Properties of high density LaB6 cathode prepared by spark plasma solid phase sintering - Details

Author：

Zhou, Shenlin (Zhou, Shenlin.) | Zhang, Jiuxing (Zhang, Jiuxing.) (Scholars：张久兴) | Liu, Danmin (Liu, Danmin.) (Scholars：刘丹敏)

Indexed by：

EI Scopus PKU CSCD

Abstract：

High　density　LaB6　polycrystalline　bulks　were　fabricated　by　spark　plasma　sintering(SPS)　LaB6　powders　prepared　by　boron　carbide　reduction　method.　The　effects　of　sintering　temperature　and　pressure　on　the　phase　formation,　microstructure　and　properties　of　the　sintered　LaB6　bulks　were　studied　systematically.　The　optimal　technological　parameters　are　sintering　temperature　of　1650　°C,　sintering　pressure　of　50　MPa　and　holding　time　of　10　mins.　It　is　shown　that,　the　mechanical　and　emissive　properties　of　the　sintered　LaB6　bulks　are　much　better　than　that　prepared　by　other　methods.　The　relative　density　of　the　LaB6　sintered　by　SPS　is　up　to　96.2%,　and　its　vickers　hardness　reaches　1720　kg/mm2.　The　highest　bend　strength　is　203.2　MPa.　The　electron　emitting　density　of　the　polycrystalline　LaB6　sintered　by　SPS　is　17.41　A/cm2　at　1520　°C,　and　the　work　function　is　2.40　eV.　SPS　method　obviously　decreases　the　sintering　temperature　of　LaB6　and　shortens　the　sintering　time.

Keyword：

Lanthanum alloys Plasmas Boron carbide Boron Mechanical properties Laboratories Organic polymers Lanthanum compounds Borides Vickers hardness Spark plasma sintering Electric sparks Lanthanum

Author Community：

[ 1 ] [Zhou, Shenlin]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Zhang, Jiuxing]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Liu, Danmin]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China