Apparent activation energy for densification of �?-Al2O3 powder at constant heating-rate sintering

Bulletin of materials science

H S Cao²  D Li²  S O Chen¹  S S Zhang²  Y C Zhang²  W Q Shao² 

[1] College of Physics Science, Qingdao University, Qingdao 266071, P.R. China$$Laboratory of Fibre Materials and Modern Textile, Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, P.R. China$$College of Physics Science, Qingdao University, Qingdao 266071, P.R. ChinaCollege of Physics Science, Qingdao University, Qingdao 266071, P.R. China$$Laboratory of Fibre Materials and Modern Textile, Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, P.R. China$$Laboratory of Fibre Materials and Modern Textile, Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, P.R. ChinaCollege of Physics Science, Qingdao University, Qingdao 266071, P.R. China$$Laboratory of Fibre Materials and Modern Textile, Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, P.R. China$$;College of Physics Science, Qingdao University, Qingdao 266071, P.R. China$$College of Physics Science, Qingdao University, Qingdao 266071, P.R. ChinaCollege of Physics Science, Qingdao University, Qingdao 266071, P.R. China$$

关键词: Apparent activation energy;    Arrhenius theory;    constant heating-rate sintering;    ð›�?-Al2O3.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The apparent activation energy for densification is a characteristic quantity that elucidates the fundamental diffusion mechanisms during the sintering process. Based on the Arrhenius theory, the activation energy for densification of ð›�?-Al₂O₃ at constant heating-rates sintering has been estimated. Sintering of ð›�?-Al₂O₃ powder has been executed by the way of a push rod type dilatometer. It is shown that the apparent activation energy does not have a single value but depends directly on the relative density. The apparent activation energy corresponding to lower relative density was higher than that corresponding to higher relative density. In addition, the value of the evaluated activation energy is different at the same density level when the Arrhenius plot involves different heating rates.

【 授权许可】

Unknown