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K. Żaba, S. Puchlerska, M. Kwiatkowski, M. Nowosielski, M. Głodzik, T. Tokarski and P. Seibt

Nickel superalloys as Inconel® are materials widely used in the aerospace industry among others for diffusers, combustion chamber, shells of gas generators and other. In most cases, manufacturing process of those parts are used metal strips, produced by conventional plastic processing techniques, and thus by hot or cold rolling. An alternative technology allowing for manufacturing components for jet engines is the technique of 3D printing (additive manufacturing), and most of all Direct Metal Laser Sintering, which is one of the latest achievement in field of additive technologies.

The paper presents a comparative analysis of the microstructure and mechanical properties of the alloy Inconel®718 manufactured by plastic working and Direct Metal Laser Sintering technology, in the initial state, after deformation and after heat treatment.

Open access

V. V. Silvestrov, S. A. Bordzilovskii, S. M. Karakhanov and A. V. Plastinin

References [1] V.V. Sil’vestrov, A.V. Plastinin, The study of low-velocity emulsion explosives, Combustion, Explosion, and Shock Waves 45 , 5, 618 (2009). [2] V.V. Sil’v es trov, Investigation of emulsion explosives and their applications at the Lavrentyev Institute of Hydrodynamics, Proc. Int. Conf. XV Khariton Thematic Scienti?c Readings, 135-139, VNIIEF, Sarov (2013), [in Russian]. [3] B.S. Zlobin, V.V. Sil’ve strov, A.A. Shtertser, A.V. Plastinin, New explosive welding technique for production of bimetal plane bearings, in A.A. Deribas, Yu

Open access

H.S. Yang, D.H. Jang and K.J. Lee

REFERENCES [1] K. Reszka, J. Rakoczy, J. Morgiel, Journal of KONES, internal combustion engines, (Warsaw, Poland, 2005), 211-218. [2] S. Zhao, J. Zhang, D. Weng, X. Wu, Surf Coat Technol. 167 , 1 (2003). [3] L. Jia, M. Shen, J. Wang, Surf Coat Technol. 201 , 16-17 (2007). [4] D. Sebayang, Y. Putrasari, S. Hasan, M. Othman, P. Untoro, ed. By Prof. D. Sebayang (Electroplating, InTech, 2012), 1-28. [5] Q. Li, J. Liang, Q. Wang, Plasma Electrolytic Oxidation Coating on Lightweight Metals, Modern Surface Engineering Treatments, ed. By M

Open access

W. Longa

Joint Theory of Thermal Work for Heating Zone of Coke, Coke-Gas and Gas-Fired Cupolas (based on theory of heat exchangers of H. Le Chatelier)

The analytical theory of thermal work in the heating zone of coke, coke-gas and gas-fired cupolas has been presented in the work. The conception of elaboration of joint (one) thermal theory for the mentioned groups of cupolas has not been considered in the literature so far due to the following reasons:

- lack of consistent theory for coke cupolas,

- total lack of theoretical basis for thermal work of gas-fired and coke-gas-fired cupolas.

The presented paper contains a set of equations for the calculation of characteristic parameters of the heating zone in the coke-, coke-gas- and gas-fired cupolas such as: efficiency, zone heights, temperatures of combustion gas at zone inlets and outlets as well as at height of zones, heating time of metal pieces up to the melting temperature, rate of movement of charge materials down the furnace shaft, losses of physical heat transferred in combustion gases to the ambience. The contribution has derived a basis for the energy analysis of thermal work of the cupolas as well as examples of calculations of characteristic parameters connected with their thermal process.

A new approach to selected controversial aspects of the theory of coke cupola performance has been formulated.

