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Grain Growth of α‐SiAlON in the Calcium‐Doped System
Author(s) -
Li YaWen,
Wang PeiLing,
Chen WeiWu,
Cheng YiBing,
Yan DongSheng
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00493.x
Subject(s) - sialon , grain growth , materials science , sintering , doping , phase (matter) , mineralogy , grain size , hot pressing , chemical engineering , analytical chemistry (journal) , metallurgy , crystallography , chemistry , optoelectronics , organic chemistry , chromatography , engineering
Two calcium‐doped α‐SiAlON compositions (Ca 0.6 Si 10.2 Al 1.8− O 0.6 N 15.4 and Ca 1.8 Si 6.6 Al 5.4 O 1.8 N 14.2 ) were prepared by hot pressing at 1600° and 1500°C, respectively, for complete phase transformation from α‐Si 3 N 4 to α‐SiAlON. Both samples were subsequently fired at different temperatures for different periods of time to study the grain growth of α‐SiAlON. Elongated α‐SiAlON grains were developed in both samples at high temperatures. The kinetics of grain growth was investigated based on the variations in length and width of the α‐SiAlON grains under different sintering conditions. Different growth rates were found between the length and width directions of the α‐SiAlON crystals, resulting in anisotropic grain growth in the microstructural development.