Thierry Poirier

Thierry Poirier
Institut de Céramique Française, Limoges, France

PhD

About

48
Publications
10,074
Reads
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312
Citations
Additional affiliations
November 2014 - December 2014
University of Limoges
Position
  • invited professor
Description
  • classes in Master 2 IMHP, cotutoring PhD Thesis, spray pyrolysis
November 2014 - December 2014
University of Limoges
Position
  • Professor (Full)
Description
  • MSc classes (IMHP-PCA), Research on spray pyrolysis
November 2013 - December 2013
University of Limoges
Position
  • invited researcher
Description
  • spray pyrolysis
Education
October 1995 - November 2000
University of Limoges
Field of study
  • Ceramic Materials and Surface Treatments
September 1992 - November 1993
ENSCI Limoges, France
Field of study
  • Ceramic Engineering
September 1990 - June 1993
ENSCI Limoges
Field of study
  • Ceramic Engineering

Publications

Publications (48)
Article
Full-text available
Hydraulic components are coated by thermal spraying to protect them against cavitation erosion. These coatings are built up by successive deposition of single splats. The behavior of a single splat under mechanical loading is still very vaguely understood. Yttria-stabilized zirconia (YSZ) and stainless-steel splats were obtained by plasma spraying...
Article
Two kinds of cauliflower-like architecture yttria stabilized zirconia (YSZ) coatings with different amounts inter-columnar voids were prepared by suspension plasma spraying (SPS) under different spraying parameters. YSZ coatings with high and moderate porosity were infiltrated with polytetrafluoroethylene (PTFE) in order to form a novel structured...
Article
Full-text available
RESUMEN En esta contribución se presentan los resultados obtenidos de la evaluación de las aguas residuales provenientes de los tanques sedimentación de dos empresas premezcladoras de concreto. Se evidencia que los parámetros comunes se encuentra dentro de los límites permisibles establecidos en la normativa COVENIN 2385, ASTM C94 y EN 1008 de cali...
Article
Cavitation erosion resistance of 8 wt.% yttria stabilized zirconia has been investigated in specimens prepared by atmospheric plasma spraying and laser remelting post treatment. The results indicate that as-sprayed coatings involve defects such as primary cavities and initial micro cracks inside a particle and among the interfaces of particles. Whe...
Article
Cavitation erosion of plasma sprayed yttria stabilized zirconia coatings produced by feedstocks with different initial sizes was investigated according to the main guidance of ASTM-G32. Prior to thermal spray, substrates were preheated to 150 and 300 °C. The size distribution of pores on the surface of coatings (as-sprayed and eroded) was estimated...
Article
Coating deposition of high wear resistant materials is an effective alternative for protection of commercial substrates against cavitation erosion. In present investigation, different amounts of NiCrBSi powders (5 wt%, 15 wt% et 25 wt%) were added into yttria stabilized zirconia (YSZ) powders in order to produce denser YSZ-NiCrBSi composite coating...
Article
In this study, 8 wt.% yttria-stabilized zirconia powder was deposited on the substrates by atmospheric plasma spray. The coatings were post-treated by laser glazing under different parameters in order to densify them. The characterization of the laser molten pools under different laser treatment conditions was studied. Preheating processes were als...
Article
Laser glazing is considered to be a promising surface sealing technique for thermal barrier coating. The dense top layer with reduced surface roughness and the segment cracks perpendicular to the surface are considered to be suitable for improving the thermal cycling and hot corrosion resistance of these kind of coatings. In present study, yttria s...
Article
CoMoCrSi coatings were manufactured on a steel substrate by atmospheric plasma spraying (APS), followed by a three-hour heat treatment at a temperature of 800 °C and 1000 °C, respectively. Prior to the ultrasonic test of the cavitation erosion, coating cross-sections were observed by scanning electron microscopy (SEM) and analyzed by X-ray diffract...
Research
Full-text available
TED-Talk type conference for Venezuelan researchers (in Spanish, may 2015) “Is it possible to survive to the Venezuelan crisis and, by the way, improve as a professor?” (“¿es posible sobrevivir a la crisis en Venezuela y volverse mejor profesor en el intento?”)
Research
Full-text available
Conferencia divulgativa sobre arenas movedizas. casos típicos, reología y evolución del material granular. Fluidos con umbral, número de Deborah, número de Leighton, estudios de casos y relación entre material y reología : Mont Saint-Michel, Carretera Qom-Teheran (Bonn & al), Lencois Maranhenses (Kadau & al), Maizina (Huang)
Research
Full-text available
El presente documento tiene por objeto: a) Estudiar aspectos endógenos de los retos y dificultades que enfrentan las alfarerías industriales venezolanas. b) Identificar sus fortalezas y relacionarlas con su desempeño en términos de estadística de calidad de fabricación. c) Dar una aproximación estadística de algunos datos de proceso, como la can...
Article
Slags may be flame sprayed to produce hollow vitreous or semi-crystalline microspheres. Feedstock compositions, as well as the heating and cooling kinetics, determine the properties of the final product. These kinetics were estimated by finite element modeling of the thermal and kinematical history of different slags throughout a flame and compared...
