Die Löslichkeit von Quecksilber in verschiedenen Metallen

Investigations by X-ray analysis proved that V, Nb, Ta, Ti, Zr, Cr, Mo, W, Fe, Ni, Co, Re, Ru, Rh, Os, Ir, Al, Th, and U dissolve only negligible amounts of mercury. The solubility of mercury in platinum up to 250°C is small; at 250°C the solubility increases abruptly to ca. 15.5% and alters little with further temperature increases. The jump at 250°C corresponds to a peritectic reaction in the system Pt–Hg. The data obtained are in good agreement with data in the literature. Manganese dissolves at 500°C ca. 0.3–0.5% Hg; the temperature dependence of the solubility was not examined. Rhenium forms no compounds with Hg, at least at 100–500°C. The metals of the Va and VIa-group of the periodic table do not dissolve any measurable amounts of Zn.

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Hochtemperatur-röntgenographische Untersuchungen an manganreichen Mangan—Vanadin-und Mangan—Chrom—Legierungen

Zusammenfassung Die manganreiche Seite der Systeme Mn–V und Mn–Cr wurde hochtemperatur-röntgenographisch untersucht. Im System Mn–V treten bei 90 At% Mn zwei bisher nicht beobachtete Phasen, und , mit -bzw. -Manganstruktur auf. Diese gehören möglicherweise der Klasse der -bzw. -Phasen an. Die -Mischphase besitzt einen größeren Existenzbereich als in der Literatur angegeben. Die Existenz der -Phase Mn₃V, sowie die Phasenzustände bis 80 At% Mn und bei manganreicheren Legierungen unterhalb 700°C werden bestätigt. Das lineare thermische Ausdehnungsverhalten der Phasen , und sowie des -und -Mischkristalls werden angegeben. Für den manganreichen Teil wird ein vorläufiges Zustandsdiagramm entworfen. Im System Mn–Cr konnte in großen Zügen Über-einstimmung mit Literaturangaben gefunden werden. Es wird das lineare thermische Ausdehnungsverhalten der -Phase Mn₃Cr angegeben.

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High temperature X-ray investigation of Mn—rich Mn—V and Mn—Cr alloys

The manganese rich portions of the phase diagrams Mn–V and Mn–Cr have been investigated by means of a high temperature X-ray technique. In the system Mn–V two new phases, and , have been observed with -manganese and -manganese type structure, resp. These phases are probably to be classified as -and -phase. The -manganese solid solution with vanadium has a wider range of homogeneity as compared with previous work. The existence of a -phase Mn₃V and phase equilibria below 700°C reported previously could be confirmed. The linear thermal expansion of the intermetallic compounds , , , the -and -manganese solid solutions with vanadium has been evaluated. A tentative phase diagram for the manganese rich portion is given. The main features of the system Mn–Cr according to previous investigations could be confirmed. The linear thermal expansion of the -phase Mn₃Cr is reported.

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Mit 8 Abbildungen

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Herrn Prof. Dr.Hans Nowotny in Dankbarkeit gewidmet.     

Aufbau und Schmelzverhalten von Nickel-Kupfer-Bor und Nickel-Kupfer-Silicium Legierungen

Within the group of boride and suicide containing hard alloys, those based on copper have recently found increasing interest as wear-resisting stratification and high-temperature structural materials. For the development of the best alloy, the phase conditions in the systems nickel-copper-boron and nickel-copper-silicon were elucidated from the isothermal profiles at 700°. Melting behaviours (important from a practical point of view) in the area of low metalloid contents are presented in the cases of (Ni-Cu-B) mixed crystals, Ni₃B alloy, as well as Ni-Cu-10 atomic % B and Ni-Cu-10 atomic % Si.     

Das Dreistoffsystem Nickel-Bor-Silicium

The ternary system Nickel-Boron-Silicon was established at 850°C by means of X-ray diffraction, metallographic and micro-hardness examinations. The well known binary nickel borides and silicides resp. were confirmed. In the boron-silicon system two binary phases, SiB_4-x withx≈0.7 and SiB₆ were found the latter in equilibrium with the β-rhombohedral boron. Confirming the two ternary silicon borides a greater homogeneity range was found for Ni₆Si₂B, the phase Ni_4,6Si₂B published byUraz andRundqvist can better be described by the formula Ni_4.29Si₂B_1.43. In relation to further investigations we measured melting temperatures in ternary Ni-10 B?Si alloys by differential thermoanalysis.     

Das Dreistoffsystem Nickel—Chrom—Bor

The ternary system Ni?Cr?B was established at 1000°C by X-ray diffraction and metallographic examinations. Binary chromium resp. nickel borides and two ternary borides Cr₃NiB₆ and Cr₂Ni₃B₆ were confirmed. Differential thermoanalysis of binary Ni?B-alloys showed the possibility of a metastable solidification according the partial system Ni?Ni₂B up to 19 at % B. The melting temperatures of ternary alloys were established.     

Das Dreistoffsystem Nickel-Kupfer-Bor

The ternary system nickel-copper-boron was established at 700°C by means of X-ray diffraction and metallographic examinations. Confirming the well known binary nickel borides no ternary boride was found.The solubility of boron in the nickel-copper solid solution is very small and has its maximum of about 0.3 at% in the binary system copper-boron.Differential-thermoanalysis shows a quasibinary eutectic between Ni₃B and copper solid solution.

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Mit 5 Abbildungen     

Plasma spraying-an innovative coating technique: process variantsand applications

The use of plasma processing for spraying is reviewed, with emphasis on the material used, their sprayed structure, and successfully applied coatings. It is noted that new and further developments in plasma spray processes, spray devices, and spray materials have led to advantages in the realization of functional coatings and applications ranging from conventional to highly specialized industries. Different functions of the sprayed coatings can be achieved by choosing various plasma-process variations and any of a high number of useful coating materials. The plasma-spray process can be regarded as almost universal because of its inherently high process temperature, which allows almost unlimited combinations of coating and base material to be used     

Coating technology

Summary Many important functional coatings are realized by advanced coating technology in almost any kind of industry. To meet that goal, innumerable coating techniques and coating materials have been developed and are in use. By varying coating and substrate material, an almost unlimited potential exists in the case of plasma spraying and its process variants, which has to be regarded as the most important coating technique. To meet increasing requirements in coating performance, there has also been an increase in the importance of analytical techniques in coating production. The dominant areas of analytical methods which arise in the case of plasma spraying are characterization of coating materials, spray process control and coating characterization as well as cases of coating failures. To meet these requirements in analyzing, many analytical techniques are available and their use is a must in coating technology.

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Technische BeschichtungenZielsetzung, Möglichkeiten und Beitrag der Analytik zur Plasma-Sprühtechnik