1578
The process of solidification and cooling occur in a closed chamber in an argon atmosphere so as to prevent oxidation of the melt pool .
 concept or principle: process; concept or principle: solidification; manufacturing process: cooling; machine or equipment: closed chamber; process parameter: argon atmosphere; material: as; manufacturing process: oxidation; material: melt pool
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: process; concept or principle: solidification; manufacturing process: cooling; machine or equipment: closed chamber; process parameter: argon atmosphere; material: as; manufacturing process: oxidation; material: melt pool