The production method for this composite material involves directly mixing the graphite crucible with metal uniformly, then pressing it into shape to form the composite material. There are two mixing methods: one involves directly adding metal powder to the graphite crucible, and the other involves coating the graphite crucible with a metal film using hot metal vapor.
Direct Metal Powder Mixing Method and Spraying Method
Direct Mixing Method: The direct mixing method is a dry mixing process. Metal powder is directly added to the graphite crucible, mechanically stirred to mix, and then pressed into shape. The forming method and process are relatively simple. The resulting material has good properties, particularly improved mechanical strength, thermal shock resistance, and corrosion resistance.
For example, a composite material made by adding aluminum powder to the graphite crucible has a dense structure with minimal residual air, preventing surface peeling and delamination, and exhibiting excellent thermal properties. Aluminum is the best metal composite component. The amount of aluminum powder added is only 2 to 10% of the graphite powder by weight. Due to the stronger affinity between aluminum powder and the graphite crucible compared to the affinity between aluminum powder particles, the aluminum powder acts as a binder in the material.
Spraying Method: The spraying method is an improvement over the direct mixing method. After mixing the ingredients, the graphite crucible, or a graphite crucible with added inorganic binder, is sprayed with a metal dispersion liquid and then pressed into shape. This mixing method allows the metal powder and graphite powder to mix more uniformly, resulting in a composite material with better performance. The production process is also relatively simple.