Detailed analysis of heat principle of graphite rod

Detailed analysis of heat principle of graphite rod

Graphite tsvimbo inowanzoshandiswa seyoelectric heater of high-temperature vacuum furnace. Zviri nyore kuita oxidize pakupisa kwakanyanya. Kunze kwevacuum, inogona kushandiswa chete munzvimbo isina kwayakarerekera kana kuderedza mhepo. Iine diki coefficient yekuwedzera kwekupisa, hombe yekupisa conductivity, yakakwirira tembiricha kuramba, kutonhora kwakanyanya uye kupisa kwakanyanya, uye mutengo wakaderera. Iyo oxidation rate uye volatilization rate yegraphite inokanganisa hupenyu hwebasa rejenareta rinopisa. Kana nzvimbo yechokwadi iri 10-3 ~ 10-4 mmHg, tembiricha yebasa inofanira kunge iri pasi pe2300 ℃. Mumamiriro ekudzivirira (H2, N2, AR, nezvimwewo), tembiricha yebasa inogona kusvika 3000 ℃. Graphite haigone kushandiswa mumhepo, zvikasadaro ichave oxidized uye inopedzwa. Inopindirana zvakasimba neW pamusoro pe1400 ℃ kugadzira carbides.
Iyo graphite tsvimbo inonyanya kuumbwa negraphite, saka isu tinogona zvakare kunzwisisamaitiro egraphite:
Iyo yekunyunguduka kwegraphite yakakwirira kwazvo. Inotanga kupfava uye inoita kunyungudika kana yasvika 3000C pasi pevacuum. Pa 3600c, graphite inotanga kubuda uye kuderera. Simba rezvinhu zvakajairika zvishoma nezvishoma rinoderera pakupisa kukuru. Zvisinei, kana graphite ichidziiswa kusvika ku2000c, simba rayo rinopetwa kaviri pane tembiricha yekamuri. Nekudaro, iyo oxidation kuramba yegraphite haina kunaka, uye mwero weoxidation unowedzera zvishoma nezvishoma nekuwedzera kwekushisa.
The thermal conductivity uye conductivity yegraphite yakanyanya kukwirira. Conductivity yaro yakakwira 4 nguva kupfuura yesimbi isina tsvina, 2 nguva yakakwirira kupfuura iyo carbon steel uye 100 nguva yakakwirira kupfuura iyo yakawanda isiri-simbi. Thermal conductivity yaro haingopfuuri chete yezvigadzirwa zvesimbi zvakadai sesimbi, iron uye lead, asi zvakare inoderera nekuwedzera kwekushisa, iyo yakasiyana neyakajairwa simbi zvinhu. Graphite inotoita kunge adiabatic pakupisa kwakanyanya. Naizvozvo, iyo thermal insulation performance yegraphite yakavimbika kwazvo pasi pe-ultra-high tembiricha mamiriro.
Pakupedzisira, tinogona kugumisa kuti kupisa musimboti wegraphite tsvimbondiko: iyo yakakura ikozvino yakawedzerwa kune girafu tsvimbo, iyo yakakwirira yepamusoro yekushisa kweiyo graphite tsvimbo.