Podcast
Questions and Answers
What was the first commercialized PBF process developed at the University of Texas at Austin, USA?
What was the first commercialized PBF process developed at the University of Texas at Austin, USA?
- Binder jetting
- Direct metal laser sintering (DMLS)
- Selective laser sintering (SLS) (correct)
- Electron beam melting (EBM)
What are the most common thermal sources for PBF processes?
What are the most common thermal sources for PBF processes?
- Lasers (correct)
- Electric arcs
- Chemical reactions
- Microwaves
What were LS processes originally developed to produce?
What were LS processes originally developed to produce?
- Composite materials
- Metal components
- Ceramic molds
- Plastic prototypes (correct)
What do all PBF processes share in terms of characteristics?
What do all PBF processes share in terms of characteristics?
What is one negative effect of loose powder sintering?
What is one negative effect of loose powder sintering?
What positive effect does loose powder sintering have on the powder bed?
What positive effect does loose powder sintering have on the powder bed?
What causes a region of the powder bed to become much hotter than the surrounding loose powder during part formation?
What causes a region of the powder bed to become much hotter than the surrounding loose powder during part formation?
What is the primary function of the counter-rotating powder leveling roller in Powder Bed Fusion processes?
What is the primary function of the counter-rotating powder leveling roller in Powder Bed Fusion processes?
Why is an enclosed chamber filled with nitrogen gas used in Powder Bed Fusion processes?
Why is an enclosed chamber filled with nitrogen gas used in Powder Bed Fusion processes?
What thermal source is directed onto the powder bed to thermally fuse the material in Powder Bed Fusion processes?
What thermal source is directed onto the powder bed to thermally fuse the material in Powder Bed Fusion processes?
Why is a cool-down period required after completing each layer in Powder Bed Fusion processes?
Why is a cool-down period required after completing each layer in Powder Bed Fusion processes?
Which type of materials are well-suited for powder bed processing due to their low melting temperatures, low thermal conductivities, and low tendency for balling?
Which type of materials are well-suited for powder bed processing due to their low melting temperatures, low thermal conductivities, and low tendency for balling?
Which type of materials are suitable for making sacrificial patterns for investment casting using pLS?
Which type of materials are suitable for making sacrificial patterns for investment casting using pLS?
What aids in melting out the investment casting pattern after creating the ceramic shell?
What aids in melting out the investment casting pattern after creating the ceramic shell?
Which type of polymers are resistant to degradation at elevated temperatures and chemicals like gasoline and automotive coolants?
Which type of polymers are resistant to degradation at elevated temperatures and chemicals like gasoline and automotive coolants?
Which commercially available polymers for 3D printing are flame-retardant?
Which commercially available polymers for 3D printing are flame-retardant?
Which composite materials have been investigated for bone replacement tissue scaffolds?
Which composite materials have been investigated for bone replacement tissue scaffolds?
What type of fillers can polymers in PBF have to enhance their mechanical properties?
What type of fillers can polymers in PBF have to enhance their mechanical properties?
Which metals can be processed using PBF?
Which metals can be processed using PBF?
What was RapidSteel developed by DTM Corp composed of?
What was RapidSteel developed by DTM Corp composed of?
What did LaserForm ST-100 allow for due to its broader particle size range?
What did LaserForm ST-100 allow for due to its broader particle size range?
What proprietary powders did EOS market for direct tooling applications and parts requiring high thermal and electrical conductivities?
What proprietary powders did EOS market for direct tooling applications and parts requiring high thermal and electrical conductivities?
Which alloys are widely available for PBF production?
Which alloys are widely available for PBF production?
What are the fusion mechanisms present in PBF processes?
What are the fusion mechanisms present in PBF processes?
What did Phenix Systems develop commercial machines for?
What did Phenix Systems develop commercial machines for?
What is the primary fusion mechanism in most AM processes?
What is the primary fusion mechanism in most AM processes?
Which materials have been processed using PBF for medical applications?
Which materials have been processed using PBF for medical applications?
What did advancements in mLS and EBM processes lead to?
What did advancements in mLS and EBM processes lead to?
What are ceramics composed of?
What are ceramics composed of?
Why are some alloys obsolete in favor of engineering-grade alloys?
Why are some alloys obsolete in favor of engineering-grade alloys?
What happens to crystal structures and mechanical properties in mLS?
What happens to crystal structures and mechanical properties in mLS?
Flashcards are hidden until you start studying
Study Notes
Powder Bed Fusion Processes Overview
- mLS and EBM technology have made some alloys obsolete in favor of engineering-grade alloys.
- Titanium alloys, steel alloys, nickel-based super alloys, and CoCrMo are widely available for PBF production.
- Alloys that crack under high solidification rates are not suitable for mLS.
- Crystal structures and mechanical properties differ in mLS due to high solidification rates.
- Advancements in mLS and EBM processes will lead to the development of new alloys tailored for PBF production.
- Ceramics consist of metal oxides, carbides, and nitrides, and are available commercially.
- Phenix Systems in France, acquired by 3D Systems, developed commercial machines for ceramics.
- Ceramics and metal-ceramic composites have been demonstrated in research.
- Biocompatible materials like calcium hydroxyapatite have been processed using PBF for medical applications.
- Four fusion mechanisms are present in PBF processes: solid-state sintering, chemically induced binding, liquid-phase sintering, and full melting.
- Solid-state sintering occurs at elevated temperatures without melting, driven by the minimization of total free energy of powder particles.
- Sintering is important in most thermal powder processes, but few AM processes use sintering as a primary fusion mechanism.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