Open access

M. Fröhlichová, J. Legemza, R. Findorák and A. Mašlejová

357-364 (2012). [10] W. Yang, S. Choi, E.S. Choi, D.W. Ri, S. Kim, Combustion Characteristics ina Iron Ore Sintering Bed- Evaluation of Fuel Substitution, Combustion and Flame 145, 447-463 (2006). [11] W. Yang, Modelling of Combustion and Heat Transfer in an Iron Ore Sintering Bed with Considerations Of Multiple Solid Phases, ISIJ International 44 (3), 492-499 (2004). [12] P.R. Dawson, Recent developments in iron ore sintering, part 1-4, Ironmaking and Steelmaking 20 (1), 135-151 (1993). [13] T. Norgat

Open access

A. Hołda and Z. Kolenda

Abstract

A new method of falsification of the mathematical model of the processes taking place inside the aluminium electrolysis cell has been proposed. The method is based on the comparison of the calculation results of the entropy generation rates obtained in theoretical way with the exergy losses estimated from global exergy balance equation. Following irreversible processes have been analyzed - electric current flow, diffusion at the cathode, heat and electric current flow through the anode and cathode, irreversible carbon combustion, heat transfer from electrolyser to the surroundings and convection inside the electrolyte. Exergy balance calculations have been based on the experimental results from industry. The proposed procedure shows good accuracy between mathematical model and experimental data.

Open access

J. Sokołowski and P. Urbańska

Abstract

The compositions of phosphogypsum and power plant ash as waste created in the production of an orthophosphoric acid and the coal combustion with the addition of fine coal were prepared. The compositions were then granulated and sintered in a muffle furnace in the atmosphere of air under the conditions previously determined. The compressive strength, open porosity and water absorption were also determined and compared with the results obtained for the commercial aggregate. Chemical and phase compositions of the aggregate were also studied. The results of the research indicate that proposed method of the high temperature utilization of phosphogypsum and power plant ash has a great potential for application and it is worth of further research.

Open access

A. Shtertser, O. Stoyanovskii, B. Zlobin, Y. Meshcheryakov and Y. Skornyakov

References [1] A.F. Demchuk, Method for designing explosion chambers, Journal of Applied Mechanics and Technical Physics 9, 5,558-559 (1968). [2] V.V. Adishchev, V.M. Kornev, Calculations of the shells of explosion chambers, Combustion, Explosions, and Shock Waves 15, 6, 780-784 (1979). [3] A.A. Buzukov, Forces produced by an explosion in an air-filled explosion chamber, Combustion, Explosion, and Shock Waves 16, 5, 555-559 (1980). [4] S.A. Zhdan, Dynamic load acting on the wall of explosion

Open access

E. Drożdż, M. Jelonek, J. Wyrwa and M. Rękas

.M. Figueiredo, G.C. Mather, J.R. Jurado, J.R. Frade, Combustion synthesis and characterisation of Ni-MO-YSZ (M=Mg, Ca, Al 2/3 ) cermet anodes for SOFC, Journal of European Ceramic Society 27 , 4233-4236 (2007). [8] H. Orui, R. Chiba, K. Nozawa, H. Arai, R. Kanno, High-temperature stability of alumina containing Nikel-zirconia cermets for solid oxide fuel-cell anodes, Journal of Power Sources 238 , 74-80 (2013). [9] E.P. Butler, J. Drennan, Microstructural analysis of sintered high-conductivity zirconia with Al 2 O 3 additions, Journal of American Ceramic

Open access

A. Posmyk and H. Wistuba

Composite Layers with Ceramic Matrix Modified with Glassy Carbon Destined for Oil-Less Sliding Pairings

The paper presents basic knowledge about producing and some results of tribological and metallographical research on composite layers with porous, anodic hard coating matrix which were modified with glassy carbon nanotubes. These composite layers were formed as surface layers of machine parts operating under conditions of sparse lubrication (limited lubrication) and friction in air. The layers were tested at sliding mating with EN-GJL-350 cast iron used for piston rings in combustion engines and air compressors. On the basis of the metallographical tests was the structure of the composite layer described. It was fount that on the surface of the oxide is a glassy carbon layer and in the pores of oxide are regullary carbon nanotubes. On the basis of the obtained results of tribological tests it was found that glassy carbon layer on the oxide surface shorts the wering-in time, and the glassy carbon nanotubes formed inside the pores of anodic hard coating upon EN-AW-6061 aluminum alloy prove to be effective solid lubricants and complement lubrication function of the graphite in cast iron. Consequently the coefficient of friction was lower than in case of nanotubes-free oxide layers.