Experimental Study of Phase Equilibria in the MnO-SiO2-“TiO2”-“Ti2O3” System
Experimental Study of Phase Equilibria in the MnO-SiO2-“TiO2”-“Ti2O3” System
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DOI：
10.2355/isijinternational.45.1543
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发表时间：
2005-11
影响因子：
1.8
通讯作者：
Youn‐Bae Kang;Hae-geon Lee
中科院分区：
文献类型：
--
作者：
Youn‐Bae Kang;Hae-geon Lee
本文研究了MnO-“TiO_2”-“TiO_2 O_3”系统在1300 - 1550 ℃温度范围内，在logpO_2（atm）-7.2（pCO/pCO_2 =1）--16.6（C-CO平衡）范围内的相平衡和液相线。采用高温平衡、淬火和电子探针分析（EPMA）等方法获得了液相和几种固溶体的平衡组成。已经观察到以下相：熔融氧化物，锰石（MnO（s.s.）），金红石（TiO 2-δ（s.s.）），尖晶石（Mn 2 TiO 4-MnTi 2 O 4）、焦磷铁矿（MnTiO 3-Ti 2 O3）和假板钛矿（“MnTi 2 O 5”-Ti 3 O 5）固溶体。测定了锰矿和金红石的液相线，并与前人的研究结果进行了比较。在MnO-“TiO 2”体系中，“MnTi 2 O 5”化合物是不稳定相。在本研究中发现，亚固相线相平衡受氧分压的影响很大。
Phase equilibria and liquidus in the system MnO-“TiO2”-“Ti2O3” under controlled atmosphere have been investigated in the temperature range from 1300 to 1550°C and in the range of log pO2 (in atm) from -7.2 (pCO/pCO2=1) to -16.6 (C-CO equilibration). High-temperature equilibration, quenching and electron probe microanalysis (EPMA) were employed to obtain equilibrium compositions of liquid and several solid solutions. The following phases have been observed; molten oxide, manganosite (MnO (s.s.)), rutile (TiO2-δ (s.s.)), spinel (Mn2TiO4-MnTi2O4), pyrophanite (MnTiO3-Ti2O3) and pseudobrookite (“MnTi2O5”-Ti3O5) solid solutions. Liquidus of manganosite and rutile were measured and compared with previous investigations. “MnTi2O5” compound was confirmed to be unstable phase in the MnO-“TiO2” system. It was found in the present study that sub-solidus phase equilibria are affected considerably by oxygen partial pressure.