D.C.: 621.762.5;621.783.237

Key words:refractory ceramic materials, sintering, tunnel kiln, cooling zone, algorhythm

Avram Nicolae, Cristian Predescu, Adrian Ioana, Neculai Murguleţ, Vasile Luca:Algorhythmesrequired forcoolingzonedesigning oftunnelkilns forrefractorymaterialssintering

Metalurgia (55) 2003, nr.8 p.5

D.C.: 669.018.25

Key words:graphite, resin, tin powder, blending, polymerization, sintering

Daniela Florentina Tărâţă, Alina Duţă:Resin-graphite-tincomposites forslidingbearings,resistant attemperatures up to 250⁰C

Metalurgia (55) 2003, nr.8, p.9

Results of investigations for production of resin-graphite composites, reinforced with tin, are presented in the paper. These composites, working without lubricants have wear and high temperature resistance, up to 250⁰C.

D.C.: 621.318.2

Adrian Catangiu , Lucica Toma, Wilhelm Kappel, Ştefania Alexandru:Anisotropicsinteredpermanentmagnets

Metalurgia (55) 2003, nr.8, p.11

 Sintered permanent magnets, using binder, are composite materials combining magnetic performances of magnetic powder, with improved mechanical characteristics, as compared to sintered permanent magnets. These improved characteristics, are due to the presence of organic binder (epoxy resins) or of metallic binder (zinc). This type of magnets present also a higher temperature stability. The maximal working temperature is limited by the resine type, representing the matrix for magnetic powders. Some of results, performed by the authors, regarding anisotropic sintered permanent magnets, are presented in the paper.

The economic effects are still under considerations.

D.C.: 621.193;669.5

Key words:Constructions, Zinc sheet, Corrosion

Maria Dinescu, Irina Jula, Georgeta Coşmeleaţă, Brânduşa Ghiban:Corrosionaspects ofzinc used inconstructions

Metalurgia (55) 2003, nr.8, p.18

Metals like zinc are used for a lot of building appliances. This is one of the reasons why problems concerning their corrosion are extremely important. The anodic positions of zinc on the potential scale also its specific chemical and metallurgical characteristics are conferring a certain place within the metal class used on the above-mentioned field. It is well-known that the environmental corrosion resistance of zinc is superior to that of other metals; but this resistance, under certain technological processing conditions and a certaininclusionarystate of the metal decreases very much, thus explaining why the reliability of the product diminishes. The paper presents concrete environmental corrosion forms found on various zinc sheets, which were used temporarily as roof for some patrimony buildings:CotroceniPalace, Romanian Athenaeum,SinaiaCasino.

D.C.: 669.13;681.3

Key words:blast furnace, ORACLE,informatisedmanagement

CristianViorel Semenescu, Mircea Costache, Nicolae Constantin, Diana Ioniţă, Augustin Semenescu :Ironmakingoptimization bycomputerassistedoperation inblastfurnaces. Part II. Utilization ofsoftwareapplication „blastfurnace” forironmakingoptimization bycomputerassistedoperation

Metalurgia (55) 2003, nr.8, p.23

In this part of thescientificalresearch paper is presented the software application called: Reckoning furnace, which is realized having as support the mathematical model presented in the first part of the research.

There is presented the way ofrealisationandutilisationof theinformaticalprogrammewhich helps the computerized leading of the elaboration of cast iron in the blast furnace process. There are a lot ofways ofusing different ores, fuels and limestone charges.

Theinformaticalprogrammerealized allows the fast reckoning of the quantity and composition of the cast iron, the slag, the blast furnacegase, the materials andenergeticalbalances at the elaboration of the cast iron.

D.C.: 539.319

Key words:residual stresses , blind hole method, strains gauges, finite-element method

Nicolae Bal, Mircea Bejan, Mihai Hărdău,Virgil Ispas:Usingnumericalmethods of thestraingauge used todetermine theresidualstresses

Metalurgia (55) 2003, nr.8, p.30

When using the blindholemethod for determining the residual stresses, the strain gauge used to measure the strains should be calibrated by experiments. In order to do calibration of the strain gauge, the finite-element method has been used. The paper presents an analysis of both the analytical, numerical and experimental results.