Magnetic rotating arc cathode center powder feeding plasma metallurgical melting spraying process
An arc cathode and plasma technology, which is applied in metal material coating process, melting spray plating, coating and other directions, can solve the problems of large arc cathode and anode structure and difficulty in handling small space.
Pending Publication Date: 2022-07-12
四川真火等离子研究院有限公司
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Problems solved by technology
However, with the above method, the entire arc cathode and anode structure is relatively large, making it extremely difficult to deal with a small space
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Embodiment 1
[0026] The present embodiment provides a powder-feeding plasma metallurgical melt-spraying process for the center of the magnetic rotating arc cathode, including:
[0027] The usual arc is composed of a tapered cathode and a cylindrical anode. The gas discharge between the cathode and the anode forms a plasma, and the conductivity of the plasma is much greater than that of the gas, so a plasma sheath is formed on the surface of the pointed cone of the cathode. Floor. The thickness of the plasma sheath is generally about 10λ D , where λ D is the Debye radius of the plasma. The electron density of arc magnetized plasma is about 10 18 m -3 , the electron temperature is about 10 eV, the Debye radius of the plasma:
[0028]
[0029] Therefore, the thickness of the sheath is about 235um. The voltage applied to the cathode and anode of the arc is about 100V, and the electric field strength between the sheaths is about E=V / H=100 / (2.35×10 -4 )=4.3×10 5 (V / m), the electric fi...
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Abstract
The invention belongs to the technical field of metal spraying, and provides a magnetic rotating arc cathode center powder feeding plasma metallurgical melting spraying process, which adopts a single cathode mode of cathode center powder feeding, and metal powder and gas enter a discharge channel of an anode through a center channel of the cathode; a heat insulation jacket is sleeved outside the anode, and a steady-state longitudinal magnetic field is arranged in the discharge channel; in the electric arc spraying process, the temperature of the inner wall of the anode is 1650-1700 DEG C; and the plated metal substrate is at 10-1000 Pa, and forward voltage is applied between the plated metal substrate and the anode, so that the speed of the metal charged liquid drops is 2000-2500 m / s. Through the process provided by the invention, the material layer with the metal surface sectional area being about the liquid drop sectional area and the depth being about 10 microns can be instantaneously melted to form metallurgical melting combination with the sprayed metal powder liquid drops. The tensile strength of the formed metallurgical molten coating can reach 600MPa, and is far higher than that of a mechanical occlusion coating formed by a common plasma spraying process.
Description
technical field [0001] The invention belongs to the technical field of metal spraying, and in particular relates to a powder-feeding plasma metallurgical melting spraying process in the center of a magnetic rotating arc cathode. Background technique [0002] In some industrial applications, it is necessary to spray titanium alloy material on the surface of some base metal materials to improve the corrosion resistance and high temperature resistance of the base material. [0003] Commonly used coating methods include electroplating, plasma spraying, etc. However, with electrochemical electroplating, hydrogen is inevitably introduced into the coating. At high temperature, hydrogen escapes from the titanium metal lattice to form hydrogen molecules, and its volume increases dozens of times, which is easy to cause bubbling and cracks on the surface of the titanium alloy, thereby damaging the performance of the titanium alloy coating; plasma spraying the titanium alloy To the su...
Claims
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IPC IPC(8): C23C4/131C23C4/06
CPCC23C4/131C23C4/06
Inventor 赵华马太华施可敏曾毅李林李本南
Owner 四川真火等离子研究院有限公司