Term Paper Presentation Rpdt (1)

8/10/2019 Term Paper Presentation Rpdt (1)

1/28

name: navneet chaharroll no: 1310308


2/28

SLS is superior to other rapid manufacturingtechniques because of the wide variety ofmaterials it can process.

The materials include:

1. Wax

2. Cermets

3. Ceramics

4. nylon


3/28

5. Composite

6. Metal polymer

7. Metals and alloys etc.

Any material can be combined with a lowmelting point material which will serve asglue/binder in SLS.


4/28

SLS also processes bio materials forfabricating scaffolds in tissue engineeringscaffolds.

SLS can be used to process almost anymaterials provided it is available as powderand the powder particles tend to fuse whenheat is applied.


5/28


6/28

Most polymers used in SLS arethermoplastics.

Thermoplascs

Amorphous crystalline


7/28

Amorphous polymers are able to produceparts with very good dimensional accuracyand surface finish but they are only partiallydense.

Typical application is silicone rubber and

epoxy molds. Parts made of these are only useful for

application that do not require part strength.

Semi crystalline polymers can be sintered to

fully dense parts. Prototypes employed where wear resistance is

the main consideration.


8/28

Other polymer based materials are acrylicstyrene for investment casting and anelastomer for rubber like applications.

The mechanical properties are greatlyaffected by the process parameters for ex.Nylon 12 modulus is 10% less than that ofinjection moulded part. This is due to theporosity in the laser sintered part.


9/28

Glass filled polyamide (PA 3200 GF) hasexcellent mechanical properties and highaccuracy can be used in SLS.

Application of these materials are housingand parts used under elevated temperatureconditions.

Copper polyamide(intro. 1998) is a thermally

conductive composite of copper and plasticand can be used to create tooling.


10/28

Low material strength are the limitation inapplication of copper polyamide moulds.

Windform XT is a carbon filled polyamidewhich produces black parts with a smoothfinish and a sparkling appearance.

It has low density and a high tensile strength.


11/28

SLS allows producing metallic parts usingsome kind of sacrificial polymer binder.

During early stages SLS of powder materialproved unsuccessful due to balling, to

overcome this two phase powder approachwas used.

DTM has developed rapidsteel powdercomposed of 60% SS and 40% bronze.

It has better hardness, machinability,weldability, and thermal conductivity thansteel powder coated with a thermoplastic.


12/28

Laserform ST-100 is the latest toolingmaterial to replace rapidsteel 2.0 and copper

polyamide. It is fully dense after LS and has a surface

roughness of 5 micron. Instead of using polymer binder direct

sintering of metal powder is also done andthen infiltrated with epoxy to fill the pores. The driving force for binding is physical

diffusion of metal atoms and thus a slowphenomenon.

The best combination for metal sintering is ofiron and copper.


13/28


14/28

Functionally graded materials are a newgeneration material having continuous ordiscretely changing thermal and mechanicalproperties at the macroscopic or continuum

scale.

SLS can fabricate such heterogeneous objects


15/28

SLS fabricated objects are usually porous. This porosity is a key property in biomedical

applications, including artificial bones andtissue engineering fields.

Polymethyl methacrylate coated calciumpowder have been processed,polycaprolactone, a bioresrbable polymer are

used for bone and cartilage tissueengineering.


16/28

Basic materials used in FDM are ABS,Polyamide, Polycarbonate, Polyethylene,Polypropylene.

In special FDM application silicon nitrate, PZT,aluminum oxide, hydroxypatite, and SS.

FDM materials allows to manufacture realparts that are tough enough for prototyping,

functional testing, installation and mostimportantly end use.


17/28

Environmentally stable No appreciable warpage, shrinkage.

Works well with soluble support materials,support removal is hands free.

40% stronger that standard materials.

Offers widest range of color available withFDM technology.


18/28

Versatile material Good for form, fit and moderate durable

parts.

25-30% stronger than standard ABS material.

Its the lowest cost material in the range ofthermoplastic that work with FORTUS360mc, 400mc, 900mc.

Ideal for jigs, fixtures and manufacturingtooling.


19/28

Bio compatible material. Sterilizable using gamma radiation or ETO

sterilized.

Soluble support material.

Works with FORTUS 400mc, 900mc.

Ideal material for medical, pharmaceutical,and food packaging.


20/28

Translucent material. Available in amber, red and natural color.

Ideal for automotive tail lens and aerospaceapplication.

Allows monitor fluid movement such as inmedical device.


21/28

Most widely used industrial thermoplastic. Accurate, durable and stable for strong parts.

High tensile strength and can handle hightemperature.

Used for parts in house, in automobiles andcommercial equipment.


22/28


23/28

Strongest and most heat resistant Biocompatible material available with FDM.

Works with breakaway support material.

Gamma or ETO sterilized.

Used for drug, food packaging and medicalapplication.


24/28

Highest heat and chemical resistance of allFDM materials.

Resistance to petroleum and solvents.


Produce under the hood automotive,sterilizable medical devices, and tooling fordemanding application.


25/28

Developed primarily for the aerospaceindustry and also has application in themarine and other niche industries.

Lightweight, flame retardant .

V zero rating for flame, smoke and toxicity.

High strength to weight ratio.



26/28

For application where a static charge coulddamage components, impair performance orcause an explosion.

Uses soluble support.

Can be used in presence of powder, dust andmist.

Used for creating jigs and fixtures for

assembling electronic component, functionalprototype for fuel storage.


27/28

FDM nylon 12:100-300% better elongation at break and superiorfatigue strength and excellent chemical resistance.

Rutgers university have used the process tofabricate functional components of a varietyof ceramic and metallic material such assilicon nitrate, PZT,Al2O3, hydroxypatite.


28/28

They mixed ceramic powder with organicpowder which improved the property likeflexibility, stiffness, and viscosity.

Parts undergo further processing to remove

the organic binder and then sintered toachieve densification.

Term Paper Presentation Rpdt (1)

Documents