Feem ntau castables yog tsim los rau insulate. Silicon carbide castable yog txawv - nws yog tsim los coj, tiv taus hnav, thiab tiv thaiv tshuaj tua kab mob ib txhij.
Yog tias koj lub qhov cub hluav taws xob ua tsis tiav los ntawm kev puas tsuaj ntau dua li ntawm melting, yog tias koj lub tshuab hluav taws xob xav tau cov khoom siv uas tuaj yeem hloov cov cua sov ntawm 1200 degree, lossis yog tias koj lub qhov cub tawg hauv ob sab phlu poob rau lub neej kev sib tw rau alkali vapor nres - SiC castable yog qhov koj tab tom saib.
Cov lus qhia no suav nrog kev sib koom ua ke, cov ntsiab lus tseem ceeb, qhov twg nws ua haujlwm thiab qhov twg nws tsis, thiab seb peb muab qhov twg thiab sim txhua pawg.
Vim li cas Silicon Carbide Castable? Dab tsi ua rau nws txawv
Ntawm no yog qhov tseem ceeb ntawm kev lag luam tawm.High alumina castableyog xaiv thaum koj xav tau thermal conductivity tsawg - koj tab tom sim ua kom sov hauv qhov cub. Silicon carbide castable yog xaiv thaum koj xav tau thermal conductivity, siab hnav tsis kam, los yog ob qho tib si.
Peb tus lej uas piav qhia qhov txawv:
Thermal conductivity:SiC castable: 8-18 W/m·K ntawm 1000℃. 80% Al₂O₃ castable: 2.0–2.5 W/m·K. SiC hloov cov cua sov 4-8 × sai dua - qhov tseem ceeb hauv qhov cub tawg cua txias qhov chaw koj xav tau lub plhaub kom txias.
Abrasion tsis kam:SiC hardness yog Mohs 9-9.5. Rau kev siv, corundum (Al₂O₃) yog Mohs 9. Tab sis SiC tuav nws cov tawv tawv ntawm qhov kub siab zoo dua, ua rau nws nyiam xaiv nyob rau hauv cov cheeb tsam uas muaj kev cuam tshuam loj heev - cement kiln txias zones, incinerator grate.
Alkali tsis kam:SiC tsim ib txheej SiO₂ passive nyob rau hauv oxidizing tej yam kev mob, tiv thaiv alkali vapor nres nyob rau hauv lub moj tej tawg rauv rau sab sauv cheeb tsam. High alumina castable corrodes nce nyob rau hauv K₂O thiab Na₂O vapor saum 1000 degree.
Ib qho kev ncaj ncees caveat: SiC oxidizes nyob rau hauv oxidizing muaj zog tshaj 1400 degree. Yog tias koj daim ntawv thov yog cov ntshiab oxidizing cua ntawm qhov kub thiab txias uas tsis muaj kev xav tau ntawm cov khoom siv, cov alumina siab yog ruaj khov thiab pheej yig dua.
Bonding Systems: Oxide-Bonded vs Nitride-Bonded vs Si₃N₄-SiC
Lub kaw lus sib txuas txiav txim siab qhov castable tus cwj pwm ntawm qhov kub thiab txias hauv cov cua sib txawv.
Oxide-bonded SiC castable:Siv Al₂O₃ lossis SiO₂ ua lub sijhawm sib txuas. Ua los ntawm kev tua hluav taws hauv oxidizing cua. Qhov zoo tshaj plaws rau: cement kiln txias zones, incinerator grates, non-ferrous hlau furnaces. Max kev pab kub: 1400-1500 degree. Tus nqi: qis tshaj hauv tsev neeg SiC.
Nitride-bonded SiC castable (Si₃N₄ bonded):Cov theem kev sib txuas yog silicon nitride, tsim los ntawm nitriding cov tshuaj tiv thaiv thaum tua nyob rau hauv cov cua nitrogen. Qhov zoo tshaj plaws rau:blast furnace refractorytuyere thiab taphole cheeb tsam, aluminium tiv tauj zones, daim ntaub ntawv thov kom siab zog ntawm 1400-1600 degree. Superior thermal shock resistance vs. oxide-bonded. Tus nqi: 30-50% premium tshaj oxide-bonded.
SiC-SiC castable: High SiC content (>70%) nrog SiC-raws li matrix. Siv nyob rau hauv feem ntau xav tau abrasion thiab thermal conductivity daim ntaub ntawv. Kev cai formulation, ntev txhuas lub sij hawm.
