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Coatings, Volume 2, Issue 2 (June 2012), Pages 64-94

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Open AccessArticle Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics
Coatings 2012, 2(2), 64-75; doi:10.3390/coatings2020064
Received: 9 January 2012 / Revised: 8 March 2012 / Accepted: 12 March 2012 / Published: 28 March 2012
Cited by 4 | PDF Full-text (2095 KB) | HTML Full-text | XML Full-text | Correction | Supplementary Files
Abstract
Lead zirconate titanate (PZT) was plasma sprayed onto various substrates of different character. Additionally, a free-standing body made by plasma spraying was investigated. X-ray diffraction analyses of a decomposition of the as-sprayed coating products detected components of the PT-PZ system as well [...] Read more.
Lead zirconate titanate (PZT) was plasma sprayed onto various substrates of different character. Additionally, a free-standing body made by plasma spraying was investigated. X-ray diffraction analyses of a decomposition of the as-sprayed coating products detected components of the PT-PZ system as well as binary oxides—PbO and ZrO2. Due to the comparatively complex phase character, the Curie temperature monitored by DTA, had a smeared appearance without pronounced maxima. The corresponding electrical properties are comparable with those typically observed for CaTiO3, but are worse than the normal values of bulk PZT due to defective stoichiometry. Full article
(This article belongs to the Special Issue Advanced Thermal Spray Coatings for Emerging Applications)
Open AccessArticle Spreading Behavior and Morphology of Ethylene Methacrylic Acid (EMAA) Deposits via the Flame Spray Process
Coatings 2012, 2(2), 76-93; doi:10.3390/coatings2020076
Received: 24 January 2012 / Revised: 6 April 2012 / Accepted: 22 May 2012 / Published: 15 June 2012
Cited by 3 | PDF Full-text (3084 KB) | HTML Full-text | XML Full-text
Abstract
A single splat is the building block of a thermal spray coating; thus, investigating single splats is essential to understanding thermal spray coatings and their properties. In this study, the spreading behavior and the morphology of flame sprayed ethylene methacrylic acid (EMAA) [...] Read more.
A single splat is the building block of a thermal spray coating; thus, investigating single splats is essential to understanding thermal spray coatings and their properties. In this study, the spreading behavior and the morphology of flame sprayed ethylene methacrylic acid (EMAA) splats, deposited at various stand-off distances (SODs) onto glass and mild steel substrates were investigated using optical microscopy, back scattered scanning electron microscopy and secondary electron scanning electron microscopy. The results of this study indicate that the spread factor increases with an increase in the stand-off distance up to 30 cm for glass and 25 cm for steel substrates. Further increase of the stand-off distance results in a decreased spread factor. The aspect ratio of EMAA single splats on both glass and mild steel substrates decreases with increased stand-off distances, indicating that more circular shapes occur at higher stand-off distances. On mild steel substrates, the minimum unevenness ratio (η) occurs at 35 cm SOD. The unevenness ratio (η) on glass substrates decreases from 1.9 (at 20 cm SOD) to 1.77 (at 25 cm SOD), and from 1.8 (at 30 cm SOD) to 1.3 (at 35 cm SOD). The lowest unevenness ratio (η) is found at 35 cm SOD. The highest unevenness ratio (η) is at 25 cm SOD. This paper discusses the effect of surface chemistry on the underside of an EMAA single splat morphology. It includes Raman spectrum analysis of EMAA and the X-ray diffraction of the EMAA powder. This work analyses the splat morphology and classifies the taxonomy of single splats of EMAA. Full article

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Open AccessCorrection Correction: Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics. Coatings 2012, 2, 64-75
Coatings 2012, 2(2), 94; doi:10.3390/coatings2020094
Received: 12 June 2012 / Accepted: 12 June 2012 / Published: 19 June 2012
PDF Full-text (110 KB) | HTML Full-text | XML Full-text
Abstract The authors wish to make the following correction to this paper: the correct number of the project granted by the Czech Science Foundation is P108/12/1872. [...] Full article
(This article belongs to the Special Issue Advanced Thermal Spray Coatings for Emerging Applications)

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