Gas boriding of Nimonic 80A alloy

• Autorzy: Makuch N. , Kulka M. , Dziarski P.

Identyfikatory

DOI

10.15199/28.2015.3.6

Warianty tytułu

PL

Borowanie gazowe stopu Nimonic 80A w atmosferze N2–H2–BCl3

• Języki publikacji: EN

Abstrakty

EN

The excellent resistance of Ni-based alloys to corrosion and oxidation has led them being used wherever corrosive media or high temperature are to be expected. However, if Ni-based alloys have to be applied under conditions of appreciable mechanical wear (adhesive or abrasive), these materials require suitable wear protection. Gas boriding in N2–H2–BCl3 atmosphere was proposed to formation of boride layers on Nimonic 80A alloy. This process was carried out at 920°C (1193 K) for 3 hours. The carrier gas consisted of 75 vol. % N2 and 25 vol. % H2. The gases of high purity were used (nitrogen 6.0 and hydrogen 6.0). BCl3 addition was equal to about 1.3 vol. % in relation to the entire atmosphere used (N2–H2–BCl3). The microstructure and some properties of produced layer were studied. Proposed gas boriding accelerated the diffusion of boron into the surface in comparison with other acceptable diffusion methods. The comparable thickness of boride layer was obtained after considerably shorter duration. The significant improvement of hardness was observed as a consequence of gas boriding.

PL

Bardzo dobra odporność stopów niklu na korozję i utlenianie pozwala stosować je tam, gdzie występuje agresywne środowisko lub wysoka temperatura. Jednak stosowanie tych stopów w warunkach znacznego zużycia mechanicznego (adhezyjnego lub ściernego) wymaga odpowiedniego zabezpieczenia. Zaproponowano borowanie gazowe w atmosferze N2–H2–BCl3 do wytworzenia warstwy borków na stopie Nimonic 80A. Proces prowadzono w temperaturze 920°C (1193 K) przez 3 godziny. Gaz nośny zawierał 75% N2 i 25% H2. Stosowano gazy o dużej czystości (azot 6.0 i wodór 6.0). Dodatek BCl3 wynosił około 1,3% w odniesieniu do całej stosowanej atmosfery (N2–H2–BCl3). Podczas pierwszego etapu procesu do atmosfery N2–H2 dodawano BCl3. Badano mikrostrukturę i niektóre właściwości warstwy borowanej. Proponowane borowanie gazowe powodowało przyspieszenie dyfuzji boru do powierzchni w porównaniu z innymi metodami dyfuzyjnymi. Otrzymano porównywalną grubość warstwy borków po znacznie krótszym czasie trwania procesu. Mikroanaliza rentgenowska wykazała zwiększone stężenie boru w warstwie. Zaobserwowano znaczne zwiększenie twardości w wyniku gazowego borowania.

Słowa kluczowe

EN

gas boriding; Nimonic 80A alloy; microstructure; hardness

PL

borowanie gazowe; Nimonic 80A; mikrostruktura; twardość

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2015
• Tom: Vol. 36, nr 3
• Strony: 124--128
• Opis fizyczny: Bibliogr. 43 poz., rys., tab.

Twórcy

autor

Makuch N.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

autor

Kulka M.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

autor

Dziarski P.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

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