Lanthanum hexaboride LaB6 hmoov

Cov ntaub ntawv luv luv:

Lanthanum hexaborateyog ib qho inorganic non-metallic compound tsim los ntawm tsawg valence boron thiab cov hlau tsis tshua muaj lanthanum, uas muaj cov qauv siv lead ua tshwj xeeb thiab cov yam ntxwv ntawm borides. Los ntawm qhov kev xav ntawm cov khoom siv, lanthanum hexaborate LaB6 belongs rau cov hlau refractory compound nrog lub cubic siv lead ua qauv. Nws muaj cov khoom zoo xws li siab hardness, siab conductivity, siab melting point, tsawg coefficient ntawm thermal expansion, thiab zoo tshuaj stability. Nyob rau tib lub sijhawm, lanthanum hexaborate emits siab tam sim no ceev thiab qis evaporation tus nqi ntawm qhov kub thiab txias, thiab muaj zog tiv thaiv ion bombardment, muaj zog hluav taws xob teb, thiab hluav taws xob. Nws tau raug siv rau hauv cov ntaub ntawv cathode, electron microscopy, electron beam welding Daim ntaub ntawv hauv cov teb uas xav tau cov pa hluav taws xob siab, xws li cov raj xa tawm.

 Lanthanum hexaboratemuaj tshuaj lom neeg ruaj khov thiab tsis hnov ​​​​mob nrog dej, oxygen, lossis txawm tias hydrochloric acid; Nyob rau hauv chav tsev kub, nws tsuas yog reacts nrog nitric acid thiab aqua regia; Oxidation tsuas yog tshwm sim ntawm 600-700 ℃ hauv qhov chaw aerobic. Nyob rau hauv lub tshuab nqus tsev, cov khoom LaB6 yog nquag ua rau muaj kev cuam tshuam nrog lwm yam tshuaj los yog gases los tsim cov ntsiab lus melting tsawg; Thaum qhov kub thiab txias, cov khoom tsim yuav tsis tu ncua evaporate, nthuav tawm qhov kev khiav haujlwm qis ntawm lub lanthanum hexaborate crystal mus rau qhov chaw emission, yog li muab lanthanum hexaborate zoo heev los tiv thaiv kev lom.

Covlanthanum hexaboratecathode muaj tsawg evaporation tus nqi thiab lub neej ua haujlwm ntev ntawm qhov kub thiab txias. Thaum rhuab mus rau qhov kub siab dua, qhov saum npoo hlau lanthanum atoms tsim cov khoom tsis muaj vim evaporation poob, thaum cov hlau sab hauv lanthanum atoms kuj diffuse ntxiv rau qhov chaw ua haujlwm, ua kom cov qauv boron tsis hloov. Cov cuab yeej no txo ​​qis qhov evaporation poob ntawm LaB6 cathode thiab tuav lub active cathode nto tib lub sijhawm. Nyob rau tib lub emission tam sim no ceev, tus nqi evaporation ntawm LaB6 cathode cov ntaub ntawv ntawm qhov kub thiab txias yog qis dua li cov ntaub ntawv cathode, thiab qis evaporation tus nqi yog ib qho tseem ceeb rau kev ncua lub neej kev pab cuam ntawm cathodes.

Daim ntawv thov:

1. Lanthanum hexaborate LaB6 cathode khoom

Lub siab emission tam sim no ceev thiab tsawg evaporation tus nqi ntawm siab kub ntawmLaB6 lanthanum hexaborateua kom nws cov khoom siv cathode nrog kev ua tau zoo dua, maj mam hloov qee qhov tungsten cathodes hauv kev siv tshuab. Tam sim no, thaj chaw thov tseem ceeb ntawm LaB6 cathode cov ntaub ntawv nrog lanthanum hexaborate yog raws li hauv qab no:

1.1 Kev lag luam thev naus laus zis tshiab xws li microwave nqus tshuab hluav taws xob thiab ion thrusters hauv kev ua tub rog thiab chaw siv tshuab, tso saib thiab cov khoom siv nrog cov ntsiab lus siab thiab siab tam sim no emissivity xav tau los ntawm pej xeem thiab tub rog industries, thiab electron beam lasers. Nyob rau hauv cov high-tech industries, qhov kev thov rau cathode cov ntaub ntawv uas tsis muaj kub, siab uniformity emissivity, siab tam sim no emission ceev, thiab ntev lifespan yeej ib txwm nruj heev.

1.2 Lub tshuab electron beam vuam kev lag luam, nrog rau kev txhim kho ntawm kev lag luam, yuav tsum tau siv lub tshuab electron beam vuam tshuab, electron beam melting, thiab cov cuab yeej txiav nrog cathodes uas tuaj yeem ua tau raws li qhov yuav tsum tau muaj qhov ceev tam sim no thiab kev khiav haujlwm tsawg. Txawm li cas los xij, cov cuab yeej siv ib txwm siv tungsten cathodes (nrog rau kev khiav haujlwm siab thiab qis qis qis tam sim no) uas tsis tuaj yeem ua tau raws li cov ntawv thov. Yog li ntawd, LaB6 cathodes tau hloov tungsten cathodes nrog lawv cov kev ua tau zoo tshaj plaws thiab tau siv dav hauv kev lag luam electron beam vuam.

1.3 Nyob rau hauv high-tech kev ntsuas ntsuas kev lag luam,LaB 6cathode siv nws lub siab ci, lub neej ntev thiab lwm yam ntxwv los hloov cov khoom kub cathode xws li tungsten cathode hauv cov khoom siv hluav taws xob xws li electron microscopes, Auger spectrometers, thiab electron probes.

1.4 Hauv kev lag luam accelerator, LaB6 muaj kev ruaj ntseg dua tiv thaiv ion bombardment piv rau cov tsoos tungsten thiab tantalum. Vim li ntawd,LaB 6cathodes yog dav siv nyob rau hauv accelerators nrog txawv qauv xws li synchrotron thiab cyclotron accelerators.

1.5 NwsLaB 6cathode tuaj yeem siv rau hauv cov raj xa hluav taws xob, cov raj laser, thiab magnetron hom amplifiers hauv kev lag luam 1.5 paug raj.

2. LaB6, raws li cov khoom siv hluav taws xob hauv cov cuab yeej siv niaj hnub no, tau siv dav hauv kev lag luam pej xeem thiab kev tiv thaiv:

2.1 Electron emission cathode. Vim tias cov khoom siv hluav taws xob tsawg tsawg, cov khoom siv cathode nrog lub siab tshaj plaws emission tam sim no ntawm qhov nruab nrab kub tuaj yeem tau txais, tshwj xeeb tshaj yog cov khoom siv hluav taws xob zoo, uas yog cov khoom siv zoo tshaj plaws rau lub zog hluav taws xob hluav taws xob hluav taws xob cathodes.

2.2 High brightness point teeb qhov chaw. Cov khoom siv tseem ceeb siv los npaj cov tshuab ntsuas hluav taws xob, xws li cov ntxaij lim dej kho qhov muag, mos X-ray diffraction monochromators, thiab lwm yam khoom siv hluav taws xob hluav taws xob.

2.3 High stability thiab siab lifespan system Cheebtsam. Nws txoj kev ua tau zoo heev ua rau nws daim ntawv thov nyob rau hauv ntau lub tshuab hluav taws xob, xws li hluav taws xob beam engraving, electron beam heat sources, electron beam welding guns, and accelerators, for the production of high-performance components in engineering fields.

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