Correlation between Grain Size and Thermal Expansion for Aluminum Titanate Materials
Correlation between Grain Size and Thermal Expansion for Aluminum Titanate Materials
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DOI：
10.1111/j.1151-2916.1989.tb06091.x
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发表时间：
1989-12
影响因子：
3.9
通讯作者：
F. Parker;R. Rice
中科院分区：
文献类型：
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作者：
F. Parker;R. Rice
在不同条件下烧结Al2TiO5材料，得到不同的晶粒尺寸。所得到的微裂纹材料表现出一系列与平均晶粒尺寸密切相关的体积热膨胀。当Al2TiO5平均晶粒尺寸为3 ~ 4 μm时，微裂纹的尺寸和数量可以有效地降低多晶材料的表观热膨胀。晶粒尺寸的进一步增大导致体热膨胀迅速下降，随后随着晶粒尺寸的进一步增大而减小。在莫来石-钛酸铝复合材料中添加少量的相稳定剂（MgO或Fe2O3 <2.1 wt%）或有限的莫来石对这种相关性没有显著影响。
Al2TiO5 materials were sintered under different conditions to produce different grain sizes. The resultant microcracked materials exhibited a range of bulk thermal expansions which showed a strong correlation with average grain size. An Al2TiO5 average grain size of 3 to 4 μm was the minimum at which the size and population of microcracks effectively reduced the apparent thermal expansion of the polycrystalline material. Further increases in grain size resulted in a rapid drop in the bulk thermal expansion, followed by diminishing decreases with further increases in grain size. Small amounts of phase stabilizers (<2.1 wt% MgO or Fe2O3) or limited mullite additions in mullite—aluminum titanate composites had no significant effect on this correlation.