Article
Full-text available
Frente a los problemas de calidad experimentados en producción por muchas empresas cerámicas venezolanas, una de las respuestas consiste en realizar, en los diversos sectores de las minas proveedoras, un análisis no solamente de la composición química o de la granulometría de la materia prima, sino también de las propiedades más relevantes involucr...
Article
In order to respond to quality issues experimented in Venezuelan ceramic companies, the chemical and granulometric analysis of raw material should be combined with the measurement of its most relevant processing properties. By identifying "clusters" inside the mine with similar properties and finding reliable correlations between composition and th...
Conference Paper
Full-text available
Semicrystalline microspheres are generally easily obtained from petrurgical processes, ie crystallization from a melted composition when cooling velocity and oxide compositions are unable to yield total vitrification. However, when glass ceramics are obtained by annealing a easily vitrified glass composition, the rounding of crushed microparticles...
Article
Glasses in the Fe2O3–SiO2–CaO system are potential candidates for many technological applications due to their ferrimagnetic and semiconductive properties, which have been extensively studied; in this sense, the effect of adding different melting additives like Li2O, B2O3, in this glass system on frits and glazes with 30–40 mass-% of Fe2O3 was stud...
Article
The cavitation-erosion resistance of tetragonal zirconia polycrystals with 3% mol. Y2O3 (3Y-TZPs) has been studied in specimens sintered in the temperature range from 1500 to 1590 ºC. The study shows loss mass measurements after ultrasonic cavitation in conjunction with X-ray diffraction oriented to identify the ratio between tetragonal and monocli...
Article
Full-text available
Coloured coatings were obtained on steel by plasma spraying without severe in-flight alteration of pigments, taking profit of the low thermal conductivity of the glassy matrix of glaze particles. Colour matching was studied by mixing 3 different glazes, comparing Grassmann and Kubelka-Munk based algorithms. Results suggest that the latter method sh...
Article
Full-text available
In this study, different frit compositions were prepared in the SiO2–CaO–Fe2O3 system. The amounts of Fe2O3 were varied between 10 mass-% and 40 mass-%. The frits were melted and characterized using several different techniques in order to study the crystalline composition of the frits and glazes and assess their suitability for tile production pro...
Article
In this study, different frit compositions were prepared in the SiO 2-CaO-Fe 2O 3 system. The amounts of Fe 2O 3 were varied between 10 mass-% and 40 mass-%. The frits were melted and characterized using several different techniques in order to study the crystalline composition of the frits and glazes and assess their suitability for tile productio...
Article
Full-text available
The spreading phenomena of particles during thermal spraying are quite difficult to observe given the kinetics of the process. In this work, the splat formation of glass and alumina is theoretically compared, showing that glass transition and low-thermal conductivity yield a higher ratio between cooling and flattening times, which strongly modifies...
Article
The preparation of polypropylene (PP) nanocomposites was studied using clay and three types of modified PP (m-PP) as compatibilizers: diethyl maleate grafted PP (PP-g-DEM), maleic anhydride grafted PP (PP-g-MA), and PP grafted with carbamyl maleamic acid (PP-g-UMA). The clay was made organophylic by an acid treatment with octadecylamine. PP functio...
Conference Paper
Full-text available
So-called 'wall sticking' consists of the accumulation of suspension drops, general partly dried in flight, on the inner walls of the spray dryer. On an industrial level, this effect usually alters the size distribution of the granules made, and causes accidents and production shutdowns due to the collapse of slabs of agglomerate powder. Wall stick...
Conference Paper
Full-text available
El efecto llamado “sucio de pared” consiste en la acumulación de gotas de suspensión, en general parcialmente secadas en vuelo, sobre las paredes internas del atomizador. A nivel industrial, este efecto suele alterar la distribución de tamaño de los gránulos fabricados, y causar accidentes y paradas de producción debidas a los derrumbes de placas d...
Article
Full-text available
In this article a new design for a thermal plasma reactor with expansion chamber for aluminum nitride (AlN) synthesis is proposed. The new reactor was constructed of stainless steel (AISI 304), and this was proved with a high temperature direct nitriding process of aluminum chloride and with a thermal carbonitriding process of gibbsite. The product...
Article
In this article a new design for a thermal plasma reactor with expansion chamber for aluminum nitride (AlN) synthesis is proposed. The new reactor was constructed of stainless steel (AISI304), and this was proved with a high temperature direct nitriding process of aluminum chloride and with a thermal carbonitriding process of gibbsite. The product...
Article
Full-text available
Milled particles from a (SiO2-CaO-Fe2O3) glass were smoothed by flame spraying, focusing on the elimination of superficial roughness or angularity without reaching complete fusion of the glass. The purpose of this study is the further application to glass ceramic microspheres where avoiding thermal resetting of the second phase is needed. Finite el...
