Thermal Spray

Thermal spraying refers to a series of processes in which finely dispersed metal or non-metallic coating materials are deposited in a molten or semi-molten state onto a surface of a prepared substrate to form a spray coating. Layer. It is using some kind of heat source.

Definition Thermal spraying refers to a series of processes in which a finely dispersed metal or non-metallic coating material is deposited in a molten or semi-molten state onto a surface of a prepared substrate to form a spray coating. Sedimentary layer. It uses a heat source (such as electric arc, plasma spray or combustion flame, etc.) to heat a powdery or filamentous metal or non-metal material to a molten or semi-molten state, and then to retain itself or compressed air by means of a flame. A technique in which a velocity is sprayed onto the surface of a pretreated substrate to deposit a surface coating having various functions.
Introduction 1. Thermal spraying is a surface strengthening technology and an important part of surface engineering technology. It has always been a new technology project promoted in China. It uses a certain heat source (such as arc, plasma spray or combustion flame) to powder. The metal or non-metal material in the form of filaments or filaments is heated to a molten or semi-molten state, and then sprayed to the surface of the pretreated substrate at a certain speed by means of flame leaving itself or compressed air, and deposited to form a surface coating having various functions. A technology.

2. Thermal spraying principle: Thermal spraying refers to a series of processes in which finely dispersed metal or non-metallic coating materials are deposited in a molten or semi-molten state onto a prepared substrate surface. Forming a certain spray deposit. The coating material may be in the form of powder, ribbon, filament or rod. The thermal spray gun provides the necessary heat from the fuel gas, arc or plasma arc, heats the thermal spray material to a plastic or molten state, and is then subjected to the acceleration of the compressed air, causing the constrained particle beam to impinge on the surface of the substrate. The particles impinging on the surface are deformed by stamping to form a laminated sheet which adheres to the surface of the prepared substrate, and then cools and accumulates, eventually forming a layered coating. The coating can achieve high temperature corrosion resistance, wear resistance, heat insulation, and electromagnetic wave resistance due to different coating materials.

3. Definition: Thermal spraying refers to the spraying device that provides different heat sources by using oxygen-acetylene flame, arc, plasma arc, explosion wave, etc., to generate high temperature and high pressure flame flow or supersonic flame flow, and the materials to be coated are various. Metal, ceramic, metal-ceramic composite materials, solid-state spray materials of various plastic powders, instantly heated to a plastic or molten state, and sprayed at high speed onto a surface of a pretreated (clean and rough) component surface to form a coating processing method. We call the special working surface “coating” and the working method of making the coating “thermal spraying”. It is a general term for spraying and spray welding with various heat sources.

4. Use: This atomizes into fine droplets or high-temperature particles under the action of high-speed airflow, and sprays it onto the surface of the treated workpiece at a high flying speed to form a firm coating layer, so that the surface of the workpiece can obtain different hardness. Abrasion resistance, corrosion resistance, heat resistance, oxidation resistance, heat insulation, insulation, electrical conductivity, sealing, disinfection, anti-microwave radiation and various other special physical and chemical properties. It can repair the old and waste in the maintenance of equipment, so that the scrapped parts can be "revived"; it can also be strengthened and pre-protected in the manufacture of new products, so that it can "life longevity".

5, thermal spray material: spray powder plays an important role in the entire thermal spray material. The thermal spray alloy powder includes nickel-based, iron-based and cobalt-based alloy powders, which are applied to the repair and protection of mechanical parts according to different coating hardness.
Features of thermal spraying technology 1. The base material is not limited, it can be metal and non-metal, and can be sprayed on various base materials;

2, sprayable coating materials are extremely extensive, thermal spray technology can be used to spray almost all solid engineering materials, such as cemented carbide, ceramics, metals, graphite, etc.;

3. The temperature rise of the base material during spraying is small, and no stress or deformation occurs;

4. The operation process is flexible and convenient, and is not restricted by the shape of the workpiece, and the construction is convenient;

