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D.C.: 574; 669.
Paul Tudor, Avram Nicolae: Steel Sustainable Material made by a Sustainable Iron and Steel
Industry
Metalurgia
(56) 2004, nr.9, p.5
Based on
principles of sustainable development modern concept, the new notions of
sustainable material and sustainable industrial branch are defined. Iron and
steel industry and steel itself are included in such kind of categories. For
support, different subjects are approached, for example: progress support,
improvement of added value chain, selfimproving of
the industrial branch, contribution to the social engineering priorities,
capacity to supply systems and natural capital preservation activity.
Key words:
concurrent
engineering
Mariana Pop: The concurent engineering, method
for reduction of development duration of products
Metalurgia (56) 2004, nr.9, p.15
Concurrent Engineering is
a systematic approach to the integrated, concurrent design of products and
their related processes, including manufacturing and support. It is known as
simultaneous engineering, concurrent design, integrated development of
products, team design, total engineering leading to reduce the time-to-market. The aim of this paper is to
present the main objectives of concurrent engineering and the possibilities
of reducing the time to market and costs.
D.C.: 669.3;
621.785.53
Key words: plasma nitriding, local
protection methods
Cristian Deac, Marius Bibu: The Elaboration of
Copper-Based Protective Layer used Against Plasma Nitriding
Metalurgia (56) 2004, nr.9, p.19
Beneath
the researches done up to now referring to the use on a large industrial
scale of the ionic nitriding, it is necessary to begin experiments concerning
the realisation of technologies for the local protection of metallic surfaces
against this process. The current study is based on the conceiving of pastes
or paints which prevent the nitrogen diffusion during the process. The
advantages and disadvantages of several methods of applying protective layers
against plasma nitriding, based on copper powders.
D.C.: 621.785.53; 667.636.22
Marius Bibu, Cristian Deac: Special Paints for the Local Protection at Plasma Nitriding
Metalurgia (56) 2004, nr.9, p.26
As a consequence of theoretical studies and of
experimental determinations carried out, a synthesis and
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an evaluation
of the characteristics of the pastes and paints used to protect the exterior
surfaces of metallic parts against the thermochemical treatment of
nitrocarburising is done. These properties refer to: stability and heat
resistance, homogeneity, physical and chemical stability, behaviour in
contact with chemical aggressive agents, resistance to corrosion, mechanical
and thermomechanical characteristics, refractoriness, density, porosity,
purity, granularity etc.
D.C.: 669.24;
546.21
Maria-Cristiana
Enescu, Marie-Rose Garda, Jean-Marc Saiter: characterisation of physico-chemical proprieties
of some polymer mixtures, utilised as biocompatible
materials
Metalurgia (56) 2004, nr.9, p.33
Polymeric
materials have a large utilisation in the field of
biomaterials, tests for improvement of their proprieties being all the time
performed, in order to produce materials with better biocompatibility. For
study, three series of polymeric mixtures, had the
target to analyse the physico-mechanical.
For this purpose the following analysis method have
been performed: differential calorimetric analyse
(DSC 7; TA), thermomechanical analyse
(TMA-DMA, viscoanalyser), thermogravimetric
analyse (TG) and spectrophotometric
studies (FTIR).
The first
series is represented by PU2000/PC,
the second one by PU/CPL, and the third one by PUF/CPL. The polymeric
mixtures were produced in different compositions (%), in order to see which is the composition with the best behaviour.
The best behaviour was presented by the first
series PU2000/PC with compositions 50/50; 15/85; 5/95.
Abreviations: : PU2000 polyuretane
with molecular was 2000, PU-polyuretane, PUF-polyuretane with flour atoms, CPL-polystiren,
copolimerized acrylic acid, PC-bysphenol
polycianurate.
Key words: diffusivity, oxygen, nickel, capillary gas-reservoir, Ficks second law
Vasile Hotea,
Mariana Zsigmond, Gheorghe Iepure: Diffusion of oxigen in liquid nickel
Metalurgia (56)
2004, nr.9, p.42
The diffusivity of
oxygen in liquid nickel determined from 1400oC to 1600oC
by a capillary gas-reservoir method. A diffusion cell designed to behave as
if of semi-infinite length and consisting of liquid nickel held in an alumina
capilary was used. A H2O-H2 gas mixture maintained a
constant oxygen potential at the metal-gas interface. Oxygen diffusivity, D,
were calculated through use of a solution of Ficks second law.
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