Kompaksi Terhadap Densitas Dan Kekerasan Pada Komposit W-Cu Untuk Proyektil Peluru Dengan Proses Metalurgi Serbuk
Submission Date: 2014-02-17 08:29:25
Accepted Date: 2014-03-15 00:00:00
Abstract
Dalam penggunaanya peluru memiliki beberapa bagian yaitu proyektil (bullet), kelongsong (bullet base), mesiu (propellant), dan pematik (rim). Proyektil menjadi penting karena proyektil adalah bagian yang menuju sasaran untuk menembus atau melumpuhkan. Bagian proyektil pada umumnya terbuat dari material yang berat jenisnya relatif tinggi, sehingga mampu menghasilkan peluru yang memiliki momentum yang besar dan jangkauan yang lebih jauh. Tungsten dipilih sebagai pengganti timbal karena tungsten memiliki densitas lebih besar dari timbal dan juga tidak memiliki sifat racun terhadap manusia. Proses pembuatannya melalui proses metalurgi serbuk dengan komposisi tembaga sebanyak 20, 30, 40 wt% dan tekanan kompaksi sebesar 200, 400, dan 600 MPa. Kemudian dilakukan sintering pada temperatur 900oC selama 1 jam. Hasil terbaik didapatkan pada W-20wt%Cu dengan nilai green density dan sinter density sebesar 12,09 g/cm3 dan 14,14 g/cm3 serta memiliki kekerasan, compressive strength, dan modulus elastisitas sebesar 32 HRB, 220,89 MPa dan 55,68 GPa
Keywords
proyektil; metalurgi serbuk; W-Cu
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