{"id":4929,"date":"2024-07-19T02:04:14","date_gmt":"2024-07-19T02:04:14","guid":{"rendered":"https:\/\/3dpmetal.com\/?p=4929"},"modified":"2024-07-19T02:04:18","modified_gmt":"2024-07-19T02:04:18","slug":"refractory-metal-powders-202407191","status":"publish","type":"post","link":"https:\/\/3dpmetal.com\/cs\/refractory-metal-powders-202407191\/","title":{"rendered":"\u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky"},"content":{"rendered":"

P\u0159ehled \u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky<\/a><\/strong><\/h2>\n\n\n\n

\u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky jsou fascinuj\u00edc\u00ed a z\u00e1sadn\u00ed sou\u010d\u00e1st\u00ed sv\u011bta v\u011bdy o materi\u00e1lech. Tyto pr\u00e1\u0161ky, zn\u00e1m\u00e9 pro svou neuv\u011b\u0159itelnou odolnost v\u016f\u010di teplu a opot\u0159eben\u00ed, se pou\u017e\u00edvaj\u00ed v r\u016fzn\u00fdch aplikac\u00edch p\u0159i vysok\u00fdch teplot\u00e1ch a vysok\u00e9m nam\u00e1h\u00e1n\u00ed. Co p\u0159esn\u011b ale \u017e\u00e1ruvzdorn\u00e9 kovy jsou a pro\u010d jsou tak d\u016fle\u017eit\u00e9?<\/p>\n\n\n\n

Mezi \u017e\u00e1ruvzdorn\u00e9 kovy pat\u0159\u00ed wolfram, molybden, niob, tantal a rhenium. Tyto kovy maj\u00ed jedny z nejvy\u0161\u0161\u00edch teplot t\u00e1n\u00ed ze v\u0161ech prvk\u016f, tak\u017ee jsou ide\u00e1ln\u00ed pro pou\u017eit\u00ed v extr\u00e9mn\u00edch prost\u0159ed\u00edch. Od leteck\u00e9 techniky a\u017e po elektroniku jsou tyto pr\u00e1\u0161ky neop\u011bvovan\u00fdmi hrdiny, kte\u0159\u00ed zaji\u0161\u0165uj\u00ed spolehlivost a v\u00fdkon tam, kde je to nejd\u016fle\u017eit\u011bj\u0161\u00ed.<\/p>\n\n\n\n

Slo\u017een\u00ed \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f<\/strong><\/h2>\n\n\n\n

Abychom skute\u010dn\u011b ocenili jedine\u010dn\u00e9 vlastnosti \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f, prozkoumejme jejich slo\u017een\u00ed. Zde je tabulka shrnuj\u00edc\u00ed hlavn\u00ed \u017e\u00e1ruvzdorn\u00e9 kovy a jejich typick\u00e9 slo\u017een\u00ed.<\/p>\n\n\n\n

Kov<\/strong><\/th>Atomov\u00e9 \u010d\u00edslo<\/strong><\/th>Bod t\u00e1n\u00ed (\u00b0C)<\/strong><\/th>Hustota (g\/cm\u00b3)<\/strong><\/th>Hlavn\u00ed slitiny\/slou\u010deniny<\/strong><\/th><\/tr><\/thead>
Wolfram (W)<\/td>74<\/td>3422<\/td>19.25<\/td>WC (karbid wolframu), W-Ni<\/td><\/tr>
Molybden (Mo)<\/td>42<\/td>2623<\/td>10.28<\/td>MoSi2, Mo-Ti<\/td><\/tr>
Niob (Nb)<\/td>41<\/td>2477<\/td>8.57<\/td>NbC, Nb-Ti<\/td><\/tr>
Tantal (Ta)<\/td>73<\/td>3017<\/td>16.69<\/td>TaC, Ta-W<\/td><\/tr>
Rhenium (Re)<\/td>75<\/td>3186<\/td>21.02<\/td>Re-W, Re-Mo<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
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\"\u017e\u00e1ruvzdorn\u00e9<\/figure>\n<\/div>\n\n\n

Charakteristika \u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky<\/a><\/strong><\/h2>\n\n\n\n

\u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky vykazuj\u00ed \u0159adu pozoruhodn\u00fdch vlastnost\u00ed, kter\u00e9 je \u010din\u00ed vhodn\u00fdmi pro specializovan\u00e9 aplikace. Zde jsou n\u011bkter\u00e9 kl\u00ed\u010dov\u00e9 vlastnosti:<\/p>\n\n\n\n

