Proses pencampuran perlu dilakukan untuk mencegah terjadinya agglomeration sehingga dapat meningkatkan kualiatas dari produk crucible. Pencampuran adalah proses mencampurkan satu atau lebih bahan dengan menambahkan satu bahan ke bahan lainnya sehingga membuat suatu bentuk yang seragam. Oleh sebab itu, diperlukan suatu kajian untuk mengetahui pengaruh durasi pencampuran terhadap sifat mekanik pada material crucible yang dihasilkan. Spesimen crucible dibuat dengan mencampurkan semen tahan api, limbah evaporation boats, dan kaolin dengan komposisi tertentu. Proses pencampuran bahan dilakukan selama 30, 60 dan 90 menit dengan penambahan air sebanyak 15% dari total berat material. Proses kompaksi dilakukan dengan tekanan sebesar 40 kg/cm . Spesimen yang terbentuk didiamkan pada suhu 30°C selama 7 hari sebelum di sintering. Proses sintering dilakukan pada suhu 1000°C selama 2 jam menggunakan furnace untuk menghasilkan produk akhir. Proses karakterisasi pada penelitian ini menggunakan pengujian kekerasan dan foto makro. Hasil penelitian ini menunjukan spesimen dengan durasi mixing yang paling lama (90 menit) memiliki kekersan yang paling tinggi dikarenakan campuran bahan yang dihasilkan lebih homogen dibandingkan spesimen yang lain.
Evaporation boat waste contains Boron Nitride (BN) and Titanium Diboride (TiB2) so that it has electrically conductive properties with high resistance to chemicals and heat. In addition, the combination of these materials has high thermal conductivity properties with a melting point of up to 2700oC and has an oxidation resistance of up to 1000oC so it is very suitable if applied to crucibles, or refractory. The purpose of this study was to determine the effect of mixing duration on the hardness of the crucible material made from a mixture of evaporation boats waste, kaolin and fire mortar SK-34. The mixing process of evaporation boats waste, kaolin and refractory cement is carried out using a mixer machine with a duration of 30, 60 and 90 minutes. The compaction process was carried out on the mixture with a force of 40 kg/cm2 to produce a cylindrical test specimen. After seven days, the specimens were sintered at 1000oC for 2 hours. The hardness test process was carried out with the FM-800 microhardness tester machine to determine the effect of mixing duration on the final product hardness. The highest hardness of 37,2 HV was found in the final product with a mixing duration of 90 minutes. The hardness of final product is increasing with an increase in mixing duration.
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