Thaum koj hnov 'colloidal silica peev casting', ntau tus neeg tam sim ntawd xav txog cov ntaub ntawv - tsuas yog cov kua mis uas koj sib tov rau hauv slurry. Qhov ntawd yog thawj qhov chaw uas qhov kev xav feem ntau mus yuam kev. Nws tsis yog kua nplaum xwb; nws yog tag nrho cov txheej txheem pob txha ntawm lub plhaub, thiab yuav ua li cas koj tswj nws cov chemistry thiab daim ntawv thov dictates seb koj puas tau txais ib tug flawless casting los yog ib tug warehouse tag nrho ntawm seem. Kuv tau pom cov khw muab nyiaj rau hauv cov khoom siv hwm zoo nkaus xwb kom plam tag nrho ntawm lub plhaub tsis zoo uas tawg lossis cov leeg. Qhov kev ua si tiag tiag yog nyob rau hauv lub colloidal silica qhov particle loj tis, pH stability, thiab frankly, cov kev qhuab qhia ntawm cov txheej txheem tswj, uas ntau underestimate mus txog rau thaum lawv ntsib ib tug kim tsis ua hauj lwm.
Lub luag haujlwm tsis nkag siab ntawm Colloidal Silica
Cia peb tau tshwj xeeb. Colloidal silica tsis yog ib yam khoom. Cov khoom koj tau txais los ntawm cov neeg muab khoom sib txawv coj txawv txawv. Peb kawm qhov no nyuaj heev xyoo dhau los. Peb hloov mus rau qhov pheej yig dua, off-brand colloidal silica rau peb lub plhaub pwm casting txheej txheem, piv txwv li cov specs ntawm daim ntawv tau ze txaus. Cov ntsiab lus sodium tau siab dua me ntsis. Qhov tshwm sim? Tom qab lub dewaxing theem, thawj coats tsim micro-crazing. Tsis pom tseeb tam sim ntawd, tab sis thaum lub sij hawm kub kub kub, cov kab nrib pleb me me tau nthuav tawm. Qhov kawg castings, tshwj xeeb tshaj yog nyob rau hauv complex stainless hlau qhov chaw, pom zoo ib yam hlau nkag. Tag nrho batch poob. Qhov ntawd yog thaum nws clicked: ionic stability thiab Na2O cov ntsiab lus nyob rau hauv lub binder yog tsis-negotiable tsis. Nws tsis yog khoom.
Qhov no txuas ncaj qha mus rau hauv peev casting ntawm tshwj xeeb alloys zoo li cov nickel-based sawv daws yuav. Cov alloys no muaj cov ntsiab lus siab melting thiab yog incredibly reactive. Yog tias lub plhaub tsis zoo kawg nkaus refractory thiab ruaj khov, koj tau txais kev sib cuam tshuam ntawm cov hlau-plhaub-qhov tsis zoo hu ua slag suav nrog lossis nto pitting. Lub siab-purity, low-alkali colloidal silica yog qhov tseem ceeb ntawm no. Nws tsim muaj zog dua, ntau dua refractory silica network tom qab tua. Kuv nco qab txog ib qhov project rau lub turbine tivthaiv uas peb siv tus qauv binder; qhov saum npoo tiav yog tsis tsim nyog. Hloov mus rau qhov tsim nyog, colloidal silica system nrog ib tug nruj particle faib daws nws. Dab ntxwg nyoog yog nyob rau hauv cov ntsiab lus.
Koj pom cov tuam txhab nyiam Qingdao Qiangsenyuan Technology Co., Ltd. (QSY) nrog lawv peb xyoo caum hauv plhaub pwm thiab peev casting. Lawv yuav paub qhov no implicitly. Thaum koj tab tom cuam tshuam nrog cobalt-raws li alloys hnub nyob rau hauv thiab tawm hnub, koj tsis tuaj yeem them taus kho cov ntaub ntawv raws li kev xav tom qab. Lawv lub sijhawm ua haujlwm ntev qhia txog kev nkag siab tob, kev nkag siab ntawm cov khoom siv sib cuam tshuam uas koj tsuas yog tau txais los ntawm kev rov ua haujlwm ntau lawm thiab daws teeb meem.
Kev Tswj Xyuas Txheej Txheem: Qhov Kev Xav Tau Raws Li Lub Khw Muag Khoom
Zoo, yog li koj tau txais ib daim ntawv zoo. Tom ntej no pitfall yog lub slurry chav ib puag ncig. Kev tswj kub thiab av noo. Nws suab yooj yim, tab sis kuv tau nyob hauv cov chaw tsim khoom uas qhov no yog qhov kev xav tom qab. Colloidal silica-based slurries yog rhiab heev. Yog tias lub khw kub dhau, cov gels slurry ceev dhau, cov viscosity spikes, thiab koj cov txheej thickness yuav tsis sib haum. Cov av noo dhau lawm, thiab lub sijhawm ziab ntawm cov tsho tiv no ncab tawm, tua koj cov kev sib tw ntau lawm. Peb muaj lub caij ntuj sov uas AC ua tsis tiav hauv chav slurry. Tag nrho cov khoom ntawm peev casting shells rau lub cev lub cev yuav tsum tau muab pov tseg vim hais tias cov primer lub tsho tiv no qhuav sai heev, tsim kom muaj ib tug tsis muaj zog interface nrog rau tom ntej stucco txheej.
