Miguel Angel Barbés

• Independent Researcher

Quantitative microstructural measurements of constituents of an Al-Si-Cu alloy, used to manufacture a part with thin sections by Pressure Die Casting (PDC), do not correspond to phase diagram calculations. A simulation of the liquid velocity when filling the mold was made in order to understand the relation between this parameter and pressure, cool...

The microstructure of Pressure Die Casting of an Al-8.5 Si-3.5 Cu alloy used for clean room tiles shows amount of constituents (eutectic and Si phases) that do not correspond to the ones indicated by the phase diagram. Furthermore, there are differences in amount of constituents between the core and the surface zones of parts produced by this proce...

During melting, reduction or thermal treatment of a steel charge, the input of energy (either chemical or electrical) is indispensable to guarantee the viability of the process. Under these circumstances, it will be reasonable to design the furnace lining in such a way that heat loss through the walls is minimized. Nevertheless, it can be proved th...

Steels with ultrafine grains (lower than 5 μm), which usually known as ultrafine ferrite or ultrafine grained materials, are presently the object of intense research, because of the improvement in resistance and fracture toughness they may reach compared to conventional steels (with grain sizes above this value). It is shown that the forenamed stee...

This study has of central aim to establish the physicochemical characteristics of the accretions present in an industrial furnace of sphalerite roasting (ZnS) operating at 945 ° C which, according to observations on plant, they are formed preferentially on surfaces at low temperature such as boiler output, cooling pipes and hoppers. The analysis by...

In modern steelmaking the duration of a working campaign for a blast furnace is related to the life of the crucible. Adding titanium oxide has been a frequent practice in the operation routines for modern blast furnaces, seeking the protection of the crucible walls, independently from its physical or chemical characteristics. These practices, as co...

The presence of thermocouples in the lining of crucibles has become a general practice in the new construction of blast furnaces. The Nodal Wear Model (NWM) has also emerged as an instrument that, while using experimental data, obtains nodal variables whose experimental measurement is not possible: global coefficient of pig-iron/refractory heat tra...

The industrial level production of ultrafine grained (or ultrafine ferrite) ferrous alloys was investigated through three examples of steels that complied with the EN 10149-2 Euronorm and were produced by advanced controlled hot rolling techniques. The steel samples were tension tested and chemically analyzed, and the microstructure was evaluated t...

Improvements developed in an electric furnace design for the production of refined ferromanganese (low carbon ferromanganese), using the Nodal Wear Model (NWM), are detailed in this paper. Likewise, the NWM can be used as an instrument which is able to simulate situations that have not yet been carried out on industrial scale and to predict, for ex...

The nature and properties of slag and dust generated during the manufacture of pig iron indicate the two possibilities of their utilization: sintering or cold agglomerating with Portland cement. Both sinter and pellets can be recycled in the LD converter. It was introduced the concept of "preformed synthetic slag" to use the recycling of waste. If...

Microtextural studies are often the basis for projects proposing improvements in the quality of refractory coatings that come into contact with aggressive molten material. The material used for this analysis either comes from laboratory-level corrosion tests or from furnace walls and linings that have come to the end of their working cycle. This a...

The coke porosity is one of the most important variables that can affect the pig iron production and the lining corrosion. Up to now, the existing bibliography about lining corrosion always connects a deeper wear to an increase in the fluid flow (pig iron) at the blast furnace hearth. However, there is no evidence of any deterministic model that co...

Corrosion of crucibles happens during the blast furnace operation, and it is important to make it as controlled as possible. The wear of the walls and the bottom of the crucible can be qualitatively estimated using temperature data and heat flux, but it is necessary to reach a better knowledge of the multiple mechanisms involved in its degradation....

Corrosion of crucibles happens during the blast furnace operation, and it is important to make it as controlled as possible. The wear of the walls and the bottom of the crucible can be qualitatively estimated using temperature data and heat flux, but it is necessary to reach a better knowledge of the multiple mechanisms involved in its degradation....

Los estudios microestructurales han estado frecuentemente en la base de proyectos orientados a la mejora en la calidad de los revestimientos refractarios destinados a estar en contacto con metales fundidos. Los materiales empleados en este trabajo proceden de las paredes de hornos que están en la fase final de su vida útil. El trabajo intenta asoci...

The wear and corrosion phenomena in the furnace lining of the ferrous and non ferrous pyrometallurgical processes are complex problems where chemical, interfacial and mechanical phenomena are presents. The characteristics of the processes determine the conditions to which these materials are submitted, where the thermal conditions reached during th...

En este trabajo se describe un modelo bidimensional basado en el método del elemento finito para calcular la distribución de temperaturas en un carro torpedo lleno de arrabio. El modelo determina los gradientes térmicos en condiciones estacionarias y transitorias dentro de las partes que constituyen el sistema considerado, como son cubierta de acer...

RESUMEN El conocimiento de los perfiles de temperatura a lo largo de la cuba de un alto horno resulta un instrumento de gran utilidad para conocer: a) las cargas térmicas y mecánicas que soportan la coraza metálica del horno y los materiales refractarios o metálico–refractarios en contacto con ella; y b) la distribución de temperaturas a lo largo d...