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Nueva tecnología de revestimiento nanométrico multifuncional con hidrocarburo en mezclas de polvos ferrosos para producir componentes de acero pulvimetalúrgico reciclables, de alta densidad y alto rendimiento


Oferta Tecnológica
Un equipo formado por integrantes de dos institutos de investigación búlgaros, con más de 40 años de experiencia en pulvimetalurgia y tecnologías y productos de revestimiento, ha desarrollado un nuevo revestimiento que garantiza altas propiedades mecánicas y dinámicas. El equipo busca institutos de investigación (pruebas y modelado) con el fin de establecer acuerdos de cooperación en materia de investigación y socios industriales para establecer acuerdos de cooperación técnica y llevar a cabo la verificación en condiciones industriales.


Innovative technology for multifunctional nanometric coating with hydrocarbon on ferrous powder mixes to produce recyclable, high-density, high performance powder metallurgy steel components
A joint team from two research institutes from Bulgaria with more than 40 years of experience in powder metallurgy and coating technologies and products has developed a novel coating technology ensuring high mechanical properties and dynamic properties. Research cooperation agreements are sought for joint project development with research institutes (testing and modelling) and industrial partners for verification in industrial conditions and technical cooperation agreements with industry.
The Bulgarian research institutes have long-term experience in R-Y-D of coating technologies, novel nano- and specialised materials, composites, and technologies for their production in the field of metal science, machinery, shipping and defense industry.
Carbon plays a fundamental role in iron powder metallurgy. As an alloying element carbon strongly determines the principal properties of sintered iron base materials, i.e. their dimensional changes, tensile strength, elongation and hardenability. Particularly, the latter property is very sensitive to carbon content. For this reason, especially hardenable sintered steels require very careful control of carbon content during the whole production process, i.e. starting from powder mixture (or alloyed powder) till the sintered compact. While the initial carbon content in the green compact can be precisely defined, its final concentration, depending on several materials and processing parameters is not easy to predict. Generally, with regard to carbon control, steels should be sintered in atmospheres with low CO2 content, low dew point and with properly chosen carbon potential. Oxygen concentration in the base powder has a main effect on the carbon loss during sintering when carbon is used for oxide reduction. Therefore, special attention must be paid to the powders used from the viewpoint of their chemical purity.
Carbon concentration influences strongly the chemical reactions taking place during the sintering cycle, which in turn affect the properties of the sintered material. Thus, to avoid both decarburizing and carburizing and to achieve a proper carbon level in a sintered product, its starting concentration in a green compact must be chosen by taking into account all reactions occurring within a compact and between it and the sintering atmosphere. Practically, it is best to establish experimentally the relationship of starting vs. final carbon content. In industrial practice the desired concentration of carbon in a green compact may be achieved by using either alloyed or pre-alloyed powder or a powder mixture containing graphite. The latter option is mostly used because of its versatility in respect of composition and better compactibility. However, there are at least two important disadvantages of graphite containing powder mixtures, i.e. the tendency to segregation during handling and often insufficient homogenisation during sintering.
The novel technology developed involves coating the ferrous powder with a hydrocarbon donor. As the hydrocarbon dissociates nascent carbon is deposited on all powder particles and is then available for alloying. Also hydrogen is released which can assist in ensuring reducing conditions in an otherwise dry, but neutral, atmosphere. Dry technical nitrogen is used to process manganese / chromiun steels in semi-closed containers with manganese and carbon donors; this communication explores the hydrocarbon donor technique for nitrogen sintering of steels also containing the easily oxidisable chromium and manganese.
To improve dimensional stability by avoiding segregation of graphite in a powder mixture, some organic substances have been introduced recently to iron powder metallurgy. Their function is to produce bonded mixtures in which small and light graphite particles are homogenously distributed and do not tend to segregate. The substitute may be completely graphite powder with carbon added in a bound form as a hydrocarbon compound. Almost in every case clean carbon is produced as a valuable by-product of the process. The idea in to use that carbon to produce sintered steels. Additionally, organic compounds can also act as lubricants and binders.
The joint research team seeks research cooperation agreements for joint project development with other research institutes (to test and model the technology further) and industrial partners; technical cooperation agreements - verification in industrial conditions.
Advantages and Innovations:
- entirely novel design in comparison with existing technologies
- no hydrogen use in the furnace atmosphere during sintering: ensuring higher safety conditions
- use of hydrocarbon substitute instead of conventional graphite addition technique in the powder mixtures, ensuring a very high grade homogeneous substance: leading to high mechanical and dynamic properties of the treated components
- the coating features a very solid adhesive bond with the substrate
- high precision of the process and lower dew point in comparison to existing technologies
- from 5 to 10 % lower internal micro tension of the treated material achieved
Stage of Development:
Under development/lab tested
Patents granted
CommeR Statunts Regarding IPR Status:
The patent applies for the territory of Bulgaria.

Partner sought

Type and Role of Partner Sought:
- Type of partner sought: partners from the research sector and industrial partners;
- Specific area of activity of the partner: research and industrial partners working in the field of: coatings and nano-materials, specialised materials, metals and allows;
- Task to be performed: research cooperation agreements joint project development with research institutes for testing and modelling of the technology and industrial partners for verification in industrial conditions; technical cooperation agreements with industrial partners for adaptation in industrial conditions as the Bulgarian research team will provide expertise and know-how in order to meet the new market needs.


Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
Languages Spoken:


Technology Keywords:
02002005 Forming (rolling, forging, pressing, drawing)
02007008 Hierro y acero, estructuras metálicas
02007010 Metals and Alloys
02002012 Mezclado (polvo, etc), separación (clasificación, filtrado)
02002015 Surface treatment (painting, galvano, polishing, CVD, ..)