Crystal structure, electrical resistivity and Curie temperature of and intermetallics

Bednarski, M; Chmist, J.; Pszczoła, J.

doi:10.1016/j.jmmm.2013.01.018

Cited by 5 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Terminals for the vacuum pump (10), for the pressure meter (20, terminal not visible), for the inert gas inlet (21, 22) and for the safety valve (25) are present on the melting chamber sides. The melting chamber (6) is covered with the chamber lid (11).…”

Section: The Melting Chambermentioning

confidence: 99%

“…Use of the electrically isolating teflon for these elements enables the non-contact melting in the arc furnace. These teflon elements (13,14) with well-chosen dimensions, as well as the teflon bellows (15), exclude a parasitical arc between the electrode tube (12) and the chamber lid (11). Here it can be added that as a rule in the contact ignition arc systems stainless steel bellows and phosphor bronze balls are used [1,2].…”

Section: The Melting Chambermentioning

confidence: 99%

“…4. A cross section of the part essential for the non-contact ignition composed of the bellows made of teflon (15), the electrode tube made of stainless steel/copper (12), the guide ball made of teflon (14), the sliding rings made of teflon (13), the holding ring made of stainless steel (24), the lid made of stainless steel (11), and the divided ring (19) The teflon bellows (15), the ball guide (14), and the sliding rings (13) electrically isolate the negative electrode tube (12) as well as the tungsten end electrode (7) from the chamber lid and thus from the rest of the furnace, including the positive electrode (4).…”

Section: The Melting Chambermentioning

confidence: 99%

“…The high temperature synthesis procedure using the arc melting system with non-contact ignition is a simple and convenient method. After introducing the components to be melted into the hollow of the cold crucible (4), the melting chamber (6) is covered with the chamber lid (11). The distance between the tungsten end electrode (7) and the charge in the crucible (4) is then approximately equal to 10-15mm.…”

Section: The Basic Synthesis Proceduresmentioning

confidence: 99%

“…As a next step, the distance muff with a semicircle C-letter type cross section made of polyamide is interposed between the chamber lid (11) and the flange of the electrode tube (12) (Figs 2, 3). The distance muff precludes an excessive compression of the bellows (15), and thus precludes a shift of the end tungsten electrode (7) into the charge during the pumping procedure.…”

Section: The Basic Synthesis Proceduresmentioning

confidence: 99%

See 4 more Smart Citations

An arc melting system with a non-contact ignition

Onak¹,

Pszczoła²

2018

Physics for Economy

View full text Add to dashboard Cite

Arc melting is a widely used method in materials physics, in general in materials science, as well as in metallurgy, to synthesize new materials starting from high purity constituents. As the high temperature of the technological process is easily attainable, typically arc melting is used to synthesize new materials from metals, and even oxides, with high melting points. In the melting methods usually used the arc is ignited by briefly touching the electrode to the crucible and quickly withdrawing it to a short distance. The contact ignition, however, can contaminate the tip of the tungsten electrode and consequently can reduce the purity of the obtained ingot as compared to the initial components. In order to avoid the contact procedure and thus the purity reduction, an arc non-contact ignition system for melting is proposed in this paper. The arc melting system, the furnace design, the ready for use arc furnace, and the melting procedure, are presented and discussed. Additionally, an arc furnace with a suction attachment to prepare ingots as rods is presented. The clean crystal structures, known from literature, were determined for a number of the compounds synthesized by the non-contact arc method. This quality of crystal structures results mainly from the maintained materials purity during synthesis.

show abstract

Section: The Melting Chambermentioning

confidence: 99%