Refractory demand is driven by growth in emerging markets, new processing technologies and products in the customers industries mainly iron and steel, cement, lime, non-ferrous metals, glass, environmental, chemical and energy industry. The need for high-quality refractory solutions for particular applications is steadily rising. Ste...

By CHRISTIAN MAJCENOVIC

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By MOHAMMAD SAFI

The calibration measurement capability - CMC is defined as the smallest uncertainty that a laboratory can achieve within its powers when carried out more or less daily calibration of nearly ideal measurement standards intended to define, generate, keep or renew units of that size, or one or more of its value, or when carried out more...

By BRANKA MUMINOVIĆ, MIRSADA ORUČ, ALMAIDA GIGOVIĆ-GEKIĆ, RAZA SUNULAHPAŠIĆ

ISO 9001 is an international standard that includes requirements for a quality management system in a business organization that it must meet in order to operate in compliance with internationally recognized standards. Benefits of implementing this standard in organizations are large and besides the ability to sell and produce t...

By MIRSADA ORUČ, DRAGANA AGIĆ, FUAD KLISURA, NEIRA DELIĆ

Oil pump, apropos gear pump is used for lubrication in the automotive industry. In the process of the engine, and the oil pump, there is rotation of the shaft and without bearing sleeve there would be „spending”casing which is made of cast iron. The bearing sleeve is mounted in order to reduce wear and ensure the consiste...

By BELMA FAKIĆ, ADISA BURIĆ, EDIB HOROZ, AMIRA PAŠALIĆ, ELVEDIN ĆOSATOVIĆ

Nanotechnology relates to the production and management of the materials whose phases dimensions are (grains of structure and manufactured of layers) up to 100 nm. Nanotechnology and nanomaterials lead to major breakthroughs in many areas of scientific research with practical application in the industrial sector. The global mark...

By MIRSADA ORUČ, SULEJMAN MUHAMEDAGIĆ, ALMAIDA GIGOVIĆ-GEKIĆ, RAZA SUNULAHPAŠIĆ

Many types of alloys are available as dental implants, but titanium and its alloys have been widely used due to their outstanding properties. In this research titanium alloys with different Zr contents were prepared by arc-melting. Phase identification was performed by XRD analysis. Microstructure was observed by light microscope aft...

By LJERKA SLOKAR, ANITA ŠTRKALJ, ZORAN GLAVAŠ

Ratio of ultimate tensile strength and yield stress shows lower values in cold drawn wire than in hot rolled state. The results of research addressing the effect of variations in chemical composition of continuous casted billets on mechanical properties of cold-formed wire used in production of steel mesh are presented. In the c...

By ŠABAN ŽUNA, AIDA MAHMUTOVIC, FAIK UZUNOVIĆ, SEAD SPUŽIĆ

KAB steels are a newly developed grade of advanced ultra high strength steels, which distinguish themselves by the rapid formation of fine nanostructured carbide free lower bainite. The term nanostructured is used with respect to the thickness of the individual bainitic ferrite plates which can vary between 50 nm to as fine as a few ...

By PETER KIRBIŠ, MIHAEL BRUNČKO, IVAN ANŽEL

Shape memory alloys (SMAs) are advanced functional materials suitable for technical applications. Among them Cu-Al-Mn alloy is a promising candidate for industry applications (mechanical engineering, electro-engineering etc.) due to their ductility. In this work analysis of the Cu-Al-Mn alloy after smelting and casting in the laborat...

By MIRKO GOJIĆ, STJEPAN KOŽUH, IVANA IVANIĆ, TAMARA HOLJEVAC-GRGURIĆ, ROBERT PEZER, IVAN ANŽEL, BORUT KOSEC, MILAN BIZJAK, LADISLAV VRSALOVIĆ, DRAGANA ŽIVKOVIĆ

High strength low alloy (HSLA) steels represents a group of low carbon steels that utilise small amaunts of alloying elements, such as Mo, Ti, V and Nb, to attain yield strengths in excess of 275 MPa in the as rolled condition. The main properties of HSLA steels that make them for wide variety of applications are: strength and toughn...