    \n
  1. Vysok\u00e9 body t\u00e1n\u00ed:<\/strong> Tyto kovy odol\u00e1vaj\u00ed extr\u00e9mn\u00edm teplot\u00e1m, ani\u017e by se roztavily, a zachov\u00e1vaj\u00ed tak integritu konstrukce.<\/li>\n\n\n\n
  2. V\u00fdjime\u010dn\u00e1 tvrdost:<\/strong> Jsou neuv\u011b\u0159iteln\u011b tvrd\u00e9 a odoln\u00e9 proti ot\u011bru, tak\u017ee jsou ide\u00e1ln\u00ed pro \u0159ezn\u00e9 n\u00e1stroje a ot\u011bruvzdorn\u00e9 povlaky.<\/li>\n\n\n\n
  3. Chemick\u00e1 stabilita:<\/strong> \u017d\u00e1ruvzdorn\u00e9 kovy jsou odoln\u00e9 v\u016f\u010di oxidaci a korozi, a to i p\u0159i vysok\u00fdch teplot\u00e1ch.<\/li>\n\n\n\n
  4. Vysok\u00e1 hustota:<\/strong> Tyto kovy jsou hutn\u00e9 a poskytuj\u00ed zna\u010dnou hmotnost a stabilitu v r\u016fzn\u00fdch aplikac\u00edch.<\/li>\n<\/ol>\n\n\n\n

    Pou\u017eit\u00ed \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f<\/strong><\/h2>\n\n\n\n

    Jedine\u010dn\u00e9 vlastnosti \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f otev\u00edraj\u00ed dve\u0159e \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed. Zde je tabulka shrnuj\u00edc\u00ed jejich hlavn\u00ed pou\u017eit\u00ed:<\/p>\n\n\n\n

    Aplikace<\/strong><\/th>Pou\u017eit\u00fd \u017e\u00e1ruvzdorn\u00fd kov<\/strong><\/th>Popis<\/strong><\/th><\/tr><\/thead>
    Aerospace komponenty<\/td>Wolfram, rhenium<\/td>Pou\u017e\u00edv\u00e1 se ve vysokoteplotn\u00edch \u010d\u00e1stech motor\u016f, trysk\u00e1ch a turb\u00edn\u00e1ch.<\/td><\/tr>
    Elektronika<\/td>Tantal, niob<\/td>Nezbytn\u00e9 pro kondenz\u00e1tory, rezistory a v\u00fdkonnou elektroniku.<\/td><\/tr>
    Zdravotnick\u00e9 vybaven\u00ed<\/td>Tantal, molybden<\/td>Pou\u017e\u00edv\u00e1 se v chirurgick\u00fdch n\u00e1stroj\u00edch, implant\u00e1tech a zobrazovac\u00edch za\u0159\u00edzen\u00edch.<\/td><\/tr>
    Pr\u016fmyslov\u00e9 \u0159ezn\u00e9 n\u00e1stroje<\/td>Wolfram, molybden<\/td>Pou\u017e\u00edv\u00e1 se p\u0159i v\u00fdrob\u011b \u0159ezn\u00fdch a vrtac\u00edch n\u00e1stroj\u016f.<\/td><\/tr>
    Obrana a vojenstv\u00ed<\/td>Wolfram, rhenium<\/td>Kritick\u00e9 pro panc\u00e9\u0159ov\u00e9 st\u0159ely a sou\u010d\u00e1sti st\u0159el.<\/td><\/tr>
    Chemick\u00e9 zpracov\u00e1n\u00ed<\/td>Molybden, tantal<\/td>Pou\u017e\u00edv\u00e1 se v reaktorech, v\u00fdm\u011bn\u00edc\u00edch tepla a potrubn\u00edch syst\u00e9mech.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Specifikace, velikosti, t\u0159\u00eddy a normy \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f<\/strong><\/h2>\n\n\n\n

    Co se t\u00fd\u010de specifikac\u00ed, velikost\u00ed, t\u0159\u00edd a norem, \u017e\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky jsou pe\u010dliv\u011b klasifikov\u00e1ny tak, aby vyhovovaly pot\u0159eb\u00e1m pr\u016fmyslu. N\u00ed\u017ee je uvedena tabulka s b\u011b\u017en\u00fdmi specifikacemi t\u011bchto pr\u00e1\u0161k\u016f:<\/p>\n\n\n\n

    Kov<\/strong><\/th>Hodnost<\/strong><\/th>Velikost \u010d\u00e1stic (\u00b5m)<\/strong><\/th>\u010cistota (%)<\/strong><\/th>Standard<\/strong><\/th><\/tr><\/thead>
    Wolfram (W)<\/td>W-1, W-2<\/td>< 1 a\u017e 50<\/td>> 99.95<\/td>ASTM B777, AMS 7725<\/td><\/tr>
    Molybden (Mo)<\/td>Mo-1, Mo-2<\/td>< 1 a\u017e 40<\/td>> 99.9<\/td>ASTM B386, AMS 7830<\/td><\/tr>
    Niob (Nb)<\/td>Nb-1, Nb-2<\/td>< 1 a\u017e 45<\/td>> 99.9<\/td>ASTM B392, AMS 7850<\/td><\/tr>
    Tantal (Ta)<\/td>Ta-1, Ta-2<\/td>< 1 a\u017e 35<\/td>> 99.9<\/td>ASTM B708, AMS 7847<\/td><\/tr>
    Rhenium (Re)<\/td>Re-1, Re-2<\/td>< 1 a\u017e 30<\/td>> 99.9<\/td>ASTM B826, AMS 7864<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Dodavatel\u00e9 a podrobnosti o cen\u00e1ch \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f<\/strong><\/h2>\n\n\n\n

