Method for manufacturing nanopowders of oxide through DC plasma thermal reaction
First Claim
1. A method for manufacturing oxide nanopowders, comprising the following steps:
- providing a non-transferred DC plasma apparatus equipped with one to three sets of non-transferred electrodes, a plasma-convergence section and a nozzle for spraying out plasma;
generating a plasma in the plasma-convergence section by introducing a direct current to the non-transferred electrodes in the presence of the plasma-forming gas;
introducing a solid precursor to the plasma-convergence section continuously, wherein the solid precursor is vaporized and oxidized before being sprayed out with the plasma jet; and
obtaining nanopowders by blowing the plasma jet containing the vaporized and oxidized precursor through a vortical cooling-gas.
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Abstract
A method for manufacturing powders of oxides in a nanometer level through a direct current plasma thermal reaction is disclosed. The energy required is provided by the plasma that is generated in the non-transferred DC plasma apparatus. Once the solid precursors are introduced into the plasma, the solid precursors are vaporized and oxidized in the plasma reaction region of the non-transferred DC plasma apparatus continuously. Then, the oxide powders in a nanometer scale can form homogeneously and continuously. By controlling the nozzle size, the speed of the plasma can be adjusted and the coarsening and agglomeration of the nanopowders can be effectively prevented. Finally, oxide nanopowders of high-purity and high-dispersity are obtained by cooling down the plasma gas containing the vaporized and oxidized precursor through a vortical cooling-gas.
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Citations
13 Claims
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1. A method for manufacturing oxide nanopowders, comprising the following steps:
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providing a non-transferred DC plasma apparatus equipped with one to three sets of non-transferred electrodes, a plasma-convergence section and a nozzle for spraying out plasma; generating a plasma in the plasma-convergence section by introducing a direct current to the non-transferred electrodes in the presence of the plasma-forming gas; introducing a solid precursor to the plasma-convergence section continuously, wherein the solid precursor is vaporized and oxidized before being sprayed out with the plasma jet; and obtaining nanopowders by blowing the plasma jet containing the vaporized and oxidized precursor through a vortical cooling-gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification