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Inconel 718 Filamet™ pellets

Ref.: TVF-PELLETS-INCONEL-1KG

630.00 €

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Inconel 718 Filamet™ pellets are small cylinders composed of PLA with Inconel 718 metal filler. These pellets are composed of 86% metal and the rest of PLA.

PLA (polylactic acid) is a biodegradable plastic obtained from natural resources such as starch extracted from corn, sugar beet and wheat. PLA is one of the most widely used materials in 3D printing today because it does not give off harmful gases and is easy to print.

Inconel is the recognised brand name for nickel-chromium based superalloys. These alloys are characterised by their high corrosion resistance, capable of working under the most extreme conditions. This is due to the fact that, when heated, a thin oxide layer is formed that passivates the surface and protects it from chemical attack, while improving its surface hardness. In addition to its extraordinary resistance to corrosion, it has excellent resistance to high temperatures and can be used in conditions where other metals such as aluminium or steel would suffer creep.

In addition to the intrinsic properties of Inconel 718, Inconel 718 Filamet™ pellets from The Virtual Foundry (TVF) are perfect for 3D printing, achieving high print quality, and stand out from other metal-filled materials by allowing the user to obtain all-metal parts after a sintering process.

3D printed part with Inconel pellets 86% Source: The Virtual Foundry

During the sintering process the PLA is removed, resulting in all-metal parts with real metal properties, but with some porosity and a reduction in volume due to the loss of PLA.

Inconel 718 Filamet™ pellets are free of exposed metal particles and volatile solvents that can be released during the 3D printing process, making it a safe material for 3D printing. In addition, due to their PLA content, they are very easy to process. There are several methods for using pellets in 3D printing:

inconel 718 Filamet™ pellets can be used in the production of filament for FDM 3D printers using Filastruder or any other filament extruder.
It is possible to use a pellet extruder directly.

When using inconel 718 Filamet™ pellets to produce filament with a filament extruder such as Filastruder or using a pellet extruder for direct 3D printing, it should be noted that the extrusion temperature must be regulated in relation to the extrusion speed used. For optimal results, it is recommended to read the product's usage tips.

General information
Material	Metal + binder
Format	1 kg
Density	4.5 g/cm³
Amount of filler (volume)	66 %
Amount of filler (mass)	86 %

Thermal properties
Melting temperature	- ºC
Softening temperature	- ºC
Processing temperature	225 ºC
MFR Ratio	-
Glass transition temperature	- ºC
Heat deflexion temperature	- ºC

Sintering properties
Container	Refractory crucible
Refractory powder	Al2O3
Maximum temperature	1260 ºC

Specific properties
Transparency	-
Radiation protection (without sintering)	✗

Other
HS Code	7406.1

Due to the high amount of metal particles, clogging may occur in nozzles with a diameter of 0.4 mm, so it is recommended to use nozzles with an outlet diameter of more than 0.5 mm.

As far as infill, the average recommended amount is 30-70 % but it largely depends on what kind of part the user wants to obtain and whether the part will be sintered or not. For more indepth information please watch this video:

Video 1: The recommended infill for the TVF materials. Source: TVF.

It is very important to store inconel 718 Filamet™ pellets in an airtight bag to prevent them from absorbing moisture from the environment before use. If the pellets have moisture in them, the filament to be manufactured may contain small imperfections.

Once the filament has been manufactured using inconel 718 Filamet™ pellets, it is also recommended to store the filament in a dry place or in an airtight bag. This prevents the filament from absorbing moisture, thus obtaining better results during 3D printing.

Whether using a filament extruder such as Filastruder or a direct pellet extruder, parts 3D printed with inconel 718 Filamet™ pellets must undergo a sintering process to achieve all-metal parts.s:

Sintering process

Necessary materials:

Metallurgical furnace
Refractory crucible
Refractory powder
Sinter carbon

STEP 1: Placing the piece

Fill the crucible with refractory powder leaving 40 mm free on the surface of the crucible.
Immerse the piece in the refractory powder making sure to leave a gap of at least 15 mm between the surface of the piece and the walls and upper and lower parts of the crucible. The refractory powder must not be compacted.
Fill the free 40 mm on the surface of the crucible with sinter carbon.
Place the crucible in the furnace.

STEP 2: Thermal debind

Heat up to 204 ºC.
Keep at 204 ºC for 2 hours.
Heat up to 427 ºC at a speed of 1.86 ºC/min.
Keep at 427 ºC for 2 hours.

STEP 3: Sintering

Heat up to 593 ºC at a speed of 1.86 ºC/min.
Keep at 593 ºC for 2 hours.
Heat up to 1260 ºC at a speed of 5.5 ºC/min
Keep at 1260°C for 4 hours*.

STEP 4: Cooling

Cooling up to 593 ºC at a speed of 0.18 ºC/min
Allow to cool to room temperature.

* Recommended time for a cube up to 50mm. For larger pieces it will be necessary to increase the time.

Users who do not have a furnace with the necessary properties to sinter parts printed with Pellets inconel 718 Filamet™ and achieve the final properties of this metal, can contact us and we will assess their viability through our collaborators with the capacity to perform the necessary post-processing to obtain the desired final result.