Plasma jet body model heating modification device for microwave pulse resonance discharging

Abstract

The invention relates to the technical field of plasma jet body model heating modification for microwave pulse resonance discharging,in particular to a plasma jet body model heating modification device for microwave pulse resonance discharging. The device includes a pulse modulator,a power amplifier,a signal generator,an oscilloscope,a crossed quartz tube coaxial resonance discharging device,a coaxial line and a directional coupler. A signal is generated by the signal generator,a pulse frequency value of the pulse modulator is set,and meanwhile the power amplifier is adjusted to maintain output at specific power and render the temperature adjustable; additionally,generated microwaves cause aerial discharging under the action of pulse resonance,and therefore high-speed high-temperature jetflow is formed. Different kinds of coating powder or reaction gas can be added through crossed quartz tubes and then heated and accelerated by the jet flow after entering the thermal plasma jet flow and finally hit the surface of a base material to form a coating. Microwave field body models with large size distribute exciting gas for discharging,and therefore an overall plasma area is triggered to carry out discharging of the body models at the same time,so that heating is more uniform.

Description

technical field [0001] The invention relates to the technical field of microwave pulse resonance discharge plasma jet fluid film heating modification technology, in particular to a microwave pulse resonance discharge plasma jet fluid film heating modification device. Background technique [0002] Plasma is a quasi-neutral system composed of a large number of charged positive, negative and neutral particles. It is a fourth state of matter other than solid, liquid and gas produced under high temperature or other specific excitation conditions. As the fourth state of matter, plasma has high temperature, high particle kinetic energy, and extremely active chemical properties. These unique physical and chemical properties make it have performance and technical advantages in many fields. Plasma jet heating technology is developed by using high temperature, high speed plasma jet and its chemical effects. Because plasma heating technology has the characteristics of concentrated ener...

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Problems solved by technology

[0003] Chinese Patent "Arc Heated Plasma Spray Gun" Application No.: 201510334998.3, Authorized Publication No.: CN104902665A, Authorized Publication Date: 2015.09.09 A new type of arc heated plasma torch is disclosed, which simplifies the water cooling system of the arc heated plasma torch , its working principle is a direct current arc between the cathode and anode, which produces a high-temperature and high-speed plasma jet, but there are still defects such as electrode ablation, troublesome replacement and high cost.

However, the equipment is relatively complicated, the cost of one-time investment is relatively high, the interchangeability and adaptability of the induction coil of the electromagnetic induction component are poor, and it is not suitable for application on some workpieces with complex shapes.

[0005] Chinese Patent "Laser Heating Device and Laser Heating System" Application No.: CN201610533778.8, Authorized Publication No.: CN106098596A, Authorized Publication Date: 2016.11.09 A laser heating device is disclosed. Due to the technical problem of limited power adjustment, the heating of the sample point of the combined material chip sample is realized step by step each time

However, the laser heating area is small, and the laser will damage people's eyes and skin. High-power lasers will damage equipment and even cause fires, so precautions must be taken

In addition, the laser equipment is expensive, and the low electro-optical energy conversion efficiency is generally only about 1%, and the high-power carbon dioxide gas laser is only less than 10% to 15%.

[0006] Therefore, it is particularly important to study a device that integrates large-volume uniform heating of plasma, low input cost, and surface modification in a high-clean environment. At present, several devices have been developed, but their functions are single and their scope of application is narrow. , the treatment effect is not obvious, or the price is expensive, but it has not been well used by people

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