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Quality-cost analysis of modern carburising technology implementation in the production cycle of cog elements for the aviation industry

Pawęta S., Pietrasik R.

Archives of Materials Science and Engineering

2017

Vol. 87, nr 2

75--84

Purpose: The aim of the study was to analyse the possibility of introducing vacuum carburising technology with pre-nitriding in the aviation industry. Design/methodology/approach: The samples have been tested with new technology and the planet gear requirements for aviation applications were determined. The effect of pre-nitriding technology used before vacuum carburising was also investigated for antidiffusional surface protection. A cost analysis of replacing the conventional technology with a new low-pressure carburising technology has also been introduced. Findings: Structural characteristics of the obtained layers were determined in terms of carbon concentration distribution, effective and total thicknesses, hardness of the surface and core, structure, grain size, residual austenite content and lack of decarburization and internal oxidation. The degree of degradation of various forms of anti-diffusion protections in the form of pastes and coppering and their effect on the surface layer have also been investigated. The comparative economic analysis of the use of conventional and vacuum technologies, namely the carburization in a function of the required thickness of the hardened layer and temperatures of processes, has also been made. Research limitations/implications: Basing on the studies and analyses carried out in this work, it can be concluded that the introduction of pre-nitriding carburising technology instead of conventional carburising technology in endothermic atmosphere is justified qualitatively and economically alike. Practical implications: The analysis of the test results confirms that it is possible to meet the requirements of the aviation industry through high temperature pre-nitriding vacuum carburising. The results of anti-diffusion protection tests confirm that it is possible to use anti-fouling pastes instead of electrolytic copper. Cost analysis confirms the economic benefits of implementing a new technology. The implication of the above is the willingness of the proposed technology to allow testing in the aviation industry. Originality/value: The research confirming the fulfilment of quality requirements set for hardened layers in aviation applications which also have an economic advantage.