Tubular structures with coated interior surfaces
AssigneeSouthwest Research Institute
InventorsRonghua Wei, Chistopher Rincon, James Arps
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Abstract
Tubular structures having aspect ratios of at least about 3 and comprising interior surfaces comprising substantially uniform coatings generated from a gaseous precursor material.
Claims27
A tubular structure comprising:
- a hollowed tubular structure having an aspect ratio of about 3 or more and comprising a first interior surface;
- the first interior surface comprising an interior coating formed thereon, said interior coating defining a second interior surface of the tubular structure, said interior coating comprising a gaseous deposition product comprising a substantially uniform amorphous carbon coating comprising a thickness of about 5 micrometers or more, wherein said amorphous carbon coating comprises a hydrogen concentration of about 32%.
A tubular structure having an aspect ratio of about 6 or more and comprising an interior surface, said interior surface comprising a gaseous deposition product comprising a substantially uniform amorphous carbon coating having a thickness of about 2 micrometers or more, wherein said interior surface comprises one or more metal and a sequential gradient comprising:
- silicon chemically bonded to said metal, forming a metal-silicide;
- silicon cohesively bonded to said metal-silicide;
- carbon chemically bonded to said silicon, forming silicon-carbide;
- and
- carbon cohesively bonded to said silicon-carbide forming said substantially uniform amorphous carbon coating.
A tubular structure having an aspect ratio of about 6 or more and comprising an interior surface, said interior surface comprising a gaseous deposition product comprising a substantially uniform amorphous carbon coating having a coating thickness of about 2 micrometers or more and comprising a uniformity of about +/−20% or less along its length, wherein said interior surface comprises one or more metal and a sequential gradient comprising:
- silicon chemically bonded to said metal, forming a metal-silicide;
- silicon cohesively bonded to said metal-silicide;
- carbon chemically bonded to said silicon, forming silicon-carbide;
- and
- carbon cohesively bonded to said silicon-carbide forming said substantially uniform amorphous carbon coating.
A tubular structure having an aspect ratio of about 6 or more and comprising an interior surface, said interior surface comprising a gaseous deposition product comprising a substantially uniform amorphous carbon coating having a thickness of about 0.5 micrometers or more and comprising a nanohardness of about 15 GPa measured using a nano-indentation hardness tester, wherein said interior surface comprises one or more metal and a sequential gradient comprising:
- silicon chemically bonded to said metal, forming a metal-silicide;
- silicon cohesively bonded to said metal-silicide;
- carbon chemically bonded to said silicon, forming silicon-carbide;
- and
- carbon cohesively bonded to said silicon-carbide forming said substantially uniform amorphous carbon coating.
A tubular structure having an aspect ratio of about 6 or more and comprising an interior surface, said interior surface comprising a gaseous deposition product comprising a substantially uniform amorphous carbon coating having a thickness of about 2 micrometers or more, wherein said interior surface composes one or more metal and a sequential gradient comprising:
- germanium chemically bonded to said metal, forming a metal-germanide;
- germanium cohesively bonded to said metal-germanide;
- carbon chemically bonded to said germanium, forming germanium-carbide;
- and
- carbon cohesively bonded to said germanium-carbide forming said substantially uniform amorphous carbon coating.
Dependencies are inferred from the claim text.