The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Christian Coddet - One of the best experts on this subject based on the ideXlab platform.

  • Study on the mechanism of adhesion improvement using dry-ice blasting for plasma-sprayed Al2O3 coatings
    Journal of Thermal Spray Technology, 2013
    Co-Authors: Shujuan Dong, BERNARD HANSZ, H B Liao, Bo Song, Christian Coddet
    Abstract:

    Dry-ice blasting, as an environment-friendly method, was introduced for the first time into atmospheric plasma spraying for improving properties of Al \n 2O\n 3 coatings. The tensile adhesion of the coating was examined. The microstructure of the coating was characterized using scanning electron microscopy. The temperature evolutions during the spraying were measured using an Infrared Pyrometer measurement system. The adhesive strength of Al\n 2O\n 3 coating deposited with dry-ice blasting exceeded 60 MPa, which was nearly increased by 30% compared with that of the coating deposited with conventional air cooling. The comparison of adhesions and microstructures of Al\n 2O\n 3 coatings plasma-sprayed with dry-ice blasting and with air cooling revealed that dry-ice blasting can optimize the coated substrate besides a cooling effect, and consequently resulted in the improved adhesion of plasma-sprayed Al\n 2O\n 3 coatings. © 2011 Elsevier B.V.

  • Property improvement of plasma-sprayed FeAl coating by dry-ice blasting
    Proceedings of the International Thermal Spray Conference, 2012
    Co-Authors: Bo Song, BERNARD HANSZ, H B Liao, Shujuan Dong, Christian Coddet, Thierry Grosdidier
    Abstract:

    Atmospheric plasma spray is considered as one of the most efficient methods for forming FeAl intermetallic coatings. But the performance of plasma-sprayed FeAl coatings was remarkably limited because of oxidation and phase transformation during the preparation. In the present work, FeAl intermetallic coatings were prepared by atmospheric plasma spray combined with dry-ice blasting. The microstructure, oxidation and porosity of FeAl intermetallic coatings were investigated. In addition, XRD measurements were also employed to illustrate the lattice-scale performance, e.g., dislocation density. The temperatures during plasma spray were also measured using an Infrared Pyrometer system. The results show that a denser B2-FeAl coating with a lower content of oxide and lower phase transformation can be achieved because of the cryogenic effect and the mechanical effect of dry-ice blasting. Moreover, the microhardness of FeAl coating was nearly increased by 72%, due to the lower porosity and higher dislocation density. Copyright 2012 ASM International® All rights reserved.

  • improvement of adhesion of plasma sprayed al2o3 coatings by using dry ice blasting
    Materials Letters, 2012
    Co-Authors: Shujuan Dong, BERNARD HANSZ, Bo Song, Christian Coddet
    Abstract:

    Abstract Dry-ice blasting, as an environment-friendly method, was introduced for the first time into atmospheric plasma spraying for improving properties of Al 2 O 3 coatings. The tensile adhesion of the coating was examined. The microstructure of the coating was characterized using scanning electron microscopy. The temperature evolutions during the spraying were measured using an Infrared Pyrometer measurement system. The adhesive strength of Al 2 O 3 coating deposited with dry-ice blasting exceeded 60 MPa, which was nearly increased by 30% compared with that of the coating deposited with conventional air cooling. The comparison of adhesions and microstructures of Al 2 O 3 coatings plasma-sprayed with dry-ice blasting and with air cooling revealed that dry-ice blasting can optimize the coated substrate besides a cooling effect, and consequently resulted in the improved adhesion of plasma-sprayed Al 2 O 3 coatings.

C.c. Doumanidis - One of the best experts on this subject based on the ideXlab platform.

