Pengaruh Variasi Campuran Bentonit Terhadap Karakteristik Pasir Cetak Untuk Proses Sand Casting

The casting process is widely used because it has the advantage of being able to make products with small dimensions very large dimensions, use materials more efficient, can be directly used. However, in process, main triggers for formation defects are nature mold, low permeability, molding compressive strength, sintering point, unsuitable sand grain distribution, so research needed obtain right type as a mold metal casting. only additive bentonite. Bentonite absorb water and expands between 8-15 times remains dispersed certain period time. This study aims examine effect mixture variations local bentonite Australian on characteristics process. tests carried out form size distribution testing, X-Ray Diffraction, content permeability measurements. was varied into 5 difference 20% each mixture. results silica grains were 37.6 GFN. XRD testing showed higher calcium compounds contained sodium compounds. largest test value 5.825%. strength 2.7 Kgf /cm 2 .