First metal print with my pellet extruder! 100% stainless steel after sintering. What should I print next? reddit.com/gallery/kkuawh
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πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/rigazbalzamz
πŸ“…︎ Dec 27 2020
🚨︎ report
Is sintering an endothermic or exothermic process?

I'm working on a paper on a material that was annealed at different temperatures and and the DSC graph shows a major peak between the temperature of sintering and the temperature just before it. However, when searching sources as to whether sintering is endothermic or exothermic, I came up empty handed.

I believe sintering in general is exothermic, because it's spontaneous (Ξ”G<0) and results in lower entropy (Ξ”S<0), so it must release energy (Ξ”G=Ξ”H-TΞ”S, so Ξ”H<0). However, I'm not sure my thought process is right since sintering is not really a chemical process, so I don't know if Gibbs Free energy actually applies. Help, please?

πŸ‘︎ 3
πŸ“°︎ r/askscience
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πŸ‘€︎ u/gustbr
πŸ“…︎ Jan 14
🚨︎ report
Microwave Sintering of Lunar Soil: Possible or Just Proposal?

Hey guys, aero engineer here getting a masters in additive. Got an interesting project going where I am disseminating a large amount of info from various sources on 3d printing lunar regolith by Microwave Sintering. A lot of the papers I am turning up on it are mostly theory and I am finding a surprisingly little amount of information on microwave sintering in general. Anyone have any knowledge base on this as a strategy for printing lunar soil or any other kind of feedstock for that matter?

NASA appears to think that the ideal holds water as some of their latest proposals on IRSU methods have included the technology but I am wondering if something has ever been built to even run on lunar regolith simulant. The attached photo is an excerpt from a paper called "Faxing Structures to the Moon: Freeform Additive Construction System (FACS)" and explores the idea without going into hard technical details. It'd be cool to get some insights from this group on this approach to ISRU on the moon.

https://preview.redd.it/k6wazwa2zow51.jpg?width=633&format=pjpg&auto=webp&s=86c681bc1b45530d49c144f610b8ff91fc1458a1

πŸ‘︎ 23
πŸ’¬︎
πŸ“…︎ Nov 01 2020
🚨︎ report
preparing landing pads on the moon by laser sintering

there seems to be talk of the need of landing pads on the moon to not fling dust and pebbles into some serious suborbital trajectories, and for the most part the answer seems to be to yolo it for a while and construct pads when you get there. what if we could prepare the surface without actually going there? a low lunar orbit satellite with a serious laser could sinter the surface into a hard shell. not a lot of progress needs to be made every pass for it to be able to finish a pad in a year or two. assuming the sat stores the power needed while its on the sun side so it can dump it while passing over it could double as a power sat for bases not on the poles, which is convenient since the sat pretty much has to be in a near equatorial orbit to get a shot every pass, or fly over the poles with the landing pad there

thought id edit in some back of the envelope maths after some discussing and thinking, keep in mind im no laser engineer and id love for someone with know how to correct or add anything. a lunar orbit is about 2 hours, meaning at least an hour of sunlight. if you can store all of this it means you get about 60 times the wattage of your solar panels as laser output if you have a minute of time on target (idk if that is a huge assumption, but it might not be that big of a deal). the question is basically how much energy you are able to dump through a laser and how fast. if i unitize this to a 10kw laser i need 0.16m^2 of solar panel (just scale up for losses, 0.16 m^2 isnt a lot for anyone), 0.6kg of lithium ion battery (at 265 wh/kg) and whatever heatsinks and cooling is needed. this doesent have to be a huge package, so a bunch can be taken for required energy output. if more time is needed to heat the material deeper several sats can be used (2 sats would give 2 minutes of laser power, 5 5 minutes etc).

obviously im assuming this isnt workable, but im just some guy, and i have to start somewhere.

