Mawonekedwe a zinthu zotenthetsera zomwe zimagwiritsidwa ntchito m’ng’anjo zamagetsi zotentha kwambiri:

Molybdenum: Nthawi zambiri amagwiritsidwa ntchito mu ng’anjo ya vacuum sintering pa 1600 ° C, kutentha kwake kumathamanga pa 1800 ° C pansi pa vacuum, ndipo kuphulika kumachepa m’mlengalenga woteteza wa hydrogen chifukwa cha kupanikizika, ndipo angagwiritsidwe ntchito mpaka 2000 ° C. ;

Tungsten: Nthawi zambiri amagwiritsidwa ntchito mu ng’anjo ya vacuum sintering pa 2300 ° C, kutentha kwachangu kumathamanga pamene mpweya uli 2400 ° C, kugwedezeka kumachepa m’mlengalenga wotetezera hydrogen chifukwa cha kupanikizika, ndipo angagwiritsidwe ntchito pa 2500 ° C);

Tantalum: Nthawi zambiri amagwiritsidwa ntchito mu ng’anjo ya vacuum sintering pa 2200 ° C. Mosiyana ndi tungsten ndi molybdenum, tantalum singagwire ntchito mumlengalenga wokhala ndi haidrojeni ndi nayitrogeni. Ubwino wake ndikuti ntchito yake yopangira makina ndi kuwotcherera ndi yabwino kuposa ya tungsten ndi molybdenum;

Graphite: Nthawi zambiri ntchito ng’anjo vacuum sintering pa 2200 ° C, ndi volatilization liwiro pa 2300 ° C mu vacuum, ndi volatilization ndi wofooka chifukwa cha kupanikizika mu zoteteza mpweya (inert mpweya), amene angagwiritsidwe ntchito pa 2400 ° C;

1. Tantalum imagwiritsidwa ntchito kwambiri m’ng’anjo za vacuum chifukwa cha makina ake abwino kwambiri komanso kuwotcherera. Komabe, chifukwa cha kutentha kwake kwa kutentha kwa 2200 ° C komanso kulephera kugwiritsa ntchito gasi wotetezera, imalepheretsa kugwiritsidwa ntchito kwake. Zitsulo zosakanizika monga tantalum ndi niobium zimatenga maatomu ambiri a haidrojeni mumlengalenga wa haidrojeni, ndipo zimapangitsa kuti hydrogen iphwanyike ikakhazikika. Zitsulo monga niobium ndi tantalum sachedwa kusungunula m’malo a haidrojeni pamtunda wotentha kwambiri, kotero sangathe kutetezedwa ndi haidrojeni.

Ndi chitetezo chamtundu wanji chomwe tantalum angagwiritse ntchito kuti achepetse kugwedezeka? Kuphatikiza pa kugwiritsa ntchito chitetezo cha argon ndi chitetezo cha argon-hydrogen chosakanikirana cha gasi, bola ngati mpweya womwe suchita ndi tantalum panthawi ya kutentha kwanthawi zonse, ungagwiritsidwe ntchito ngati chitetezo chamlengalenga. Kukhazikika kwa argon ndikwabwino kuposa nayitrogeni. Komabe, inertness wa nayitrogeni ndi wachibale, ndiko kuti, si koyenera zochita zina. Magnesium imatha kuyaka mu nayitrogeni. Choncho, mwina zomwe zimachitika sizingagwiritse ntchito nayitrogeni ngati mpweya wotetezera, koma zimatha kusankha argon. Momwe mungapangire chipika cha tungsten chokutidwa ndi zinthu za tantalum: Itha kutheka popopera mankhwala a plasma pamwamba pa zinthu za tungsten motetezedwa ndi argon atmosphere.

2. Tungsten Chifukwa chakuti tungsten imakhala ndi ntchito yabwino yotentha kwambiri, ndikuwongolera ndi kukonza luso la mapangidwe ndi kupanga, tungsten imagwiritsidwa ntchito kwambiri mu ng’anjo zovumbulutsira zotentha kwambiri. Palibe vuto ndi kugwiritsa ntchito tungsten mu ng’anjo pansi pa 2300 ℃. Pa 2300 ℃, kutenthetsa kudzakhala kofulumira, zomwe zidzakhudza moyo wautumiki wa kutentha kwa thupi. Choncho, nthawi zambiri tikulimbikitsidwa kugwiritsa ntchito mpweya woteteza haidrojeni pa 2200 ~ 2500 ℃;

3. Graphite Kutentha kwa chinthu kumagwiritsidwa ntchito potenthetsa graphite mu ng’anjo yovumbulutsidwa. Ndizoyera kwambiri, zamphamvu kwambiri, isotropic yopangidwa ndi isotropic itatu-high graphite, mwinamwake yodalirika yogwira ntchito yotentha kwambiri, ntchito yamagetsi ndi moyo wautumiki sizidzapezeka.

4. M’ng’anjo yapakati ndi yotsika kutentha kwa vacuum, chifukwa cha kutentha kochepa, tungsten nthawi zambiri sagwiritsidwa ntchito, nthawi zambiri amagwiritsidwa ntchito graphite, tantalum, ndi molybdenum; Kwa ng’anjo zosachepera 1000 ℃, zida za nickel-cadmium ndi chitsulo-chromium-aluminium zida zimagwiritsidwanso ntchito. Dikirani.