Cathodic cage nitriding of AISI 409 ferritic stainless steel with the addition of CH4

Abstract

AISI 409 ferritic stainless steel samples were nitrided using the cathodic cage plasma nitriding technique (CCPN), with the addition of methane to reduce chromium precipitation, increase hardness and wear resistance and reduce the presence of nitrides when compared to plasma carbonitriding. Microhardness profiles and X-Ray analysis confirm the formation of a very hard layer containing mainly ε-Fe 3 N and expanded ferrite phases.

Análise De Falhas Em Tubulação Do Pré-Aquecedor De Ar Da Caldeira De Uma Usina Sucroalcooleira

“…Esta liga é estabilizada ao titânio, o que oferece uma maior soldabilidade e estabilidade da estrutura ferrítica. As principais aplicações deste aço concentram-se em sistemas de exaustão de gases, motores de explosão e estampagem em geral [7,8].…”

Influence of the plasma nitriding conditions on the chemical and morphological characteristics of TiN coatings deposited on silicon

“…The cathodic cage plasma deposition (CCPD) was developed by Alves et al 1 and has been employed for depositing a variety of coatings on different substrates [1][2][3][4][5][6][7][8][9] . In the CCPD process, the samples are inserted on an alumina insulator disk that is located inside a cage with uniformly distributed round holes of fixed diameter, so that the plasma acts on the cage and not on the sample surface, avoiding possible defects that are commonly formed during conventional plasma deposition [1][2][3][4][5][6][7][8][9] .…”

“…In the CCPD process, the samples are inserted on an alumina insulator disk that is located inside a cage with uniformly distributed round holes of fixed diameter, so that the plasma acts on the cage and not on the sample surface, avoiding possible defects that are commonly formed during conventional plasma deposition [1][2][3][4][5][6][7][8][9] . The CCPD technique has been used for treating not only metallic materials but also electrical insulator materials [1][2][3][4] , and it produces coatings that have high uniformity.…”

Tribo-mechanical features of nitride coatings and diffusion layers produced by cathodic cage technique on martensitic and supermartensitic stainless steels

“…It has been investigated in the last years in different classes of materials such as steels and titanium alloys [3][4][5]. Differently from the conventional plasma nitriding (PN), ionic species do not interact directly with the surface under treatment.…”

“…The thermal energy arriving at the treated surface is provided by irradiation from the sputtered walls [1]. It is important to stress that cage´s composition rules the coating nature, which generally comprises of crystalline phases such as ε-Fe 2-3 N and γ´-Fe 4 N if iron-based materials are used and δ-TiN in the case of titanium-based cathodes [3][4][5].…”