Rau Titanium Hluav taws xob rhaub siv los yaj A 50/50 Eutectic ntsev (NaCl-KCl) ntawm 700 degree, Vim li cas tuab (5 Μm) Anodized Oxide Layer Detrimental, Thaum nyias (0.2 Μm) Ntuj Oxide muab kev tiv thaiv txaus rau Sever?
Tso lus
Ntawm 700℃nyob rau hauv molten NaCl-KCl eutectic ntsev, titanium tsim ib tug natural oxide (0.1-0.3 µm) uas hlob qeeb thiab nyob twj ywm. Lub tuab anodized oxide (5 µm) muaj cov kev ntxhov siab sab hauv thiab micro- tawg los ntawm cov txheej txheem anodizing. Nyob rau ntawm 700 degree, cov tuab oxide spalls vim thermal expansion mismatch, nthuav tawm titanium tshiab rau oxidation sai. Lub ntuj oxide nyias, loj hlob hauv kev pabcuam, yog qhov ua tau zoo dua thiab ua kom tsis muaj zog{10}}tiv taus.
Quantitative Oxide Spalling vs. Initial Thickness
Nyob rau hauv molten NaCl -KCl ntawm 700 degree, thermal cycles (25℃→ 700℃→ 25℃):
| Thawj Oxide Thickness (µm) | Oxide Source | Cycles rau Spalling | Hlau poob ib 100 voj voog (µm) |
|---|---|---|---|
| 0.1 (natural) | Hauv -situ loj hlob | >100 | 5–10 |
| 0.2 (natural) | Hauv -situ loj hlob | >100 | 5–10 |
| 1.0 (thermal, 400℃cua) | Ua ntej -oxidized | 20–40 | 20–50 |
| 3.0 (Anodized) | Anodizing | 5–15 | 50–100 |
| 5.0 (Anodized) | Anodizing | 3–8 | 100–200 |
| 10.0 (Anodized) | Anodizing | 1–3 | 200–500 |
Cov nyhuv ntawm ntsev muaj pes tsawg leeg ntawm Oxide Stability
| Ntsev Composition | Ntuj Oxide Lub Neej (Cycle) | Anodized Oxide (5 µm) Lub neej ( voj voog) |
|---|---|---|
| NaCl-KCl (50/50) | >100 | 3–8 |
| NaCl-KCl + 5% MgCl₂ | 50–100 | 2–5 |
| NaCl-tsuas | 100–200 | 5–10 |
Oxide Preparation Guide for Molten Salt Service
| Desired Service Life (cycles) | Pom zoo pib Oxide | Txoj Kev Npaj |
|---|---|---|
| <10 | Ib qho | Tsis pom zoo rau cov phab ntsa nyias |
| 10–30 | Ntuj los yog<1 µm thermal | Pickled nkaus xwb |
| 30–100 | Ntuj (hauv -situ zus) | Kev loj hlob ntawm kev pabcuam nkaus xwb |
| >100 | Ntuj + tswj cua sov-nce | Slow ramp mus rau 700 degree |
Kev pom zoo engineering
Rau molten chloride ntsev kev pab ntawm 700 degree, tsis txhob anodized los yog tuab pre- tsim oxides. Txhim kho lub tshuab cua sov hauv qhov chaw khaws cia thiab tso cai rau lub ntuj oxide loj hlob thaum lub sijhawm ua haujlwm nrog lub zog pib qeeb -nce (2℃/ min). Los ntawm kev siv lub ntuj oxide nyias, tus engineer tiv thaiv spalling thiab txuas lub neej ntawm cov cua sov.
