Performance-enhanced vertical LED using laser irradiation treatment to control wafer-level n-GaN protrusion arrays

1998 ◽

Author(s):

Z. Zhou ◽

N. Eguchi ◽

H. Shirasawa ◽

A. Ohmori

Keyword(s):

Laser Irradiation ◽

Plasma Spraying ◽

Barrier Properties ◽

Thermal Barrier ◽

Irradiation Treatment ◽

Hybrid Plasma ◽

Sprayed Coating ◽

Steel Substrates ◽

High Temperature Erosion

Abstract Hybrid plasma spraying combined with YAG laser irradiation was studied in order to obtain the optimum zirconia coatings for thermal barrier use. Zirconia coatings of approximately 150 ;Um in thickness were formed on the NiCrAlY under coated steel substrates both by means of conventional plasma spraying and hybrid plasma spraying under a variety of conditions. Post-laser irradiation was also conducted on the plasma as-sprayed coating for comparison. The microstructure of each coating was studied in detail and, for some representative coatings, thermal barrier properties were evaluated by hot erosion and a hot oxidation test. With hybrid spraying, performed under optimum conditions, it was found that a microstructure with appropriate partial densification and without connected porosities was formed and that cracks, which are generally produced in the post-laser irradiation treatment, were completely inhibited. In addition, hybrid spraying formed a smooth coating surface. These microstructural changes resulted in improved coating properties with regard to hardness, high temperature erosion resistance and oxidation resistance.

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Low-level laser irradiation treatment reduces CCL2 expression in rat rheumatoid synovia via a chemokine signaling pathway

Lasers in Medical Science ◽

10.1007/s10103-011-0917-y ◽

2011 ◽

Vol 26 (5) ◽

pp. 707-717 ◽

Cited By ~ 20

Author(s):

Lin Zhang ◽

Jian Zhao ◽

Noboru Kuboyama ◽

Yoshimitsu Abiko

Keyword(s):

Laser Irradiation ◽

Signaling Pathway ◽

Low Level ◽

Low Level Laser ◽

Chemokine Signaling ◽

Level Laser ◽

Ccl2 Expression ◽

Irradiation Treatment ◽

Chemokine Signaling Pathway ◽

Low Level Laser Irradiation

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Life prediction method of copper thin film repaired by laser irradiation based on healing variable

International Journal of Damage Mechanics ◽

10.1177/1056789516645643 ◽

2016 ◽

Vol 26 (7) ◽

pp. 1028-1042 ◽

Cited By ~ 1

Author(s):

Chong-Gang Ren ◽

De-Guang Shang

Keyword(s):

Laser Irradiation ◽

Life Prediction ◽

Copper Film ◽

Prediction Method ◽

Cyclic Stress ◽

Notched Specimens ◽

Constitutive Relationships ◽

Irradiation Treatment ◽

Before And After ◽

Good Agreement

The cyclic stress–strain constitutive relationships for copper film smooth specimens with different damage degrees before and after laser irradiation treatment were investigated. Compared with the changes of the constitutive relationships under different damage degrees, a healing variable for the repaired copper film by laser irradiation was defined. Based on the analysis of the healing variable, a fatigue life prediction method was proposed. The experimental lives of the damaged notched specimens after laser irradiation treatment were used to verify the proposed life prediction method. The results showed that the predicted lives are in good agreement with the experimental results.

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