Phase separation in melts of the ZrO<Subscript>2</Subscript>-Al<Subscript>2</Subscript>O<Subscript>3</Subscript> system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Phase separation in melts of the ZrO2-Al2O3 system

Authors:	Yu. P. Udalov D. V. Grishchenko V. V. Kulakov I. V. Poznyak A. Yu. Pechenkov

Affiliation:	(1) St. Petersburg State Institute of Technology, Technical University, Moskovskii pr. 26, St. Petersburg, 198013, Russia;(2) St. Petersburg State University of Electrical Engineering, ul. Professora Popova 5, St. Petersburg, 197376, Russia

Abstract:	The morphology of the quenched and slowly crystallized samples in the ZrO₂-Al₂O₃ system is investigated in the composition range 25–70 wt % ZrO₂. It is revealed that, irrespective of the cooling rate, the samples contain large baddeleyite (or corundum) crystals, eutectic mixtures, and characteristic regions of intergrown elongated baddeleyite and corundum grains with micron sizes. These regions have the same phase composition at any initial ratio between zirconium and aluminum oxides and at any cooling rates of the melt. A hypothesis is put forward that these regions are products of the decomposition of ZrO₂ · 2Al₂O₃ associates.

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