SIntering carbon, as well as welding it, is never possible. The melting point, if it really exists (it is still debated), is far too high. Carbon slightly evaporates instead (typically above 4000°C). Sintering usually occurs at 2/3 of the melting point, so if the melting point is excessively high or doesn't exist, sintering is just impossible.
Alain
It depends on the nature of the composite. In principle, the specific problems are not visible.
Of course, scares by impossibility of graphite joining is trolling :-) Catalysts for graphite are known for long time and are used in production of carbon nanotubes below 1500oC, for instance ( Fe, Co, Ni) .
For more specific application like graphene, some fine method was developed:
Theory : http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1683&context=infopapers
Practice :
A method for joining individual graphene sheets http://www.sciencedirect.com/science/article/pii/S0008622312005374 http://www.ingentaconnect.com/content/asp/jnn/2014/00000014/00000008/art00016
Graphite materials joining can be made by more classical methods, like titanium carbide brazing (by use of Ti powder) http://www.s-bond.com/solutions-and-service/applications/carbon-carbide-graphite-bonding/
Your composite components may also be used for sintering.
Sintering of graphene composite is possible but it totally depends upon the type of composite. Please see the attached research article.
I hope this will help you.
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