Silicon Nitride e tlamiloeng ka Silicon Carbide Thermocouple Protection Tube: Thebe e Hloahloa bakeng sa Tekanyo ea Mocheso oa Liindasteri

Li-thermocouple ke mokokotlo oa tlhokomelo ea mocheso lits'ebetsong tse ngata tsa indasteri—ho tloha ho qhibilihiseng tšepe ho ea ho motsoako oa lik'hemik'hale. Leha ho le joalo, ts'ebetso ea tsona le nako ea tsona ea bophelo li itšetlehile ka botlalo ka karolo e le 'ngoe ea bohlokoa: tube ea tšireletso. Libakeng tse thata tsa indasteri, li-tube tsa tšireletso tsa thermocouple tsa setso (tse entsoeng ka tšepe, alumina, kapa silicon carbide e hloekileng) hangata li hlōleha ho mamella mocheso o feteletseng, mecha ea phatlalatso e senyang, kapa likaroloana tse khorofo. Sena se lebisa ho nkeloang sebaka ha thermocouple khafetsa, data e fosahetseng ea mocheso, le nako e jang nako ea tlhahiso.​

Haeba o khathetse ke ho sekisetsa botšepehi ba thermocouple,Li-Tubes tsa Tšireletso ea Thermocouple tse Tšireletsoang ke Silicon Nitride tse Kopantsoeng le Silicon Carbide (NSiC)ke tharollo e fetolang papali eo u e hlokang. Li entsoe ho sireletsa li-thermocouple maemong a thata ka ho fetisisa, li-tube tsa NSiC li netefatsa ho lemoha mocheso ka mokhoa o tsitsitseng le o nepahetseng ha li ntse li eketsa bophelo ba ts'ebeletso ea lisebelisoa tsa hau tsa ho lekanya tsa bohlokoa.​

Hobaneng ha Silicon Nitride e tlamiloeng ka Silicon Carbide e hlahella bakeng sa Tšireletso ea Thermocouple

Li-tube tsa tšireletso ea thermocouple li hloka tekano e ikhethang ea thepa: ho hanyetsa mocheso, ho hanyetsa mafome, matla a mechini, le ho tsamaisa mocheso. NSiC e ipabola libakeng tsena kaofela, e sebetsa hantle ho feta thepa ea setso ho tekanyo e 'ngoe le e 'ngoe ea bohlokoa:

1. Khanyetso e Feteletseng ea Mocheso bakeng sa Kutlo e sa Sitisoeng​

Li-thermocouple liindastering tse kang tlhahiso ea khalase kapa ho lahla tšepe li sebetsa mochesong o fetang 1,500°C. Li-tube tsa tšireletso ea thermocouple tsa NSiC li sebetsana le sena habonolo—li ithorisa ka mocheso o tsoelang pele oa ho sebetsa oa ho fihlela ho 1,600°C (2,912°F) le ho hanyetsa ka nako e khuts'oane ho 1,700°C (3,092°F). Ho fapana le li-tube tsa tšepe tse oxidizeng kapa tse qhibilihang, kapa li-tube tsa alumina tse petsohang tlas'a ho phatloha ha mocheso, NSiC e boloka botsitso ba sebopeho esita le nakong ea ho feto-fetoha ha mocheso ka potlako. Sena se bolela hore thermocouple ea hau e lula e sirelelitsoe, 'me data ea mocheso oa hau e lula e nepahetse—ho sa tsotelehe hore na mocheso o matla hakae.​

2. Khanyetso e Phahameng ea Mafome ho Sireletsa Khahlanong le Mecha ea Litaba e Mabifi​

Mekhoa ea indasteri hangata e pepesetsa li-thermocouple litšepeng tse qhibilihisitsoeng (aluminium, zinki, koporo), litharollo tsa asiti/alkaline, kapa likhase tse senyang (sulfur dioxide, chlorine). Sebopeho se teteaneng sa NSiC, se kopantsoeng le nitride se etsa mokoallo o sa keneng khahlanong le lintho tsena. Ho fapana le lipeipi tse hloekileng tsa silicon carbide, tse kotsing ea ho oxidation libakeng tse mongobo tse nang le mocheso o phahameng, sebopeho se ikhethang sa NSiC se ntlafatsa khanyetso ea oxidation - ho netefatsa hore thermocouple ea hau e lula e sirelelitsoe ho mafome ka lilemo. Sena se bohlokoa bakeng sa lits'ebetso tse kang ts'ebetso ea lik'hemik'hale, ho chesoa ha litšila, le ho hlophisoa ha thepa ea betri.​

3. Matla a Ikhethang a Mechini a ho Mamella ho Tshoa le ho Tshwaetswa​

Li-thermocouple lifemeng tsa samente, liteisheneng tsa motlakase, kapa lits'ebeletsong tsa ts'ebetso ea liminerale li tobana le litšokelo tse sa khaotseng: lerōle le matla, likaroloana tse fofang, le tšusumetso ea mechini. Li-tube tsa tšireletso ea thermocouple tsa NSiC li hahiloe ho hanela liphephetso tsena, ka matla a ho kobeha a fetang 300 MPa le boima ba Vickers (HV10) ba ≥ 1,800. Sena se etsa hore li tšoarelle ka makhetlo a 3-5 ho feta li-tube tsa setso, e leng se fokotsang tlhoko ea ho nkeloa sebaka khafetsa. Bakeng sa ts'ebetso ea hau, sena se bolela nako e fokolang ea ho se sebetse, litšenyehelo tse tlase tsa tlhokomelo, le ts'ebetso e tšepahalang haholoanyane ea thermocouple.​

4. Phepelo e ntle ea mocheso bakeng sa ho bala ka potlako le ka nepo​

Boleng ba thermocouple bo itšetlehile ka bokhoni ba eona ba ho arabela ka potlako liphetohong tsa mocheso. Ho khanna ha mocheso oa NSiC (60–80 W/(m·K)) ho phahame haholo ho feta ha lipeipi tsa alumina kapa tsa tšepe, ho nolofalletsa phetiso e potlakileng ea mocheso ho tloha ts'ebetsong ho ea ho thermocouple conjunction. Sena se netefatsa hore thermocouple ea hau e fana ka data e nepahetseng ea nako ea sebele—ea bohlokoa bakeng sa ho boloka taolo ea ts'ebetso le boleng ba sehlahisoa. Ho feta moo, coefficient e tlase ea katoloso ea mocheso oa NSiC (3.5–4.5 × 10⁻⁶/°C) e fokotsa khatello ea mocheso, e thibela mapetso a ka sitisang ho nepahala ha tekanyo.​

5. Nako e Telele e Sebetsang ka Litšenyehelo Bakeng sa Litšenyehelo tse Tlase tsa Beng ba Thepa​

Leha lipeipi tsa tšireletso ea thermocouple tsa NSiC li ka ba le matsete a holimo a pele ho feta likhetho tsa setso, bophelo ba tsona ba tšebeletso e telele (lilemo tse 2-5 maemong a thata) le litlhoko tse fokolang tsa tlhokomelo li fana ka poloko e kholo ea nako e telele. Ka ho fokotsa makhetlo a ho nkela thermocouple sebaka le nako ea tlhahiso e sa sebetseng, NSiC e fokotsa litšenyehelo tsa hau tsohle tsa beng (TCO) mme e eketsa phaello ea hau ea matsete (ROI). Bakeng sa lifeme tsa indasteri tse batlang ho ntlafatsa katleho, ena ke khetho e bohlale, e sireletsang bokamoso.​