1. Salt bath nitrocarburizing (TUFFTRIDE QPQ) technology TUFFTRIDE Q process is to nitrocarburize the parts in alkaline hydrogen bath after simple pre-cleaning and preheating in the air to 350-450°C. The treatment temperature is usually 580°C, generally 60-120 minutes, and the temperature can be lowered or increased under special circumstances. The cooling is performed using an oxidizing type cooling bath at a temperature in the range of 350 to 400°C, and then the hot water is used to clean the workpiece. Oxidation cooling, in addition to the slow cooling rate, is beneficial to the dimensional stability of the part, but also has other benefits: 1 significantly improve corrosion resistance; 2 the surface of the part in the alkali hydrogenate bath produces an oxide film; 3 get better sliding performance.
After the oxidation treatment, the part can be polished (TUFFTRIDE QP) or polished and then processed in the oxidation bath (TUFFTRIDE QPQ). In the subsequent oxidation process, the roughness of the polished surface does not change.
2. Ion Precipitation Diamond Film Technology <br> A layer of diamond-like carbon film is deposited on the finished tool surface or a layer of diamond film is deposited on other substrates and then welded to the surface of the tool. The principle of preparing a diamond film is to firstly prepare an ionic carbon, which is then recrystallized on the surface of the workpiece. Due to the presence of amorphous carbon and graphite, diamond-like films are actually obtained in most cases.
3. Thermal Spraying Technology <br> Thermal spraying is the use of a heat source to heat or soften the sprayed material, relying on the power of the heat source or an external gas flow to atomize or push the melted droplets into a jetted pellet, at a certain speed. A process of spraying a coating on the surface of a substrate.
In the spraying process or after the coating is formed, the metal substrate and the coating are heated to melt the coating on the surface of the substrate, and the substrate is diffused or melted to form a metallurgical bonding layer with the substrate, which is called thermal spraying. melt.
The advantages of thermal spraying: various methods, extensive coating, unlimited workpieces, and simple process.
Thermal spray types: flame spray, arc spray, plasma spray.
1) Flame Spray 1 Normal flame spraying: Using oxy-fuel gas as a heat source, the sprayed material is heated to a molten or semi-molten state and sprayed on the surface of the pretreated substrate with a high velocity airstream to form a coating with the desired properties.
2 Explosion spraying: The county will send a certain proportion of oxygen and acetylene gas into the spray gun, and then another mixture of the other spray powder from the other entrance will be fed into the gun. The gun will be filled with a certain amount of mixed gas and powder. There is an electric spark plug. Ignition causes the oxygen-acetylene mixture to explode, generating heat and pressure waves. The sprayed powder is heated while it is accelerating, hitting the surface of the workpiece and forming a dense coating.
3 Supersonic flame spraying: using a special flame spray gun to obtain high temperature, high-speed flame flow is used to spray tungsten carbide and other refractory materials and get excellent performance of the spray coating.
2) Arc Spraying Technology 1 Ordinary arc spraying: A process in which an arc is used as a heat source to atomize a molten metal wire with a high-speed air stream and spray it onto the surface of a workpiece at a high speed to form a coating. Its characteristics: excellent coating performance, high efficiency, energy saving, safe use.
2 Supersonic arc spraying: It is a newly developed surface treatment technology based on the common arc spraying technology by improving the arc spray gun and power supply. He not only has the main characteristics of ordinary arc spraying technology, but also because it increases the spraying speed, reach and exceed the speed of sound, so that the quality of the coating is significantly improved, the bonding strength is significantly improved, the porosity is greatly reduced, in the surface protection against wear and corrosion, The field of surface treatment is obviously superior to the application prospect of ordinary arc spraying.
3) Plasma spraying Thermal spraying with plasma arc as heat source. Its characteristics: no deformation of parts, coating types, and process stability.
4. Laser surface modification technology 1) Laser transformation hardening: The surface temperature of the iron-carbon alloy material is quickly heated and austenitized by laser irradiation, while the matrix remains cool; after the beam is removed, the austenite region is on the substrate. The rapid cooling, quenching, martensite, to achieve the purpose of surface hardening.
2) Laser consolidation hardening (laser grain refinement): The use of higher laser energy than in the case of transformation hardening causes the metal surface to rapidly melt and cause a large temperature gradient between the molten metal and the base metal. After the laser is removed, the molten metal rapidly solidifies, and the surface obtains an ultra-fine or ultra-fine microstructure. The segregation of the surface components is reduced, and surface defects and micro-cracks can be fused. Laser fusion can form deeper hardened layers.
5. Electroless plating technology <br> In the absence of electricity, direct metal or non-metallic workpiece immersed in chemical deposition liquid below 100 °C, through the catalytic oxidation and reduction reflected in the workpiece surface deposited amorphous alloy New technologies.
