Synthesis, densification and oxidation study of lanthanum hexaboride

被引：55

作者：

Sonber, J. K. ^{[1
]}

Sairam, K. ^{[1
]}

Murthy, T. S. R. Ch. ^{[1
]}

Nagaraj, A. ^{[2
]}

Subramanian, C. ^{[1
]}

Hubli, R. C. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Mat Proc Div, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Laser & Plasma Technol Div, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2014年 / 34卷 / 05期

关键词：

LaB6; Synthesis; Densification; Rare earth boride; Oxidation; LAB6; NANOWIRES; NANOPARTICLES; MECHANISM; CRYSTALS; POWDER; ROUTE;

D O I：

10.1016/j.jeurceramsoc.2013.11.023

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：

This paper presents the result of investigation carried out on the synthesis, densification and oxidation studies of LaB6. LaB6 was synthesized by boron carbide reduction of La2O3. Effect of temperature on product quality was investigated. Pure LaB6 powder was obtained at 1500 degrees C, in vacuum. Pressureless sintering at 1950 degrees C of LaB6 powder resulted in a density of only 85.1% of the theoretical value. Hot pressing resulted in near theoretical density at the same operating temperature. Hardness and fracture toughness of the dense LaB6 was measured as 20 GPa and 3.02 MPa m(1/2) respectively. Oxidation study by thermogravimetry revealed that oxidation starts slowly at 500 degrees C and accelerates at 700 degrees C. Isothermal oxidation study revealed that protective oxide layer forms on LaB6 surface on oxidation at 900 degrees C. The presence of protective continuous oxide layer on the surface was observed even after 64 h exposure in air atmosphere. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：1155 / 1160

页数：6

共 50 条

[41] CHARACTERISTICS OF CONDUCTION ELECTRONS IN LANTHANUM HEXABORIDE
IVANCHENKO, LA
PADERNO, YB
PILYANKEVICH, AN
BEKENEV, VL
KOVALCHUK, VV
ONIPKO, AF
PEREPELITSA, NI
SICHKAR, VV
CHERNENKO, LI
INORGANIC MATERIALS, 1980, 16 (09) : 1056 - 1059
[42] Experiences with lanthanum hexaboride cathode guns
Rosander, S
Wernholm, O
PHYSICA SCRIPTA, 1997, T71 : 157 - 160
[43] DIRECTLY HEATED LANTHANUM HEXABORIDE CATHODE
LEUNG, KN
MOUSSA, D
WILDE, SB
REVIEW OF SCIENTIFIC INSTRUMENTS, 1986, 57 (07): : 1274 - 1276
[44] INVESTIGATION OF HIGH-TEMPERATURE OXIDATION OF LANTHANUM HEXABORIDE IN OXYGEN AND EFFECT OF INTERNAL OXIDATION ON PROTECTIVE PROPERTIES OF SCALE
LAVRENKO, VA
GLEBOV, LA
LUGOVSKA.YS
FRANTSEV.IN
OXIDATION OF METALS, 1973, 7 (02): : 131 - 139
[45] Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study
Mattox, Tracy M.
Groome, Chloe
Doran, Andrew
Beavers, Christine M.
Urban, Jeffrey J.
JOURNAL OF CRYSTAL GROWTH, 2018, 486 : 60 - 65
[46] Synthesis of nanostructured lanthanum hexaboride via simple borothermal routes at low temperatures
Hasan, Muhammad M.
Kisi, Erich
Sugo, Heber
CERAMICS INTERNATIONAL, 2021, 47 (20) : 29295 - 29302
[47] ANALYTICAL AND STRUCTURAL-ANALYSIS OF THE LANTHANUM-DEFICIENT LANTHANUM HEXABORIDE
MCKELVY, MJ
EYRING, L
STORMS, EK
JOURNAL OF PHYSICAL CHEMISTRY, 1984, 88 (09): : 1785 - 1790
[48] IMPROVED CATAPHORETIC DEPOSITION METHODS FOR LANTHANUM HEXABORIDE
DELMORE, JE
REVIEW OF SCIENTIFIC INSTRUMENTS, 1983, 54 (02): : 158 - 160
[49] THE CHEMICAL CHARACTERIZATION OF ZONE REFINED LANTHANUM HEXABORIDE
NOACK, MA
VERHOEVEN, JD
JOURNAL OF CRYSTAL GROWTH, 1980, 49 (04) : 595 - 599
[50] Features of the real structure of lanthanum hexaboride polycrystalline
Zheng, SQ
Min, GH
Zou, ZD
Yu, PL
Han, JD
Paderno, YB
CHINESE PHYSICS LETTERS, 2001, 18 (07) : 942 - 943

← 1 2 3 4 5 →