Inner coating layer for solid-propellant rocket engines
AssigneeAVIO S.p.A.
InventorsDaniele SCHIARITI, Paolo BELLOMI
Life of this patent
Estimating the term…
Abstract
An inner coating layer for solid-propellant rocket engines, constituted by a material comprising from 45% to 55% wt. of a a cross-linkable, unsaturated-chain polymer base, from 11% to 13% wt. of silica, from 15% to 25% wt. of vulcanizing agents and plasticizers, from 5% to 7% wt. of aramid fiber and from 10% to 15% wt. of microspheres made of a material selected among glass, quartz and nano clay, having diameter lower than 200 gm, density comprised between 0.30 and 0.34 g/cc and resistance to hydrostatic pressure greater than, or equal to, 4500 psi.
Claims11
An inner coating layer for solid-propellant rocket engines, the inner coating comprising:
- an ablative material comprising from 45% to 55% wt. of a cross-linkable, unsaturated-chain polymer base, from 11% to 13% wt. of silica and from 15% to 25% wt. of vulcanizing agents and plasticizers, the ablative material further comprising from 5% to 7% wt. of aramid fiber and from 10% to 15% wt. of micro-spheres made of a material selected among glass, quartz and nano clay, the micro-spheres having a diameter lower than 200 um, the micro-spheres having a density comprised between 0.30 and 0.34 g/cc and the micro-spheres having a resistance to hydrostatic pressure greater than or equal to 4500 psi.
Dependencies are inferred from the claim text.