By GORAZD KOSEC, JELENA VOJVODIĆ-TUMA, MIRKO GOJIĆ, BORUT KOSEC, MILAN BIZJAK, ALEŠ NAGODE

Austempering is two steps heat treatment process that, when applied to ductile iron, produces components that have properties superior to those processed by conventional treatment. Depending to chosen heat treatment parameters different final properties of the casting are obtained. In this paper heat treatment parameters for producti...

By HASAN AVDUŠINOVIĆ, ALMAIDA GIGOVIĆ-GEKIĆ

Cu-alloys have been intensively studied because of their high thermal conductivity, good electrical and shape memory properties and low cost. Cu-Al-Mn alloys show a higher ductility and elongation in relation to the other Cu-based alloys, as well as a good potential for a cold drawing. Therefore, the investigation of these alloys is ...

By TAMARA HOLJEVAC-GRGURIĆ, DRAGAN MANASIJEVIĆ, DRAGANA ŽIVKOVIĆ, LJUBIŠA BALANOVIĆ, STJEPAN KOŽUH, ROBERT PEZER, IVANA IVANIĆ, IVAN ANŽEL, BORUT KOSEC, LADISLAV VRSALOVIĆ, MIRKO GOJIĆ

Based on microscopic (exciton) theory of optical properties of symmetrically perturbed ultrathin molecular films, the absorption, reflection and transparency indices were formulated and presented in the function of frequencies of external electromagnetic field in near IR region. It has been showed that all optical properties depend o...

By SINIŠA VUČENOVIĆ, DRAGANA RODIĆ, JOVAN P. ŠETRAJČIĆ

Nanometalic materials are at the present moment the most commercialized class of nanomaterials. Methods for their synthesis and exploitation of the physical phenomena of their behaviour on atomic level are ever-expanding. Their prices are sometimes too high and in lowering the price, finding the new recourses of raw materials, would ...

By SUZANA GOTOVAC-ATLAGIĆ, SINIŠA VUČENOVIĆ, TONI NIKOLIĆ, ANĐELA TOMIĆ, DRAGANA STEVIĆ

FeCrAl alloys are used in a wide range of resistance and high-temperature applications such as wire heaters, furnace structure parts, etc. Their oxidation resistance at elevated temperatures relies on the formation of a thin and a continuous Al2O3 layer on the alloy surface. Growth and thickness of the protective Al2O3 layer depends ...

By STOJANA VESKOVIĆ, JANEZ KOVAČ, PETER PANJAN, DAMJAN KLOBČAR, MILAN BIZJAK, BLAŽ KARPE

This paper examines the impact of charging wet and oxidized material on the quality of cast iron, quality SL20. In consideration were taken the same products obtained from 3 melts. For the production of the first melt wet and oxidized charging components in quantity of 60 % were used, for the second one quantity of 20 % of oxidizied ...

By AJLA HUSELJIĆ, AIDA MAHMUTOVIĆ, HASAN AVDUŠINOVIĆ

Ductile iron is a pseudo-binary alloy of iron and carbon where the carbon is precipated in the form of nodules (spherical) graphite. The ductile iron, thanks to the specific form of graphite, has a good combination of properties such as elongation, yield strength, good toughness, castability and mechanical workability. Except of grap...

By ALMAIDA GIGOVIĆ-GEKIĆ, EMANA ĐANANOVIĆ, HASAN AVDUŠINOVIĆ

The practical objective of this paper was based on improving the cleanliness of forging ingots, improving the ingots yield by the reduction of ingot head, taking the example carbon steels produced in Steelwork Zenica In that sense, the modification of existing technologies has been done in the segment of secondary metallurgy dur...

By OMER KABLAR, AIDA MAHMUTOVIĆ, MENZUR PLAĆO, ŠABAN ŽUNA

Stainless steel plays an important role in all emerging technologies. Detrimental effects of inclusions in steel do not only depend on their sizes, shape, distribution, but also on their chemical composition and mechanical properties. For this reason, the control of formation of non metallic inclusions and the characterization presen...

