Laser surface refinement of YBa2Cu3Ox superconductor

Shih, Chung-Yu; Molian, Pal; McCallum, R. W.

doi:10.1007/bf00368937

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…Liu [35] obtained similar results in laser-sealed Y 2 O 3 ±ZrO 2 and MgO±ZrO 2 ceramic coatings. Shih et al [39] observed that, across a YBa 2 Cu 3 O x and laser-clad track, di erent microstructures were found in di erent regions, and Shieh [40] made similar observations across a SiO 2 ±Al 2 O 3 laserclad track. Additionally, both noted not only that cellular and dendritic microstructures were visible but also that the microstructures were much ®ner on the edge of the clad track than at the centre.…”

Section: The E Ect Of Beam Shape and The Resulting Temperature Distributionmentioning

confidence: 83%

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

Líu

Lawrence

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

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Surface energy must in some way be connected to surface chemistry and is therefore an important determinant of a biomaterial's functions. This work elucidates the basic phenomena and wetting mechanisms associated for a widely used bioinert ceramic, magnesia partially stabilized zirconia (MgO-PSZ) following CO 2 laser treatment. Contact angles for a set of test liquids were used to measure the wettability characteristics and to reduce the surface energy of the MgO-PSZ before and after CO 2 laser treatment. CO 2 laser treatment of the MgO-PSZ surface was seen to e ect an improvement in the material's wettability characteristics. Furthermore, it was found that the extent of wettability modi®cation was closely related to the microstructure induced by CO 2 laser radiation on the surface of the MgO-PSZ. Keywords

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Section: The E Ect Of Beam Shape and The Resulting Temperature Distributionmentioning

confidence: 83%

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

Líu

Lawrence

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Similar results were obtained by Liu [3] after laser sealing Y 2 O 3 -ZrO 2 and MgO-ZrO 2 ceramic coatings. Shih et al [4] observed that across a YBa 2 Cu 3 O x laser clad track different microstructures were found in different regions; Shieh [5] obtained a similar result across a SiO 2 -Al 2 O 3 laser clad track. Additionally, both workers noted that not only were cellular and dendritic microstructures visible, but also that the microstructures were much finer on the edge of the clad track than in the centre.…”

Section: Introductionmentioning

confidence: 85%

On the role of microstructure form and dimension in surface energy changes in a magnesia partially stabilized zirconia bioceramic following CO₂laser irradiation

Hao

Lawrence

2003

J. Phys. D: Appl. Phys.

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This work elucidates the basic mechanisms active in microstructure and the associated surface energy for a widely used bioinert ceramic, magnesia partially stabilized zirconia (MgO–PSZ) following CO2 laser treatment. CO2 laser irradiation results in rapid heating of the surface and consequently leads to the surface densification and crystal growth in the melted layer of the MgO–PSZ. There was an increase in the tetragonal phase after CO2 laser treatment and columnar crystal structure in the upper-most layer and irregular grain in the heat affected zone. Various power densities of laser treatment brought about different microstructures on the modified MgO–PSZ. Contact angle measurement of a set of test liquids was used to estimate the surface energy of the MgO–PSZ before and after CO2 laser treatment. It was found that the surface energy of MgO–PSZ had been enhanced after CO2 laser treatment and its increase was related to the phase change (represented by microstructure) and crystal size of MgO–PSZ.

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“…Similar results were obtained by Liu [15] after laser sealing Y 2 O 3 -ZrO 2 and MgO-ZrO 2 ceramic coatings. Shih et al [16] observed that across a YBa 2 Cu 3 O x and laser clad track different microstructures were found in different regions, as did Shieh et al [17] across a SiO 2 -Al 2 O 3 laser clad track. Additionally, both workers noted that not only were cellular and dendritic microstructures visible, but the microstructures were much finer on the edge of the clad track than in the centre as well.…”

Section: Introductionmentioning

confidence: 94%

Examination of CO2 laser-induced rapid solidification structures on magnesia partially stabilised zirconia and the effects thereof on wettability characteristics

Hao

Lawrence

Lim

2004

Optics and Lasers in Engineering

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Laser surface refinement of YBa2Cu3Ox superconductor

Cited by 7 publications

References 18 publications

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

On the role of microstructure form and dimension in surface energy changes in a magnesia partially stabilized zirconia bioceramic following CO₂laser irradiation

Examination of CO2 laser-induced rapid solidification structures on magnesia partially stabilised zirconia and the effects thereof on wettability characteristics

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Laser surface refinement of YBa2Cu3Ox superconductor

Cited by 7 publications

References 18 publications

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

On the role of laser-induced microstructures in influencing the surface energy of magnesia partially stabilized zirconia bioceramic

On the role of microstructure form and dimension in surface energy changes in a magnesia partially stabilized zirconia bioceramic following CO2laser irradiation

Examination of CO2 laser-induced rapid solidification structures on magnesia partially stabilised zirconia and the effects thereof on wettability characteristics

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On the role of microstructure form and dimension in surface energy changes in a magnesia partially stabilized zirconia bioceramic following CO₂laser irradiation