Yuav Ua Li Cas Xaiv Cov Cuab Yeej Cuab Yeej thiab Cov Cuab Yeej Cuab Yeej rau Lub Siab -Nqus Tsev, Siab -Tsub Sintering Xovxwm?

Txhawm rau sinter advanced ceramics, carbides los yog refractory hlau koj xav tau ib lub xovxwm uas muaj peev xwm ua hauj lwm ntawm lub tshuab nqus tsev siab thiab kub thaum tus qauv steels poob lawv cov qauv thiab pib muab cov vapors ntau heev. Nyob rau hauv cov kev mob siab no, cov cua sov phaj dhau los ua cov txheej txheem tseem ceeb thiab thermal keeb ntawm lub system. Li no, kev tsim lub tshuab nqus tsev siab sintering xovxwm rau cua sov platens yog raws li cov ntaub ntawv uas ruaj khov, muaj zog thiab ultra-tsawg nyob rau hauv outgassing nyob rau hauv tej yam kev mob siab tshaj 1000℃thiab nqus nqus tsev vacuum.

Ntawm cov kub no lub platen yog ib qho flaming ntawm tib lub nceeg vaj ntxhia uas nws ua. Kev xaiv cov khoom yuav tsum tau ua los ntawm cov khoom siv refractory feem ntau muaj nyob rau hauv engineering xyaum.

Kev ua haujlwm hnyav rau lub tshuab nqus tsev sintering
Lub siab -nqus sintering presses yog siv rau densification ntawm cov ntaub ntawv, uas yuav tsum tau:

Ultra- siab purity pa cua cua

Qhov kub thiab txias profiles siab tshaj 1000 degree

Tswj lub siab thov thaum lub sij hawm sintering txheej txheem

Cov kab mob me me los ntawm cov khoom siv cuab yeej

Lub tshuab nqus tsev ib puag ncig tiv thaiv oxidation tab sis xav tau cov khoom siv nruj heev volatility thiab outgassing zog.

Vim li cas cov hlau tsis tu ncua
Pa stainless hlau thiab npib tsib xee alloys tsis tsim nyog vim:

Mechanical zog diminishes sai tshaj li ~ 800-900 degree

Qhov tseem ceeb outgassing hauv lub tshuab nqus tsev

Workpiece contamination los ntawm qhov chaw paug

Siab creep nyob rau hauv load

Cov kev txwv no hu rau kev hloov pauv mus rau cov hlau refractory thiab carbon- cov khoom siv.

Kev xaiv cov khoom siv rau cua sov Platen ntawm High Vacuum Sintering Presses
Kev xaiv cov khoom siv rau cov cua sov platen ntawm lub tshuab nqus tsev sintering siab yog nyob ntawm thermal stability, mechanical zog thiab lub tshuab nqus tsev compatibility.

Graphite raws li cov khoom siv Platen
Graphite yog ib yam khoom siv rau lub tshuab nqus tsev sintering platens, tshwj xeeb tshaj yog nyob rau hauv nruab nrab mus rau qhov kub thiab txias systems.

Cov khoom tseem ceeb ntawm Graphite
Nyob ruaj khov nyob rau hauv inert los yog nqus mus txog approx . 2500 degree

Zoo heev thermal shock kuj

Lub platen yog machinable heev rau cov geometry nyuaj

Tus nqi pheej yig piv rau cov hlau refractory

Feem ntau siv hauv graphite platens muaj xws li:

Kub- pressing systems

Furnaces rau hmoov Metallurgy

Ceramic pressings

Graphite, txawm li cas los xij, yog qhov ntxeem tau thiab yuav tsum tau ntxuav kom zoo thiab kho kom txo tau cov pa tawm.

Molybdenum thiab Tungsten rau Ultra{0}}High Temperature Phaj
Ntawm cov hlau refractory siv rau qhov xav tau tshaj plaws sintering daim ntaub ntawv yog molybdenum thiab tungsten.

Cov yam ntxwv ntawm Molybdenum
Melting point ca . 2620 degree

Siab nruj ntawm qhov kub thiab txias

High thermal conductivity tshaj ceramic

Zoo dimensional stability nyob rau hauv lub tshuab nqus tsev vacuum

Cov yam ntxwv tungsten
Melting point: ~ 3422 degree

Siab kub zog - zoo heev

High ceev thiab rigidity

Zoo heev creep kuj

Nyob rau ntawm qhov kub thiab txias, platen yog ib qho hluav taws kub ntawm tib lub nceeg vaj ntxhia nws cov txheej txheem, nrog cov khoom siv tseem ceeb hauv kev sib xyaw nrog sintered Cheebtsam lawv tus kheej.

Kev txwv tseem ceeb
Molybdenum tsis tuaj yeem siv rau hauv oxidizing cua. Cov kub kub ua rau oxidation sai, ua rau cov khoom puas tsuaj puas tsuaj. Yog li ntawd, molybdenum thiab tungsten tshuab tsuas yog ua haujlwm hauv:

Lub tshuab nqus tsev siab.

Inert roj cua (argon, helion)

Txo cov kev tswj xyuas

Vacuum Platens Heating Element Technologies
Cov cua kub hauv siab nqus sintering presses yog muab los ntawm refractory haum cov ntsiab lus.

Hlau heaters ntawm molybdenum
Molybdenum hlau yog feem ntau siv vim nws tau sib xws nrog lub tshuab nqus tsev thiab kub kub. Nws yuav yog:

Sab hauv cov graphite qauv

dai qab daim ntaub thaiv qhov kaj

Ua hauv platen sib dhos

Silicon Carbide Cheebtsam
SiC rods qee zaum siv hauv lub tshuab nqus tsev qis lossis kev hloov pauv. Cov ntsiab lus no feem ntau yog radiant heaters thiab nyob sab nraum platen nto.