Cov txheej txheem dipping thiab stuccoing yog lwm yam txuj ci. Thawj lub tsho tiv no yog txhua yam. Nws yuav tsum tau ua kom zoo kawg nkaus replicate tus qauv siv quav ciab nthuav dav. Peb siv cov hmoov zircon zoo heev nrog cov colloidal silica rau thawj lub tsho tiv no. Tab sis tus neeg sawv cev ntub dej qhov concentration yuav tsum tau pom. Tsawg dhau, thiab koj tau txais npuas thiab voids ntawm tus qauv nto. Ntau dhau, thiab cov slurry khiav tawm, tsim cov pob me me. Qhov no tsis yog ib yam uas koj teem ib zaug thiab tsis nco qab. Cov khoom siv siv quav ciab, nws qhov kub thiab txias, txawm tias tus neeg sawv cev tso tawm siv rau ntawm qhov tuag, txhua yam cuam tshuam rau nws. Nws yog ib qho kev hloov kho tas li.
Thiab ziab. Kev quab yuam cua kom qhuav yog ib qho, tab sis cov cua ntws yuav tsum yog laminar, tsis turbulent. Koj tsis xav tau hmoov av los ntawm hauv pem teb (uas feem ntau yog tag nrho ntawm cov khoom siv stucco yav dhau los) embed nws tus kheej rau hauv lub tsho ntub dej. Peb tsim lub rooj muag khoom zoo-siab yooj yim rau ziab cov tsho loj thawj zaug, thiab qhov tsis xws luag los ntawm kev suav nrog poob qis. Cov no yog cov unglamorous, peev-intensive cov ntsiab lus uas cais ib tug txhim khu kev qha txheej txheem los ntawm ib tug chaotic.
Case hauv Point: Plhaub Pwm rau Complex Geometry
Siv ib tug complex impeller casting, nyias hniav, sib sib zog nqus contours. Qhov kev sib tw tsis yog ua kom lub plhaub muaj zog txaus; nws ua rau nws permeable txaus kom cia gases khiav thaum lub sij hawm nchuav thiab burnout. Qhov no yog qhov uas cov colloidal silica binder tus gel qauv yog qhov tseem ceeb. Yog tias koj dhau-stabilize lub slurry kom tau lub sijhawm ua haujlwm ntev, koj tuaj yeem cuam tshuam cov gel lub micro-porosity tom qab tua. Nws dhau los ua ntom.
Peb tau sim nrog kev ntxiv zoo heev, tswj tus nqi ntawm tus neeg sawv cev ntub dej thiab kho tus neeg sawv cev gelling (feem ntau yog alkali ntsev) kom zoo-tune qhov no. Lub hom phiaj yog lub plhaub uas dhau cov qauv kev ntsuas lub zog tab sis kuj muaj cov roj permeability ntau dua. Qhov kev puas tsuaj los ntawm tsis yog tsuas yog saib ntawm daim ntawv teev cov ntaub ntawv, tab sis los ntawm kev khiav peb tus kheej kev ntsuas permeability ntawm cov qauv raug rho tawm haujlwm. Peb correlated sib txawv slurry batch nrog qhov tseeb casting tshwm sim rau steel Cheebtsam. Cov ntaub ntawv tsis zoo, tab sis qhov sib txawv yog qhov tseeb: me ntsis qis dua viscosity slurry, siv rau hauv cov tsho loj dua, ua rau cov qauv raug rho tawm haujlwm zoo dua rau cov khoom sib txawv.
Qhov kev daws teeb meem zoo li no yog qhov tseem ceeb ntawm kev tshaj lij plhaub molding. Nws tsis yog phau ntawv. Nws yog hais txog kev tsim koj tus kheej cov ntaub ntawv sab hauv ntawm qhov laj thawj thiab qhov tshwm sim. Ib lub tuam txhab zoo li QSY, tshwj xeeb hauv ob qho tib si casting thiab CNC machining, yuav muaj lub voj voog tawm tswv yim nruj. Lawv tuaj yeem siv lub tshuab casting, pom qhov tsis xws luag ntawm lub plhaub ntawm lub plhaub, thiab taug qab nws rov qab mus rau ib qho tshwj xeeb slurry batch lossis ziab qhov ntsuas. Qhov kev sib xyaw ua ke muaj peev xwm muaj zog.
