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1

Textured nickel tapes prepared from commercially available material

100%

Staller O., Holzmann D., Gritzner G., Diko P., Mikolaj D., Kováč F.

Open Chemistry

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2008

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vol. 6

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issue 2

135-139

EN

Textured Ni tapes were fabricated from commercially available nickel pellets (98.5% Ni). Ingots produced by a melt process were cold rolled to 150–400 μm thick tapes. Texturing was achieved by annealing in a reducing atmosphere (Ar + 6.5% v/v H2). Sharp cubic biaxial textured Ni tapes were obtained by thermal treatment at 1000°C for 2 hours in a reducing atmosphere. The tapes were characterized by scanning electron microscopy, X-ray diffraction and by electron backscattering diffraction. The tensile strength, the thermal expansion behavior and the Vickers hardness for the cold rolled tapes and for the heat-treated tapes were measured. [...]

2

Fabrication of biaxial textured NiO on Ni in a one-step process

100%

Staller O., Gritzner G.

Open Chemistry

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2008

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vol. 6

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issue 2

293-296

EN

A novel method for the preparation of biaxial textured nickel oxide on commercially available nickel via a modified surface oxidation epitaxy (SOE) process has been developed. Following studies of different heat-treatment procedures for both texturing of nickel and for the fabrication of nickel oxide the following method was found to yield the best results. Nickel was first textured under an argon - hydrogen atmosphere at 1000°C for 120 min, then the temperature was lowered to 800°C and the atmosphere was changed to argon with 3 ppm oxygen. Smooth and crack free c-axis textured and a–b aligned NiO buffer layers with an out-of-plane texture of 7.8° and an in-plane texture of 9.4° were successfully produced. Higher oxygen partial pressure and temperatures resulted in increased surface roughness and excessive grain growth. [...]

3

Tensile strengths and Young’s modulus of thin copper and copper-nickel (CuNi44) substrates

88%

Staller O., Mitterbauer C., Mayr K.

Open Chemistry

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2008

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vol. 6

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issue 4

535-541

EN

In this paper we report a method to determine tensile strengths and Young’s modulus of cubic biaxial textured metal tapes used as substrate materials for coated conductors (CC). Simplicity, rapidity and reproducibility of the procedure are important for the evaluation of continuous in-house productions. Our approach is based on the EN 10002-1 B tensile test method. A key role for satisfactory results is the sample preparation of 100–250 μm thick tapes, which will be described in detail. Copper (E-Cu57) can be successfully transformed to cubic biaxial textured substrates. Best results were achieved by annealing between 750°C and 850°C in reducing atmosphere. Best FWHM values for the ψ scan are 5.51° and for the ϕ scan are 4.5°. Pole figure analysis verified the sharp {001} texture of the tape. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 135 and for the annealed tape, values of 37. The ultimate tensile yield strength Rm of the textured substrate is 150 MPa and thus significantly lower than that for the cold worked material (413 MPa). Cubic biaxial substrates could be manufactured from Isotan CuNi44 (WM49) bars. Best results were achieved by annealing at 1200°C in reducing atmosphere. Pole figure analysis verified the {001} texture with other low intensity texture components. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 236 and for the annealed tape values of 92. The ultimate tensile yield strength R m of the textured substrate is 300 MPa and thus significantly lower than that for the cold worked material (723 MPa). [...]

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3 Open Chemistry

3 2008

3 Staller O.

2 Gritzner G.

1 Diko P.

1 Holzmann D.

1 Kováč F.

1 Mayr K.

1 Mikolaj D.

1 Mitterbauer C.

Textured nickel tapes prepared from commercially available material

Fabrication of biaxial textured NiO on Ni in a one-step process

Tensile strengths and Young’s modulus of thin copper and copper-nickel (CuNi44) substrates