Thaum koj hnov 'hom sintering,' feem ntau cov phau ntawv dhia ncaj nraim mus rau classic solid-state vs. kua-theem sib txawv. Qhov ntawd yog qhov zoo hauv txoj kev xav, tab sis ntawm lub khw hauv pem teb, qhov kev xaiv binary zoo li yuav luag tsis paub. Qhov kev txiav txim siab tiag tiag yog messier, uas tau tsav los ntawm cov hmoov hlau alloy uas koj tau daig nrog tag kis, qhov chaw geometry uas engineering tsuas yog cuam tshuam rau ntawm phab ntsa, thiab lub siab tsis tu ncua los ntawm kev tsim khoom kom ntaus lub hom phiaj ntom ntom yam tsis tau tshuab lub zog pob nyiaj siv. Kuv tau pom ntau tus juniors fixate ntawm xaiv qhov 'txoj cai' hom los ntawm daim ntawv qhia, tsuas yog kom lub cub tawg qhia ib zaj dab neeg sib txawv. Cia peb tham txog qhov tshwm sim tiag tiag thaum lub qhov cub qhov rooj kaw.
Solid-State Sintering: Tus Neeg Ua Haujlwm thiab Nws Cov Quirks zais
Qhov no yog lub neej ntawd, lub hauv paus. Koj nyob nraum consolidating hmoov hauv qab lub melting point ntawm lub loj constituent, cia siab rau atomic diffusion. Rau ntau ntawm peb cov ferrous Cheebtsam ntawm QSY, tshwj xeeb tshaj yog cov qauv yooj yim ntawm cov hlau los yog cov hmoov hlau uas tsis tshua muaj hlau, qhov no yog qhov peb pib. Cov txheej txheem zoo li yooj yim - nce, tuav, txias. Tab sis dab ntxwg nyoog nyob rau hauv cov ntsiab lus, tshwj xeeb tshaj yog cov huab cua tswj. Tau txais qhov xau me me hauv koj lub tshuab nqus tsev lossis qhov hiccup hauv koj qhov sib xyaw hydrogen / nitrogen, thiab koj tsis yog saib ntawm qhov chaw oxidation. Koj tab tom hloov cov diffusion kinetics ntawm lub caj dab cheeb tsam ntawm cov khoom, ua rau tsis muaj zog bonds thiab ib feem uas yuav ua tsis tau raws li machining. Peb kawm qhov no nyuaj heev xyoo dhau los ntawm ib pawg ntawm cov iav blanks; sintered ntom zoo saib zoo ntawm daim ntawv qhia, tab sis lawv chattered thiab tawg thaum lub sij hawm hobbing txheej txheem. Tus neeg ua txhaum? Ib me ntsis oxidizing huab cua uas tsim ib tug nyias, nkig oxide zaj duab xis nyob rau hauv lub grain ciam teb, pom tsis tau rau cov txheej txheem ceev checks.
Tus nqi cua sov yog lwm qhov sib txawv uas ntsiag to. Cov ntaub ntawv nkhaus yog du. Hauv kev muaj tiag, yog tias koj ramp ceev heev nrog qee cov duab compacted, koj tuaj yeem tsim kev ntxhov siab sab hauv uas ua rau sib txawv shrinkage lossis txawm warping. Nws tsis yog tsuas yog ncav cuag qhov sov so; nws yog hais txog yuav ua li cas koj mus txog ntawd. Rau cov duab nyuaj peb tshuab tom qab sintering, zoo li qee qhov stainless hlau valve lub cev peb lis, tswj, ntau theem ramp yog tsis-negotiable los tswj qhov seem stability rau cov tom ntej CNC ua hauj lwm.
Thiab cia peb tsis txhob hnov qab cov hmoov nws tus kheej. Qhov kev xav ntawm 'ntshiab' solid-state sintering tau qhov muag plooj nrog cov hmoov ua ntej-alloyed. Txawm hais tias muaj cov ntsiab lus zoo li npib tsib xee lossis tooj liab hauv cov hmoov hlau, koj tuaj yeem tau txais cov theem ua kua hauv zos yog tias qhov kub thiab txias tshwm sim. Yog li, koj tab tom tsom mus rau lub xeev ruaj khov, tab sis koj yuav tsum paub tias koj yuav flirting nrog lwm yam. Nws yog qhov grey cheeb tsam uas cais ib daim ntawv qhia los ntawm cov txheej txheem muaj zog.
