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Their results showed that the vacuum infiltration process was able to significantly increase the density , reduce the porosity and increase the strength of the 3D-printed alumina components .
 biomedical: vacuum infiltration process; machanical property: density; machanical property: porosity; machanical property: strength; manufacturing process: 3D-printed; machine or equipment: components
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:
 biomedical: vacuum infiltration process; machanical property: density; machanical property: porosity; machanical property: strength; manufacturing process: 3D-printed; machine or equipment: components