Radiative cua sov Dominance
Convection tsis tseem ceeb ntawm lub tshuab nqus tsev siab. Lub hom phiaj tseem ceeb ntawm kev thauj khoom kub yog:

Radiation los ntawm cov khoom cua sov

Platen qauv conduction

Thaum tshav kub kub shields uas yog reflective

Outgassing Control thiab Vacuum Compatibility
Nws yog ib qho tseem ceeb uas cov khoom siv kom huv si vim tias cov roj uas tau muab tawm hauv lub tshuab nqus tsev sintering tuaj yeem ua rau lub tshuab nqus tsev puas tsuaj thiab ua rau sintered tshwm sim.

Qhov chaw muaj kuab paug
Feem ntau qhov chaw ntawm kev kis kab mob yog:

Organic residues ntawm machinery roj

Adsorbed noo noo tam sim no nyob rau hauv huab cua

Volatile contaminants nyob rau hauv cov ntaub ntawv hauv paus

Oxides thiab carbon compounds ntawm qhov chaw

Lub tshuab nqus tsev ci -Cov txheej txheem tawm
Feem ntau, platen sib dhos yog ci tawm hauv lub voj voog tswj ua ntej siv.

Hauv cov txheej txheem no:

Cov cua sov ntawm lub platen nyob rau hauv lub tshuab nqus tsev

Qhov kub thiab txias yog siab tshaj qhov xav tau ntawm kev ua haujlwm

Volatile hom raug tshem tawm los ntawm matrix ntawm cov khoom

cov pa roj seem yog nqus tawm ntawm qhov system

Cov txheej txheem preconditioning no yog xav tau rau lub tshuab nqus tsev ruaj khov thaum lub sij hawm ntau lawm.

Mechanical thiab Thermal Design Considerations
Lub siab kub platens yuav tsum tau dimensionally ruaj khov nyob rau hauv thermal stress thiab mechanical siab.

Thermal Expansion Control
Graphite thiab refractory hlau yog qhov txawv ntawm qhov sib txawv thermal expansion. Qhov system tsim yuav tsum coj mus rau hauv tus account:

Txawm hais tias nthuav dav ntawm cov platen loj

Tsis txhob thermal stress concentration

Tswj cua sov gradients thaum nce thiab nqis

Lub cev hnyav yuav tsum muaj
Hauv cov ntawv thov kub nias, lub platen kuj yog cov khoom siv thauj khoom-cov kabmob. Yog li kev xaiv cov khoom yuav tsum coj mus rau hauv tus account:

Creep kuj nyob rau hauv sustained load

Elastic modulus ntawm kev ua haujlwm kub

stability ntawm ntev - lub sij hawm deformations

Sib piv cov txheej txheem ntawm kev xaiv cov khoom
Material Max TempVacuum Compatibility Mechanical StrengthTypical daim ntawv thov
Graphite ~ 2500℃Zoo heev (nqus / inert) Nruab Nrab General sintering phaj
Molybdenum ~ 2620℃Zoo heev (tsis yog -oxidizing nkaus xwb) High High -precision xovxwm
Tungsten ~ 3422℃Zoo heev (tsis yog - oxidizing nkaus xwb) Lub tshuab kub siab heev
System Architecture thiab txheej txheem kev koom ua ke
Feem ntau, cov tshuab cua sov platen tau ua ke nrog cov txheej txheem zoo ntawm lub qhov cub- xovxwm sib dhos, xws li:

Thermal tswj systems rau ntau-zones

Lub tshuab nqus tsev twj tso kua mis (siab thiab tsis tshua muaj siab nqus)

Cov kab hluav taws xob tiv thaiv

Pressing systems (hydraulic lossis mechanical)

Txhim khu kev ntsuas kub ntsuas cov tes hauj lwm

Txhua lub subsystem yuav tsum tau tsim kom ruaj khov nyob rau hauv lub siab kub thiab lub tshuab nqus tsev ib puag ncig.

Kaw kev xav
Qhov kev txiav txim siab ntawm cov khoom siv hluav taws xob ntawm kev xaiv cov cua sov platen rau siab -kub lub tshuab nqus tsev sintering xovxwm yog ib qho tseem ceeb tshaj plaws hauv kev tsim thermal ua. Graphite, molybdenum thiab tungsten txhua tus muaj lawv tus kheej sib xyaw ua ke ntawm thermal stability, txhua yam muaj zog thiab lub tshuab nqus tsev sib raug zoo, ua rau kev ua haujlwm ntawm qhov kub thiab txias uas lwm yam khoom siv yuav ua tsis tiav.

Yog li cov khoom siv cua sov platen siab lub tshuab nqus tsev sintering xovxwm yog qhov tshwj xeeb tus nqi siab ua los ntawm cov khoom siv uas tuaj yeem muaj sia nyob rau qhov xwm txheej hnyav uas lawv pab tsim. Kev xaiv cov khoom siv hauv cheeb tsam no yog qhov tseem ceeb ntawm txoj kev tshawb fawb ntawm qhov kawg ntawm lub sij hawm lub sij hawm, qhov kev ua tau zoo yog txiav txim siab los ntawm kev ruaj ntseg refractory thiab ultra- lub tshuab nqus tsev siab.

Cov txheej txheem tsim khoom kub tshaj plaws ntawm cov cuab yeej tsim los ntawm tib lub hauv paus pib thaum kawg yog tsim los ntawm qhov chaw siab tshaj plaws hauv qhov xwm txheej, qhov kev txwv thermal thiab cov txheej txheem sib ntsib ntawm ntug ntawm cov khoom muaj peev xwm.