  • Temperature distribution control in scanned thermal processing of thin circular parts
    IEEE Transactions on Control Systems Technology, 2001
    Co-Authors: C.c. Doumanidis, N. Fourligkas
    Abstract:

    Scan thermal processing is enabled by guidance of the heat source trajectory during fabrication. For thin, cylindrically symmetric parts, this is performed by their rapid revolution under a radially or axially translated torch, with its power modulated so as to implement a specified thermal distribution as it sweeps the product surface, and thus to generate desirable material features. A new analytical description of the thermal field in thin disk-shaped parts, based on superposition of Green's functions, was developed for off-line analysis. A multivariable linearized model with least-squares identification of its varying parameters was also derived for real-time emissivity compensation and prediction of delayed temperature data. This model is embedded to a thermal distribution control scheme, driving the scanned torch motion and power by a new real-time simulated annealing optimization strategy, using temperature feedback from randomly sampled surface locations by an Infrared Pyrometer. The thermal regulator is validated computationally and experimentally.

  • Thermal distribution control in scanned processing of materials
    Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207), 1998
    Co-Authors: N. Fourligkas, C.c. Doumanidis
    Abstract:

    Scan thermal processing, enabled by guidance of the heat source trajectory during fabrication, combines the flexibility of sequential methods to the productivity of parallel processes. For cylindrically symmetric parts, this is performed by their rapid revolution under a radially or axially translated torch. The source power is modulated to implement a specified thermal distribution as it sweeps the product surface, and thus to generate desirable material features. An analytical description of the thermal field, based on superposition of Green's fields, is developed for off-line analysis. Also, a multivariable model with least-squares parameter identification, is introduced for real-time compensation of the process efficiency. This model is embedded to a thermal distribution control scheme, driving the scanned torch motion and power by a simulated annealing optimization strategy. This uses temperature feedback from random surface locations by an Infrared Pyrometer. The thermal regulator is validated computationally and experimentally, and its applicability to other scanned processes is examined.

  • Active optimal scanning control in thermal processing of materials
    Proceedings of the 1997 IEEE International Conference on Control Applications, 1997
    Co-Authors: C.c. Doumanidis
    Abstract:

    Scan thermal processing, enabled by active guidance of the heat source motion during fabrication, combines the flexibility of sequential methods to the productivity of parallel thermal processes. For cylindrically symmetric parts, this is performed by their rapid revolution under a radially or axially translated torch, with its power modulated so as to implement a specified thermal distribution as it sweeps the product surface, and thus to generate desirable material features. An analytical description of the thermal field, based on superposition of Green's fields, was developed for off-line analysis, as well as a multivariable linearized model with least-squares identification of its varying parameters, for real-time compensation of the process efficiency. This model is embedded in an active thermal control scheme, driving the scanned torch motion and power by a simulated annealing optimization strategy, using temperature feedback from sampled surface locations by an Infrared Pyrometer. The thermal regulator is validated by computation and experiment and its applicability to other scanned processes is examined.

Surjya K. Pal - One of the best experts on this subject based on the ideXlab platform.

N. Fourligkas - One of the best experts on this subject based on the ideXlab platform.

  • Temperature distribution control in scanned thermal processing of thin circular parts
    IEEE Transactions on Control Systems Technology, 2001
    Co-Authors: C.c. Doumanidis, N. Fourligkas
    Abstract:

    Scan thermal processing is enabled by guidance of the heat source trajectory during fabrication. For thin, cylindrically symmetric parts, this is performed by their rapid revolution under a radially or axially translated torch, with its power modulated so as to implement a specified thermal distribution as it sweeps the product surface, and thus to generate desirable material features. A new analytical description of the thermal field in thin disk-shaped parts, based on superposition of Green's functions, was developed for off-line analysis. A multivariable linearized model with least-squares identification of its varying parameters was also derived for real-time emissivity compensation and prediction of delayed temperature data. This model is embedded to a thermal distribution control scheme, driving the scanned torch motion and power by a new real-time simulated annealing optimization strategy, using temperature feedback from randomly sampled surface locations by an Infrared Pyrometer. The thermal regulator is validated computationally and experimentally.