| Hom kev sib cog lus | SiC% Ntau | Max kub (degree) | Thermal Cond. @1000 degree | Huab cua zoo tshaj |
|---|---|---|---|---|
| Oxide-bonded | 30–60 | 1450 | 8–12 W/m·K | Oxidizing / nruab nrab |
| Nitride-bonded (Si₃N₄) | 50–75 | 1600 | 12–16 W/m·K | Txo / nruab nrab |
| SiC-SiC sib xyaw | 70–85 | 1700 | 15–18 W/m·K | Nruab nrab / inert |
Cov ntsiab lus tseem ceeb los ntawm SiC Cov Ntsiab Lus Qib
| Khoom | 40% SiC | 60% SiC | 75% SiC |
|---|---|---|---|
| SiC cov ntsiab lus (%) | 38–42 | 58–62 | 73–77 |
| Qhov ceev (g / cm³) | 2.55–2.70 | 2.65–2.80 | 2.75–2.90 |
| Pom tseeb porosity (%) | 14–18 | 12–16 | 10–14 |
| CCS @ 110℃(MPa) | 60–90 | 80–110 | 100–140 |
| CCS @ 1000℃(MPa) | 80–110 | 100–140 | 120–160 |
| Flexural zog @ 1000℃(MPa) | 12–18 | 18–25 | 22–32 |
| Thermal conductivity @ 1000℃(W / m·K) | 8–10 | 12–14 | 15–18 |
| Max kev pab kub (degree) | 1450 | 1500 | 1600 |
Daim ntawv thov thaj chaw uas SiC Castable Outperforms siab Alumina
Blast Rauv Tuyere Zone
Nov yog daim ntawv thov tseem ceeb rau SiC castable. Lub cheeb tsam tuyere pom 1300-1500 degree, txo qhov cua, siab tshaj tawm kub kub (cua + coke gas), thiab abrasive coke hais. Oxide-bonded SiC tawm tsam ntawm no - nitride-bonded Si₃N₄-SiC yog tus qauv xaiv.
Kev txhim kho lub neej peb tau sau tseg: ib lub teb chaws Asia steel zeb hloov los ntawm 70% Al₂O₃ castable rau nitride-bonded 60% SiC. Tuyere cheeb tsam relining ncua ncua sij hawm los ntawm 8 lub hlis mus rau 18 lub hlis.
Khib thiab Kho Mob Incinerator Grate
High abrasion los ntawm cov khoom pov tseg + HCl thiab SO₂ corrosive gases + thermal cycling. Oxide-bonded 40-60% SiC tswj qhov chaw no zoo dua li alumina siab. SiO₂ passive txheej tiv thaiv chloride nres.
Cement Kiln Cooling Zone
Qhov chaw txias txias pom 600-1000℃nrog siab clinker plua plav abrasion thiab thermal cycling . 40-60% SiC oxide-bonded castable yog tus qauv rau cov phab ntsa txias thiab grate castings. Qhov twg tus qauv siab alumina castable kav 6-9 lub hlis, SiC feem ntau ua tiav 18-24 lub hlis.
Aluminium Melting thiab Tuav Rauv
Molten aluminium tawm tsam siab alumina castable los ntawm kev txo qis (Al₂O₃ + Al → Al₂O + AlO). SiC yog resistant rau txhuas yaj tawm tsam thiab yog cov khoom siv hauv ob sab phlu rau cov chaw tiv tauj txhuas. Lus Cim: rau aluminium ladle linings, sab laj peb txog qib tshwj xeeb - huab cua thiab qhov kub thiab txias cuam tshuam rau SiC xaiv.
Kub Exchanger thiab Recuperator Tubes
Rau cov pa roj-rau-gas lossis roj-rau-kua hluav taws kub exchangers ua haujlwm siab tshaj 1000 degree, SiC castable muab cov thermal conductivity uas yuav tsum tau ua kom cov cuab yeej ua haujlwm. Standard refractory castable yog ib yam nkaus thiab insulating ua hauj lwm ntawm no.Mixing, vibration thiab curing raws tu qauv
SiC castable ua raws li cov qauv kev teeb tsa zoo sib xws rau siab alumina castable, nrog ob qhov sib txawv tseem ceeb:
Ntxiv dej:SiC castable tsis tshua zam txim rau dej piv vim tias SiC hais tsis sib raug zoo nrog cov cement tib yam li alumina ua. Nyob tsis pub dhau ± 0.5% ntawm qhov ntsuas dej ntsuas.
| Qib | Ntxiv dej (% ntawm qhov hnyav qhuav) |
|---|---|
| Oxide-bonded 40% SiC | 6.0–7.5% |
| Oxide-bonded 60% SiC | 5.5–7.0% |
| Nitride-bonded 60% SiC | 5.0–6.5% |
Mixing lub sij hawm:4-6 feeb nyob rau hauv yuam-action tov khoom. SiC aggregate yuav tsum tau sib tov lub sij hawm ntau dua li cov ntshiab alumina castables kom ua tau raws li kev faib tawm.
Dry-out nkhaus:
| Theem | Kub | Tus nqi | Tuav |
|---|---|---|---|
| 1 | Ambient → 120 degree | 15℃/ teev | 8 hrs |
| 2 | 120℃→ 400 degree | 20℃/ teev | 4 hrs |
| 3 | 400℃→ 700 degree | 25℃/ teev | 2 hrs |
| 4 | 700℃→ Ua haujlwm | 30-50℃/ teev | Raws li txheej txheem |
Atmosphere daim ntawv rau nitride-bonded SiC:Thawj qhov kub-txog 600℃hauv huab cua yog qhov zoo. Tshaj 700 degree, yog tias ua tau, hloov mus rau nitrogen lossis txo qhov cua kom khaws Si₃N₄ kev sib txuas theem.