6. Functionally Gradient Material (FGM) Technology <br> A new material with a gradient change in the microscopic composition and performance of the material as a function of the position of the material. That is, the two mutually incompatible materials are merged into one body through a gradient transition.
Its preparation methods mainly include: deposition method, spraying method, sintering method, self-propagating high-temperature synthesis method, infiltration method and the like.
After the oxidation treatment, the part can be polished (TUFFTRIDE QP) or polished and then processed in the oxidation bath (TUFFTRIDE QPQ). In the subsequent oxidation process, the roughness of the polished surface does not change.
2. Ion Precipitation Diamond Film Technology <br> A layer of diamond-like carbon film is deposited on the finished tool surface or a layer of diamond film is deposited on other substrates and then welded to the surface of the tool. The principle of preparing a diamond film is to firstly prepare an ionic carbon, which is then recrystallized on the surface of the workpiece. Due to the presence of amorphous carbon and graphite, diamond-like films are actually obtained in most cases.
3. Thermal Spraying Technology <br> Thermal spraying is the use of a heat source to heat or soften the sprayed material, relying on the power of the heat source or an external gas flow to atomize or push the melted droplets into a jetted pellet, at a certain speed. A process of spraying a coating on the surface of a substrate.
In the spraying process or after the coating is formed, the metal substrate and the coating are heated to melt the coating on the surface of the substrate, and the substrate is diffused or melted to form a metallurgical bonding layer with the substrate, which is called thermal spraying. melt.
The advantages of thermal spraying: various methods, extensive coating, unlimited workpieces, and simple process.
Thermal spray types: flame spray, arc spray, plasma spray.
1) Flame Spray 1 Normal flame spraying: Using oxy-fuel gas as a heat source, the sprayed material is heated to a molten or semi-molten state and sprayed on the surface of the pretreated substrate with a high velocity airstream to form a coating with the desired properties.
2 Explosion spraying: The county will send a certain proportion of oxygen and acetylene gas into the spray gun, and then another mixture of the other spray powder from the other entrance will be fed into the gun. The gun will be filled with a certain amount of mixed gas and powder. There is an electric spark plug. Ignition causes the oxygen-acetylene mixture to explode, generating heat and pressure waves. The sprayed powder is heated while it is accelerating, hitting the surface of the workpiece and forming a dense coating.
3 Supersonic flame spraying: using a special flame spray gun to obtain high temperature, high-speed flame flow is used to spray tungsten carbide and other refractory materials and get excellent performance of the spray coating.
2) Arc Spraying Technology 1 Ordinary arc spraying: A process in which an arc is used as a heat source to atomize a molten metal wire with a high-speed air stream and spray it onto the surface of a workpiece at a high speed to form a coating. Its characteristics: excellent coating performance, high efficiency, energy saving, safe use.
2 Supersonic arc spraying: It is a newly developed surface treatment technology based on the common arc spraying technology by improving the arc spray gun and power supply. He not only has the main characteristics of ordinary arc spraying technology, but also because it increases the spraying speed, reach and exceed the speed of sound, so that the quality of the coating is significantly improved, the bonding strength is significantly improved, the porosity is greatly reduced, in the surface protection against wear and corrosion, The field of surface treatment is obviously superior to the application prospect of ordinary arc spraying.
3) Plasma spraying Thermal spraying with plasma arc as heat source. Its characteristics: no deformation of parts, coating types, and process stability.
4. Laser surface modification technology 1) Laser transformation hardening: The surface temperature of the iron-carbon alloy material is quickly heated and austenitized by laser irradiation, while the matrix remains cool; after the beam is removed, the austenite region is on the substrate. The rapid cooling, quenching, martensite, to achieve the purpose of surface hardening.
2) Laser consolidation hardening (laser grain refinement): The use of higher laser energy than in the case of transformation hardening causes the metal surface to rapidly melt and cause a large temperature gradient between the molten metal and the base metal. After the laser is removed, the molten metal rapidly solidifies, and the surface obtains an ultra-fine or ultra-fine microstructure. The segregation of the surface components is reduced, and surface defects and micro-cracks can be fused. Laser fusion can form deeper hardened layers.
5. Electroless plating technology <br> In the absence of electricity, direct metal or non-metallic workpiece immersed in chemical deposition liquid below 100 °C, through the catalytic oxidation and reduction reflected in the workpiece surface deposited amorphous alloy New technologies.
6. Functionally Gradient Material (FGM) Technology <br> A new material with a gradient change in the microscopic composition and performance of the material as a function of the position of the material. That is, the two mutually incompatible materials are merged into one body through a gradient transition.
Its preparation methods mainly include: deposition method, spraying method, sintering method, self-propagating high-temperature synthesis method, infiltration method and the like.
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