RADIATION SHIELDING IN SPACE EXPLORATION–(D) RADIATION SHIELDING OF COMPOSITE SPACE ENCLOSURES


(BEING CONTINUED FROM 22/01/14)

V. EXPERIMENTAL TECHNIQUE
The work has focused on the preparation,dispersion, adhesion and orientation of nanofillers
into composite laminate for obtaining the required  functionality. The target has been to optimize the two
technologies proposed for this integration (direct  resin bulk doping and buckypaper manufacturing for
later resin infiltration) in order to obtain:

· An optimal and stable dispersion of nanofillers  into the final laminate
· A suitable nanofiller/resin interfacial bonding 
· Preservation of the integrity of  nanoreinforcements during integration process.

As aforementioned, two approaches to integrate the  nanomaterials in the composite structure have been
followed:

· Bulk doping strategy: Dispersion techniques such  as three roll mill, high shear mechanical stirring,
etc. have been studied in order to obtain the best  dispersion of nanofillers into the resin and good
interfacial bonding. Once the resin is doped,laminates have been manufactured by hand layup
and autoclave curing. With this approach the  maximum nanofiller loading level is determined
mainly by the initial viscosity of the resin.

image
Figure 6: Doped resine:30% tungsten and 0,5%CNT.

From the studies performed, it can be observed  that the epoxy resin can be doped with high
percentage of W particles keeping  manufacturability parameters (viscosity around  4000-5000cp). A maximum content of 0,5%
CNT and 30% W can be achieved when  combining both fillers to dope the epoxy resin.

· Buckypaper (BP) strategy: The method for  production of buckypapers has been based on a
multiple-step process that includes dispersion of  CNTs/tugsten nanofillers in a solvent and
filtration processes; ultrasonication, mechanical  stirring and the use of surfactants to obtain a
stable nanofiller suspension before filtering. The  manufactured buckypaper have been integrated
into prepreg lay-up for later curing in autoclave.
Comparing with bulk doping approach, localized  higher nanofiller content can be obtained with
buckypaper.

image

Figure 7: Buckypaper: 6 % MWNT – 94% of Wparticles.

A high CNT loading can be obtained with BP.
These are porous materials; therefore, a good  impregnation with epoxy resin is assured. On the
other hand, high contents of CNT in combination of W nanoparticles can be obtained (50 %
CNT+50 % W). Thanks to the CNT network Wnanoparticles decantation is not produced
In both approaches, doped laminate coupons with  different percentage of nanofillers have been
manufactured with the following stacking sequence  [0, +45, 90, -45,Central layer (doped resin or BP),-45,
90, 45, 0] to be used in subsequent testing activities.
In Figure 8 and in Figure 9, a detail of the  manufactured laminates is presented. Reference
coupons without any nanofiller inclusions have also  been fabricated for reference purposes.

image

Figure 8: Doped resin. TEC 2: 88%W.

 

image

Figure 9: Buckypaper 6%CNT/94%W.
In Table 2 the samples manufactured are detailed:

image

Table 2: Manufactured samples.

G. Atxaga1TECNALIA, Spain, garbine.atxaga@tecnalia.com
J. Marcos2, M. Jurado3, A. Carapelle4, R. Orava5

1 TECNALIA. Transport Unit, Spain, garbine.atxaga@tecnalia.com
2 TECNALIA. Transport Unit, Spain, jesus.marcos@tecnalia.com
3 TECNALIA. Transport Unit, Spain, mariaje.jurado@tecnalia.com
4 CSL, Belgium, a.carapelle@ulg.ac.be
5 Sensor Center, Finland, risto.orava@sence.fi

(TO BE CONTINUED)

About sooteris kyritsis

Job title: (f)PHELLOW OF SOPHIA Profession: RESEARCHER Company: ANTHROOPISMOS Favorite quote: "ITS TIME FOR KOSMOPOLITANS(=HELLINES) TO FLY IN SPACE." Interested in: Activity Partners, Friends Fashion: Classic Humor: Friendly Places lived: EN THE HIGHLANDS OF KOSMOS THROUGH THE DARKNESS OF AMENTHE
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