Liquid Phase Sintering: Qhov twg Yam Txaus Ntshai (thiab nplaum)
Tam sim no qhov no yog qhov uas koj nquag qhia qhov qis-melting-point tivthaiv. Cov piv txwv classic yog ntxiv tooj liab rau hlau. Lub tswv yim zoo nkauj: cov ntaub ntawv ua kua, ntub cov khoom nplej, thiab los ntawm kev ua capillary thiab kev daws-reprecipitation, koj tau txais ceev ceev. Qhov tseeb ntawm cov kab ntau lawm yog kev sib ntaus sib tua tsis tu ncua ntawm lub ntiajteb txawj nqus thiab lub sijhawm-slumping. Yog tias cov kua ntim feem ntau siab dhau los yog cov viscosity tsawg dhau, koj qhov ua tib zoo nias tuaj yeem sag lossis poob nws cov duab hauv qhov cub. Kuv nco qab txog ib qhov project rau cov kabmob siab uas peb tau thawb cov ntsiab lus tooj liab. Peb tau txais qhov ntom ntom, zoo, tab sis ib feem tau tawm zoo li lub tswm ciab, yaj. Peb yuav tsum hu xov tooj rov qab, lees txais qhov qis me ntsis thawj zaug los ntawm kev nias, thiab siv ntau qhov tseeb sintering profile los tswj cov kua theem ntev.
Lub kaum sab xis yog txhua yam. Yog hais tias cov kua tsis ntub cov khoom nplej kom zoo, nws tuaj rau hauv lub qhov hws es tsis txhob kis raws li cov ciam teb. Koj xaus nrog kev sib cais, qhov pores loj thiab lub zog tsis zoo. Qhov no tsis yog cov ntaub ntawv tshawb fawb xwb; Nws raug cuam tshuam los ntawm qhov chaw oxides, me impurities, thiab cua sov cua. Rau qhov tshwj xeeb alloys peb ua hauj lwm nrog, zoo li ib co nickel-based sawv daws yuav, xaiv qhov tseeb sintering pab yog ib tug proprietary art. Nws yog qhov tsawg dua ntawm kev ua raws li phau ntawv qhia thiab ntau ntxiv txog kev sim rov ua dua, feem ntau koom tes nrog peb cov neeg muag khoom hmoov.
Tom qab ntawd muaj qhov microstructure. Nrog cov kua theem sintering, koj feem ntau sab laug nrog cov qauv sib xyaw - cov khoom nplej uas nyob ib puag ncig los ntawm lwm theem. Qhov no tuaj yeem ua tau zoo rau kev hnav tsis kam lossis cov khoom sib nqus tshwj xeeb, tab sis nws hloov pauv li cas ntawm cov tshuab. Thaum peb CNC faib ntawm Qingdao Qiangsenyuan Technology Co., Ltd. (QSY) tau txais cov kua-theem sintered ib feem, cov machining tsis (ceev, pub, qib cuab yeej) xav tau ib tug tiav kev tshuaj xyuas piv rau ib tug solid-state sintered ib feem ntawm tib lub hauv paus khoom. Lub hardness tsis zoo li qub, thiab cov cuab yeej hnav cov qauv tsis tuaj yeem pom tau yog tias koj kho nws zoo li ib daim ntawv homogeneous.
Pressure-Assisted Sintering: Qhov Kev Ua Si Ceev Hloov
Qee lub sij hawm, cov pa sintering tsuas yog yuav tsis tuaj rau koj, tshwj xeeb tshaj yog rau tag nrho cov densification los yog nrog cov ntaub ntawv tsis yooj yim xws li cov hlau refractory lossis qee yam ceramics. Qhov ntawd yog qhov uas koj nqa phom loj: siab. Kub Pressing (HP) thiab Kub Isostatic Pressing (HIP) yog nyob rau hauv ib pab koomtes sib txawv. Peb tsis siv cov no rau cov khoom ntim siab, tus nqi qis - lub sijhawm voj voog thiab cov khoom siv raug txwv. Tab sis rau ib qho piv txwv los yog ib qho tseem ceeb hauv cov hlau tshwj xeeb, xws li cobalt-based alloy foob rau qhov chaw huab cua, HIP yog ib qho kev cawm siav.
Kub Isostatic Pressing yog fascinating. Koj muab qhov ntsuab tso rau hauv lub thawv ntim, tshem tawm, thiab tom qab ntawd muab nws rau qhov kub thiab txias thiab isostatic gas siab (argon, feem ntau). Lub siab tawg sab hauv pores los ntawm tag nrho cov lus qhia, ua rau ze-theoretical ntom. Tus ntes? Cov txheej txheem canning yog ib daim duab kos duab. Txhua qhov xau, thiab cov roj nkag mus rau hauv, ua kom puas qhov chaw. Thiab qhov kev hloov pauv loj yog qhov kwv yees tau zoo heev tab sis tsis yog ib txwm tsis tseem ceeb los them nyiaj rau hauv thawj qhov cuab yeej. Peb tau siv HIP rau densifying complex peev-cam khwb cia Cheebtsam ib yam nkaus thiab, uas blurs txoj kab ntawm tsoos casting thiab hmoov metallurgy cov tswv yim.
Qhov kev txwv, tshaj tus nqi, yog ib feem loj. Koj lub ntiaj teb yog txhais los ntawm txoj kab uas hla thiab qhov siab ntawm koj lub nkoj HIP. Rau cov khoom loj, koj rov qab mus rau kev sib tw nrog cov pa sintering thiab nws cov kev cuam tshuam. Nws yog ib qho cuab yeej, muaj zog heev, tab sis tsis yog kev daws teeb meem thoob ntiaj teb.
