rate 1,678 x 10-4 mm2/kg; 1,547 x 10-4 mm2/kg; 1,505 x 10-4 mm2/kg; 1,343 x 10-4 mm2/kg dan 1,267 x 10-4 mm2/kg. These result indicate that there was a formation a new intermetallic compounds of Al-Cr that improved the properties of hardness and wear resistance. An increase of the mass of aluminium deposited on the Fe-Cr produced more Al-Cr intermetallic phases.