Article
Full-text available
En el presente trabajo se estudia la viabilidad de aplicar leyes lineales de mezcla en composiciones arcillosas que incluyan ilitas, pirofilita, caolinita y desgrasantes, con respecto a diversas propiedades como la plasticidad, el comportamiento al secado (curva de contracción vs humedad) y el color de la mezcla cruda. El interés de dicho estudio r...
Article
Glass ceramics were obtained by annealing of the SiO2–CaO–Fe2O3 system, and the devitrifying effect of adding TiO2 was compared with Fe2O3. In spite of its higher field strength, TiO2 was unable to accelerate the devitrifying kinetics as could be seen in the TTT diagrams between 825 and 1000 °C. In both kinds of composition, a strong increase in el...
Article
Nanocomposites of montmorillonite (MMt) and ternary blends of Polyamide 6/Metallocene Polyethylene/SEBS grafted with diethyl maleate (PA6/mcPE/SEBS-g-DEM) and maleic anhydride (PA6/mcPE/SEBS-g-MA) were prepared in an internal mixer (Rheomix) in order to improve the toughness of the nanocomposite counterpart prepared with PA6 and MMt. The PA6/MMt na...
Article
Alumina grains present a higher cost and much shorter life than metallic grains when grit blasting steel substrates before industrial HVOF deposition. The aim of the present work was to replace the alumina for metallic grit in order to yield a similar or higher adherence of the coating. Two commercial grits (alumina and steel) were used for prepari...
Conference Paper
Full-text available
Laser was used as a rapid heating and vitrifying way to yield high Fe bearing glasses for biomedical applications. The high amount of Fe2O3 (40-80%), which is an intermediary (instead of a glass forming) oxide, implies a difficult formation of glass. Therefore a rapid cooling appeared to be necessary. Compacted powders were exposed to a 45-90 W las...
Article
Full-text available
Aerosol flame spraying (AFS) combines the atomization of a colloidal suspension with the lateral injection of the aerosol in a flame. The aerosol droplets are partially dried when crossing the flame and then deposited as a coating onto a substrate. Afterwards, the coating is consolidated by heat treatment without extensive grain growth. In this pap...
Article
Cenosphere formation is a current phenomenon common during spray drying suspensions. An impervious crust is formed as the surface of sprayed droplets is dried by the hot gas, and the residual water inside the droplet is overheated, and breaks part of the crust (1). This phenomenon is likely to occur at higher droplet diameter, higher gas temperatur...
Conference Paper
Aerosol Flame Spraying (A.F.S) combines the atomization of a colloidal suspension with the lateral injection of the aerosol in a flame. The aerosol droplets are partially dried when crossing the flame and deposited as a coating onto a substrate. The coating is then consolidated by a heat treatment. In this paper, a modeling of the trajectories, acc...
Article
Aerosol Flame Spraying (A.F.S) combines the atomization of a colloidal suspension with the lateral injection of the aerosol in a flame. The aerosol droplets are partially dried when crossing the flame and deposited as a coating onto a substrate. The coating is then consolidated by a heat treatment. In this paper, a modeling of the trajectories, acc...
Article
Full-text available
RESUMEN : Se propone una técnica sencilla de medición de espesor de recubrimientos espesos (1-100 µm) no consolidados (friables), mediante la realización de un escalón en el recubrimiento y su observación con un microscopio óptico, aprovechando su baja profundidad de campo (menos de 1 µm) y la existencia de un tornillo micrométrico graduado para en...
Article
Dispersed and flocculated alumina (non-spherical particles) slurries were prepared by pH controlling with HCl. Spray-drying of these resulted in dimpled granules with a smooth surface and high density, and spherical granules with rough surface and low-density, respectively. Detailed characterization on granules and their compacts includes: SEM obse...
Article
Full-text available
Zirconia is evermore in demand as a thermal barrier coating (TBC) for energy economy and metal protection. Several methods are in use to produce the coatings, including sol-gel, CVD and PVD, however laser ablation, has not been notoriously reported. The present work presents the use of a N2-SF6 pulsed laser beam, focused (6 J/cm2) on a metallic zir...
Article
Production of Cerium Stabilized Tetragonal Zirconia Polycrystals (Ce-TZP) powders at low temperature by a chemical route has been investigated. Ce-TZP compositions have been prepared by adding cerium nitrate to a hydrothermally synthesized monoclinic zirconia sol. The settling behaviour of the sol-salt suspension has been studied at different molar...
Article
Results of an experimental study of the oxidation of a zirconium plasma generated by laser ablation of a metallic target under low pressures of oxygen are presented. The crystallographic identification of the collected product by electronic diffraction shows metastable ZrO cubic phase. The oxidation phenomena are interpreted by thermochemical simul...
Poster
Full-text available
La necesidad de obtener materiales con propiedades y características cada vez más específicas, ha impulsado el uso de reactor es de plasma térmico en aplicaciones que incluyen reacciones químicas para la síntesis de nuevos materiales.

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