Kev Tswj Xyuas Zoo - SiC Purity Verification
SiC cov ntsiab lus yog qhov uas muaj kev pheej hmoo hloov pauv siab tshaj plaws. Lub castable sau tias "60% SiC" tuaj yeem muaj tsawg li 45% SiC yog tias tus neeg muag khoom sib xyaw hauv cov qib qis silicon lossis silicon oxycarbide muab tub lim.
Peb QC raws tu qauv rau txhua batch:
XRD theem tsom xam: lees paub SiC polymorph (vs.) thiab kuaj pom oxide filler paug
XRF elemental tsom xam: txheeb xyuas Si thiab C cov ntsiab lus, kuaj xyuas cov kab mob hlau (Fe₂O₃ lub hom phiaj <1.5%)
Kev txheeb xyuas qhov ntom ntom: 100% ntawm lub hnab ntim khoom ntau
CCS tom qab 1000℃firing: coj los ntawm txhua 5-tuj ntau lawm batch
Peb muab QC daim ntawv pov thawj nrog ntau cov ntaub ntawv taug qab ntawm txhua qhov khoom xa tuaj. Thov qhov no ua ntej xaj - txhua tus neeg xa khoom uas yuav tsis muab cov ntaub ntawv QC qib batch yog qhov txaus ntshai.
Yuav Thov Li Cas: MOQ, Nqe & Lub Sijhawm Ua Haujlwm
Kev Siv Tus Nqi (2025, FOB Qingdao)
| Qib | Nqe ib metric tons (USD) |
|---|---|
| Oxide-bonded 40% SiC | 680–850 |
| Oxide-bonded 60% SiC | 950–1,200 |
| Nitride-bonded 60% SiC | 1,400–1,800 |
| 75% SiC sib xyaw | 1,800–2,400 |
MOQ:2 metric tons (tus qauv qib). Kev cai formulations: 5 metric tons.
Lub sijhawm ua:Qib Tshuag (oxide-bonded 40/60%): 10-15 hnub. Nitride-bonded qib: 20-30 hnub (ntau lawm rau kev txiav txim). Kev Cai SiC-SiC: 35-45 hnub.
Ntim:25 kg ntawm noo noo-pov thawj hnab ntawm ntoo pallets. Export-standard wrapping rau hiav txwv freight.
Cov lus nug nquag
Dab tsi yog qhov kev pabcuam siab tshaj plaws rau silicon carbide castable?
Qhov kev pabcuam kub siab tshaj plaws nyob ntawm hom kev sib txuas. Oxide-bonded SiC castable: 1400-1500 degree. Nitride-bonded Si₃N₄-SiC: 1550-1600 degree. SiC-SiC composite: mus txog 1700 degree. Saum toj no cov kub los yog nyob rau hauv lub zog oxidizing tej yam kev mob, SiC oxidizes thiab poob txhua yam muaj zog. Paub meej tias koj lub qhov cub cua sov thiab qhov kub siab tshaj plaws ua ntej xaiv qib.
Puas yog silicon carbide castable haum rau cov ntawv thov kev tiv tauj txhuas?
Yog lawm, tab sis kev xaiv qib tseem ceeb. SiC tiv thaiv txhuas yaj tawm tsam zoo dua li siab alumina castable. Rau cov chaw tiv tauj txhuas, siv oxide-bonded SiC nrog SiC% siab tshaj 60% thiab xyuas Fe₂O₃ cov ntsiab lus hauv qab 1.5% kom tsis txhob muaj hlau paug ntawm txhuas yaj. Peb tuaj yeem muab daim ntawv pov thawj muaj pes tsawg leeg tshwj xeeb rau kev lag luam aluminium.
SiC castable piv rau siab alumina castable li cas?
SiC castable nqi 1.5–3 × ntau tshaj qhov sib npaug-hnyav 80% Al₂O₃ castable nyob ntawm qib. Txawm li cas los xij, kev sib piv cov nqi yuav tsum tau ua raws li ib qho kev sib tw. Hauv thaj chaw muaj kev puas tsuaj loj, SiC feem ntau xa 2-3 × lub neej kev sib tw ntev dua - tag nrho cov nqi ib xyoo ua haujlwm feem ntau tawm qis dua.
Puas yog silicon carbide castable siv tau rau hauv oxidizing cua?
Oxide-bonded SiC castable tuaj yeem siv rau hauv oxidizing cua mus txog 1400 degree. Tshaj 1400℃nyob rau hauv muaj zog oxidizing tej yam kev mob, SiC oxidizes rau SiO₂, uas yuav ua rau lub ntim hloov thiab degradation ntawm cov qauv. Nitride-bonded qib yog rhiab heev rau oxidizing atmospheres - kom qis dua 1200℃hauv huab cua tshwj tsis yog tias tus qauv tsim tso cai rau kev tswj hwm huab cua.
