Porous titanium coating atmospheric plasma spraying gas protecting apparatus and its spraying method

[0036] Example one

[0037] Connect and fix the base 1 of the inert gas protection device with the nozzle on the conventional atmospheric plasma spraying equipment, soak 50% of the titanium powder with a particle size of 40 microns and 50% of the titanium powder with a particle size of 200 microns in alcohol, and then use Ultrasonic mixing for 30 minutes, after drying at room temperature, use argon gas to feed the titanium powder into the powder transfer interface tube 7 on the gas protection device, and use the inert gas protection cover formed by this device. Under the action of the inert gas protection cover, use the following optimization Spraying titanium powder on the titanium substrate to obtain the biomedical porous titanium coating. The specific spraying process parameters used in this embodiment are shown in Table 1 of Spraying Parameters. The XRD analysis of the coating obtained under the spraying process parameters, the results are shown in Figure 4 , The results show that the coating is composed of titanium, the coating is not oxidized, and no titanium oxide is generated; scanning electron microscopy analysis of the coating confirms that the coating is composed of micron-sized titanium metal particles with a porous structure with a porosity of about 30%. Figure 5.

[0038] Plasma working gas (argon and hydrogen mixed gas): argon 50 standard liters/minute hydrogen 3 standard liters/minute

[0039] Example two

[0040] Connect and fix the base 1 of the inert gas protection device with the nozzle on the atmospheric plasma spraying equipment, soak 80% of the 20-micron and 20% of the 250-micron titanium powder in alcohol, and then mix with ultrasonic for 30 minutes in the atmosphere. After drying, use argon gas to feed the titanium powder into the powder conveying interface tube 7 on the gas protection device, and use the inert gas protection cover formed by this device. Under the action of the inert gas protection cover, use the following optimized spraying process parameters to spray the titanium powder Spray on the titanium substrate to obtain the biomedical porous titanium coating. The specific spraying process parameters used in this embodiment are shown in Table 2 of Spraying Parameters. The XRD analysis results show that the coating is composed of titanium, the coating is not oxidized, and no titanium oxide is generated. The scanning electron microscope analysis of the coating confirms that the coating is composed of micron-sized titanium metal particles with a porous structure, and the porosity is about 20%.

[0041] Plasma working gas (argon): argon 30 standard liters/minute hydrogen 0 standard liters/minute

[0042] Embodiment 3: Connect and fix the base 1 of the inert gas protection device with the nozzle on the atmospheric plasma spraying equipment, soak 20% of 40 micron and 80% of 100 micron titanium powder in alcohol, and then mix with ultrasonic 30 Minutes, after doing what in the atmosphere, use argon to send the titanium powder into the powder delivery interface tube 7 on the gas protection device, use the inert gas protection cover formed by this device, and use the following optimized spraying under the action of the inert gas protection cover Process parameters: The titanium powder is sprayed on the titanium substrate to obtain the biomedical porous titanium coating. The specific spraying process parameters used in this embodiment are shown in Table 3 of Spraying Parameters. The XRD analysis results of the coating obtained under the spraying process parameters show that the coating is composed of titanium, the coating has not been oxidized, and no titanium oxide is formed. The scanning electron microscope analysis of the coating confirmed that the coating is composed of micron-sized titanium metal particles with a porous structure. The porosity is about 50%.

[0043] Plasma working gas (argon and hydrogen mixed gas): argon 50 standard liters/minute hydrogen 3 standard liters/minute