Investigation Of Microhardness Properties Of MgB2 Produced By Using Carbon Doped Boron By CVD Method

Abstract

In this study, magnesium diborite which is obtained with boron element which is of strategic importance for our country and which has a very wide usage area in technological terms, is produced by using carbon doped boron obtained by chemical vapor deposition method. First of all, amorphous nano boron powders were doped with CVD method at 700 oC for 90 minutes under the source of ethylene hydrocarbon and inert gas flow. The amorphous nano boron powders doped in carbon were mixed with magnesium powders weighed in certain stoichiometric proportions in an automatic mixer. The mixture was weighed in 2,5 gs and converted into 4 tablets by manual pressing method. Each tablet was wrapped in zirconium foil and sintered under closed argon gas at temperatures of 700-800-900 and 1000 oC. Structural and mechanical properties of the obtained samples were investigated. According to the results of the analysis, it was seen that the characteristic peaks of MgB2 were predominant in all samples and the best explaining micro hardness properties of the samples were Meyer approach and IIC (Indentation-Induced Cracking) approach. In addition, RISE (Riverse Indentation Size Effect) behavior was detected in all samples.

Keywords

• cvd
• mgb2
• rise