Spark Plasma Sintering thiab Lwm Cov Kev Pabcuam Kev Pabcuam
Qhov no yog cov khoom nyob rau hauv pem hauv ntej, feem ntau nyob rau hauv R & D labs los yog heev niche ntau lawm. Spark Plasma Sintering (SPS) lossis Field-Assisted Sintering Technique (FAST) siv lub zog ncaj qha tam sim no thiab uniaxial siab. Kev muag khoom loj yog qhov ceev-qhov cua kub ceev heev thiab lub sijhawm nyob luv luv, uas tuaj yeem ua rau txoj kev loj hlob ntawm cov nplej. Nws yog qhov ci ntsa iab rau nanomaterials lossis khaws cia cov qauv hmoov tshwj xeeb.
Tab sis los ntawm kev tsim khoom, nws yog qhov nyuaj. Scale-up yog qhov teeb meem loj. Kev ua kom loj, cov duab zoo sib xws nrog SPS yog qhov kev sib tw uas peb tseem tab tom saib los ntawm sab nraud. The other issue is that the very fast cycle can sometimes leave residual stresses or create density gradients if the die design and current paths aren't perfect. Rau ib lub tuam txhab xws li QSY, nrog rau kev tsom mus rau kev xa cov khoom pov thawj thiab cov tshuab ua haujlwm, peb saib xyuas cov kev nce qib no ze. Tej zaum lawv yuav muaj feem cuam tshuam rau qhov project yav tom ntej uas muaj cov hmoov hlau tshiab, tab sis tam sim no, lawv tseem yog cov cuab yeej tshwj xeeb. Qhov tseem ceeb takeaway yog tias 'hom' ntawm sintering tsis yog ib qho kev xaiv xwb; nws yog ib qho kev txwv uas txhais los ntawm cov cuab yeej koj tau nkag mus rau thiab cov nyiaj txiag batch loj.
Qhov Kev Pom Zoo Tshaj Plaws: Sintering ua ib feem ntawm txoj saw, Tsis yog Island
Qhov no yog kab tias qhov tseem ceeb tshaj plaws los ntawm 30 xyoo hauv kev lag luam no. Koj tsis tuaj yeem cais cov kauj ruam sintering. Nws txoj kev vam meej lossis tsis ua tiav yog txiav txim siab los ntawm qhov ua ntej thiab tom qab. Cov yam ntxwv ntawm cov hmoov (loj faib, morphology, lubricant) teem rau theem. Txoj kev compaction (uniaxial, isostatic, hlau txhaj tshuaj molding) txhais cov xim ntsuab ntom thiab pore qauv lub sintering yuav tsum tau ua hauj lwm nrog.
Thiab qhov tseem ceeb, dab tsi los tom qab? Yog hais tias ib feem mus ncaj nraim rau kev pab cuam, lub sintering yuav tsum xa cov khoom kawg. Tab sis ntawm QSY, ntau ntawm peb cov hmoov ua tiav tau txais CNC machining tseem ceeb. Ib qho sintered tsis zoo yuav muaj qhov zais ntawm qhov porosity lossis tsis sib haum, uas yuav ua rau cov cuab yeej tawg, ua kom tsis zoo, thiab cov khoom seem thaum lub sij hawm ua haujlwm - nkim tag nrho cov nqi ntxiv mus txog qhov ntawd. Lub sintering profile yuav tsum tau tsim nrog lub tshuab hauv siab. Qee lub sij hawm, nws yog qhov zoo dua rau sinter mus rau qhov qis dua me ntsis uas zoo sib xws, tshuab nws, thiab tom qab ntawd siv cov haujlwm thib ob xws li qhov kub thiab txias anneal lossis txawm tias qhov kev kho deg los ntaus cov specs kawg.
Thaum kawg, lub cub tawg nws tus kheej yog ib qho kev ua neej nyob. Lub refractory hauv ob sab phlu degrades lub sij hawm, cuam tshuam rau thermal uniformity. Cov cua sov hnub nyoog. Thermocouples drift. Ib sintering 'hom' tsis yog ib daim ntawv qhia zoo li qub; nws yog txoj kev ua neej uas xav tau kev saib xyuas tas li thiab hloov kho. Cov kws kho mob zoo tshaj plaws uas kuv paub muaj kev xav rau lawv lub qhov cub-lawv mloog lawv, saib cov xim ntawm cov khoom tawm, thiab sib txuas nrog cov ntaub ntawv teev tseg. Nws yog qhov kev sib txuas ntawm kev tshawb fawb, cov khoom siv intuition, thiab kev nkag siab ntawm tag nrho cov saw hlau uas hloov cov sintering specification rau hauv kev txhim khu kev qha, hnub-hauv, hnub-tawm txheej txheem. Nws tsawg dua txog kev xaiv ib hom thiab ntau ntxiv txog kev paub txog qhov sib txawv hauv hom koj qhov project xav tau.
