Thermal stability up to 800 °C of a Ni–4 wt% Al nanocomposite

Zheng, Lirong; Xiao, Peng; Wang, F.

doi:10.1007/s10853-012-6501-4

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…Untill now, only several papers reported the water-resistant properties of KNN-based ceramics, which is also an important property for application. Zheng [8]and Y Oba [9]enhanced the moisture-resistance of KNN-based ceramics through compositing the second phase, such as ScTaO 4 , or ZnO-based glass. But, the more important point is to find out how the environmental humidity influences the electrical properties of KNN-based ceramics and how to enhance its humidity stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Humidity Stability of (Li,K,Na)NbO3-Based Lead-Free Piezoelectric Ceramics by Adding B2O3

Zhen

Dai

Jia

et al. 2013

MSF

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5wt%B2O3-doped (Li,K,Na)NbO3 (abbreviated as LKNN-B5)-based lead-free piezoelectric ceramics were prepared via solid state synthesis. The electrical humidity sensitive properties of LKNN-B5 ceramics were examined and compared with pure LKNN ceramics. The results revealed thatB2O3 doping enhanced electrical stability of LKNN-based ceramics in relative humidity (RH) range of 33-95%. The capacitance change was suppressed from 105% down to 43% when doped with B2O3. The average absorption time was reduced from 5.5 min to 1.5 min, and desorption time decreased from 8.5 min to 2.0 min. The enhanced electrical stability of LKNN-B5 series was attributed to the dense structure induced by liquid phase sintering.

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Section: Introductionmentioning

confidence: 99%

Enhanced Humidity Stability of (Li,K,Na)NbO3-Based Lead-Free Piezoelectric Ceramics by Adding B2O3

Zhen

Dai

Jia

et al. 2013

MSF

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“…at 600°C ( The cross-section micrographs of the Ni/nAl deposits after metallographic etching show that all deposits preserve a predominant columnar structure after each heat treatment temperature (Figure 5). The small dimensions of the particles and their more uniform distribution in the matrix in comparison to the Ni/μAl could lead to an advance of the interdiffusion at lower heat treatment temperature [17]. The diffusion of Al blocks the recrystallisation of the Ni grains and 'freezes' the already refined columnar structure.…”

Section: Microstructurementioning

confidence: 99%

“…Electrolytic co-deposition [4] has received extensive attention in the last decades as a very low-cost technology that allows to produce metal matrix (Ni, Co or their combination) and metal particles (Al,Ti,Cr) composite coating [5-31] which can exhibit high oxidation resistance due to the ability to form continuous and protective layers of Al 2 O 3 , TiO 2 and/or Cr 2 O 3 . The system Ni matrix/Al particles are the first and the most studied from the scientific community [8-31].…”

Section: Introductionmentioning

confidence: 99%

Heat treatments hardening effect on Ni–Al composite electrodeposits

Offoiach

Lekka

Johanns

et al. 2019

Surface Engineering

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Pure Ni galvanic coatings show good mechanical properties at room temperature but exhibit a progressive decrease by increasing the temperature due to the recrystallisation. A possible solution to hinder the recrystallisation is the co-electrodeposition of metal particles which could lead to the formation at high temperature of Ni alloy coatings with higher mechanical properties. Ni matrix composite deposits containing either micro (4 μm) or nano (130 nm) particles of Al were produced in a parallel plate geometry. The deposits were characterised regarding their microstructure both prior and after heat treatments for 3 h at 400, 600 and 800°C in order to evaluate the formation of Ni/Al phases. This work focused on the evaluation of the hardness on coatings cross-section by means of Vickers microhardness and Berkovich nano-indentation mapping. The results obtained with the two methods have been compared and correlated to the microstructural modifications in order to understand the hardening mechanisms.

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Achieving Exceptional Tensile Properties and Improved Microstructural Stability in Nanocrystalline Ni Via Amorphous Interfacial Phase by Codepositing Al Nanoparticles

Chhangani

Prasad

2018

Adv Eng Mater

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A thin amorphous interfacial phase within microstructure is one of the promising strategies for designing better nanostructured materials. Nickel and Ni–Al nanocomposites fabricated by pulsed electrodeposition are deformed in tension and selected samples are heated to elevated temperatures. Here, the authors report that a well‐dispersed Al nanoparticle, possessing a thin layer of amorphous oxide shell, reinforcement in nanocrystalline Ni matrix enhances tensile strength by ≈60% without losing ductility and also provides better microstructural stability due to existence of local microstructural gradient.

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Thermal stability up to 800 °C of a Ni–4 wt% Al nanocomposite

Cited by 12 publications

References 20 publications

Enhanced Humidity Stability of (Li,K,Na)NbO<sub>3</sub>-Based Lead-Free Piezoelectric Ceramics by Adding B<sub>2</sub>O<sub>3</sub>

Enhanced Humidity Stability of (Li,K,Na)NbO<sub>3</sub>-Based Lead-Free Piezoelectric Ceramics by Adding B<sub>2</sub>O<sub>3</sub>

Heat treatments hardening effect on Ni–Al composite electrodeposits

Achieving Exceptional Tensile Properties and Improved Microstructural Stability in Nanocrystalline Ni Via Amorphous Interfacial Phase by Codepositing Al Nanoparticles

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