πŸ‘︎ 66
πŸ“°︎ r/SpaceXLounge
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πŸ‘€︎ u/ravenerOSR
πŸ“…︎ Apr 11 2020
🚨︎ report
Spark Plasma Sintering of Metallic Carbides, to 1600C reddit.com/rpan/r/shortci…
πŸ‘︎ 3
πŸ“°︎ r/shortcircuit
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πŸ‘€︎ u/doooooiiitttt
πŸ“…︎ Oct 05 2020
🚨︎ report
Electron microscope footage of in-situ gold nano particles sintering (3x speed) v.redd.it/ep7ul75g4ii41
πŸ‘︎ 2k
πŸ“°︎ r/chemistry
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πŸ“…︎ Feb 22 2020
🚨︎ report
First attempt at sintering Filamet Ceramic PLA. The copper filament is next. reddit.com/gallery/ik0ryg
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πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/The_Throatbeard
πŸ“…︎ Aug 31 2020
🚨︎ report
Microwave Sintering of Lunar Soil: Possible or Just Proposal? /r/AdditiveManufacturing/…
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πŸ“°︎ r/materials
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πŸ“…︎ Nov 01 2020
🚨︎ report
Crucible for sintering refractory metals

Hello! I'm a beginner to working with metals. I'm working in academia and want to attempt the synthesis of a refractory alloy, via sintering compacted fine powders of Molybdenum, Tantalum, and Tungsten among some lighter metals. Initial thoughts suggests a sintering temperature of around 1700 - 1800C. Does anybody have some suggestions as to types of crucibles that would be suitable for such a task?

E.g. Tungsten / silicon carbide maybe? Zirconia? or would an alumina crucible suffice?

Thanks

πŸ‘︎ 7
πŸ“°︎ r/Metalfoundry
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πŸ‘€︎ u/JesteroftheForest
πŸ“…︎ Oct 12 2020
🚨︎ report
critical viscosity of sintering

not sure if this is the right place to ask, but here goes:

due to glass transition, amorphous particles can sinter together. this sintering bridges can be modeled by Frenkel's equation. using said equation, one can predict the critical viscosity at which glass transition or stickiness occurs.

my question is: why would anyone want to know the viscosity? ive read some papers saying that it is an advantage as a viscometer wouldnt be needed. but apart from that, what is the point of it? can viscosity be related to environmental conditions eg. temperature/RH at which glass transition occurs or something?

any help is much appreciated

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πŸ“°︎ r/materials
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πŸ‘€︎ u/lifetimesadness
πŸ“…︎ Oct 05 2020
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Sintering Furnace - with Molybdenum Disilicide Heating Elements - for Manufacture of Zirconia Dental Implants [1756Γ—1080]
πŸ‘︎ 522
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πŸ‘€︎ u/PerryPattySusiana
πŸ“…︎ May 15 2020
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[Watchmaking] Laser Sintering Repair of Pocketwatch Case!
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πŸ“°︎ r/Watches
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πŸ‘€︎ u/CCWatchmaking
πŸ“…︎ Jul 20 2020
🚨︎ report
Small Metal Parts Entering a Sintering Furnace on Metal Link Conveyor Belt [1024Γ—0576]
πŸ‘︎ 846
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πŸ‘€︎ u/PerryPattySusiana
πŸ“…︎ Apr 06 2020
🚨︎ report
[Joint help] Can I make a joint by filling it with powder and sintering the powder onto the two parts?

If this isn't the correct sub, can you direct me to the right one?

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πŸ“°︎ r/metallurgy
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πŸ“…︎ Jul 17 2020
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Metal filament for sintering other than The Virtual Foundry and Ultrafuse?

I'm currently looking up on filament producers that make metal filaments for sintering, does anyone know any other than these two?