5, the thickness of the coating can be from 0.01 to a few millimeters;

6, a variety of coating properties, can form wear-resistant, corrosion-resistant, heat-insulating, anti-oxidation, insulation, electrical, anti-radiation and other coatings with various special functions;

7. Advantages such as strong adaptability and good economic returns.
Commonly used thermal spraying methods: flame spraying, oxygen flame powder spraying, oxygen flame wire spraying, oxygen flame spraying, high speed flame spraying (HOVF), arc spraying, plasma spraying, atmospheric plasma spraying, low pressure plasma spraying

1. All kinds of cement machinery shaft, hole, plane, and special-shaped surface wear, joint position failure, bearing position, sealing position, bearing pad wear, etc. can be mechanically repaired, or repaired on site!

For example: all kinds of crusher spindle bearing position; moving E bearing hole; all kinds of conveying fan spindle (such as Roots blower); all kinds of motor rotor bearing position; grinding machine, reducer gear shaft bearing position; Surface treatment and repair of the rotating surface, tower base, partition board, lining erosion surface, etc., many wear and tear can be repaired on site! All kinds of cement machinery shaft, hole, plane, and special-shaped surface wear, joint position failure, bearing position, sealing position, bearing pad wear, etc. can be mechanically repaired, or repaired on site!

2, all kinds of mold damage, strain, sag, bumps, pits, etc. can cause mold failure can be repaired and repaired on site! After repairing, the mold is not annealed, no undercut, no deformation, and the bonding strength is removed by electroplating as an ionic bond. Others are metallurgical, and the bonding strength is comparable to that of the substrate. The material and hardness after repair can be selected according to the mold base! Plastic injection mold, zinc-based alloy plastic mold, TV shell mold, tire mold, various injection mold cavity, telephone mold base, table tennis mold, telescope mold, water meter, plastic bucket, plastic cup and other plastic products , glass mold, cold die

3, the use of weaving machinery is characterized by high utilization of equipment, the workplace is full of flammable materials, the field is not allowed to use open fire operations. Surface technology in the textile industry can not only be used to restore the tolerances and surface reinforcement of various shafts, sliders, rollers, motors, bearings, various types of sleeves, end caps and gear holes, but also for on-site repair and It does not disintegrate, reduce downtime loss, shorten maintenance cycle, and provides a new means for the maintenance of equipment in the textile industry.

All kinds of textile machinery shaft, hole, plane, and special-shaped surface wear, joint position failure, bearing position, sealing position, bearing pad wear, etc. can be mechanically repaired, or repaired on site!

For example: the shaft bearing position of the textile machinery, the bearing position of the roller shaft is not disassembled and repaired, the slender shaft of the wool spinning machine, and the repair of non-ferrous metal parts. Strengthen the aluminum inner sleeve on the textile oiler, repair the cotton roller and the groove of the cotton floor, repair the rib rib groove of the ginning machine, etc.

4, all kinds of ceramic tile mechanical shaft, hole surface wear, mating position failure, bearing position, sealing position, bearing pad wear and other repair!

Such as: a large number of various types of motor rotors in the tile production line, bearing positions of aluminum or cast iron motor end caps, crank cranks, repair of various bearing crushers (ball mills) spindle bearing wear failure, tile presses (such as Rice , Xidi) hydraulic plunger refurbished or repaired partial ditch, etc. 5. All kinds of machine tool guide surface damage due to foreign objects such as iron cutting and other damage caused by damage, strain, bump, pit and other failures can be carried out on site without reducing repair! After the repair, the accuracy of the machine guide rail is reached. 6. Due to the long-term use of the surface of the printing press, the ink is corroded and partially collapsed (one of the reasons for the misregistration); and the partial recessed by the foreign material is not disassembled and repaired. If the damage is serious, the upper grinding machine can be removed after thermal spraying (to achieve the refurbishment effect). The surface after repair is firmly bonded, and the cast iron roller is no longer corroded after treatment (such as Heidelberg, Roland, Germany; Komori, Japan; Miller, Planne Tower, Mitsubishi, Harris and other world famous offset printing machines and other models, such as the Beiren series, we have been Jiangsu Xuzhou Xinhua Printing Factory, Fengxian Hongxiang Printing Factory, Anhui Printing Factory, Xuzhou Express Color Printing Co., Ltd., etc. Repair many printing roller samples for the rubber roller of each printing machine, plate roller thermal spraying application industry and repair of different parts of thermal spraying

