English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The surface tension and the viscosity of the catalytic precursor alloys Ni-68.5 at.% Al, Ni-75 at.% Al and Ni-75 at.% Al-1.5 at.%. Cr were measured over a temperature range of about 400 K using the oscillating drop technique in an electromagnetic levitation device under reduced gravity conditions. The experiments were performed on board parabolic flights and on a TEXUS sounding rocket flight. At the liquidus temperatures of 1 604 K and 1398 K the viscosities of Ni-68.5 at.% Al and Ni-75 at.% Al were obtained as ν(T liq ) = 4.31 mPa · s and ν(T liq ) = 4.53 mPa · s, respectively. In the investigated temperature range the viscosity exhibited a linear temperature dependence. The surface tension as a function of temperature can be represented as ω(T) = 1.01 N m −1  – 2.8 · 10 −4  (T – 1 603 K) N m −1  and ω(T) = 0.92 N m −1  – 1.40 · 10 −4  (T – 1 398 K) N m −1  for Ni-68.5 at.% Al and Ni-75 at.% Al, respectively. Comparison of the experimental viscosities with predictions from different semi-empirical models showed that the latter underestimate the experimental values by between 25 and 40%.

Surface tension and viscosity of NiAl catalytic precursor alloys from microgravity experiments