Reaction container and vacuum heat treatment apparatus having the same

A vacuum heat treatment apparatus for preparing silicon carbide powder, comprising:

• a chamber;
• a reaction container in the chamber;
• and
• a heating member to heat the reaction container in the chamber,
• wherein the reaction container comprises graphite, and has density of about 1.8 g/cm3 to about 2.1 g/cm3,
• wherein the graphite comprises a graphite mixture obtained by mixing first and second graphite powders having particle sizes different from each other,
• wherein the particle size of the first graphite powder is in a range of about 5 μm, to about 5 μm,
• wherein the particle size of the second graphite powder is in a range of about 0.02 μm to about 2 μm, and
• wherein the porosity of the reaction container is in a range of about 5% to about 20%.

A vacuum heat treatment apparatus for preparing silicon carbide powder, comprising:

• a chamber;
• a reaction container in the chamber;
• mixing materials in the reaction container;
• a heating member to heat the reaction container in the chamber,
• wherein the mixing materials comprise a carbon source and a silicon source,
• wherein the reaction container comprises graphite, has the carbon source impregnated in the reaction container, and has density of about 1.8 g/cm3 to about 2.1 g/cm3, and
• wherein a porosity of the reaction container is in a range of about 5% to about 20%.