KONV

BÁNYÁSZATI ÉS KOHÁSZATI LAPOK

MISKOLCI EGYETEM FORR-ÁSZ PROJEKT TÁMOP-4.2.2.A-11/1/KONV-2012-0019 Anyagtudomány Felsőoktatás Hírmondó 148. évfolyam 2015/3. szám

Jó szerencsét!

Az Országos Magyar Bányászati és Kohászati Egyesület lapja. Alapította Péch Antal 1868-ban.

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Gácsi Z. – Batta B.: Környezetbiztonságos forraszanyagok anyagtudományi alapon történő fejlesztése primer- és másodnyersanyagokból a járműipar számára Benke M. – Sályi Zs.: Szelektív forrasztószerszámok tönkremeneteli mechanizmusa Simon A. – Géber R. – Lipusz D. – Gácsi Z.: Rézmátrixú kompozitok jellemzése, kísérleti előállítása Gyökér Z. – Terjék A. – Gyenes A. – Gácsi Z.: Az ezüst és a réz hatása az Sn-AgCu forraszanyagok szövetszerkezetére és mechanikai tulajdonságaira Téglás N. – Gyenes A. – Nagy E. – Gácsi Z.: Többalkotós Sn-Ag-Cu alapú ólommentes forraszanyagok vizsgálata Baumli P.: A keményforrasztás alapanyagai Kékesi T.: Ólommentes forrasztási ónhulladék teljes feldolgozása rugalmas és környezetbarát módszerrel Lassú G. – Török T.: Kísérleti lehetőségek egy újszerű analitikai módszerrel a tűzzománc–acél mennyiségi mélységprofil-elemzésére, és az eljárás elvi alapjai Rontó V. – Tranta F. – Svéda M. – Roósz A.: Hozzáadott cink hatása az Sn-Bi forraszötvözet szerkezetére és kristályosodási tulajdonságaira Szabó G. – Mertinger V. – Zupkó I. – Mikó T. – Roósz A.: Meleghengerléssel plattírozott többrétegű alumíniumlemezek technológiai vizsgálata A 2015/3. szám szerzőinek szakmai életrajza

Anyagtudomány 43 Mekler Cs. – Baranyai V. – Dezső A. – Trampus P. – Kresz N. – Kaptay Gy.: A szemcsehatár-energia, a szemcsehatárszegregáció és a szemcsehatár-átalakulás modellezése többkomponensű ötvözetekben Felsőoktatás 50 Beszélgetés prof. dr. Kékesi Tamással 52 Beszámoló a XXXII. Országos Tudományos Diákköri Konferenciáról Hírmondó 56 100 éve született Óvári Antal. Tisztesség és tisztelet 57 120 éve született az ajkai timföldgyár és alumíniumkohó építője 58 Egyesületi hírek 60 MÖSZ-hír 65 Köszöntések 66 Nekrológok

Öntészet rovatunkat az 1950-ben indított és 1991-ben megszûnt önálló szaklap, a BKL Öntöde utódjának tekintjük.

F R O M T H E CO NT EN T Benke M. – Sályi Zs.: Degradation mechanism of selective soldering tools ... ... ... ... ... ... ... ... ... ... 2 The soldering tool is in direct contact with the molten solder alloy. The soldering tools are typically made from ferrous alloys, or high purity Armco iron. Today’s solder alloys are tin-based alloys which are highly reactive and solve the iron atoms from the soldering tools. This process leads to the erosion degradation of the soldering tools, which requires the halt of the soldering line and the replacement of the soldering tool. The erosion process can be inhibited through the composition modification of the solder melt. However, for most cases, the composition of the solder melt is strictly regulated, leading to the need for the development of soldering tools with enhanced lifetime against erosion. Simon A. – Géber R. – Lipusz D. – Gácsi Z.: Characterization and experimental producing of copper matrix composites ... ... ... ... ... ... ... ... ... 4 The improvement of properties of conventional materials is possible with the use of another coupling materials. The application of these kind of composite material systems can be observed in many areas of industry (e.g. manufacturing of electronic parts). In this article the Authors review the main properties of metal matrix composites, as well as manufacturing methods, main properties and applications of copper matrix composites. During their research work copper matrix composites reinforced with SiC particles were produced and some results of their investigations were presented. Gyökér Z. – Terjék A. – Gyenes A. – Gácsi Zoltán: Effects of silver and copper on the microstructure and mechanical properties of Sn-AgCu solders ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 9 After the switch to lead-free solders Sn-Ag-Cu (SAC) alloys have been proved to be the most sufficient solders among the current alternative ones in the terms of replacing lead-containing solders. One of the most common SAC solders is the SAC305 alloy which contains 3 wt% Ag and 0.5 wt% Cu. This paper investigates the effects of Ag and Cu on the microstructure and the mechanical properties of SnAg-Cu lead-free solders via alloys with five different compositions. Light and scanning electron microscopy with microprobe analysis were used to describe the effects of the alloying elements on the microstructure. Further-more tensile tests and hardness measurements were applied to determine the mechanical properties (UTS, YS, HV and elongation). Téglás N. – Gyenes A. – Nagy E. – Gácsi Z.: Investigation of multicomponent Sn-Ag-Cu based lead free solders ... ... ... ... ... ... ... ... ... ... ...14 According to the directives adopted by the European Union, lead has been banned from the manufacturing processes because of its health and environmental hazards. Therefore the development of lead-free solder has started up. This paper investigates multicomponent Sn-Ag-Cu based leadfree solders with different compositions. The properties of the Innolot and two low-Ag solders were compared with the widespread SAC305 in the industrial practise. Microstructure investigation and X-ray diffraction measurements were performed to identify the formed phases, furthermore tensile tests and hardness measurements were executed to determine the mechanical properties.