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πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/No-Engineer471
πŸ“…︎ Sep 29 2020
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Fabrication of ultra-high-temperature nonstoichiometric hafnium carbonitride via combustion synthesis and spark plasma sintering - ScienceDirect sciencedirect.com/science…
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πŸ“°︎ r/science
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πŸ‘€︎ u/NavdeepSinghThind
πŸ“…︎ Jun 02 2020
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debinding and sintering in my garage

how does one debind and sinter metal based filaments like basf 316l metal filament.

and no.

i am not trying to pimp the 316 stuff.

but their method is the only one in town.

currently

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πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/RedSeal5
πŸ“…︎ Aug 28 2020
🚨︎ report
Direct Metal Laser Sintering for a small v6 engine block
πŸ‘︎ 280
πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/mike_makeros
πŸ“…︎ Jan 24 2020
🚨︎ report
#3Dstartup: Metallum3D offers microwave sintering for metal AM - 3Dnatives 3dnatives.com/en/3dstartu…
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πŸ“°︎ r/3Dprinting
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πŸ‘€︎ u/B20bob
πŸ“…︎ Sep 11 2020
🚨︎ report
Interlock Defeat key for working on high power lasers.... Is it still worth it if I used laser sintering instead of filament extrusion? It's still 3D printing technically....
πŸ‘︎ 19
πŸ“°︎ r/functionalprint
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πŸ‘€︎ u/andrevergamito
πŸ“…︎ May 28 2020
🚨︎ report
Questions regarding Sintering

Hello,

I am currently studying the sintering of metals like Fe, Ag, Ni and Cu in my lab, and am currently looking for information about the Sintering Temperature - Time curves for these metals. Unfortunately, I am unable to find information about the same. If someone could provide me with reading material for the same, that would be of great help.

Thank You!

πŸ‘︎ 3
πŸ“°︎ r/metallurgy
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πŸ‘€︎ u/EzioViknesh1008
πŸ“…︎ May 11 2020
🚨︎ report
Development of microwave-assisted sintering of Portland cement raw meal sciencedirect.com/science…
πŸ‘︎ 2
πŸ“°︎ r/energy
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πŸ‘€︎ u/cheaptrainride
πŸ“…︎ May 15 2020
🚨︎ report
QUESTION: What is the current state (and future) of laser sintering 3d printers?

Hey boys quick question, how far along is the holy grail of 3D laser sintering? The last i checked it was still extremely expensive, and there was still debate as to whether it was actually going to be able to produce hard use steel products

Some people where saying that laser sintering only produces weak steel and others where saying that laser sintering produces hard use aerospace parts in airplanes

I still don't know what do believe

Also people are saying that the patent for laser sintering is going to expire soon and when that happens you will see laser sintering 3d printers drop in price

I don't know if that is true but i wanted to ask you guys and see what you know and if you had any sources to back it up, thanks!

πŸ‘︎ 13
πŸ“°︎ r/GunnitRust
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πŸ‘€︎ u/How_To_Freedom
πŸ“…︎ Feb 04 2020
🚨︎ report
Electron microscope footage of in-situ gold nano particles sintering (3x speed) v.redd.it/ep7ul75g4ii41
πŸ‘︎ 76
πŸ“°︎ r/EngineeringPorn
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πŸ‘€︎ u/jourmungandr
πŸ“…︎ Feb 22 2020
🚨︎ report
Microwave Sintering of Lunar Soil: Possible or Just Proposal?

Hey guys, aero engineer here getting a masters in additive. Got an interesting project going where I am disseminating a large amount of info from various sources on 3d printing lunar regolith by Microwave Sintering. A lot of the papers I am turning up on it are mostly theory and I am finding a surprisingly little amount of information on microwave sintering in general. Anyone have any knowledge base on this as a strategy for printing lunar soil or any other kind of feedstock for that matter?

NASA appears to think that the ideal holds water as some of their latest proposals on IRSU methods have included the technology but I am wondering if something has ever been built to even run on lunar regolith simulant. The attached photo is an excerpt from a paper called "Faxing Structures to the Moon: Freeform Additive Construction System (FACS)" and explores the idea without going into hard technical details. It'd be cool to get some insights from this group on this approach to ISRU on the moon.

https://preview.redd.it/54cutvq7yow51.jpg?width=633&format=pjpg&auto=webp&s=6f84abfa28ae52c615d0ad4dfc3bedf716fa47ec

πŸ‘︎ 18
πŸ’¬︎
πŸ“…︎ Nov 01 2020
🚨︎ report

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