The surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma.

Abstract

OCR 09WP 24 / 03 / 2569 The surface treatment process of titanium alloys using plasma nitriding with bipolar pulses. Plasma cleaning involves washing the titanium alloy workpiece and then removing any remaining impurities. And the oxide layer on the surface of the titanium alloy workpiece is formed using a hydrogen and argon gas plasma, followed by heating. The workpiece is heated using a hydrogen and argon gas plasma, powered by a bipolar pulsed power supply, and then proceeds to the next step. Surface treatment by plasma nitriding involves feeding nitrogen and hydrogen gases onto an alloy workpiece. Titanium is treated using a bipolar pulsed power supply. When the plasma nitriding time is complete, stop the power supply. Gas and electricity are introduced into a vacuum vessel, and the titanium alloy workpiece is cooled.

Claims

OCR 09WP 24 / 03 / 2569 1. Surface treatment process of titanium alloys using plasma nitriding with bipolar pulses. Asymmetrical, consisting of sample preparation and surface treatment using plasma nitriding. By using bipolar pulsed plasma, which has the following characteristics: a) Clean the titanium alloy workpiece in preparation for surface treatment. b) Remove any remaining impurities and oxide layers on the surface of the titanium alloy workpiece using plasma. (Plasma cleaning) By placing the titanium alloy workpiece, which has been cleaned in step a), onto... The electrodes serve as a base for the workpiece inside a vacuum chamber, using an electrical power of 500-600 watts. Watts, frequency 50-60 kHz, voltage -750-800 volts, and current 1.7-1.8 amperes, with gas feed. Hydrogen and argon gas are entered into a vacuum container, and the pressure is controlled to be between 0.2-0.3 Torrr. 20-30 minutes c) Preheat the titanium alloy workpiece that has passed step b) by feeding hydrogen gas. Argon gas is then introduced into a vacuum vessel, and the pressure is controlled between 3.0-4.0 tors using a power supply. Asymmetrical bipolar pulses with a frequency not exceeding 0-250 kHz at a voltage of -350-450 volts, and A power output of 800-1,100 watts is required to generate hydrogen and argon gas plasma, with a current of 2.0-3.0 amperes. After 45-50 minutes, stop supplying argon gas into the vacuum container. d) Surface treatment using plasma nitriding for preheated workpieces. From step c), by feeding nitrogen and hydrogen gases, the pressure during plasma nitriding is between 6.0- 6.5 Tornado, using an asymmetrical bipolar pulsed power supply, controls the current to 1.8 amperes. Power rating 840-940 watts, frequency 25-200 kHz, voltage -480-500 volts, and temperature 640°C. 660 degrees Celsius for 240 minutes. c) When the plasma nitriding process is complete according to the procedure, d) stop the gas supply and stop. Power is applied to electrodes in a vacuum container, and the titanium alloy workpiece is then cooled until... The temperature is between 25-35 degrees Celsius.

2. Surface treatment process of titanium alloys using plasma nitriding with bipolar plasma pulses. Under Claim 1, where Procedure (a) provides for cleaning of titanium alloy workpieces by vibratory washing in Soak in acetone solution for 10-20 minutes, then rinse with shaking in methanol for 10-20 minutes, and then wash again. By vibrating in deionized water for 10-20 minutes, respectively.

3. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, whereby Procedure b) the flow rates of hydrogen and argon gas are provided as 500 to 500. Standard cubic centimeters per minute (sccm) 4. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, where step b) the workpiece bed temperature increases and is between 350-400 degrees. Celsius, after the process of removing any remaining impurities and oxide layers from the surface of the metal alloy workpiece. Titanium using plasma.

5. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, whereby Procedure C) the flow rate of hydrogen and argon gases is provided to be equal to 500. standard cubic centimeters per minute 6. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, whereby in step c) the operating temperature is raised to between 600-700 degrees Celsius.

7. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, whereby Procedure d) the flow rates of nitrogen and hydrogen gases are provided as 1,000 per 500 cubic centimeters per minute (standard) 8. Surface treatment process of titanium alloys by plasma nitriding using bipolar pulsed plasma. Under Claim 1, whereby step (e) the titanium alloy workpiece is cooled under vacuum conditions.