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Lutowanie ceramiki AlN ze stopem FeNi42 za pośrednictwem powłoki metalizacyjnej osadzanej tarciowo

Hudycz M., Chmielewski T.

Przegląd Spawalnictwa

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2016

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R. 88, nr 9

146--148

PL

Złącza ceramiki z metalami bazują na wysokotemperaturowych, długotrwałych procesach próżniowych, głównie o charakterze dyfuzyjnym. Opisane w artykule badania są częścią pracy badawczej ukierunkowanej na opracowanie technologii tarciowego osadzania powłok metalizacyjnych na ceramice w celu ułatwionego spajania, w tym lutowania ceramiki z metalami. W celu uproszczenia procesu lutowania ceramiki z metalami na powierzchni ceramiki konstrukcyjnej wytwarzana jest cienka powłoka metaliczna ułatwiającą lutowanie z metalami z wykorzystaniem lutów nieaktywnych w osłonie gazów. W pracy zaprezentowano wstępne wyniki badań złączy lutowanych ceramiki AlN ze stopem FeNi42 uzyskanych za pośrednictwem tarciowo osadzanej powłoki metalizacyjnej.

EN

Ceramics-metal joints usually are obtained in high-temperature and long-time vacuum processes where the mechanism for the creation of interface is based on the diffusion phenomena. The research has been reported at this article is the part of the bigger scientific project focused on friction metallization of ceramic surface. In order to simplify the process of brazing metals to the ceramics a thin metallic coating is deposited onto ceramics surface by friction surfacing. Due to the intermediate metallic coating brazing process of the ceramicmetal joints can be realized by inactive solder in atmosphere of inert shielding gas. The preliminary results of ceramic AlN with alloy FeNi42 brazing process obtained through friction-deposited coating have been reported.

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Microstructure of metallic layers sintered on nitride ceramics depending of the chemical composition of interlayers

Olesińska W.

Materiały Elektroniczne

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2002

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T. 30, nr 3

28-38

EN

The effects of the oxygen and titanium contents in the reactive layer deposited on nitride ceramics on the wettability and sintering capability of the metallic layers were examined. The deposited metallic layers were standard Mo and Mn layers with the oxygen content ranging from 0 to 40 at.% and the titanium content from 0 to 8 at.%. The layers were sintered at a temperature between 1573 and 1653 K in a hydrogen atmosphere (dew point - 203 K). In the a transition layers, between the Al2O3, or AIN ceramic material and the metallic layer, a continuous glass layer is formed on the ceramic surface, which wets very well both the substrate and the metallic powders.The microstructure of the metallic layers was examined using a scanning electron microscope and an electron probe. It has been found that both Al and Si migrate strongly to the interface layer. The microstructure of the metallic layers sintered on AIN differs from that of the layers sintered on alumina ceramics. In the interface layer formed between the ceramic material and the metallic layer, a continuous glass layer forms on the ceramic surface; the glass wets very well both the substrate and the metallic powders. The metallic layer is compact, and the solder does not flow in-between the grains. Based on the results of the microstructural examinations, the mechanisms of the sintering of Al and AIN ceramics are compared.

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Properties of AlN-metal joints depending on the chemical composition of interlayers.

Włosiński W.K., Olesińska W.

Advances in Manufacturing Science and Technology

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2002

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Vol. 26, nr 1

17-28

EN

The results of examinations of the metallic molybdenum/manganese layers sintered on ceramic substrates in an atmosphere of dry hydrogen (dew point of 203 K) are presented. The effect of the oxygen and titanum contents in the MoMn layers produced on AlN ceramics, was examined. The layers examined were standard Mo, Mn layers in which the oxygen content was varied from 0 to 40 at.% and the titanium content from 0 to 3,8 at.%. The layers were sintered at temperatures of 1623 K and 1663 K in a hydrogen atmosphere of a dew point of 203 K (-70 degrees C). The microstructure of the metallic layers was examined using a scanning electron microscope and an electron probe. It has been found that both Al and Si migrate strongly to the interface layer. The microstructure of the metallic layers sintered on AlN differs from that of the layers sintered on alumina ceramics. In the interface layer formed between the ceramic material and the metallic layer, a continuous glass layer forms on the ceramic surface; the glass wets very well both the substrate and the metallic powders. The metallic layer is compact, and the solder does not flow in-between the grains. Based on results of the microstructural examinations, the mechanisms of the sintering of alumina and AlN ceramics are compared. The results of examination of the mechanical strength of the ceramics/ceramics and ceramics/metal (copper and FeNi42 alloy) joints performed by the three-point bending method are reported. It has been found that the mechanical strength of the joints depends on the contents of oxygen and titanium in the metallic layer. All joints brazed by "hard" solders as well as "soft" solders have a continuous microstructure and do not fail under the action of thermal stresses.

