<![CDATA[SoliForum - 3D Printing Community — Filament with metal powder]]> 2014-07-04T10:42:45Z PunBB https://www.soliforum.com/topic/6841/filament-with-metal-powder/ <![CDATA[Re: Filament with metal powder]]> elmoret wrote:

The supplied motor produces less than 10W of mechanical power. I doubt excessive pressures are possible. Even still, if the barrel split there would be nearly zero stored energy (as contrasted with compressible gasses). I've blocked the nozzle before with no ill effects, usually the extruder screw stalls (keeps rotating but pressure does not increase). I would surmise that the deadhead pressure is only a few hundred PSI.

With that said, thanks for sharing your experience here!

Good point! I guess the screw design also doesn't allow too much pressure to build either.

]]> https://www.soliforum.com/user/6410/ 2014-07-04T10:42:45Z https://www.soliforum.com/post/59773/#p59773 <![CDATA[Re: Filament with metal powder]]> Hi Jesse: we will be doing these same experiments this summer. I will let you and the rest of this forum know how it turns out.   What we don't have is a brabender or banbury mixer, which helps to compound the particles into the plastic uniformly. So I will use plastics I can solvate, (e.g. ABS)

]]> https://www.soliforum.com/user/6410/ 2014-07-04T10:38:37Z https://www.soliforum.com/post/59772/#p59772 <![CDATA[Re: Filament with metal powder]]> If anyone's interested in trying it, I can buy the powder and have it shipped to you.

The catch is I would like some filament assuming it works.

]]> https://www.soliforum.com/user/1984/ 2014-07-04T01:51:46Z https://www.soliforum.com/post/59756/#p59756 <![CDATA[Re: Filament with metal powder]]> nanolab wrote:

Another obvious note is to ensure that your particles are small enough for your die.  In practice, that means the particles must be smaller than 1/12 of the die diameter.  My only worry with the filastruder is the lack of a die pressure gauge.  Its nice to know if your pressure is climbing out of the realm of safety.

The supplied motor produces less than 10W of mechanical power. I doubt excessive pressures are possible. Even still, if the barrel split there would be nearly zero stored energy (as contrasted with compressible gasses). I've blocked the nozzle before with no ill effects, usually the extruder screw stalls (keeps rotating but pressure does not increase). I would surmise that the deadhead pressure is only a few hundred PSI.

With that said, thanks for sharing your experience here!

]]> https://www.soliforum.com/user/221/ 2014-07-02T21:42:58Z https://www.soliforum.com/post/59657/#p59657 <![CDATA[Re: Filament with metal powder]]> Hi all:
We are working with adding carbon nanotubes to ABS and to a TPE with good results, although our loadings are modest.  In the past, I extruded ceramic polymer blends through a 1" 24:1 killion extruder.  I extruded a piezoelectric material (PZT), the YBaCuO superconductor, and a ferrite ceramic, often in a LDPE at loadings up to 50wt%. The wear was not as bad as you'd expect. The trick for all of them was to add a very low molecular weight lubricant to the blend.  I used a couple types of oils to drop the extrusion pressure and lubricate the particles as they flow thru the die.
Another obvious note is to ensure that your particles are small enough for your die.  In practice, that means the particles must be smaller than 1/12 of the die diameter.  My only worry with the filastruder is the lack of a die pressure gauge.  Its nice to know if your pressure is climbing out of the realm of safety.
Once we finish with the CNT loaded ABS, we will be looking at metal filled filament.
thanks,
David C.

]]> https://www.soliforum.com/user/6410/ 2014-07-02T21:11:04Z https://www.soliforum.com/post/59655/#p59655 <![CDATA[Re: Filament with metal powder]]> elmoret wrote:

Its hard for me to buy that. Shapeways told me their test sample extruder's nozzles wear out pretty quickly on alumina powder. Maybe ColorFabb has some secret sauce, but I'd think sliding an abrasive which is harder than the orifice material through said orifice would produce wear.

Ceramic coating on the nozzle?  Titanium Nitride?

]]> https://www.soliforum.com/user/78/ 2014-07-02T14:22:33Z https://www.soliforum.com/post/59624/#p59624 <![CDATA[Re: Filament with metal powder]]> elmoret wrote:

Maybe ColorFabb has some secret sauce, but I'd think sliding an abrasive which is harder than the orifice material through said orifice would produce wear.

Lube?

]]> https://www.soliforum.com/user/55/ 2014-06-30T20:42:53Z https://www.soliforum.com/post/59543/#p59543 <![CDATA[Re: Filament with metal powder]]> Its hard for me to buy that. Shapeways told me their test sample extruder's nozzles wear out pretty quickly on alumina powder. Maybe ColorFabb has some secret sauce, but I'd think sliding an abrasive which is harder than the orifice material through said orifice would produce wear.

]]> https://www.soliforum.com/user/221/ 2014-06-30T19:59:01Z https://www.soliforum.com/post/59541/#p59541 <![CDATA[Re: Filament with metal powder]]> jamesshuang wrote:

I've thought about doing that, but those metal powders tend to be abrasive. You'd have to replace the nozzle relatively frequently from what I've heard...

According to colorFabb, the metal powder is very fine and does not wear down the nozzle opening.  They mentioned that they plan to release other metal powder filament in the future.

]]> https://www.soliforum.com/user/1984/ 2014-06-30T19:41:49Z https://www.soliforum.com/post/59539/#p59539 <![CDATA[Re: Filament with metal powder]]> I've thought about doing that, but those metal powders tend to be abrasive. You'd have to replace the nozzle relatively frequently from what I've heard...

]]> https://www.soliforum.com/user/4506/ 2014-06-30T02:18:07Z https://www.soliforum.com/post/59499/#p59499 <![CDATA[Filament with metal powder]]> I lent my Filastruder to a fellow 3d printer and don't have the ability to test this myself.

Is anyone interested in mixing some metal powder into filament?

Powders: http://www.ebay.com/sch/mercurysavage/m.html

Example: http://www.3ders.org/articles/20140512- … nters.html

]]> https://www.soliforum.com/user/1984/ 2014-06-28T21:23:57Z https://www.soliforum.com/post/59484/#p59484