Lub Alloy Factor: Yog vim li cas cov khoom dictates Binder xaiv
Qhov no coj kuv mus rau cov ntaub ntawv. Ua hauj lwm nrog cam khwb cia hlau yog ib lub ntiaj teb no; ua hauj lwm nrog reactive superalloys yog lwm. Rau npib tsib xee los yog cobalt-raws li alloys, lub plhaub yuav tsum tsis yog tsuas yog muaj zog, tab sis kuj chemically inert. High-alumina refractories feem ntau yog siv rau hauv lub tsho tiv no. Tab sis lub binder - lub colloidal silica - yog lub universal matrix tuav nws tag nrho ua ke. Txhua yam impurity lossis instability ntawm no yog qhov ua tsis tiav ntawm 1500 ° C +.
Peb ib zaug muaj teeb meem nrog cov av nkos tawg rau ntawm qhov loj, tiaj tus ntawm cov hlau stainless hlau phaj casting. Lub plhaub ntsia zoo ua ntej ncuav. Qhov teeb meem yog qhov thermal expansion tsis sib haum xeeb ntawm colloidal silica gel thiab refractory muab tub lim nyob rau hauv lub ntsej muag lub tsho. Lub binder nws tus kheej nyuaj dhau tom qab ziab. Cov kev daws teeb meem muab cov feem pua me me ntawm cov khoom sib txawv colloidal silica nrog kev hloov pauv particle morphology rau hauv peb cov slurry thawj. Nws tsim ib qho kev zam txim ntau dua gel network uas tuaj yeem ua kom haum rau thermal kev ntxhov siab yam tsis muaj kev tawg. Qhov no tsis yog txheej txheem txheej txheem. Nws yog ib qho kho tau yug los ntawm qhov tsim nyog.
Qhov kev hloov pauv ntawm cov khoom siv tshwj xeeb no yog qhov tseem ceeb. Nyob ntawm QSY website, lawv teev lawv cov hauj lwm nrog tshwj xeeb alloys. Txhua tus neeg hauv daim teb no paub cov lus hais qhia qhov tob, txhais tes-ntawm lub tsev qiv ntawv ntawm cov txheej txheem rau txhua tsev neeg cov khoom. Lub colloidal silica system rau ib tug cobalt alloy yuav muaj nuances piv rau ib tug qauv carbon hlau. Tej zaum nws yuav yog ib hom tshuaj sib txawv, sib xyaw sib txawv, lossis cov txheej txheem tswj cov slurry zoo.
Kev xav zaum kawg: Nws yog qhov system, tsis yog cov khoom xyaw
Yog li, qhwv qhov no, qhov tseem ceeb takeaway rau colloidal silica peev casting yog kom tsis txhob saib cov colloidal silica raws li ib qho khoom yuav khoom xwb. Nws yog lub hauv paus ntsiab lus ntawm ib tug rhiab, interdependent system. Cov quav ciab, lub ambient tej yam kev mob, refractory hmoov, stucco xuab zeb, kom qhuav raws tu qauv, thiab thaum kawg, lub alloy yog poured - lawv tag nrho cov tham nrog cov binder. Tus binder tus cwj pwm yog txoj hauv kev kawg.
Kev txawj ntse tiag tiag yog txhais cov cim. Kev hloov me ntsis hauv lub sijhawm slurry ntws. Qhov sib txawv me ntsis nyob rau hauv gloss ntawm ib lub tsho tiv no qhuav. Ib qho me me zog variation nyob rau hauv ib qho kev xeem raug rho tawm haujlwm. Cov no yog cov uas qhia rau koj yog tias koj tus txheej txheem tswj hwm. Nws yog empirical, qee zaum ntxhov siab li ntawd. Tsis muaj ib lo lus teb yog, tsuas yog ib lo lus teb rau koj lub khw tshwj xeeb, koj cov khoom siv, thiab koj cov khoom sib xyaw.
Tias yog vim li cas kev ua neej nyob ntev hauv kev lag luam no, zoo li 30-xyoo keeb kwm ntawm lub tuam txhab xws li QSY, yog lub teeb pom kev zoo. Nws txhais tau hais tias lawv tau dhau los ntawm cov teeb meem no, pom lawv cov kev daws teeb meem, thiab ua kom lawv cov txheej txheem ruaj khov. Rau leej twg nkag mus rau hauv qhov no, hwm cov txheej txheem colloidal silica. Kev nqis peev hauv kev ntsuas cov cuab yeej rau slurry tsis. Log txhua yam. Npaj kom koj txhais tes qias neeg thiab hloov kho. Qhov sib txawv ntawm cov nyiaj tau los thiab poob yog feem ntau nyob rau hauv cov kua mis dawb thiab koj xaiv los tswj nws li cas.
