The Iron Nitriding in N2 and N2-H2 Afterglows | Chapter 22 | Plasmas Afterglows with N2 for Surface Treatments synthesis 2024

 The iron nitriding which allows a hard coating process has been studied in microwave plasma afterglows in Ar-N2, Ar- N₂-H₂ and Ar-N₂-CH₄ gas mixtures by optical spectroscopy. The thickness of ϵ and γ’ layers have been measured by micrography. It is shown that the introduction of H₂ and CH₄ into N₂ removed the native oxide layers and allowed the growth of ϵ - layers.

To avoid film damage by the plasma high-energy electrons, remote microwave plasmas have given satisfactory results. An iron nitriding with ϵ - layers thickness of 10 μm has been obtained in an industrial scale reactor of 90 liters with Ar-N₂-H₂ gas mixtures heated at 600°C for 2 hours.

 

Author (s) Details

Thierry Czerwiec
Department of Physics and Chemistry of Solids and Surfaces, Institut Jean Lamour, Nancy- Universite, CNRS, Parc de Saurupt, CS 14234, 54042 Nancy Cedex, France.

 

Thierry Belmonte
Department of Physics and Chemistry of Solids and Surfaces, Institut Jean Lamour, Nancy- Universite, CNRS, Parc de Saurupt, CS 14234, 54042 Nancy Cedex, France.

 

André Ricard
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-93-5/CH22

Determination of N-atom Density in High Ar- 𝐍𝟐 Gas Pressure Microwave Afterglow | Chapter 18 | Plasmas Afterglows with N2 for Surface Treatments synthesis 2024

100 to 760 Torr (atmospheric gas pressure). The determination of N -atoms density in high-pressure Ar − N2 microwave afterglow is revisited. First, it is observed that pure pink afterglows are mainly obtained at high pressures up to atmospheric gas pressure, which is an aN+N factor of N + N recombination near 0. Second, there is an uncertainty in the range k = 10⁻¹¹ −10⁻¹² cm³ s⁻¹ on the k-rate coefficient of the reaction 𝑁₂,𝑣 > 13+𝑁₂(𝐴) → 𝑁₂(𝐵,𝑣′)+𝑁₂ which dominates the pink afterglow An enhancement of the 𝑁₂(𝐵,𝑣′ = 8)/𝑁2(𝐵,11) density ratio is observed up to the atmospheric gas pressure. It was interpreted by a reduction of the quenching of the 𝑁₂(𝐵,𝑣′ = 8) by Ar. Values of the 𝑁 +𝑁 recombination rates were determined when 𝑎𝑁+𝑁 > 0.1. It was found a large uncertainty depending on the N₂( B,v′ = 11) quenching rates found in the literature. It is estimated a decrease in the N + N recombination rates by 0.6 in the Ar− 2% N₂ in comparison to pure N2 afterglow. The determination of N-atoms density in high-pressure Ar- xN₂ microwave afterglow is revisited. First, it is confirmed that pure pink afterglows are mainly observed at high

 

Author (s) Details

André Ricard
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.

 

Jayr Amorim
Department Fisica, Inst. Tec. Aeronautica 12228-900, Sao Jose dos Campos, Brazil.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-93-5/CH18