Baumli P.: Base materials of brazing ... ... ... ... ...18 Brazing is a joining process (above 450 °C) in which two or more items are joined together by melting a filler metal. The filler metals have lower melting point than the brazed parts. Irresolvable bonding between metal and metal, ceramic and ceramic or ceramic and metal can be made by brazing. The quality of joining largely depends on the correct composition of the filler material. Most widely used types of filler metals are copper and its alloys, nickel and its alloys, as well as pure silver and silver-based alloys furthermore aluminium, magnesium, zinc or titaniumbased filler can be applied. The results of research on brazing and joining are summarised in this review. Kékesi T.: Complex processing of lead-free soldering waste by a flexible and environment friendly method ... ... ... ... ... ... ... ... ... ... ... ... ... ...22 The significant amount of the waste material arising from the application of the most common SAC-type lead-free soldering tin alloys, containing Ag and Cu, can be processed practically free of any emission by a multi-step method based on an aqueous electrorefining step. The first step is the melting of the heterogeneous waste material skimmed from the soldering bath, which serves the melt to be cast into cooled molds to form the anodes. The oxide dross here separated can be subjected to a carbothermic reduction to yield finely dispersed tin, soluble in hot hydrochloric acid. This may be used for the preparation of the electrolyte solution. The properly controlled refining electrolysis can produce high purity tin at the cathode, while silver and copper is concentrated in the slime layer arising at the surface of the anode. The Sn, Cu and Ag content of the slime can be dissolved selectively by consecutive leaching steps using hot hydrochloric and nitric acid solutions. Pure tin can be extracted from the chloride solution after removing copper by cementation, followed by silver chloride precipitation from the nitrate solution. This method, developed at the laboratory scale can be operated economically on a low capacity as well, as no sophisticated equipment needs to be invested and no expensive materials or considerable electric energy are required. The negligible amount of the technological residue is practically tin dioxide, which can be recycled to the melting step. Lassú G. – Török T.: Application possibilities and the principle of a novel analytical technique for compositional depth profile measurement of the steel-enamel interface ... ... ... ... ... ... ... ... ... ... ...29 In this paper we publish the principle of elemental /quantitative depth profile analysis of the steelenamel interface and the methodological development which leads to this possibility. In our previous paper [1] we showed how powerful the analytical technique GD-OES is for analyzing the entire enamel coating and the interface region (which is very important from the aspects of bonding). In that article we presented only qualitative depth profiles, because we were unable to commence the full calibration procedure due to lacking the proper reference standard samples. By now and in collaboration with the TOBIZO Co. eventually we could prepare some quasi-standards and we can use them for quantitative calibration. The quantified depth profiles then will supply extra information compared to the qualitative ones, i.e. not only the trends but the exact compositional conditions can be determined in the whole depth of such coatings as well. Continued on page 64.

• Szerkesztôség: 1051 Budapest, Október 6. utca 7., III. em. • Telefon: 06-1-201-7337 • • E-mail: [email protected] • • Felelôs szerkesztô: Balázs Tamás • • A szerkesztôség tagjai: dr. Buzáné dr. Dénes Margit, dr. Klug Ottó, dr. Kórodi István, Lengyelné Kiss Katalin, Schudich Anna, Szabados Ottó, Szende György, dr. Tardy Pál, dr. Török Tamás • • Kiadó: Országos Magyar Bányászati és Kohászati Egyesület • Felelôs kiadó: dr. Nagy Lajos • • Nyomja: Press+Print Kft. 2340 Kiskunlacháza, Gábor Áron u. 2/a • HU ISSN 0005-5670 • Belsô tájékoztatásra, kereskedelmi forgalomba nem kerül. • A közölt cikkek fordítása, utánnyomása, sokszorosítása és adatrendszerekben való tárolása kizárólag a kiadó engedélyével történhet. • Internetcím: www.ombkenet.hu/bkl/kohaszat.html

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