7293
Addition of Co in LC1 at the expense of Fe ( Fe−x-Cr-Mo-W-V-Cox ) significantly increased the overall coating hardness by strengthen the matrix .
 material: Co; material: Fe; application: coating
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: Co, Fe, coating 
Answer:
 material: Co; material: Fe; application: coating