Relation between green density & compaction pressure - Material Science

Q.  Which of the following statements is true for green density?
- Published on 05 Aug 15

a. Green density increases when particle strength increases
b. Green density decreases when compacting speed decreases
c. Green density increases when compaction pressure increases
d. Green density decreases when apparent density increases

ANSWER: Green density increases when compaction pressure increases

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    Discussion

  • Sravanthi   -Posted on 07 Oct 15
    The ratio of metal powder volume and volume of external printed part is called as green density. Green density measures how tightly the powder particles are packed in printed part.

    - Green density depends upon compacting speed, particle hardness, compaction pressure, apparent density or particle size.

    - Green density increases if compaction pressure increases.

    - If particle hardness decreases green density increases.

    - Green density of cube, cylinder or tetragon is determined by their weights and dimensions.

    - Green density for irregular shaped compact is measured in air and water by weighing the sample. It is denoted as gm/cc.

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