Effects of Ni addition on the response of La2CuO4 sensing electrode for NO sensor

Introduction Interface pressure measuring devices are used to assess the pressures exerted by compression. Their performance, however, has not been considered as a contributing factor to reported inconsistences in the application of compression. A systematic review was undertaken to investigate the performance of commercially available devices used to measure interface pressure. Methods Six databases were searched identifying 17 devices, grouped into five sensor categories. Results A range of methodologies assessed the devices’ accuracy and precision, including method of pressure application, device calibration and type of surface used. No sensor category outperformed the others, however some individual sensors showed higher accuracy and/or precision compared to others. Two major factors influenced the performance of a number of sensors: the amount of applied pressure and the calibration method used. Conclusion Inconsistences in the application of compression may reflect, in part, issues related to accuracy and precision of the devices used to assess compression.

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A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

Materials ◽

10.3390/ma14082028 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2028

Author(s):

Andrey Mochugovskiy ◽

Anton Kotov ◽

Majid Esmaeili Ghayoumabadi ◽

Olga Yakovtseva ◽

Anastasia Mikhaylovskaya

Keyword(s):

Strain Rate ◽

Volume Fraction ◽

Strain Rate Range ◽

Zener Pinning ◽

Nucleation Effect ◽

Pinning Effect ◽

Ni Addition ◽

Elongation To Failure ◽

Mean Size ◽

High Temperature Tensile

The current study analyzed the effect of Ni content on the microstructure and superplastic deformation behavior of the Al-Mg-Si-Cu-based alloy doped with small additions of Sc and Zr. The superplasticity was observed in the studied alloys due to a bimodal particle size distribution. The coarse particles of eutectic origin Al3Ni and Mg2Si phases with a total volume fraction of 4.0–8.0% and a mean size of 1.4–1.6 µm provided the particles with a stimulated nucleation effect. The L12– structured nanoscale dispersoids of Sc- and Zr-bearing phase inhibited recrystallization and grain growth due to a strong Zener pinning effect. The positive effect of Ni on the superplasticity was revealed and confirmed by a high-temperature tensile test in a wide strain rate and temperature limits. In the alloy with 4 wt.% Ni, the elongation-to-failure of 350–520% was observed at 460 °C, in a strain rate range of 2 × 10−3–5 × 10−2 s−1.

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Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding

Materials ◽

10.3390/ma14164373 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4373

Author(s):

Yuqiang Feng ◽

Zexu Du ◽

Zhengfei Hu

Keyword(s):

Laser Cladding ◽

Niti Alloy ◽

Second Phase ◽

Content Increase ◽

Strengthening Effect ◽

Mixed Powder ◽

Microstructure And Properties ◽

Cladding Layer ◽

Ni Addition ◽

Aisi 316 L

This paper investigated 55 NiTi commercial alloy powder and 55 NiTi with 5% pure Ni mixed powder (55 NiTi + 5 Ni) coatings fabricated by laser cladding to study the effect of extra Ni addition on the microstructure and properties of the coating. The XRD and EDS results show that the major phases in the coatings were NiTi and Ni3Ti. Besides that, a second phase like Ni4Ti3, Fe2Ti, and NiTi2 was also detected, among which, NiTi2 was only found in 55 NiTi coating. The proportion of the phase composition in the coating was calculated via the software Image-Pro Plus. The hardness of the cladding layer reaches 770–830 HV, which was almost four times harder than the substrate, and the hardness of 55 NiTi + 5 Ni coating was around 8% higher than that of 55 NiTi coating. The wear resistance of the 55 NiTi + 5 Ni coating was also better; the wear mass loss decreased by about 13% and with a smaller friction coefficient compared with the 55 NiTi coating. These results are attributed to the solid solution strengthening effect caused by Ni addition and the second phase strengthening effect caused by the content increase of the Ni3Ti phase in the cladding layer.

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Effects of Ni Additions on the High Temperature Expansion, Melting and Oxidation Behaviors of Cobalt-Based Superalloys

Crystals ◽

10.3390/cryst11020173 ◽

2021 ◽

Vol 11 (2) ◽

pp. 173

Author(s):

Patrice Berthod ◽

Lionel Aranda ◽

Jean-Paul Gomis

Keyword(s):

Thermal Expansion ◽

High Temperature ◽

Mechanical Analysis ◽

Scanning Calorimetry ◽

Beneficial Effects ◽

Ni Addition ◽

High Temperature Expansion ◽

High Fraction ◽

Thermal Analysis Techniques ◽

Ni Additions

Nickel is often added to cobalt-based superalloys to stabilize their austenitic structure. In this work the effects of Ni on several high temperature properties of a chromium-rich cobalt-based alloy reinforced by high fraction of TaC carbides are investigated. Different thermal analysis techniques are used: differential scanning calorimetry (DSC), thermo-mechanical analysis (TMA) and thermogravimetry (TG). Results show that the progressive addition of nickel did not induce great modifications of microstructure, refractoriness or thermal expansion. However, minor beneficial effects were noted, including reduction of the melting temperature range and slight decrease in thermal expansion coefficient. The most important improvement induced by Ni addition concerns the hot oxidation behavior. In this way, introducing several tens wt % Ni in this type of cobalt-based alloy may be recommended.

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Influence of Ni on Fe and Co-Fe Based Catalysts for High-Calorific Synthetic Natural Gas

Catalysts ◽

10.3390/catal11060697 ◽

2021 ◽

Vol 11 (6) ◽

pp. 697

Author(s):

Tae-Young Kim ◽

Seongbin Jo ◽

Yeji Lee ◽

Suk-Hwan Kang ◽

Joon-Woo Kim ◽

...

Keyword(s):

Natural Gas ◽

Catalytic Performance ◽

Impregnation Method ◽

Ni Catalysts ◽

Hydrocarbon Production ◽

Synthetic Natural Gas ◽

Fe Catalyst ◽

Ni Addition ◽

Hydrocarbon Yield ◽

Fe Catalysts

Fe-Ni and Co-Fe-Ni catalysts were prepared by the wet impregnation method for the production of high-calorific synthetic natural gas. The influence of Ni addition to Fe and Co-Fe catalyst structure and catalytic performance was investigated. The results show that the increasing of Ni amount in Fe-Ni and Co-Fe-Ni catalysts increased the formation of Ni-Fe alloy. In addition, the addition of nickel to the Fe and Co-Fe catalysts could promote the dispersion of metal and decrease the reduction temperature. Consequently, the Fe-Ni and Co-Fe-Ni catalysts exhibited higher CO conversion compared to Fe and Co-Fe catalysts. A higher Ni amount in the catalysts could increase C1–C4 hydrocarbon production and reduce the byproducts (C5+ and CO2). Among the catalysts, the 5Co-15Fe-5Ni/γ-Al2O3 catalyst affords a high light hydrocarbon yield (51.7% CH4 and 21.8% C2–C4) with a low byproduct yield (14.1% C5+ and 12.1% CO2).

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