Influence of gamma irradiation to the magneto-impedance ratio of the electrodeposited [NiFe/Cu]4 multilayer on meander-shape PCB substrate has been studied. The magneto-impedance ratios were measured for both un-irradiated and irradiated by gamma radiation of Co-60 with a total dose of 40 Gy. The morphological structure were done by using scanning electron microscopy (SEM). The decrease in grain size of the samples after Gamma irradiated is observed. The magnetic property modifies as consequence of the change in the microstructure samples. Within result, the magneto-impedance ratio decreases around 34.9% for irradiated sample.
Weaknesses of local disc brakes are cover several conditions such as low hardness, wear, and corrosion resistance. To improve this weakness, it is necessary to modify the surface properties of the material. The aim of this research is to study the influences of nitrogen ion implantation on the surface properties of a disc brake material. The implantation process was carried out for various of ions dose such as 3.107×10 16 ions/cm 2 , 3.148×10 16 ions/cm 2 , 3.728×10 16 ions/cm 2 , 4.039×10 16 ions/cm 2 , 4.350×10 16 ions/cm 2 at a certain energy and beam current of 60×10 16 ions/cm 2 , 30 µA respectively. Hardness and wear properties were tested using microhardness tester and wear testing machine, respectively. Meanwhile, the crystalline structure for un-implanted (raw) and implanted materials at the optimum dose was analyzed using XRD. From the hardness test results, it can be obtained that the hardness of raw material is 59.82 VHN and after implantation it reached the highest value of 109.78 VHN or increases by factor 83%, while the wear test results is 22.9×10-9 mm 2 /kg for raw material and after implantation it reaches the highest value of 2.5×10-9 cm 2 /kg or decreases by factor 88%. These conditions were obtained at 3.728×10 16 ions/cm 2 of dose. Based on the XRD analysis, 45.5% Fe 2 N and 54.55% Fe 3 N compounds are formed.
Nickel chromium oxide (NiCrO) deposition has been carried out on a glass substrate with a variation of the Argon / oxygen (Ar:O) gas ratio using DC sputtering. The purpose of this study is to determine the effect of the Ar: O gas ratio on the energy gap of the NiCrO layer. NiCrO thin film deposition was carried out using a variation ratio of Argon gas and oxygen 60:40, 70:30, 80:20, and 90:10. To determine the phase formed was analyzed using X-Ray Diffraction (XRD). UV-Vis spectrophotometer test was carried out to determine the transmittance value (% T), then from this data, it can be used to calculate the gap energy. Based on the results of the variation of the gas ratio obtained the largest energy gap of 3.44 eV on the gas ratio variation of 80:20.
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