Permintaan energi yang terus tumbuh dan masalah pemanasan global memaksa untuk mencari sumber energi berkelanjutan, termoelektrik menawarkan energi berkelanjutan. Metode yang dilakukan untuk membuat material termoelektrik adalah metalurgi serbuk dengan tahapan proses mixing, kompaksi dan sintering. Penelitian ini bertujuan untuk mengetahui pengaruh variasi komposisi kimia terhadap sifat termoelektrik dan mekanik. Bahan yang digunakan adalah paduan Zn-Al yang mempunyai variasi komposisi Al 1%, 3% dan 5%, dengan penimbangan berat sampel 1,5 gram. Kompaksi dilakukan dengan penekanan 80 kg/cm<sup>2 </sup>dan proses sintering pada temperatur 360ºC. Selanjutnya material dikarakterisasi diperoleh nilai densitas Archimedes tertinggi didapatkan pada variasi komposisi dengan doping 5%Al sebesar 6.6376 g/mm<sup>3</sup> dan nilai kekerasan sebesar 80,69 HVN. Hasil dari pengujian Termoelektrik (LSR-4) nilai koefisien Seebeck sebesar 1,794 μV/K dan Power factor sebesar 1,619x10-5 W/mK<sup>2</sup> pada temperatur 400 K, hasil tersebut lebih besar dibandingkan doping Al 1% dan 3%. Hasil dari pengujian koefisien Seebeck tersebut meunjukkan material Zn-Al mempunyai tipe-p atau dominan hole. Dengan penambahan doping Al pada Zn secara efisien mengimbangi penurunan dalam konsentrasi untuk peningkatan konduktivitas listrik dan sifat-sifat Zinc sebagai konduktor serta bahan termoelektrik.
SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION. Radar (Radio Detection and Ranging) is a technology using the principle of electromagnetic for detecting, measuring, and mapping target coordinates. So stealth technology was created to tackle these threats, one of which is the radar absorber coating method (RAC). This research aims to identify the effect addition of Cu to Fe-Nd-B radar absorber material as polymer matrix composite (PMC). The processes were done by powder metallurgy method, started by milling and mechanical alloying process using planetary ball mill for 60 minutes 1000 rpm, 25 kg/mm2 of compaction load, and sintering at the temperature 1000 oC for 3 hours. The coating process was carried out conventional method as much as 1 layer, the variation of resin and magnetic powder are (95:5), (90:10), and (85:5) with the addition of Cu 1%wt. Based on the characterization the lowest RL was obtained at the composition (85:15) with the value 32.08 dB at the frequency of 10.36 GHz, magnetic characterization after doping addition coercivity 0.096 kOe and Saturation 5.22 kG. PMC hardness was raising following to addition of magnetic powder with the 29.2 HD Shore D, and adhesivity value was decreased following to addition of magnetic powder to 0.5 MPa.
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