ZrO2-Al2O3 eutectic plates produced by laser zone melting
ZrO2-Al2O3 eutectic plates produced by laser zone melting
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DOI：
10.1016/s0955-2219(01)00279-5
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发表时间：
2002-02-01
影响因子：
5.7
通讯作者：
Orera, VM
中科院分区：
文献类型：
--
作者：
Larrea, A;de la Fuente, GF;Orera, VM
本文描述了一种制备大表面共晶复合材料的程序，该共晶复合材料由熔体定向凝固，具有非常精细和均匀的微观结构。 Al2O3-ZrO2 共晶大表面板。厚度高达 250 微米，采用适用于制备大面积样品的改进激光区域熔化方法进行凝固生长。使用 20x0.5 mm(2) 尺寸的矩形 CO2 激光束扫描陶瓷前体的表面，从而引起表面熔化。所得的微观结构是无集落的，由精细且交替的 Al2O3 和 ZrO2 单晶片层组成。这种微观结构是改善加工材料机械性能的基础。相间的间距、晶体结构和取向关系已经确定。研究了凝固前沿作为加工条件的函数。还使用微发光技术沿横向板截面绘制了残余应力的图。 (C) 2001 Elsevier Science Ltd，保留所有权利。
This paper describes a procedure for preparing large surfaces of eutectic composites directionally solidified from the melt, with very fine and uniform microstructures. Large surface plates of the Al2O3-ZrO2 eutectic. with thickness up to 250 tm, have been grown by solidification using a modified laser zone melting method suitable for the preparation of large area samples. The surface of a ceramic precursor is scanned with a rectangular CO2 laser beam of 20x0.5 mm(2) size which induces surface melting. The resulting microstructure is colony free and it consists of fine and alternating interpenetrating Al2O3 and ZrO2 single crystal lamellae. This microstructure is the basis for improvement of mechanical behaviour in the processed material. The interspacing, crystal structure and orientation relationship between the phases has been determined. Solidification fronts were studied as a function of the processing conditions. A mapping of the residual stresses has also been performed along the transverse plate sections using micro-luminescence techniques. (C) 2001 Elsevier Science Ltd, All rights reserved.