Dependence of the Fracture Toughness on the Sintering Time of Dense Hydroxyapatite Bioceramics
Fracture toughness dependence of sintered hydroxyapatite (HA) bioceramics on the sintering time was studied.The nanocrystalline and highly pure Hydroxyapatite powders produced by wet chemical precipitation method were used as starting material.After uniaxial and cold isostatic pressing,the green HA samples sintered at temperatures ranging from 1000 ℃ to 1300 ℃ with different sintering time.Dense compacts with grain sizes in the nanometer to micrometer range were processed.The average grain size of HA compact sintered at 1000 ℃ was around 500 nm.Grain size increased to 3 μm when the compacts were sintered at higher temperature.The average microhardness value of sintered HA decreased with an increased in grain size.Indentation fracture toughness for HA compacts of 700 nm grain size was 1.41±0.4 MPa.m1/2 which is similar to fracture toughness of human cortical bone.
Hydroxyapatite Bioceramics Fracture Toughness Sintering
Ranna Tolouei Ramesh Singh lis Sopyan Tan Chou Yong Mahdi Amiriyan Teng Wan Dung
Ceramics Technology Laboratory,University Tenaga Nasional,Kajang,Selangor,Malaysia Centre of Advanced Manufacturing & Materials Processing(AMMP),Department of Engineering Design and M Department of Manufacturing and Materials Engineering,Faculty of Engineering,International Islamic U Ceramics Technology Group,SIRIM Berhad,40911 Shah Alam,Selangor,Malaysia
国际会议
大理
英文
391-395
2011-08-18（万方平台首次上网日期，不代表论文的发表时间）