Crystallization of Eutectic Structures in the LaB6-W2B5-NbB2 System

被引：0
作者：
Nesmelov, D. D. [1 ]
Novoselov, E. S. [1 ]
Vikhman, S. V. [1 ]
机构：
[1] Tech Univ, St Petersburg State Technol Inst, St Petersburg 190013, Russia
来源：
GLASS PHYSICS AND CHEMISTRY | 2022年 / 48卷 / 01期
基金：
俄罗斯科学基金会;
关键词：
lanthanum hexaboride; tungsten boride; niobium diboride; solid solution; eutectics; melt; crystallization; ceramics; MECHANICAL-PROPERTIES; THERMIONIC EMISSION; PHASE-RELATIONS; BORIDE; MICROSTRUCTURE; FABRICATION; COMPOSITES; STRENGTH; BEHAVIOR;
D O I：
10.1134/S1087659622010096
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Crystallized alloys in the LaB6-W2B5-NbB2 system are obtained by melting in an electric arc discharge and rapid cooling in an inert gas (Ar) flow. The characteristic eutectic structures of the lamellar and rod types are investigated using scanning electron microscopy. Using X-ray phase and X-ray structural analysis, it is found that the phase composition of crystallized objects is represented by lanthanum hexaboride, an alpha-solid solution (WxNb1- x)(2)B-5 and beta-solid solution (NbxW1- x)B-2. An assumption is made about the existence of a ternary phase in the Nb-W-B system, which is close to the composition of Nb0.5W0.5B4. The concentrations of the components in the eutectic regions are determined by the methods of X-ray spectral microanalysis and statistical analysis of the area of the phase components.
引用
收藏
页码：23 / 29
页数：7
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