1 Paper machine dryer HT20-40 surface scratches, corrosion and wear, local corrosion pits on both ends of the cylinder collapse, need to be repaired and strengthened to prevent further corrosion of scrap arc spray stainless steel "target=_blank> stainless steel molecular formula: 1Gr18Ni9Ti (features : Fast spraying speed, high bonding strength, corrosion resistance to acid and alkali, etc.)

2 Paper mill rubber roller shaft steel, iron bearing wear, excessive wear, slight wear: brush plating, rapid nickel, severe wear: thermal spray, nickel-based powder

3 Upper press bar 45 bearing wear excess wear and light wear: brush plating fast nickel

4 Beater shaft 45 bearing wear, shaft surface is slightly worn by debris wear: brush plating fast nickel severe wear: thermal spray nickel base powder

5 The surface of the felt bar is covered with copper bearing wear, the surface of the shaft is slightly worn by debris and wear: brush plating fast nickel severe wear: thermal spray nickel base powder

6 mesh cage bearing seat carbon steel bearing position wear over-poor light wear: brush plating fast nickel severe wear: thermal spray nickel-based powder

7 ZBJ13/φ150 slurry pump copper bearing position wear tolerance light wear: brush plating fast nickel

8 Pulp propeller copper shaft, hole wear, excessive wear, slight wear: brush plating, rapid nickel, severe wear: thermal spray, nickel-based powder

9 ZBJ2Q1φ100 fine slurry pump cast iron shaft, shell bearing position wear tolerance, slight wear: brush plating fast nickel

10 steaming ball machine steel, iron shaft, hole bearing position wear super-difference light wear: brush plating fast nickel severe wear: thermal spray nickel-based powder

11 Knife and mowing machine steel mating surface wear super-difference light wear: brush plating fast nickel

12 Cyclone dust collector steel, iron bearing position wear super poor light wear: brush plating fast nickel severe wear: thermal spray nickel-based powder

13 Calender steel bearing positions wear excessive wear and light wear: brush plating fast nickel

14 Various types of motor bearing positions and end caps to repair the wear of steel cast iron bearings. Ultra-light wear: Brush plating, rapid nickel, severe wear: thermal spray nickel-based powder

15 The mesh cage shaft of the net cage shaft rotary paper machine is the long axis of the whole cage. After the bearing seat at both ends is worn out, it cannot be repaired by shaft replacement or surfacing, and it can only be scrapped. A cage is about 8,000 yuan. The brush plating technology can accurately repair the over-size of the bearing position and restore the performance of the cage. The brush plating cost is only about 200 yuan.

Casting and forging equipment work in dusty and corrosive environments, and the wear and corrosion of mechanical parts will be more serious. Xuzhou Tiangong surface technology can repair various parts of the hydraulic system of the casting machine, such as the repair and renovation of hydraulic plungers, and the matching positions of various parts, such as bearing position, sealing position, chemical, pesticide machinery, etc. Work in corrosive environments, so to repair such machinery, to consider the anti-corrosion problem of the new Pesticide Factory hydraulic plunger brush plating repair site. 10. Repair of pumps, plungers, spools, etc. in hydraulic and pressure systems. :1Xuzhou Special Forging Machine Tool Manufacturing Co., Ltd. hydraulic cylinder pull groove hard repair one, such as various types of bearing support of flour mill, motor rotor, pressure roller; repair of all kinds of matching parts of imported sugar equipment.

