Temir xrom alyuminiy (FeCrAl) qotishmalari odatda maksimal ish harorati 1,400 ° C (2,550 ° F) gacha bo'lgan ilovalarda ishlatiladigan yuqori qarshilikli materiallardir.
Ushbu ferrit qotishmalari sirtni yuklash qobiliyatiga, yuqori qarshilikka va past zichlikka ega ekanligi ma'lum.Nikel xrom(NiCr) muqobillari, ular qo'llashda kamroq material va vaznni tejashga olib keladi. Yuqori maksimal ish harorati ham elementning ishlash muddatini uzaytirishi mumkin. Temir xrom alyuminiy qotishmalari 1000 ° C (1832 ° F) dan yuqori haroratlarda ochiq kulrang alyuminiy oksidi (Al2O3) hosil qiladi, bu korroziyaga chidamliligini oshiradi, shuningdek, elektr izolyatori sifatida ishlaydi. Oksid hosil bo'lishi o'z-o'zidan izolyatsiya qilingan deb hisoblanadi va metall bilan metall bilan aloqa qilganda qisqa tutashuvdan himoya qiladi. Temir xrom alyuminiy qotishmalari nisbatan kamroq mexanik kuchga egaNikel xrommateriallar, shuningdek, pastroq emirilish kuchi.
Baho | 1Cr13Al4 | TK1 | 0Cr25Al5 | 0Cr20Al6RE | 0Cr23Al5 | 0Cr19Al3 | 0Cr21Al6Nb | 0Cr27Al7Mo2 | |
Nominal tarkibi% | Cr | 12,0-15,0 | 22,0-26,0 | 23,0-26,0 | 19,0-22,0 | 22,5-24,5 | 18,0-21,0 | 21,0-23,0 | 26,5-27,8 |
Al | 4,0-6,0 | 5,0-7,0 | 4,5-6,5 | 5,0-7,0 | 4,2-5,0 | 3.0-4.2 | 5,0-7,0 | 6,0-7,0 | |
Re | qulay | 0,04-1,0 | qulay | qulay | qulay | qulay | qulay | qulay | |
Fe | Bal. | Bal. | Bal. | Bal. | Bal. | Bal. | Bal. | ||
Nb0.5 | Mo1.8-2.2 | ||||||||
Maksimal ish harorati (°C) | 650 | 1400 | 1250 | 1250 | 1250 | 1100 | 1350 | 1400 | |
Qarshilik 20℃(Ō/mm2/m) | 1.25 | 1.48 | 1.42 | 1.40 | 1.35 | 1.23 | 1.45 | 1.53 | |
Zichlik (g/sm³) | 7.4 | 7.1 | 7.1 | 7.16 | 7.25 | 7.35 | 7.1 | 7.1 | |
20 ℃ da issiqlik o'tkazuvchanligi, Vt/(M·K) | 0,49 | 0,49 | 0,46 | 0,48 | 3.46 | 0,49 | 0,49 | 0,49 | |
Chiziqli kengayish koeffitsienti (×10¯6/℃)20-1000℃) | 15.4 | 16 | 16 | 14 | 15 | 13.5 | 16 | 16 | |
Taxminiy erish nuqtasi (℃) | 1450 | 1520 | 1500 | 1500 | 1500 | 1500 | 1510 | 1520 | |
Kuchlanish kuchi (N/mm2) | 580-680 | 680-830 | 630-780 | 630-780 | 630-780 | 600-700 | 650-800 | 680-830 | |
Uzayish (%) | ›16 | ›10 | ›12 | ›12 | ›12 | ›12 | ›12 | ›10 | |
Bo'lim o'zgarishining qisqarish darajasi (%) | 65-75 | 65-75 | 60-75 | 65-75 | 65-75 | 65-75 | 65-75 | 65-75 | |
Takroriy egilish chastotasi (F/R) | ›5 | ›5 | ›5 | ›5 | ›5 | ›5 | ›5 | ›5 | |
Qattiqligi (HB) | 200-260 | 200-260 | 200-260 | 200-260 | 200-260 | 200-260 | 200-260 | 200-260 | |
Mikrografik tuzilma | Ferrit | Ferrit | Ferrit | Ferrit | Ferrit | Ferrit | Ferrit | Ferrit | |
Magnit xususiyat | Magnit | Magnit | Magnit | Magnit | Magnit | Magnit | Magnit | Magnit | |
Tez hayot (h/℃) | no | ≥80/1350 | ≥80/1300 | ≥80/1300 | ≥80/1300 | ≥80/1250 | ≥50/1350 | ≥50/1350 |
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