Influence of Plasma Power and Oxygen-Containing Process Gases in Active Screen Plasma Nitrocarburizing with Carbon Solid Source*

IF 0.3 Q4 THERMODYNAMICS HTM-Journal of Heat Treatment and Materials Pub Date : 2022-10-01 DOI:10.1515/htm-2022-1026
J. Böcker, A. Puth, A. Pipa, J. H. Helden, J. Röpcke, H. Biermann, A. Dalke
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Abstract

Abstract Plasma nitrocarburizing by means of active screen technology using an active screen made of carbon fiber-reinforced carbon was carried out by varying the power at the active screen and using oxygen-containing fresh gas components (O2, CO2) in the N2:H2 plasma using the example of the quenched and tempered steel AISI 4140 (42CrMo4). The investigations focused on the analysis of the process gas by means of laser absorption spectroscopy, the evaluation of the produced compound layers with regard to structure and phase composition, as well as the resulting properties. It was shown that by varying the process gas atmosphere, the structural composition of the compound layer and the concentration profiles of nitrogen and carbon can be specifically influenced. The high concentrations of carbon-containing compounds in the process gas resulted in complete suppression of γ’-Fe4N formation, but cementite was detected in the lower part of the compound layer. The addition of oxygen-containing fresh gases and the resulting change in process gas composition suppressed cementite formation. The results suggest that, in particular, high powers at the carbon active screen and the simultaneous addition of oxygen-containing gases results in the generation of nitrogen-rich, single-phase ε-compound layers.
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等离子体功率和含氧工艺气体对碳固体源主动筛等离子体氮碳共渗的影响*
摘要:以调质钢AISI 4140 (42CrMo4)为例,通过改变活性筛的功率,利用N2:H2等离子体中含氧新鲜气体组分(O2、CO2),利用碳纤维增强碳的活性筛进行了活性筛等离子体氮碳共渗。研究的重点是用激光吸收光谱分析工艺气体,评价所生产的化合物层的结构和相组成,以及所得的性能。结果表明,不同的工艺气氛对复合层的结构组成和氮、碳的浓度分布有明显的影响。工艺气体中高浓度的含碳化合物完全抑制了γ′-Fe4N的形成,但在化合物层的下部检测到渗碳体。含氧新鲜气体的加入和由此引起的工艺气体成分的变化抑制了渗碳体的形成。结果表明,特别是在活性炭活性屏处的高功率和同时加入含氧气体会产生富氮的单相ε-化合物层。
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CiteScore
1.50
自引率
33.30%
发文量
43
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