6. Processing and Characterization
Powder Processing — Quiz
Test your understanding of powder processing with 5 practice questions.
Practice Questions
Question 1
In spark plasma sintering (SPS) compared to conventional hot pressing, the principal heating mechanism is:
Question 2
In liquid-phase sintering, a contact angle θ between liquid and solid phases greater than 90° leads to:
Question 3
Calculate the specific surface area S (in $\mathrm{m^2/kg}$) of spherical powder particles with diameter d=$20\times10^{-6}$\,$\mathrm{m}$ and material density $\rho$=8000\,$\mathrm{kg/m^3}$ using S=$\frac{6}{d\rho}$.
Question 4
In laser powder-bed fusion, the volumetric energy density E_v (in kJ/mm) is given by E_v=$\frac{P}{v\,h\,t}$. Calculate E_v for P=200\,$\mathrm{W}$, v=1000\,$\mathrm{mm/s}$, h=0.1\,$\mathrm{mm}$, and t=0.02\,$\mathrm{mm}$.
Question 5
A powder exhibits a tapped density of 1.5\,$\mathrm{g/cm^3}$ and a bulk density of 1.2\,$\mathrm{g/cm^3}$. Its Hausner ratio is HR=\frac{\rho_{tapped}}{\rho_{bulk}}=1.25. How would you classify its flowability?