Microstructure and wear properties of laser clad (Ti,Mo)C multiple carbide reinforced Fe-based composite coating / Xinhong Wang in Transactions of the ASME . Journal of tribology, Vol. 132 N° 4 (Octobre 2010)  

Public ISBD [article]  inTransactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 05 p. Titre : Microstructure and wear properties of laser clad (Ti,Mo)C multiple carbide reinforced Fe-based composite coating Type de document : texte imprimé Auteurs : Xinhong Wang, Auteur ; Min Zhang, Auteur ; Shiyao Qu, Auteur Année de publication : 2011 Article en page(s) : 05 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Cladding techniques Claddings Cracks Crystallisation Dissolving Iron Laser materials processing Molybdenum compounds Nucleation Particle reinforced composites size Titanium Wear resistance resistant coatings Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : (Ti,Mo)C multiple carbide reinforced Fe-based composite coating was produced by laser melting a precursor mixture graphite, ferrotitanium (Fe–Ti), and ferromolybdenum (Fe–Mo) powders. The results showed that flowerlike and cubic type (Ti,Mo)C multiple carbides were formed during laser cladding process. The selective area diffraction pattern analysis indicated that (Ti,Mo)C crystallizes with cubic structure, which indicates that (Ti,Mo)C carbides were multiple carbides with Mo dissolved in the TiC structure. The formation of (Ti,Mo)C particles was achieved via a nucleation-growth mechanism during the laser cladding process. Increasing the amount of Fe–Mo in the reactants led to a decrease of carbide size and an increase of volume fraction of carbides. The coating possessed good cracking resistance when the amount of Fe–Mo was controlled within a range of 15 wt %. The Fe-based surface coating reinforced by (Ti,Mo)C multiple carbides gave an excellent wear resistance. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Microstructure and wear properties of laser clad (Ti,Mo)C multiple carbide reinforced Fe-based composite coating [texte imprimé] / Xinhong Wang, Auteur ; Min Zhang, Auteur ; Shiyao Qu, Auteur . - 2011 . - 05 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 05 p. Mots-clés : Cladding techniques Claddings Cracks Crystallisation Dissolving Iron Laser materials processing Molybdenum compounds Nucleation Particle reinforced composites size Titanium Wear resistance resistant coatings Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : (Ti,Mo)C multiple carbide reinforced Fe-based composite coating was produced by laser melting a precursor mixture graphite, ferrotitanium (Fe–Ti), and ferromolybdenum (Fe–Mo) powders. The results showed that flowerlike and cubic type (Ti,Mo)C multiple carbides were formed during laser cladding process. The selective area diffraction pattern analysis indicated that (Ti,Mo)C crystallizes with cubic structure, which indicates that (Ti,Mo)C carbides were multiple carbides with Mo dissolved in the TiC structure. The formation of (Ti,Mo)C particles was achieved via a nucleation-growth mechanism during the laser cladding process. Increasing the amount of Fe–Mo in the reactants led to a decrease of carbide size and an increase of volume fraction of carbides. The coating possessed good cracking resistance when the amount of Fe–Mo was controlled within a range of 15 wt %. The Fe-based surface coating reinforced by (Ti,Mo)C multiple carbides gave an excellent wear resistance. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

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Modeling of α-olefin copolymerization with chain-shuttling chemistry using dual catalysts in stirred-tank reactors: molecular weight distributions and copolymer composition / Min Zhang in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8135–8146 Titre : Modeling of α-olefin copolymerization with chain-shuttling chemistry using dual catalysts in stirred-tank reactors: molecular weight distributions and copolymer composition Type de document : texte imprimé Auteurs : Min Zhang, Auteur Année de publication : 2010 Article en page(s) : pp 8135–8146 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalys Molecular weight Copolymer composition. Résumé : We report a kinetic model of chain-shuttling copolymerization using dual catalysts for solution α-olefin polymerization processes. This model focuses on predicting polymer properties such as the molecular weight and molecular weight distribution and the overall copolymer composition. We first validate the model through qualitative comparison between the model predictions and experimental observations reported in Arriola et al. ( Science2006, 312, 714) in both a semibatch reactor and a continuous stirred-tank reactor (CSTR). Then, examples are given to illustrate how the model can be used to examine the effects of the chain-shuttling rate constant and the chain-shuttling-agent feed rate in a CSTR. Moreover, simulations using this model demonstrate how to prepare polymers with desired properties by manipulating catalyst compositions and monomer compositions in the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100530p [article] Modeling of α-olefin copolymerization with chain-shuttling chemistry using dual catalysts in stirred-tank reactors: molecular weight distributions and copolymer composition [texte imprimé] / Min Zhang, Auteur . - 2010 . - pp 8135–8146. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8135–8146 Mots-clés : Catalys Molecular weight Copolymer composition. Résumé : We report a kinetic model of chain-shuttling copolymerization using dual catalysts for solution α-olefin polymerization processes. This model focuses on predicting polymer properties such as the molecular weight and molecular weight distribution and the overall copolymer composition. We first validate the model through qualitative comparison between the model predictions and experimental observations reported in Arriola et al. ( Science2006, 312, 714) in both a semibatch reactor and a continuous stirred-tank reactor (CSTR). Then, examples are given to illustrate how the model can be used to examine the effects of the chain-shuttling rate constant and the chain-shuttling-agent feed rate in a CSTR. Moreover, simulations using this model demonstrate how to prepare polymers with desired properties by manipulating catalyst compositions and monomer compositions in the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100530p

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