1. Selective Separation
Sintering
Research Advisor: Dr. Ted Lee
Research Coordinator: Dr. Jing Zhang
Research Student: Tiffany Cheng

2. Overview
 What is Selective Separation Sintering?
 Research Purpose
 Summary of tasks
 Goals
 Current Results

3. What is Selective Separation
Sintering?
 Powder layer based additive manufacturing approach
 Can fabricate high temperature ceramic, metallic, and
polymer parts

4. How It Works
1) Needle carves shape and injects ceramic material
2) Halogen lamp shines on the polymer powder to solidify
it
3) A second layer powder is placed on the surface
Steps 1-3 is repeated for multiple layers
Ceramic material allows the rest of the solidified
polymer powder to be separated from the product

5. Research Purpose
 To modify the speed of the heat source so that polymer
powder can be cured properly
 To test different heat sources to see what works better
with polymers

6. Summary of Tasks
 Do material background research – Nylon 12 used
 Design support for halogen lamp using solid works
 Test different speeds and record effects on the polymer

7. Apparatus Used
 3D Printing machine for ceramic and metallic powder
=> Modified to work with polymers

8. Halogen Lamp Set Up
Halogen Lamp Set up
Halogen Lamp Support Close up

9. Goals
 To be able to get a smooth and flat product surface
 Make sure that the polymer is not overly sintered

10. Methodology
 Try different speeds
 Try different heat sources- halogen lamp

11. Observations
 Halogen Lamp works well
 The time is takes to solidify is around ~36 seconds

12. Calculations
 Using energy balance to solve for v (velocity)

13. Calculations Cont.

14. Conclusions
 ~2x10-3 m/s = 2mm/s
 ~25 seconds

15. Current Results and Findings

16. Other Tasks: Designing Auger and
Casing for Low Pressure Extrusion

17. Other tasks: Low Pressure
Extrusion

18. References
Jing’s Thesis on Selective Separation Shaping
 http://sffsymposium.engr.utexas.edu/sites/default/file
s/2015/2015-6-Zhang.pdf
Patent on Use of Nylon 12 for Selective Laser Sintering
 http://www.google.com/patents/CA2251405C?cl=en
Nylon 12 Material Data Sheet
 http://polymerdatabase.com/polymers/nylon12.html

19. Questions/Comments?