Dab tsi ntxiv tuaj yeem ua rau kiln rooj tog

Nyob rau hauv lub ntiaj teb tshuaj, additives yuav muaj tseeb exert tej yam kev cuam tshuam rau lub ntsiab raw cov ntaub ntawv, uas muab peb qhov chaw ntxiv rau kev txhim kho peb cov khoom, tiag tiag, Hnub no, cia peb dhia mus rau hauv lub ntiaj teb no ntawm additives thiab saib yuav ua li cas kab additives ntawm LiCO3, txhuas, zircon thiab lwm yam yuav cuam tshuam qhov kev ua tau zoo ntawm cov khoom siv dav siv hauv cov rooj tog zaum: cordierite thiab corundum mullite. Nov yog kev xam phaj tshwj xeeb ntawm peb cov neeg ua haujlwm engineer John thiab Kim los ntawm peb tus neeg ua haujlwm hauv chaw ua haujlwm, Cathy.

1.Ib feem ntawm cov additives ntawm thermal expansion coefficient ntawm kiln rooj tog series --cordierite cov ntaub ntawv.

Kev sim 1:

Cathy: Yog li koj qhov kev sim thawj zaug yog dab tsi?

John: OK.Tau taub hau, cov tshuaj formula ntawm cordierite yog 2MgO·2Al2O3·5SiO2, thiab cov sim additives yog TiO2, TiCl4,Y2O3, thiab LiCO3. Peb qhov kev sim thawj zaug yog hais txog qhov cuam tshuam ntawm cov khoom ntxiv ntawm cov khoom cordierite. Nov yog qee cov duab qhia txog qhov cuam tshuam.

Tom qab ntxiv 1% ntawm TiO2:

Tom qab ntxiv 1% ntawm TiCl4:

Tom qab ntxiv 1% ntawm Y2O3:

Tom qab ntxiv 1% ntawm ZrO2

Tom qab ntxiv 1% ntawm LiCO3

Kim: TiO2, TiCl4, Y2O3, ZrO2, thiab LiCO3 tau ntxiv rau hauv cordierite raws li cov khoom siv ntxiv los kawm txog cov txiaj ntsig ntawm cov khoom sib txawv ntawm qhov nthuav dav ntawm cordierite. Cov txiaj ntsig tau pom tias qhov sib ntxiv ntawm TiO2, TiCl4 thiab ZrO2 tuaj yeem txo cov coefficient ntawm thermal expansion ntawm cov qauv. Lub expansion coefficient ntawm cordierite qauv nrog ntxiv ntawm Y2O3 thiab LiCO3 yog me me hauv qab no 100 degree, thaum nws yog saum toj no 100 degree, lub coefficient yog loj thiab nce nyob rau hauv ib tug ncaj kab thiab nws thiaj li tshaj qhov kawg coefficient ntawm expansion ntawm cov qauv khoom yam tsis muaj additives. .

John: Tseeb, cov txiaj ntsig tau pom tias TiCl4 yog qhov zoo tshaj plaws, tab sis qhov nthuav dav coefficient ntawm TiO2 zoo ib yam li TiCl4.

Kev sim 2:

Cathy: Tam sim no peb paub tias TiCl4 ntxiv yog qhov zoo tshaj plaws rau kev txhim kho thermal expansion coefficient ntawm 1%, koj puas tau sim ntxiv?

John: Tseeb tiag peb ua. Qhov kev sim thib ob tau ntsuas qhov feem pua ​​​​ntawm TiCl4 ua haujlwm zoo tshaj plaws thiab cov txiaj ntsig tau raws li hauv qab no:

Kim: Peb tau txheeb xyuas cov laj thawj tom qab cov txiaj ntsig. Ua ntej, cov qauv ntawm cordierite yog sparse thiab muaj qhov sib txawv loj hauv nruab nrab. Thaum qhov kub thiab txias, lub atom tuaj yeem vibrate mus rau qhov qhib ntawm cov qauv thiab muaj qhov sib txawv hauv cov qauv. Yog li ntawd, nyob rau hauv ib tug tej yam kub ntau yam, nws qhia tau hais tias ib tug qis thermal expansion.

John: Yog lawm, thiab qhov thib ob, cordierite tsim kev ntxhov siab thiab khaws cia lub zog hauv cov siv lead ua thaum sintering thiab txias. Yog tias qhov no txaus los tiv thaiv qhov nce ntawm lub zog saum npoo los ntawm kev pib tawg, cov ciam teb lossis cov nplej yuav tawg, ua rau microcracks tsim hauv lawv. Raws li qhov kub thiab txias nce ntxiv, thiab ntau thiab ntau micro tawg raug kaw nyob rau hauv cov khoom, muaj tsawg thiab tsawg micro tawg, uas yog vim li cas cov coefficient ntawm thermal expansion nce maj mam.

Cathy: Ua tsaug rau koj, hais mav, yog li txhawm rau txheeb xyuas, cov txiaj ntsig tau pom tias qhov nthuav dav coefficient ntawm cordierite qauv yog qhov zoo tshaj plaws thaum ntxiv 4% ntawm TiCl4.

