Processes for forming exoergic structures with the use of a plasma and for producing dense refractory bodies of arbitrary shape therefrom
First Claim
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1. A method of producing combustion synthesis products which comprises:
- (a) introducing an oxygen-free plasma-forming gas into a plasma spray;
(b) introducing reactive exoergic materials capable of sustaining a combustion synthesis reaction in finely divided particulate form into said plasma spray directed toward, but not impinging on, a substrate;
(c) melting, without chemically reacting, said exoergic materials in the plasma;
(d) impinging said molten reactive exoergic material on said substrate; and
(e) igniting said impinged exoergic materials.
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Abstract
Plasma spraying methods of forming exoergic structures and coatings, as well as exoergic structures produced by such methods, are provided. The methods include the plasma spraying of reactive exoergic materials that are capable of sustaining a combustion synthesis reaction onto a flat substrate or into molds of arbitrary shape and igniting said plasma sprayed materials, either under an inert gas pressure or not, to form refractory materials of varying densities and of varying shapes.
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Citations
23 Claims
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1. A method of producing combustion synthesis products which comprises:
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(a) introducing an oxygen-free plasma-forming gas into a plasma spray; (b) introducing reactive exoergic materials capable of sustaining a combustion synthesis reaction in finely divided particulate form into said plasma spray directed toward, but not impinging on, a substrate; (c) melting, without chemically reacting, said exoergic materials in the plasma; (d) impinging said molten reactive exoergic material on said substrate; and (e) igniting said impinged exoergic materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing dense refractory materials of arbitrary shape which comprises:
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(a) introducing an oxygen-free plasma-forming gas into a plasma spray; (b) introducing reactive exoergic materials capable of sustaining a combustion synthesis reaction in finely divided particulate form into said plasma spray directed toward, but not impinging on, a substrate consisting of molds or flat surfaces of arbitrary shape; (c) melting, without chemically reacting, said exoergic materials in the plasma; (d) impinging said molten reactive exoergic materials on said substrate; and (e) igniting said impinged exoergic materials under a pressure of from about 500 atm to about 4,000 atm. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Current AssigneeUnited States Of America As Represented By The Department Of Energy
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Original AssigneeUnited States Department of Energy (Government of the United States of America)
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InventorsKelly, Michael D., Holt, J. Birch
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Primary Examiner(s)SILVERMAN, STANLEY S
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Application NumberUS07/311,795Time in Patent Office480 DaysField of Search427/34, 427/423, 427/224, 427/377, 427/427, 428/689, 428/697US Class Current428/689CPC Class CodesC23C 4/12 characterised by the method...