PL

Przedstawiono wyniki badań warstw metalicznych molibden/mangan spiekanych w atmosferze suchego wodoru (p. rosy 203 K). Do badań stosowano standardowe wastwy metaliczne MoMn o zawartości tlenu w zakresie 0-40% at. oraz zawartości tytanu od 0 do 3,8% at. Warstwy te spiekano w temperaturze 1623 i 1663 K w atmosferze wodoru o punkcie rosy 203 K. Stwierdzono znaczną migrację zarówno Al, jak i Si do warstwy granicznej. Mikrostruktura warstw metalicznych spiekanych na ceramice z azotku glinu różni się od mikrostruktury warstw metalicznych spiekanych na ceramice korundowej. W warstwach przejściowych utworzonych pomiędzy ceramiką a warstwami metalicznymi obserwowano na powierzchni ceramiki ciąglą warstwę szkła dobrze zwilżającą zarówno podłoże, jak i proszki metaliczne. Warstwa metaliczna jest zwarta, lut nie wnika między ziarna. Wyniki badań mikrostrukturalnych były podstawą do określenia mechanizmu spiekania warstw metalicznych dla ceramiki korundowej i ceramiki z AlN. Podano wyniki badań wytrzymałości mechanicznej złączy ceramika-ceramika i ceramika-metal (miedź i stop FeNi42) metodą zginania trójpunktowego oraz metodą ścinania. Stwierdzono, że wytrzymałość złączy zależy od zawartości tlenu i tytanu w warstwie metalicznej. Złącza lutowane zarówno lutami 'twardymi", jak i "miękkimi" zachowują ciągłość mikrostruktury, nie ulegają zniszczeniu pod wpływem naprężeń cieplnych.

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Wpływ tlenu i tytanu na mikrostrukturę warstw metalicznych Mo, Mn wytwarzanych na ceramice AIN

Olesińska W.

Kompozyty

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2001

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R. 1, nr 1

96-99

PL

Przedstawiono wyniki prac nad wytwarzaniem warstw metalicznych molibdenowo-manganowych spiekanych w atmosferze suchego wodoru (p. rosy 203 K). Badano standardowe warstwy metaliczne MoMn, do których wprowadzano tlen w ilości 0:40% atomowych oraz tytan w ilości 0:8% atomowych. Spiekanie warstw wykonano w temperaturach 1573:1673 K. Przedstawiono badania mikrostruktury warstw metalicznych spiekanych na ceramikach AIN, Si3N4 oraz Al2O3. Opisano mechanizm spiekania warstw metalicznych Mo, Mn porównawczo na ceramice korundowej i ceramice z AIN.

EN

Production of metallic layers on non-oxide ceramic materials using the powder metallization method is difficult because of the poor wettability of these materials by both molten metals and by glasses. An additional difficulty is that, at temperatures above 11423 K, ceramic materials, both alumina nitride and silicon nitride ceramics are sensitive to humidity, since in an atmosphere of water-containing hydrogen ammonia is synthesized and nitrides decompose. The present study was, therefore, devoted to the deposition of metallic layers on nitride ceramic substrates, sintered in an atmosphere of dry hydrogen. The effects of the oxygen and titanium contents in the reactive layer deposited on nitride ceramics (AIN, Si3N4) on the wettability and sintering capability of the metallic layers were examined. The deposited metallic layers were standard Mo and Mn layers with the oxygen content ranging from 0 to 40 at. % and the titanium content from 0 to 8 at. %. The layers were sintered at a temperature between 1573 and 1653 K in a hydrogen atmosphere (dew point 203 K). The microstructure of the metallic layers was examined using a scanning electron microscope (figs 1-3) and an electron probe (fig. 4). A considerable migration of Al and Si to the interface layer was observed. The microstructure of the metallic layers sintered on nitride ceramics appeared to be very similar to the microstructure of metallic layers deposited on alumina oxide ceramics (figs 5-6). In the transition layers between the Al2O3 or AIN ceramic material and the metallic layer, a continuous glass layer is formed on the ceramic surface, which wets very well both the substrate and the metallic powders. The metallic layer is compact and the braze does not penetrate between the grains.