  • Thermal distribution control in scanned processing of materials
    Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207), 1998
    Co-Authors: N. Fourligkas, C.c. Doumanidis
    Abstract:

    Scan thermal processing, enabled by guidance of the heat source trajectory during fabrication, combines the flexibility of sequential methods to the productivity of parallel processes. For cylindrically symmetric parts, this is performed by their rapid revolution under a radially or axially translated torch. The source power is modulated to implement a specified thermal distribution as it sweeps the product surface, and thus to generate desirable material features. An analytical description of the thermal field, based on superposition of Green's fields, is developed for off-line analysis. Also, a multivariable model with least-squares parameter identification, is introduced for real-time compensation of the process efficiency. This model is embedded to a thermal distribution control scheme, driving the scanned torch motion and power by a simulated annealing optimization strategy. This uses temperature feedback from random surface locations by an Infrared Pyrometer. The thermal regulator is validated computationally and experimentally, and its applicability to other scanned processes is examined.

Shujuan Dong - One of the best experts on this subject based on the ideXlab platform.

  • Study on the mechanism of adhesion improvement using dry-ice blasting for plasma-sprayed Al2O3 coatings
    Journal of Thermal Spray Technology, 2013
    Co-Authors: Shujuan Dong, BERNARD HANSZ, H B Liao, Bo Song, Christian Coddet
    Abstract:

    Dry-ice blasting, as an environment-friendly method, was introduced for the first time into atmospheric plasma spraying for improving properties of Al \n 2O\n 3 coatings. The tensile adhesion of the coating was examined. The microstructure of the coating was characterized using scanning electron microscopy. The temperature evolutions during the spraying were measured using an Infrared Pyrometer measurement system. The adhesive strength of Al\n 2O\n 3 coating deposited with dry-ice blasting exceeded 60 MPa, which was nearly increased by 30% compared with that of the coating deposited with conventional air cooling. The comparison of adhesions and microstructures of Al\n 2O\n 3 coatings plasma-sprayed with dry-ice blasting and with air cooling revealed that dry-ice blasting can optimize the coated substrate besides a cooling effect, and consequently resulted in the improved adhesion of plasma-sprayed Al\n 2O\n 3 coatings. © 2011 Elsevier B.V.

  • Property improvement of plasma-sprayed FeAl coating by dry-ice blasting
    Proceedings of the International Thermal Spray Conference, 2012
    Co-Authors: Bo Song, BERNARD HANSZ, H B Liao, Shujuan Dong, Christian Coddet, Thierry Grosdidier
    Abstract:

    Atmospheric plasma spray is considered as one of the most efficient methods for forming FeAl intermetallic coatings. But the performance of plasma-sprayed FeAl coatings was remarkably limited because of oxidation and phase transformation during the preparation. In the present work, FeAl intermetallic coatings were prepared by atmospheric plasma spray combined with dry-ice blasting. The microstructure, oxidation and porosity of FeAl intermetallic coatings were investigated. In addition, XRD measurements were also employed to illustrate the lattice-scale performance, e.g., dislocation density. The temperatures during plasma spray were also measured using an Infrared Pyrometer system. The results show that a denser B2-FeAl coating with a lower content of oxide and lower phase transformation can be achieved because of the cryogenic effect and the mechanical effect of dry-ice blasting. Moreover, the microhardness of FeAl coating was nearly increased by 72%, due to the lower porosity and higher dislocation density. Copyright 2012 ASM International® All rights reserved.

  • improvement of adhesion of plasma sprayed al2o3 coatings by using dry ice blasting
    Materials Letters, 2012
    Co-Authors: Shujuan Dong, BERNARD HANSZ, Bo Song, Christian Coddet
    Abstract:

    Abstract Dry-ice blasting, as an environment-friendly method, was introduced for the first time into atmospheric plasma spraying for improving properties of Al 2 O 3 coatings. The tensile adhesion of the coating was examined. The microstructure of the coating was characterized using scanning electron microscopy. The temperature evolutions during the spraying were measured using an Infrared Pyrometer measurement system. The adhesive strength of Al 2 O 3 coating deposited with dry-ice blasting exceeded 60 MPa, which was nearly increased by 30% compared with that of the coating deposited with conventional air cooling. The comparison of adhesions and microstructures of Al 2 O 3 coatings plasma-sprayed with dry-ice blasting and with air cooling revealed that dry-ice blasting can optimize the coated substrate besides a cooling effect, and consequently resulted in the improved adhesion of plasma-sprayed Al 2 O 3 coatings.