By DERVIŠ MUJAGIĆ, AIDA MAHMUTOVIC, MUSTAFA HADŽALIĆ, AMNA KARIĆ

This paper examines the impact of improving working conditions and increasing capacity with Dual track system. Three different cases were examined: Power ratio 100-650 kW, 200-550 kW and 300-350 kW. All three different cases were obtained in very similar conditions (time necessary for chemical analysis, alloying processes, slag cleaning e...

By ŠEHZUDIN DERVIŠIĆ, SEDAD MUŠINOVIĆ, AJLA HUSELJIĆ

In this paper will be presented a practical example of the fuel savings in the process of hot-dip galvanizing. Reconstruction of the line is carried out during the transition of equipment from one to another location. Total power of the melting furnace it was 2.4 MW, and hot air generator for drying oven, has a power of 600 kW. With ...

By JUSUF DURAKOVIĆ, SEDAD MUŠINOVIĆ, NERMIN HERO

The complicated reactions are appeared in the liquid iron under the influence of interaction parameters of basic and added elements during oxidation or addition of certain elements. These reactions may explain the appearance some of phenomena during the production with the negativeconsequences on the final material. Some phenomena as defe...

By DERVIŠ PIHURA, DERVIŠ MUJAGIĆ, DŽEVAD NOVIĆ

The austenitization is first operation at most operations of heat treatment, and it is implied heating steel on the austenitizing temperature and holding at this temperature while are not achieved completely transformation origin microstructure in austenite. Two base parameters which implicate at effect of austenitization are austeni...

By ARMINA BAŠIĆ, ALMAIDA GIGOVIĆ-GEKIĆ, HASAN AVDUŠINOVIĆ, MUSTAFA HADŽALIĆ

Phase diagram of the Al-Sn-Ga ternary system was calculated using optimized thermodynamic parameters for binary sub-systems based on CALPHAD method. Four vertical sections were calculated: Ga0.5Sn0.5-Al, Al0.5Sn0.5-Ga, Al0.5Ga0.5-Sn, and Al0.9GaSn0.1-Ga. Calculated liquidus projection of the Al-Sn-Ga ternary system and isothermal sec...

By LJUBIŠA BALANOVIĆ, DRAGANA ŽIVKOVIĆ, DRAGAN MANASIJEVIĆ, JOŽEF MEDVED, MAJA VONČINA

This article talks about the possibility of production of portland-composite cement in cement plant Kakanj in accordance with the requirements of EN 197-1. By that standard cement class 52,5N must have a compressive strenght greater or equal 20MPa after 2 days, and after 28 days greater or equal 52,5MPa. Portland-composite cement is ...

By NEVZET MERDIĆ, ILHAN BUŠATLIĆ, NEDŽAD HARAČIĆ, NADIRA BUŠATLIĆ

In various packaging forms, materials are found directly or indirectly related to the packaged food product and for that reason, they must meet the requirements that enable complete, or within acceptable limits, health and hygienic food safety. During the interaction process of packaging-food contact, the migration of packaging compo...

By IFET ŠIŠIĆ, OSMAN PERVIZ

Polymer bonded Nd-Fe-B magnets belong to the group of functional composite materials, which consist mainly of two components: a polymer binder (PPS, PA) and magnetic particles of Nd-Fe-B alloy. The appropriate amounts of polymer binder, magnetic powder and additives are compounded by the twin screw extruder into a compound, that can ...

By MIHAEL BRUNČKO, PETER KIRBIŠ, IVAN ANŽEL

The paper presents investigation of the influence of water to cement ratio, w/c, to speed the corrosion of concrete and reinforcing steel in concrete caused by salts of magnesium. The samples were preparatory varying w/c (0,5 and 0,7). The test samples were treated nine months in the following solutions: 5% MgCl2, 5% MgSO4, 5% MgCl2 ...

