Penggunaan material komposit sebagai material alternatif saat ini semakin berkembang, selain itu limbah dari limbah berupa plastik dan kayu semakin meningkat dan cenderung merusak lingkungan. Pada penelitian ini, pembuatan dan analisis komposit dari limbah plastik PP (Polypropylene) dan serbuk kayu durian akan mengetahui pengaruh komposisi kedua paduan tersebut terhadap sifat mekanik. Metode dua paduan dengan 20/80, 30/70, dan 40/60 pada tekanan 20 kg/cm2 selama 20 menit dengan pengujian Impak Charpy, Pengujian Kekerasan, dan pengamatan struktur makro pada patahan.

Pada penelitian ini dilakukan pembuatan metal matrix composite dari bahan serbuk tembaga murni yang akan dipadu dengan bahan penguat berupa serbuk grafit yang dilanjutkan dengan pengujian pada mesin EDM. Metode pencampuran kedua material ini dilakukan dengan proses Powder metalurgi melalui tahapan pencampuran (mixing), penekanan (compaction) dan dilanjutkan dengan proses pemanasan dengan suhu 800 oC(sintering). Pada penelitian ini ingin diketahui pengaruh tekanan akibat proses powder metalurgi terhadap laju keausan material (MRR) dan laju keausan elektroda (ERR) pada material baja ST.37 mesin EDM Chimer EZ Dengan parameter pemakan tetap, arus 2 Amper dan kedalaman 5 mm. Pengujian yang dilakukan yaitu kekerasan dan struktur mikro. Dari hasil penelitian ini menunjukkan dengan semakin meningkatnya tekanan kompaksi laju keausan material MRR dan kekerasan semakin meningkat, sementara laju keausan terendahi terjadi pada tekanan kompaksi 25.000 KN

This study aims to obtain information about the price of tensile, hardening, and changes in microstructure as well as changes in material properties at hot temperature variations 800 O C to 900 O C. The method used in this study is an experimental method, where the material used is ST-60 steel bolts, with a tensile test sample form referring to the ASTM D 638-03 standard, while for testing hardness and chemical composition based on machine standards, namely Ø16 mm x 20 mm. In this study, 5 samples were made at each temperature of 0 0 C, 800 0 C, 850 0 C, 900 0 C, 950 0 C and 1000 0 C with the type of heat treatment in the normalizing process and the hardening quenching process. This research was conducted in the Laboratorium Pengujian Bahan, Jurusan Teknik Mesin, Politeknik Negeri Pontianak. The test results on the normalizing process for tensile strength decreased by an average of 230.78 N/mm 2 or 50%, Vickers hardness decreased by an average of 33.99 HV or 31% and the carbon content decreased by an average of 0.19 or 48% of the normalizing process is not done. Whereas in the hardening quenching process, the average tensile strength increased by 93.22 N/mm 2 or 20 %, the Vickers hardness on average increased by 19.29 HV or 18 % and the average carbon content increased by 0.06 or up 17 % of the hardening quenching process was not done. So to overcome the decrease in mechanical strength and changes in the microstructure of the ST-60 bolt due to hot temperatures, the hardening quenching process can be applied, namely by polishing with used oil after the bolts work at hot temperatures.

To increase the hardness and wear resistance of low carbon steels (low carbon steel), it is usually done by a hardening process, namely by adding carbon elements. One of these processes is by using the Pack carburizing method. In this study, the pack carburizing process will be carried out on low carbon steel St 37 using activated charcoal media from ironwood combined with ale-ale shells catalyst with a composition of 10%, 20%, 30% 40% and 50%. Furthermore, composition testing and hardness testing were carried out using the Vickers method. The results of this study in the composition test, there was an addition of carbon due to diffusion and an increase in the maximum hardness of the catalyst composition by 30% with a hardness of 572.6 VHN.