#TITLE_ALTERNATIVE#

• Main Author: WIDIGDYA DEWANTO (NIM : 13707034); Pembimbing : Dr. Ir. Aditianto Ramelan , SUNU
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17331
• Institution: Institut Teknologi Bandung

Alumina (Al2O3) ceramic is one of ceramics which has some superior properties, such as high temperature resistance, corrosion resistance, and high hardness. Alumina ceramic is widely used, such as spark plug, insulator material, crucible, ballistic armor and bioceramic. In the manufacturing process of alumina ceramic material, firing shrinkage will affect the dimension of the product. Firing shrinkage will be the parameter that occurs at the densification level of alumina ceramic products. The addition of additives in alumina ceramic processing was performed to modify the properties of alumina. The addition of titania (TiO2) additives was reported to increase shrinkage, hence faster densification occured. Therefore, the addition of TiO2 additives can produce a higher product density and lower sintering temperature that increased the hardness, whereas the addition of chromia (Cr2O3) was reported to improve fracture toughness. In this study, alumina ceramic is made with the addition of TiO2 and Cr2O3 additives with the composition variation of 1, 3 and 5 w/o by using the method of powder pressing. The sintering process was carried out up to 1550oC and 1750oC. Characterization of specimen was done by measuring the shrinkage, hardness, calculating the value of fracture toughness, and fractography observation by using SEM JEOL JSM-6360LA. The addition of TiO2 with composition 1, 3 and 5 w/o increase firing shrinkage alumina ceramic at the sintering temperature 1550oC, while the addition of Cr2O3 does not affect the shrinkage of alumina. With the same firing shrinkage, the addition of TiO2 can lowered the sintering temperature up to 1550oC. Maximum hardness 1251 VHN is achieved in alumina ceramic with addition of TiO2 1 w/o. Alumina with the addition of Cr2O3 1 w/o increase the fracture toughness up to 5.08 MPa.m1/2 at firing temperature of 1750oC. Further research on the effect of additives in alumina ceramic is still required.