By FARZET BIKIĆ, DEJANA BRKIĆ

Research focus of this paper are stresses in concrete, reinforcement and tendons, cracks and deflections of the prestressed girders of “Type A” in order to optimize the span of such girder for the same amount of tendons and reinforcing steel. Serviceability Limit State (SLS) is a condition in which construction ceases to ...

By HUSEIN OKUGIĆ, SANIN DŽIDIĆ

For the development of refractory coatings with controlled rheological properties the influence of micronized milling process was investigated. Change the properties of fillers based on cordierite, primarily on changing the size and shape of grain fillers, dispersion and stability of the suspension of the coating was investigated, al...

By MARKO PAVLOVIĆ, MARINA DOJČINOVIĆ, TATJANA VOLKOV-HUSOVIĆ

There is something inherent, compelling and mystified in ruins and remains of the old fort. The issues logically imposed at the first encounter with these witnesses of the past are linked to their current condition, age and role in history. Historically, all those fortresses were more than the fortified military structure. They have ...

By AMIR ČAUŠEVIĆ, NERMAN RUSTEMPAŠIĆ, LANA KUDUMOVIĆ

The effect of fly ash, coal dust and limestone on the properties of brick products are presented in this paper. Three kinds of clay were used to test the effect of additives. There were investigated the effect  of additives on the behaviour of clays during drying and firing (shrinkage and loss of weight), and the  properties of fired samp...

By MARINA JOVANOVIĆ, ADNAN MUJKANOVIĆ, ERNA TUTIĆ, VEDIJA KARALIĆ

For the production of self-compacting concrete for a specific application, with desired properties in fresh and hardened state, it is necessary to combine the constituent materials in the optimum proportions. The proportioning of self-compacting concrete has to start with defining the required properties. For a particular application, a self-compac...

By ADNAN MUJKANOVIĆ, ILHAN BUŠATLIĆ, MARINA JOVANOVIĆ, DŽENANA BEČIRHODŽIĆ

In recent decades the production of chemically bonded refractory materials has been clearely increased. In this paper was examined the added amount effection of 50% solution of mono aluminum phosphate (MAP) as a binder in refractory concretes. Quartz, sand and chamotte are used as fillers. Research has shown that the bond between the filler and the...

By NADIRA BUŠATLIĆ, ILHAN BUŠATLIĆ, MITAR PERUŠIĆ

Cement is a mineral hydraulic binder which is formed by sintering (heat treatment) primary minerals of cement clinker at a sintering temperature. In the cement composite only cement releases heat by reaction with water, and image about the amount of heat or about temperature of solid concrete is obtained by determination of the heat of hydration of...

By ILHAN BUŠATLIĆ, NEVZET MERDIĆ, NEDŽAD HARAČIĆ, AMNA KARIĆ, SUMEJA HIBOVIĆ

In this paper the effect of two different fly ash types on the properties of self-compacting concrete in fresh state and hardened state was investigated: fly ash from Thermal power plant “Kakanj” and fly ash from Thermal power plant “Tuzla”. The results of testing fresh self-compacting concrete properties show that addition ...

By ADNAN MUJKANOVIĆ, ILHAN BUŠATLIĆ, MARINA JOVANOVIĆ, DŽENANA BEČIRHODŽIĆ

Hygienic and quality assessment of milk have the primary role in the diet and health of every consumer. Contemporary work in the production, preparation, primary processing, milk processing and storage of milk, looks for well- organized laboratory services contro on the all way from the barn and producers to dairies and distribution or storage of m...

By HAJRUDIN SKENDER, SANELA PATKOVIĆ, AZRA HALILOVIĆ

Lake of Shkodra as the largest lake in the Balkan Peninsula forms a relatively complex ecosystem. One of the most important indicators of this ecosystem is also the quality of air. Air quality can be estimated based on several viewpoints, using physical or chemical parameters. In this study, the work is based on estimation of particulate matter con...

