6038
Unimodal powder samples of different narrow particle size distributions between 16 and 184 μm were sintered with a 40 W CO2 laser , using laser scan speeds of either 50 or 100 mm s−1 and , in both cases , a scanning energy of 160 J m−1 .
 powder, particle size distributions, sintered, CO2, laser scan, mm, scanning
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 powder, particle size distributions, sintered, CO2, laser scan, mm, scanning