Nitriding Effect on HVAF FeMnCrSi Coating

Oliveira, Willian Rafael de; Mayer, Andre Renan; Souza, Gelson Biscaia de; Fals, Hipólito Carvajal; Pukasiewicz, Anderson Geraldo Marenda

doi:10.1007/s11666-023-01557-7

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…Рассмотрению воздействия тлеющего и СВЧ газовых разрядов на поверхность изделий посвящено большое количество экспериментальных и теоретических работ [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Так, в работах [30,31] обсуждается обработка изделий, размещенных вблизи антенны -катода внутри резонаторной камеры, заполненной аргоном при давлении P = 40−130 Pa, в облаке сверхплотной плазмы ω P = n e e 2 /ε 0 m e > ω, где e -элементарный электрический заряд, m e -масса электрона, ω = 1.54 • 10 10 s −1 -частота колебаний СВЧ поля, создаваемого магнетроном.…”

Section: Introductionunclassified

Изучение Диодных Свойств Двойного Слоя Комбинированного Газового Разряда

Бржозовский¹,

Бровкова²,

Гестрин³

et al. 2023

Журнал Технической Физики

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The paper shows that upon ignition of the combined gas discharge in the resonator chamber, there appears a double layer with diode properties that consists of layers of positive and negative charges surrounding the workpiece. An increase in the level of microwave power supplied to the chamber leads to a decrease in the equivalent diode resistance in open and closed modes and an increase in the current flowing through the unit. The ions of the process gas (nitrogen or argon) ionized by the microwave field fall on the product surface and diffuse into it as a result of the thermal diffusion process, which hardens the surface layer. The product is heated when a positive bias potential is applied to it by a stream of high-energy electrons arriving at the surface and accelerated to energies of tens and hundreds eV in the discharge acceleration zone. Ion-plasma implantation leads to a significant increase in the strength, wear resistance and corrosion resistance of the surface of the processed product.

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Section: Introductionunclassified

Изучение Диодных Свойств Двойного Слоя Комбинированного Газового Разряда

Бржозовский¹,

Бровкова²,

Гестрин³

et al. 2023

Журнал Технической Физики

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Enhanced Wear Resistance of Gas Nitrided AISI 431 HVOF Coatings at Elevated Temperatures

Hanisch,

Saborowski,

Lindner

et al. 2024

J. of Materi Eng and Perform

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Stainless-steel feedstocks achieve increasing importance as sustainable and cost-efficient alternative regarding thermal spraying. However, the wear resistance is often insufficient for demanding applications. Therefore, an additional surface hardening step by thermochemical processes, in particular by gas nitriding, is promising for enhancing surface functionality. The characteristic porosity of thermally sprayed coatings facilitates deep nitrogen diffusion increasing hardness and wear resistance, due to the formation of precipitates. Because nitrides are thermally stable, applications at elevated temperatures are enabled. The process combination was examined for the ferritic stainless-steel AISI 431 applied on mild steel by high-velocity oxygen fuel spraying (HVOF), followed by subsequent gas nitriding. The influence of the thermochemical treatment with respect to a variation in the nitriding potential has been determined in terms of microstructure, phase formation, hardness distribution as well as reciprocating wear resistance at room and elevated temperature. The increase in hardness over 900 HV0.01 and wear resistance with wear rates consistently lower than 1.3 × 10-4 mm3 Nm−1 can be attributed to the successful enrichment of nitrogen and the formation of mainly Fe4N precipitates at the coating’s surface. Even at 350 °C, the nitride surface layer provides better wear protection compared to the as-sprayed condition. Graphical Abstract

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