The effects of Cr2O3 addition on microstructure and fracture toughness Of ZTA ceramic composite
Abstract
Abstract
The microstructure and mechanical properties of ceramic composites produced from alumina, yttria stabilized zirconia and chromia oxide system was investigated. The Cr2O3 weight percent was varied from 0 wt% to 1.0 wt%. Each batch of composition was mixed, uniaxially pressed to 13mm diameter and sintered at 1600 ◦C for 4 h in pressureless conditions. Studies on the effects of the sample microstructures on their mechanical and physical properties such as fracture toughness and bulk density were carried out. Results show that an addition of 0.6 wt% of Cr2O3 produces the best mechanical properties. Furthermore, microstructural observations show that the Al2O3 grain size is significantly dependent on the amount of Cr2O3 additives used. Maximum value obtained with 0.6 wt % Cr2O3 for the fracture toughness is 5.36 MPa.m1/2.
ABSTRAK
Mikrostruktur dan ciri-ciri mekanikal komposit seramik dihasilkan dari alumia, zirkonia distabilkan yttria dan kromia telah di siasat. Berat peratus kromia dibezakan dari 0 % berat ke 1.0 % berat. Setiap kumpulan komposisi dicampur dan ditekan secara hidraulik kepada pellet berdiameter 13mm dan disinter pada 1600 oC selama 4 jam dalam keadaaan tanpa tekanan. Kajian terhadap kesan mikrostrutur terharap sifat mekanikal dan fizikal seperti keliatan patah dan ketumpatan pukal dijalankan. Keputusan menunjukkan penambahan sebanyak 0.6 % berat Cr2O3 menghasilkan sifat mekanikal terbaik. Tambahan pula, pemerhatian terhadap mikrostruktur menunjukkan saiz butir Al2O3 adalah sangat bergantung kepada amaun tambahan Cr2O3 yang digunakan. Keputusan tertinggi dihasilkan oleh 0.6 % berat Cr2O3 untuk keliatan patah ialah 5.36 MPa.m1/2.
