1926
Processing of Si and hydroxyapatite reinforced Ti6Al4Vmatrix compositesusinglaser-based directed energy deposition ( DED ) from powder blends .
 Si, hydroxyapatite, directed energy deposition, DED, powder blends
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:
 Si, hydroxyapatite, directed energy deposition, DED, powder blends