Solid propellant with integral electrodes, and method
A device may include an electrically-operated propellant or energetic gas-generating material, additively manufactured together with electrodes for producing a reaction in the material. The device may also include a casing that is additively manufactured with the other components. The additive manufacturing may be accomplished by extruding or otherwise depositing raw materials for the different components where desired. The electrodes may be made of a conductive polymer material, for example using an electrically-conductive fill in a polymer.
1. A method of making a gas-producing device, the method comprising:
in a single additive manufacturing process:
forming electrodes; and
forming electrically-controlled solid propellant material in contact with and operatively coupled to the electrodes.
2. The method of claim 1 , wherein the single additive manufacturing process further includes forming a casing around the electrodes and the electrically-controlled solid propellant material.
3. The method of claim 1 , further comprising inserting the electrodes and the electrically-controlled solid propellant material into a pre-formed casing.
4. The method of claim 1 , wherein the forming the electrically-controlled solid propellant material includes forming the electrically-controlled solid propellant materials between adjacent pairs of electrodes.
5. The method of claim 1 ,
wherein the forming the electrodes includes forming multiple adjacent pairs of electrodes; and
wherein the forming the electrically-controlled solid propellant material includes forming the electrically-controlled solid propellant materials between the adjacent pairs of electrodes.
6. The method of claim 1 , wherein the forming the electrodes includes forming multiple plate electrodes with the electrically-controlled solid propellant material between adjacent of the plate electrodes.
7. The method of claim 6 , wherein the plate electrodes are parallel to one another.
8. The method of claim 1 , wherein the forming the electrodes includes forming multiple annular electrodes with the electrically-controlled solid propellant material between adjacent of the annular electrodes.
9. The method of claim 1 ,
wherein the forming the electrodes includes extruding electrically-conductive material; and
wherein the forming the electrically-controlled solid propellant material includes extruding the electrically-controlled solid propellant material.
10. The method of claim 9 , wherein the electrically-conductive material is an electrically-conductive polymer material.
11. The method of claim 10 , wherein the electrically-conductive polymer material includes a conductive material fill, such as conductive fibers and/or conductive powder.
12. The method of claim 10 , wherein the extruding of the electrically-conductive material and the extruding the electrically-controlled solid propellant material includes extruding from separate respective nozzles.
13. The method of claim 1 , wherein the additive manufacturing includes building up the device layer by layer, placing the electrically-controlled solid propellant material and electrically-conductive electrode material for one layer before moving on to a next layer.