Steamer, dryer, oven inner wall life-enhanced strengthening repair; various roller surface strengthening and repair; centrifugal pump, axial flow pump, steam boiler, valve and mixer shaft sealing sleeve and other parts repair; corrugated roller surface strengthening (enhanced After treatment, the surface hardness of the corrugating roller can be increased to HV1200, and the working life of the corrugating roller can reach more than 40 million meters.

Textile roller, guide wire hook, rapier loom, weft-wearing wear-resistant coating; drenching machine pressure roller, small pressure roller, xilin roller, cast iron outer disk, roll surface, surface roller shaft, upper boring machine drive shaft , Doffer shaft; sizing machine steam valve, drying chamber side shaft plane joint, immersion basket shaft, sizing roller shaft head, spindle journal, yarn guide roller, pressure roller, regain moisture measuring roller, warp beam journal, Threading machine journal; additional grade and pull-off 岌 roller, large roller (black roller), finishing machine roller, guide driver roller, heat roller and dividing roller, guide roller, printing roller roller surface and journal, line Wear-resistant coatings such as wheels and friction discs (sheets).

Printing and printing embossing roller; ceramic anilox roller; coating roller, ink roller, printing roller, water roller; dental pad; dental piece and the like.

Metallurgical blast furnace tuyere, slag-end heat-resistant and corrosion-resistant coating; slab continuous casting line crystallizer, guide roller and conveying roller; various process rolls in steel and non-ferrous metal processing; various roller types in steel surface treatment production line ( Such as continuous annealing furnace rolls, galvanized sinking rolls and various guide rolls, tension rolls, etc.) wear, corrosion and anti-tumor coating.

Power ball mill, steam turbine rotor and generator rotor journal and cylinder joint surface repair; boiler four-tube wear-resistant corrosion-resistant coating; turbine blade anti-cavitation and wear-resistant coating; gas turbine blade, flame tube, transition section high temperature protection coating Layer; wear-resistant coating for wear parts such as fan impeller and ball mill; door core, door stem, valve core, valve fittings, valve seat wear-resistant corrosion-resistant coating and boiler-related equipment components for intensive repair.

Wear-resistant coating for various wear parts of transportation; automobile engine base, synchronizing ring, curved roller repair and pre-strengthening; gear box bearing seat, cylinder plunger, front and rear axle support shaft, gantry guide rail, engine main bearing tile seat, Wear-resistant coating on the wear of the rocker shaft, half shaft oil seal and pin; dredger hoe, anti-wear ring, mud bucket, winch blade, shovel tooth, mud pump impeller, ship's stern axis, Zhangzhou Copper sleeve, eccentric bushing, gear drive shaft, mud pump water seal neck, mud door, skateboard, scraper scraper wear-resistant coating.

Chemical refining of various containers, reactors, pipes, pumps, valves and sealing parts; on-site repair of various enamel tanks and special containers; repair of boilers, air compressors, pumps and other parts.

The glass industry adopts the method of thermal spraying to spray a layer of ceramic on the surface of the lifting roller and the conveying roller, improve the corrosion resistance of the lifting roller and the conveying roller to the molten glass, inhibit the adhesion of the molten liquid phase on the roller surface, and slow the erosion of the molten glass on the roller surface. The roller surface is kept smooth for a long time, the maintenance of the lifting roller and the conveying roller is reduced, the glass quality and the production yield are improved, and the production cost is reduced.

The electrician line adopts the supersonic flame spraying process to spray carbide ceramic coating on the surface of the drawing tower wheel, wire drawing machine, wire drawing wheel, wire wheel, wire drawing cylinder, take-up wire, guide groove, etc., which can make the surface hardness reach HRc75, far. It has higher wear resistance than abrasive steel or chilled cast iron; it can also make the base of these parts made of ordinary steel or cast iron, which reduces the cost and prolongs the service life.

Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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