Carbon nanotube-based coatings for laser power and energy measurements

2005 ◽  
Author(s):  
John Lehman ◽  
Natalia Varaksa ◽  
Theo Theocharous ◽  
Anne Dillon
Keyword(s):  
Carbon Nanotube ◽  
Laser Power ◽  
Power And Energy

scholarly journals Manufacturing Aluminum/Multiwalled Carbon Nanotube Composites via Laser Powder Bed Fusion

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3927
Author(s):  
Eo Ryeong Lee ◽  
Se Eun Shin ◽  
Naoki Takata ◽  
Makoto Kobashi ◽  
Masaki Kato
Keyword(s):  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Energy Density ◽  
Laser Power ◽  
Multiwalled Carbon Nanotube ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Multiwalled Carbon ◽  
Powder Bed ◽  
Scan Speed

This study provides a novel approach to fabricating Al/C composites using laser powder bed fusion (LPBF) for a wide range of structural applications utilizing Al-matrix composites in additive manufacturing. We investigated the effects of LPBF on the fabrication of aluminum/multiwalled carbon nanotube (Al/MWCNT) composites under 25 different conditions, using varying laser power levels and scan speeds. The microstructures and mechanical properties of the specimens, such as elastic modulus and nanohardness, were analyzed, and trends were identified. We observed favorable sintering behavior under laser conditions with low energy density, which verified the suitability of Al/MWCNT composites for a fabrication process using LPBF. The size and number of pores increased in specimens produced under high energy density conditions, suggesting that they are more influenced by laser power than scan speed. Similarly, the elastic modulus of a specimen was also more affected by laser power than scan speed. In contrast, scan speed had a greater influence on the final nanohardness. Depending on the laser power used, we observed a difference in the crystallographic orientation of the specimens by a laser power during LPBF. When energy density is high, texture development of all samples tended to be more pronounced.

Paper 7: Laser Power and Energy Measurement by Photoelectric Techniques

1968 ◽  
Vol 183 (4) ◽  
pp. 34-37
Author(s):  
K. Firth ◽  
M. B. Davies
Keyword(s):  
Output Power ◽  
Laser Power ◽  
Energy Measurement ◽  
Power And Energy ◽  
Photoelectric Devices

The use of photoelectric devices for measuring the output power and energy of pulsed and c.w. lasers is well established. This paper describes the principles, limitations, and advantages of the method. The precautions which must be taken to ensure accurate and reproducible results are also discussed in some detail.

Sign in / Sign up

Export Citation Format

Share Document