Method for fabricating structural propellants
View Patent ↗A vehicle includes at least one polyoxymethylene structural support member. The polyoxymethylene structural support member includes a polyoxymethylene component that is a propellant that provides thrust to the vehicle upon pyrolysis or combustion of the polyoxymethylene component of the product of pyrolysis of the polyoxymethylene component. The vehicle can be a satellite or other type of spacecraft.
1. A process for fabricating structural composites, comprising the steps of:
a) placing a mold material between plates of a mold, wherein the mold material includes polyoxymethylene and at least one material selected from the group consisting of an oxidant, a structural reinforcement, and an energetic additive; and
b) applying pressure to the mold material to at least partially cure the mold material and thereby form a polyoxymethylene rod.
2. The process of claim 1 , further including the step of heating the mold material before pressurizing the mold material.
3. The process of claim 1 , wherein the structural reinforcement is at least one material selected from the group consisting of a metallic facesheet, a metallic tube, a metallic mesh, a metallic cloth, carbon fiber, carbon cloth, carbon nanotubes, a ceramic, boron fibers and boron cloth.
4. The process of claim 1 , further including the step of machining the cured structural composite.
5. The process of claim 1 , further including the steps of:
(a) machining the polyoxymethylene rod to produce radial slots in the polyoxymethylene rod;
(b) inserting additional structural reinforcement material into the radial slots; and
(c) inserting the polyoxymethylene rod into a cylinder.
6. The process of claim 5 , further including the step of cooling the polyoxymethylene rod before it is inserted into the cylinder.
7. The process of claim 6 , further including the step of heating the cylinder prior to inserting the polyoxymethylene rod into the cylinder.
8. The process of claim 7 , further including the step of heating the polyoxymethylene rod and the cylinder after the polyoxymethylene rod has been inserted into the cylinder thereby further curing the polyoxymethylene rod.
9. The process of claim 5 , wherein a bonding agent is employed to bind the polyoxymethylene rod to the cylinder.
10. The process of claim 1 , wherein at least three plates are used to produce more than one structural composite during a single curing process.
11. The process of claim 10 , wherein the plates are lined with structural support material so that at least a portion of the structural composite is defined by the structural support material that lined the plates.