2. Kev cuam tshuam ntawm cov khoom ntxiv rau thermal shock kuj ntawm kiln rooj tog series 2-- corundum mullite cov ntaub ntawv

Kev sim 1:

Cathy: Kub kub kiln rooj tog ntawm corundum-mullite cov ntaub ntawv yog dav siv rau nws siab melting point, zoo creep kuj thiab thermal shock kuj. Txhawm rau txhim kho nws cov khoom, cia peb hnov ​​​​qhov peb cov engineers tau ua.

John: peb thov andalusite, phaj corundum, alumina hmoov thiab silica hmoov raws li raw cov ntaub ntawv raws li kev taw qhia ntawm kev hloov cov yas theem technology. Cov teebmeem ntawm ob qhov sib txawv ntawm cov khoom ntawm corundum-mullite cov ntaub ntawv tau kawm los ntawm kev ntxiv 0, 1%, 2% thiab 3% aluminium lossis silicon, raws li.

Kim: Cov teebmeem ntawm aluminium thiab silicon ntawm qhov ntom, lub zog, toughness thiab thermal shock kuj ntawm corundum-mullite cov ntaub ntawv tau kawm. Nws tau pom tias qhov sib ntxiv ntawm txhuas thiab silicon rau corundum-mullite cov ntaub ntawv tuaj yeem tsim cov pwm yas, thiab tau oxided nrog lawv cov tshuaj valence qub hauv cov txheej txheem sintering uas ua rau tsim cov oxide txhaws ib feem ntawm qhov pores. Nws tau txais txiaj ntsig los txo qhov pom meej porosity ntawm cov khoom, thiab cov mullite crystals tsim yog cov qauv zoo li rab koob, kev sib tshuam, kev sib txuas thiab kev sib txuas, uas pab txhim kho lub zog, toughness thiab thermal shock resistance ntawm cov khoom.

John: Txawm li cas los xij, qhov sib ntxiv ntawm ob qho tshuaj ntxiv txo qhov ntim ntawm cov khoom siv vim tias cov additives tsis ntom. Sib piv cov txiaj ntsig ntawm txhuas thiab silicon ntawm cov khoom ntawm corundum-mullite cov ntaub ntawv, nws tau pom tias txhuas muaj cov yas zoo dua thiab qis melting point dua li silicon, thiab nws pab txhim kho cov rooj tog zaum hauv qhov cub kom lub zog, toughness thiab thermal shock kuj zoo dua li ntawm. silicon.

Kev sim 2:

John: Yog li peb kuj tau ua lwm yam kev sim siv fused mullite li coarse hais, -al2o3 hmoov, sillimanite hmoov thiab ib qho me me ntawm cov av nplaum sib txuas ua matrix, thiab carboxymethyl cellulose li binder. Cov kws tshawb fawb ntxiv titanium dioxide hmoov thiab zircon hmoov raws li thiab tom qab ntawd ntxiv ob hom hmoov no tib lub sijhawm. Tom qab sib tov, hydroforming, cov kabmob phaj cov qauv raug rho tawm ntawm 1530 degree rau 2 teev. Kim: Peb pab pawg tau siv fused dawb corundum thiab mullite ntawm cov khoom nruab nrab raws li kev txheeb xyuas cov txiaj ntsig ntawm kev sib ntxiv ntawm titanium dioxide (4%, 6%, 8%), ntxiv ntawm zircon hmoov (4%, 6%, 8%). thiab ib txhij ntxiv ntawm ob hmoov (zircon hmoov 6%, titanium dioxide 4%, 6%, 8%) ntawm thermal shock resistance ntawm bearing phaj.

John: Cov txiaj ntsig tau pom tias thermal poob siab tsis kam ntawm corundum cov qauv ntawm cov khoom nruab nrab yog zoo dua li cov qauv ntawm mullite, thiab cov thermal shock kuj ntawm cov qauv nrog zircon hmoov los yog titanium dawb hmoov tau txhim kho pom tseeb. Thaum ob qho tib si ntxiv ib txhij, qhov thermal shock kuj ntawm cov qauv tau txhim kho zoo heev.

Kim: SEM tsom xam pom tias lub zircon theem yog precipitated los ntawm kev ntxiv zircon hmoov, txhuas titanate yog tsim los ntawm kev ntxiv titanium dioxide, zircon theem thiab txhuas titanate crystals tau tsim los ntawm kev ntxiv zircon hmoov thiab titanium dioxide. Qhov muaj nyob ntawm cov theem no tau ua rau microcracks thiab intergranular tawg, uas yog pab tau los txhim kho thermal poob siab.

Cathy: Txij li thaum muaj ntau yam teebmeem ntawm cov khoom siv ntxiv rau kev ua haujlwm ntawm cov khoom siv ceramic, nrog rau cov khoom siv sintered, peb tau ua R & D los txhim kho peb cov khoom thaum nrhiav kev daws teeb meem zoo dua kom tau raws li peb cov neeg siv khoom xav tau.

Tam sim no peb muab thawj KF thiab theem nrab KF. BATTS, SiC beams, props, saggers, crucibles, nkoj thiab daim hlau ntawm ntau qhov ntau thiab tsawg thiab cov duab yog tag nrho hauv peb qhov kev tsim khoom raws li kev hais lus. Thov hu rau peb thiab peb yuav cog lus los muab peb cov kev pabcuam zoo tshaj plaws rau koj.