By JOZEF BUSHATI, FLORIAN MANDIJA

In the city of Zenica steel is continuously produced more than 120 years. In all technological stages of production and processing of steel within integrated steel works large amounts of raw materials and fuels which contain a certain amount of sulfur are consumed. The flue gases formed during production and processing of steel contain certain conc...

By SULEJMAN MUHAMEDAGIĆ, MIRSADA ORUČ, HALIM PRCANOVIĆ

The main objective was to reduce: the time of the bus stops, the time for administrative actions of drivers, fuel consumption, air pollution emissions of SO2 and increase the solvency of the company. For the realization of the objectives set was needed: to introduce electronic billing system with the use of contactless - chip cards. All vehicles ar...

By JUSUF BORIĆ

The most used and established method for detecting the effects of the product on the environment is a life cycle assessment (LCA) method. LCA analyzes the effects of the product on the environment in its all five life stages: design, materials selection, manufacture, use, and ultimately its removal. At the same time LCA is an important tool wh...

By BORUT KOSEC, BLAŽ KARPE, DRAGAN GOGIĆ, ALEŠ NAGODE, IGOR BUDAK, MILANA ILIĆ, GORAZD KOSEC, ZORANA TANASIĆ, GORAN JANJIĆ, MIRKO SOKOVIĆ

Parameters which define environment conditions are largely qualified with influence of the Kostolac A and Kostolac B energy plants and surface mining of lignite. The air quality is examined continuously by measuring total deposited matter and the emissions of gases such as CO2, SO2, NOx, CO, O3. It is found that pollution substances significantly e...

By STEVA K. JAĆIMOVSKI, SLOBODAN MILADINOVIĆ, JOVAN P. ŠETRAJČIĆ, SINIŠA M. VUČENOVIĆ

The increase in energy prices in the world, then the realization of less dependence on energy imports, and in particular meeting the hierarchical concept of waste management as it is in the EU, including reducing emissions of greenhouse gases (GHG Greenhouse Gases) in accordance with the Framework Convention of the United Nations Convention on clim...

By MAHMUT JUKIĆ, IFET ŠIŠIĆ

Because of the oil shortage and the growing increasing environmental burdens-emission from motor vehicles, the idea of the biofuels application has been actualized. The European Union directive 2003/30/EC obliged Member States that until 31 December 2005, they must provide at least 2% share of biofuels and other renewable fuels in the total amount ...

By ŠEFKIJA BOTONJIĆ, ILHAN BUŠATLIĆ, AZRA HALILOVIĆ, ADNAN MURATOVIĆ

Water that is commonly used for drinking is groundwater, that appears on the surface of the Earth's crust as sources of different types and capacities, and in most cases that water is chemical, physical and bacteriological acceptable and suitable for use. In some cases, there is some blurring of water, that is the result of heavy rainfall or some h...

By ŠEFKIJA BOTONJIĆ, ILHAN BUŠATLIĆ, AZRA HALILOVIĆ, ALMIN ORUČ

Today there is a growing research activity in order to investigate the possibility of using various waste or alternative materials in the cement and other industries. In this paper the possibility of using wood paulownia (lat. Paulownia elongata) as a completely new type of alternative fuel has been analyzed. Its applicability in cement industry in...

By ZEHRUDIN OSMANOVIĆ, NEDŽAD HARAČIĆ, JELICA ZELIĆ

Refractory materials are an important part of industrial furnaces and metallurgical aggregates. With time and use, the wear out of refractory materials ocures and their replacement becomes necessary. Part of refractory material, which is removed after the demolition of industrial furnaces and metallurgical unit refractory linings, represents refrac...

By MENZUR PLAĆO, OMER KABLAR

The paper presents preliminary analysis of the impact of the season and time of day on the content of benzene, toluene, ethylbenzene and xylene in the air of the city of Zenica. This analysis is carried out on the basis of data on the measurement of concentrations of benzene, toluene, ethylbenzene and xylene downloaded from the Metallurgical Instit...

By FARZET BIKIĆ, ASIM IBRAHIMAGIĆ, HASNIJA BERBIĆ, HALIM PRCANOVIĆ