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The results showed that bonding strength increased with decreasing spray angle from the normal direction ( 90° spray angle ) , and the maximum bonding strength was observed at 45° spray angle ; however , the deposition efficiency and strength of the bulk deposit material decreased with decreasing spray angle .
 bonding strength, bonding strength, deposition, strength, material
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:
 bonding strength, bonding strength, deposition, strength, material