Size Dependent Thermal Expansion Coefficient of Rod-Shaped Oxide Eutectic Ceramic
Size Dependent Thermal Expansion Coefficient of Rod-Shaped Oxide Eutectic Ceramic
复制标题
棒状氧化物共晶陶瓷的尺寸相关热膨胀系数
DOI：
10.4028/www.scientific.net/amr.105-106.146
复制
发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
李宝峰
中科院分区：
文献类型：
--
作者：
钟国辉;倪新华;李宝峰
采用自蔓延高温合成工艺制备的棒状氧化物共晶陶瓷具有优异的力学性能。首先，采用四相模型方法研究了含中间相纳米纤维制备的棒状氧化物共晶陶瓷的有效扰动应变，得到了棒状氧化物共晶陶瓷的平均应变引起的热不一致性。平均应变决定了棒状氧化物共晶陶瓷的有效热膨胀应变，即纵向应变和横向应变。棒状氧化物共晶陶瓷是横向各向同性的，具有两个独立的热膨胀系数。结果表明，棒状氧化物共晶陶瓷的热膨胀系数与纳米纤维的直径有关。随着纳米纤维直径的减小，热膨胀系数减小。
Rod-shaped oxide eutectic ceramics fabricated through SHS process can acquire outstanding mechanical properties. First, Four-phase model method was used to study effective disturbance strain of rod-shaped oxide eutectic ceramics produced by nano fibers with inter-phases, then average strain of rod-shaped oxide eutectic ceramics aroused thermal inconsistency is obtained. The effective thermal expansion longitudinal strain and transverse strain of rod-shaped oxide eutectic ceramics are determined by the average strain. Rod-shaped oxide eutectic ceramics is transverse isotropy and has two independent thermal expansion coefficients. The results show that the thermal expansion coefficients of rod shaped oxide eutectic ceramics are dependent on the diameter of nano-fiber. The thermal expansion coefficients will decrease when the diameter of nano-fiber decrease.