    Nalezen\u00ed spolehliv\u00fdch dodavatel\u016f \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f m\u00e1 z\u00e1sadn\u00ed v\u00fdznam pro zachov\u00e1n\u00ed kvality a konzistence. Zde je tabulka s n\u011bkter\u00fdmi v\u00fdznamn\u00fdmi dodavateli a orienta\u010dn\u00edmi cenami:<\/p>\n\n\n\n

    Dodavatel<\/strong><\/th>Nab\u00edzen\u00fd kov<\/strong><\/th>Cena (USD\/kg)<\/strong><\/th>Um\u00edst\u011bn\u00ed<\/strong><\/th>Webov\u00e9 str\u00e1nky<\/strong><\/th><\/tr><\/thead>
    H.C. Starck<\/td>Wolfram, tantal<\/td>$500 – $800<\/td>N\u011bmecko<\/td>www.hcstarck.com<\/td><\/tr>
    Plansee<\/td>Molybden, niob<\/td>$300 – $600<\/td>Rakousko<\/td>www.plansee.com<\/td><\/tr>
    Rhenium Alloys, Inc.<\/td>Rhenium<\/td>$4000 – $6000<\/td>USA<\/td>www.rhenium.com<\/td><\/tr>
    Global Tungsten & Powders Corp.<\/td>Wolfram, molybden<\/td>$450 – $750<\/td>USA<\/td>www.globaltungsten.com<\/td><\/tr>
    Pokro\u010dil\u00e9 \u017e\u00e1ruvzdorn\u00e9 kovy<\/td>V\u0161echny \u017e\u00e1ruvzdorn\u00e9 kovy<\/td>R\u016fzn\u00e9<\/td>\u010c\u00edna<\/td>www.refractorymetal.org<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n
    \"kvalitn\u00ed<\/figure>\n\n\n\n
    \"\u017e\u00e1ruvzdorn\u00e9<\/figure>\n\n\n\n
    \"pr\u00e1\u0161kov\u00e1<\/figure>\n\n\n\n
    \"Aditivn\u00ed<\/figure>\n\n\n\n
    \"Pr\u00e1\u0161ek<\/figure>\n\n\n\n
    \"rozpra\u0161ov\u00e1n\u00ed<\/figure>\n<\/figure>\n\n\n\n

    Srovn\u00e1n\u00ed v\u00fdhod a nev\u00fdhod \u017d\u00e1ruvzdorn\u00e9 kovov\u00e9 pr\u00e1\u0161ky<\/a><\/strong><\/h2>\n\n\n\n

    Pochopen\u00ed v\u00fdhod a nev\u00fdhod \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f m\u016f\u017ee pomoci p\u0159i rozhodov\u00e1n\u00ed o konkr\u00e9tn\u00edch aplikac\u00edch. Zde je podrobn\u00e9 srovn\u00e1n\u00ed:<\/p>\n\n\n\n

    Kov<\/strong><\/th>V\u00fdhody<\/strong><\/th>Nev\u00fdhody<\/strong><\/th><\/tr><\/thead>
    Wolfram (W)<\/td>Extr\u00e9mn\u011b vysok\u00fd bod t\u00e1n\u00ed, vynikaj\u00edc\u00ed tvrdost<\/td>Vysok\u00e1 hustota, obt\u00ed\u017en\u011b obrobiteln\u00e1<\/td><\/tr>
    Molybden (Mo)<\/td>Dobr\u00e1 pevnost p\u0159i vysok\u00fdch teplot\u00e1ch, ni\u017e\u0161\u00ed cena<\/td>Oxiduje p\u0159i vysok\u00fdch teplot\u00e1ch bez ochrann\u00e9ho povlaku<\/td><\/tr>
    Niob (Nb)<\/td>Dobr\u00e1 ta\u017enost, supravodiv\u00e9 vlastnosti<\/td>N\u00e1chyln\u00fd k oxidaci, relativn\u011b n\u00edzk\u00fd bod t\u00e1n\u00ed<\/td><\/tr>
    Tantal (Ta)<\/td>Vynikaj\u00edc\u00ed odolnost proti korozi, biokompatibilita<\/td>Drah\u00e9, omezen\u00e1 dostupnost<\/td><\/tr>
    Rhenium (Re)<\/td>Velmi vysok\u00fd bod t\u00e1n\u00ed, vynikaj\u00edc\u00ed odolnost proti te\u010den\u00ed<\/td>Extr\u00e9mn\u011b drah\u00e9, vz\u00e1cn\u00e9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Specifick\u00e9 modely kovov\u00fdch pr\u00e1\u0161k\u016f a jejich popisy<\/strong><\/h2>\n\n\n\n

    Abychom v\u00e1m poskytli jasn\u011bj\u0161\u00ed p\u0159edstavu o rozmanitosti \u017e\u00e1ruvzdorn\u00fdch kovov\u00fdch pr\u00e1\u0161k\u016f, prozkoumejme konkr\u00e9tn\u00ed modely:<\/p>\n\n\n\n

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    1. Wolframov\u00fd pr\u00e1\u0161ek W-1<\/strong><\/li>\n<\/ol>\n\n\n\n