Amorphous boron-carbon alloy in bulk form and methods of making the same
AssigneeUnited Technologies Corporation
InventorsFrancis S. Galasso, Roy Fanti, Richard D. Veltri
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Abstract
Processes of forming amorphous boron-carbon alloy in bulk form without crystallization are disclosed. Such products can be produced in thicknesses well in excess of ten mils by employing Reynolds number gas reactant flow conditions of 40 to 120. The resultant products of such processes having grain sizes preferably less than 30 A are also disclosed.
Claims22
A process of forming amorphous boron-carbon alloy in bulk form comprising:
- subjecting a releasable mold reaction surface to a gaseous mixture of at least one boron-containing gas, at least one carbon-containing gas, and a reducing gas, at temperatures of 950.degree. C. to 1300.degree. C., and Reynolds Number flow condition of 40-120, until an amorphous boron-carbon alloy structure at least 40 mils thick is deposited on the mold reaction surface, and removing the formed structure from the mold reaction surface.
A process of forming amorphous boron-carbon alloy in bulk form comprising:
- subjecting a releasable mold reaction surface to a gaseous mixture comprising CH.sub.a X.sub.b wherein a+b=4 and X is selected from the group consisting of F, Cl, Br or I or combinations thereof, BX.sub.3 where X is defined as above, and a reducing gas, at temperatures of 950.degree. C. to 1300.degree. C., and Reynolds number flow condition of 40 to 120, until a structure at least 40 mils thick is deposited on the mold reaction surface, and removing the formed structure from the mold reaction surface.
A process of forming amorphous boron-carbon alloy in bulk form comprising:
- subjecting a releasable glass mold reaction surface to a gaseous mixture of CH.sub.4, BCl.sub.3 and H.sub.2 with a CH.sub.4 /BCl.sub.3 ratio of 0.5/1 to 6.0/1, a CH.sub.4 /(CH.sub.4 +BCl.sub.3) ratio of 0.3/1 to 0.9/1, a CH.sub.4 /(CH.sub.4 +BCl.sub.3 +H.sub.2) ratio of 0.15/1 to 0.5/1, at temperatures of 1120.degree.-1170.degree. C. and a Reynolds number flow condition of 60 to 100, producing a structure at least 40 mils thick and having a grain size less than 3 A, and removing the formed structure from the mold surface.
The process of claim 19 wherein the grain size is less than 15 A.
An amorphous, free-standing, hard, thick boron-carbon alloy structure at least 40 mils thick having a high modulus of elasticity, a grain size less than 30 A, no sharp discernible X-ray diffraction pattern, a smooth surface, isotropic expansion and no grain boundaries.
Dependencies are inferred from the claim text.