Nano Archive

Preparation and Characterization of Grain Size Controlled LaB 6 Polycrystalline Cathode Material

Li-Hong, Bao and Jiu-Xing, Zhang and Shen-Lin, Zhou and Yong-Feng, Wei (2010) Preparation and Characterization of Grain Size Controlled LaB 6 Polycrystalline Cathode Material. Chinese Physics Letters, 27 (10). p. 107901.

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Official URL: http://stacks.iop.org/0256-307X/27/i=10/a=107901

Abstract

The grain size controlled bulk Lanthanum hexaboride (LaB e ) cathode material was prepared by using the spark plasma sintering method in an oxygen free system. The starting precursor nanopowders with average grain size of 50 nm were prepared by high-energy ball milling. The nanopowder was fully densified at 1300° C, which is about 350° C lower than the sintering temperature of the coarse powders. The thermionic emission current density was measured to be 42.0 A/cm 2 , which is much higher than 24.2 A/cm 2 of coarse powders and Vickers hardness to be 1860 kg/mm 2 , which is also higher than 1700 kg/mm 2 of coarse one. These results indicate that refining the powder grain size to nano level was beneficial for reducing the sintering temperature and promoting the thermionic emission and mechanic properties.

Item Type:Article
ID Code:11195
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:26
Last Modified:02 Nov 2011 00:47

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