Plasma spraying of nanostructured partially yttria stabilized zirconia powders

Li, J.F; Liao, Hanlin; Wang, X.Y; Coddet, Christian; Chen, H; Ding, Chuanxian

doi:10.1016/j.tsf.2004.01.078

Cited by 26 publications

(22 citation statements)

References 29 publications

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“…[20] In the present study, the average grain size and the lattice strain of the nonwovens were estimated based on XRD peak broadening according to the well-established Scherrer method: [21] …”

Section: Characterization Of Fibre Morphology and Structurementioning

confidence: 99%

Morphology and Structure of Constituent Fibres in Thermally Bonded Nonwovens

Wang¹,

Gong²

2006

Macro Materials & Eng

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Summary: A new process has been developed to produce three‐dimensional nonwovens directly from staple fibres. In order to establish suitable windows of the process parameters to achieve high‐quality nonwoven products, the effects of thermal bonding temperature, dwell time and mould material on the morphology and structure of the fibre have been investigated using PP/PET bi‐component fibres. It was evident from both scanning electron microscope images and Raman spectra that thermal‐induced shrinkage of the PP sheath fibre occurred in the thermal bonding process, leading to deformation and cracking of the PP sheath and exposure of the PET core. X‐ray diffraction results revealed crystal imperfection and/or less ordered polymer chains, more γ‐form and thermal contraction of the crystal lattice for the PP sheath fibre, while birefringence measurements indicated that both the birefringence and the orientation factor for the PP fibre decreased after the thermal bonding process. The degrees of the thermal‐induced shrinkage increased, and the crystallinity, birefringence and orientation factor of the PP sheath fibre decreased with increasing thermal bonding temperature, dwell time and thermal conductivity of the mould material. All these can be attributed to the different levels of modification of chemical composition caused by thermal oxidative degradation and thermal‐induced relaxation of the orientation during the thermal bonding process.Changes of morphology and crystalline features of PP/PET fibre after thermal bonding process.imageChanges of morphology and crystalline features of PP/PET fibre after thermal bonding process.

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Section: Characterization Of Fibre Morphology and Structurementioning

confidence: 99%

Morphology and Structure of Constituent Fibres in Thermally Bonded Nonwovens

Wang¹,

Gong²

2006

Macro Materials & Eng

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“…Therefore, this typical structure should exist in the coatings formed by RPS universally, which is also reported in ZrO 2 coatings by plasma-sprayed nanostructured, partially yttria-stabilized zirconia powders. 16 The short dwell time the powder experiences during plasma spraying and the high quenching rate of about 10 6 K/s help to form the nanoscale grains and multiple structures of the coatings. In addition, the temperature of the plasma jet is quite different at different positions, with the temperature decreasing rapidly from the center to the outside.…”

Section: Discussionmentioning

confidence: 99%

Grain characterization of nanostructured TiN coatings prepared by reactive plasma spraying

Zou

Ding

Xiao

et al. 2007

Surface & Interface Analysis

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Nanostructured TiN coatings were prepared by reactive plasma spraying, and the microstructure and the grain morphology of the coatings were analyzed by XRD, SEM and TEM. The results show that the coatings were mainly composed of TiN and Ti 3 O phases (other phases were not detected), and they had the typical sprayed lamellar structures with few pores being visible. In the planar view, nanoscale grains with particle diameters ranging from 60 to 120 nm were observed in the coatings, and both fine equiaxial and columnar grains were found in some zones of the coatings. But in the cross-sectional view, the TiN coatings were mainly composed of columnar grains, with no qualities of equiaxial grains being found. Thus, it can be concluded that the TiN coatings are composed of columnar grains, and the columnar grains are nanostructural, equiaxial grains in their cross-section.

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“…The spheroidal shape of the feedstock powders will also provide for a higher packing density during the deposition process [13]. It has also been shown that spray dried powders have higher depo- sition efficiencies with a higher level of predictability based on plasma spraying parameters as opposed to ground or ball-milled micron-sized powders [24].…”

Section: Powder Characteristicsmentioning

confidence: 99%

“…Otherwise, the smaller particles do not reach the critical mass needed to enter the hot zone of the plasma flame, resulting in poor coating efficiency (and bond strength) [26]. The resulting density of the part is directly related to the density and size distribution of the inbound agglomerate and the plasma spraying parameters for spraying and deposition [24]. The presence of HfC particles in the path of dislocation motion provides obstacles to its motion and increases the amount of energy (stress) needed to pull a line of solute atoms from the dislocation line [25].…”

Section: Microstructure and Strengthening Mechanismsmentioning

confidence: 99%

Structure and property evaluation of a vacuum plasma sprayed nanostructured tungsten–hafnium carbide bulk composite

Rea

Viswanathan

Kruize

et al. 2008

Materials Science and Engineering: A

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractVacuum plasma spray (VPS) forming of tungsten-based metal matrix nanocomposites (MMCs) has shown to be a cost effective and time saving method for the formation of bulk monolithic nanostructured thermo-mechanical components. Spray drying of powder feedstock appears to have a significant effect on the improved mechanical properties of the bulk nanocomposite. The reported elastic modulus of the nanocomposite nearly doubles due to the presence of HfC nano particulates in the W matrix. High resolution transmission electron microscopy (HRTEM) revealed the retention of nanostructures at the select process conditions and is correlated with the enhanced mechanical properties of the nanocomposite. Published by Elsevier B.V.

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Plasma spraying of nanostructured partially yttria stabilized zirconia powders

Cited by 26 publications

References 29 publications

Morphology and Structure of Constituent Fibres in Thermally Bonded Nonwovens

Morphology and Structure of Constituent Fibres in Thermally Bonded Nonwovens

Grain characterization of nanostructured TiN coatings prepared by reactive plasma spraying

Structure and property evaluation of a vacuum plasma sprayed nanostructured tungsten–hafnium carbide bulk composite

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