Question:
Compression ratio is defined as:
Compression ratio is defined as:
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Compression ratio helps assess how much a powder is compacted from its loose state to a green compact — key for optimizing pressure and tooling design.
Updated On: Jun 20, 2025
- Ratio of green density to apparent density
- Ratio of height to diameter
- Ratio of sintered strength to green strength
- Ratio of apparent density to tap density
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The Correct Option is A
Solution and Explanation
In powder metallurgy and compaction processes, the compression ratio is a key parameter that indicates how efficiently the powder has been compacted.
It is defined as:
\[ \text{Compression Ratio} = \frac{\text{Green Density}}{\text{Apparent Density}} \]
Where:
- Green density is the density of the compacted powder before sintering.
- Apparent density refers to the bulk density of loose powder in its free-flowing state.
A higher compression ratio indicates more compaction pressure is needed to achieve the desired green density. This directly affects mechanical properties, dimensional accuracy, and sintering performance.
The other options do not represent the definition of compression ratio in this context.
It is defined as:
\[ \text{Compression Ratio} = \frac{\text{Green Density}}{\text{Apparent Density}} \]
Where:
- Green density is the density of the compacted powder before sintering.
- Apparent density refers to the bulk density of loose powder in its free-flowing state.
A higher compression ratio indicates more compaction pressure is needed to achieve the desired green density. This directly affects mechanical properties, dimensional accuracy, and sintering performance.
The other options do not represent the definition of compression ratio in this context.
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