I am working on a project Process optimization of warm sintering process.
Process Description
I have a cylindrical DIE, My powder part is if filled in the die with the additives added. The powder is compacted inside the die simultaneously the temperature of the DIE is increased.
I would want to find the theoretical relation for the density and the factors affecting the density.
For example (Temperature, pressure, hold time, specific heat of the powder metal, thermal conductivity, grain size etc) I do not know what are the factors that affects the density and how to approach (is Buckingham's Pi Theorem is good approach.?) or is there any other approach.?
Maybe You will find in this paper useful equations that relate density, temperature, grain growth (only for kramic samples) for non-isothermal sintering
Actually I'm doing for both warm and cold compaction . I have some doubts on cold compaction. How does temperature affect if the binder used is not aqueous solution in cold compaction (cold Sintering process).
Use Dilatometer there is a company in Switzerland that can prepare this unit Taylor made to your requirement . the company is NETZCH
I would start with TGA-DTA analysis of your prepared control sample mixes which will provide you density vs temperature. DTGA analysis (Coats and Redfern 1960) will then give you any decompositions occurring such as water in drying and gas release from binders, oxides etc. I would then expect that once all metal, it is pretty much incompressible.
You have a simplified relation that relate temperature pressure and grain size for Hot die pressing in "https://www.researchgate.net/publication/294422391_A_predictive_model_to_reflect_the_final_stage_of_spark_plasma_sintering_of_submicronic_a-alumina"
Best regard
Article A predictive model to reflect the final stage of spark plasm...
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