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Metalurgické odborné znalosti o titanu:

Slitiny titanu si zachovávají pevnost při vysokých teplotách a vykazují nízkou tepelnou vodivost.

Nerezové oceli mají obsah chromu nejméně 12%. Z chemického hlediska je velmi reaktivní a je náchylný k oxidaci. Oxid generuje jemnou ochrannou vrstvu.

Inconel je superslitina charakterizovaná jedinečnou kombinací vysoko teplotní korozní odolností, oxidační odolností a odolností proti tečení.

Alpha-Beta (α-ß) slitiny

Tyto slitiny mají jak fázi α, tak fázi ß a obsahují jak stabilizátory α, tak ß. Nejjednodušší a nejoblíbenější slitinou v této skupině je Ti6Al4V, který se používá především v leteckém průmyslu. Slitiny v této kategorii jsou snadno tvarovatelné a vykazují vysokou pevnost při pokojové teplotě a střední pevnost při vysoké teplotě. Vlastnosti těchto slitin lze změnit tepelným zpracováním.

Beta (ß) slitiny Beta

Slitiny beta (ß) obsahují přechodné kovy, jako jsou V, Nb, Ta a Mo, které stabilizují fázi ß. Příklady komerčních slitin B zahrnují Ti11.5Mo6Zr4,5Sn, Ti15V3Cr3Al3Sn a Ti5553. Slitiny beta jsou snadno tepelně zpracovatelné, obvykle svařitelné a mají vysokou pevnost. Ve stavu ošetřeného roztoku lze očekávat vynikající tvarovatelnost. Slitiny ß jsou však náchylné k tažnému křehkému přechodu, a proto nejsou vhodné pro kryogenní aplikace. Slitiny beta mají dobrou kombinaci nebo vlastnosti pro plechy, těžké profily, spojovací prvky a pružinové aplikace.

Metalurgické odborné znalosti o hliníku:


Hliníkové slitiny řady 2000

Obsahuje 1,9-6,8% mědi a často obsahuje přísady manganu, hořčíku a zinku. Používají se pro výkovky, výlisky a nádrže na zkapalněný plyn v civilní dopravě a nadzvukových letadlech. Tyto slitiny mají nižší rychlost růstu trhlin a mají tedy lepší únavový výkon než slitiny řady 7000. Používají se proto na spodní křídla a na povrch trupu. Obvykle používané slitiny řady 2000 jsou 2224, 2324, 2524. Tyto slitiny jsou často potaženy 99,34% čistého hliníku pro zvýšenou odolnost proti korozi.


Hliníkové slitiny řady 7000

Systém Al-Zn-Mg nabízí největší potenciál pro vytvrzování precipitací, i když měď se často přidává pro zlepšení odolnosti proti praskání korozním napětím (s nevýhodou snížení svařitelnosti). Odolnost proti praskání korozí klesá se zvyšujícím se poměrem Zn: Mg.


Hliník Lithia

Komerční slitiny hliníku-lithia se vyznačují nízkou hustotou, vysokým měrným modulem, vynikající únavou a kryogenní houževnatostí. 

Spojení Li a Al snižuje hustotu o 3% a zvyšuje modul pružnosti asi o 6%. Na rozdíl od nových materiálových systémů, jako jsou kompozity vyztužené vlákny, hliníkové slitiny s nízkou hustotou nevyžadují velké kapitálové investice výrobce do nových výrobních zařízení.

Metalurgické odborné znalosti o kompozitech:

Kompozitní materiály jsou vyrobeny z polymerové matrice vyztužené vlákny. Polymery vyztužené vlákny se obvykle zaměřují na širokou třídu kompozitů.

Vláknové vyztužení jsou obvykle:

  • uhlíkové vlákno / grafitové vlákno (vysoká pevnost nebo vysoký modul)
  • Skleněná vlákna
  • Keramická vlákna
  • Polymerní vlákna (Kevlar, Polyethylen)
  • Wolframová vlákna

Polymerní matrice jsou obvykle:

  • Epoxidové
  • Fenolické
  • Polyimidní
  • Polyetheretherketone (PEEK)

Trendy v oboru

"Mezi kompozity ,je CFRP kompozitní materiál, který má silný růst. V příštích 15 letech bude nadále růst."

Výzvy

Po celá desetiletí letecký průmysl používal kompozitní materiály v různých aplikacích, včetně letadlových ploch a některých vnitřních částí kabiny. Bohužel tyto materiály jsou jedinečné pro každý design ve svých technikách vrstvení vláken, pryskyřicích a procesech vytvrzování, což vytváří velké výzvy ohledně konzistence při výrobě a montáži.

Kompozitní materiály jsou spojeny dohromady k vytváření složitých konstrukční pod-sestav, které musí být buď sestaveny, nebo připojeny k jiným konstrukčním prvkům vyrobených z hliníku nebo titanu.

To představuje jedinečný soubor výzev, které vyžadují radikálně nové technologie obrábění.

Nástojová řešení

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