Effects of milling and subsequent heat treatment on preparation of mullite–zirconia nanocomposites

Micro & nano letters

article

Somaye Ghaffari¹  Masoud Alizadeh¹  Keivan Asadian¹  Touradj Ebadzadeh¹  Arezoo Ghanbari¹ 

[1] Ceramic Division, Materials and Energy Research Center

关键词: aluminium compounds;    fracture toughness;    hardness;    heat treatment;    milling;    nanocomposites;    nanofabrication;    nanoparticles;    porosity;    sintering;    X-ray diffraction;    zirconium compounds;    milling;    heat treatment;    mullite-zirconia nanocomposites;    reaction sintering;    mechanically activated alumina;    zircon powder mixtures;    X-ray diffraction;    physical properties;    mechanical properties;    porosity;    hardness;    fracture toughness;    time 70 h;    temperature 1200 degC;    temperature 1500 degC;    Al6Si2O13-ZrO2;   

DOI  :  10.1049/mnl.2013.0008

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Mullite–zirconia composites were fabricated through reaction sintering of mechanically activated alumina and zircon powder mixtures. X-ray diffraction results showed that increasing milling time resulted in gradual weakening and broadening of alumina and zircon peaks. For the sample milled for 70 h in which there are no peaks present from zircon, heating at 1200°C resulted in the reappearance of the zircon peaks. Samples sintered at 1500°C achieved complete formation of mullite and zirconia. These samples exhibited the following physical and mechanical properties: density 3.87 g/cm 3 , open porosity 3.45%, hardness 11.44 ± 0.3 GPa and fracture toughness 4.7 Mpam 1/2 .

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND