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A net-shape synthesis process has been used to convert different isovolumetric precursor mixtures composed of either 100 vol % 86/14 molar Cr/Cr2O3 or 50 vol % 86/14 molar Cr/Cr2O3 with 50 vol % Cr3C2 to form multilayer chromium carbide materials suitable for reactive powder bed fusion additive manufacturing .
 concept or principle: process; material: precursor; material: chromium carbide; manufacturing process: powder bed fusion additive manufacturing
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: process, precursor, chromium carbide, powder bed fusion additive manufacturing 
Answer:
 concept or principle: process; material: precursor; material: chromium carbide; manufacturing process: powder bed fusion additive manufacturing