Pembuatan dan Karakterisasi Keramik Berpori dari Campuran Zeolit dan Bahan Aditif Arang Sekam Padi dengan Perekat Polivinylalcohol (PVA)

Abstract

The phorous ceramics based on zeolite and ash of hush of paddies had been fabricated and characterized. Both substances were pulverized and sieved with a 100 mesh. The variations of composition were 100:0, 90:10, 80:20, 70:30, 60:40, and 50:50 ( in % mass dough). Each dough was added 50 ml of PVA as a glue, pressed at 25 Kgf/cm² and sintered for 5 minutes, then dried within an oven at 60 °C for 24 hours. Based on results, it was found that best phorous ceramics based on zeolite and ash of hush of paddies with composition of 70 % of zeolite and 30 % of ash of hush of paddies under the temperature sintering of 1000 °C. With this composition, some physical properties were characterized as following: density of 1,91 g/cm³, porosity of 43,69 %, lessened burn of 21,12 %, bending strength of 13,65 MPa, compressive strength of 13,79 Mpa and thermal expansion coefficient (α) of 5 x 10-6°C-1. The phorous ceramics based on zeolite and ash of hush of paddies has a major phase of mullite ( orthorhombic crystalline structure ) and a minor phase of trydimite ( monoclinic crystalline structure ) according to XRD analysis. Based on the SEM analysis, phorous ceramics based on zeolite and ash of hush of paddies has uneven surface of particle distribution with the size of 1 – 10 μm