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Research on friction-improving fusion wear properties of plasma sprayed molybdenum-based alloy coatings

  • Categories:Company Dynamics
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-03-25
  • Views:

(Summary description)Research on friction-improving fusion wear properties of plasma sprayed molybdenum-based alloy coatings: In mechanical composite components, as long as there is movement, there will inevitably be friction and wear problems between matching parts. Due to the difference in the working conditions of the friction pair and the complexity of the working conditions, the consequences lead to the intricate damage process of the friction surface, and there are many forms of damage. Surface damage caused by friction, a form of wear, can be roughly divided into fusion wear, abrasive wear, corrosion wear, and contact fatigue wear. Because of the fusion wear, most of the wear occurs in the initial running-in process of the friction pair, and its occurrence often destroys the working surface of the matching parts, making the entire unit unable to operate normally. Therefore, in all forms of wear, the damage it brings is particularly prominent. In the mechanical movement, the working conditions of fusion wear of the friction pair are as follows: 1. When there is lubricating oil, the cylinder liner and piston ring in the diesel engine work under the condition of lubricating oil. Due to the use of supercharging technology, the power of the diesel engine is improved, so the heat of the cylinder liner and the piston ring is increased. The load and mechanical load also increase, so the phenomenon of "pulling the cylinder" and the fusion and wear of the piston ring continue to occur. 2. The piston rod in the reciprocating cycle compressor that appears in the working conditions without direct oil supply and lubrication, it not only needs to transmit power, but also bear the seal, and it works without direct oil supply and lubrication, so it is extremely Easy to produce fusion wear. There are many factors that cause friction pair wear, and providing good lubrication conditions is an important factor in reducing wear. Theoretically speaking, under the protection of continuous oil film or grinding medium, the pair of parts that make up the friction pair will hardly wear out. However, under actual working conditions, this is often difficult to achieve due to the combined influence of various factors. Therefore, if the lubricating film is destroyed, the matching parts will be in contact with each other between metals. At this time, under the working conditions of high speed, high temperature and high pressure, extremely high frictional heat is generated in the tiny area of ​​the contact part instantly, which makes the contact between the materials. Melt adhesion occurs to form a source of failure. At the same time, under the high-speed movement of the parts, the source of damage expands, and the adhesive part is torn or peeled off in the form of cracked fragments, and embedded between the friction pairs. These hard particles form a cutting action between the two sliding surfaces, which destroys the friction surface and causes fusion wear. This process resulting from fusion wear is, in short, "severe damage characterized by localized fusion of two sliding surfaces". Therefore, an effective way to improve fusion wear must meet the following conditions: 1. Make the friction surface have unique oil storage characteristics to make up for the lack of lubricating oil before the critical lubrication state occurs and avoid the emergence of the critical lubrication state. 2. Improve the high temperature resistance of the working surface of the parts and avoid the influence of instantaneous frictional heat. The sub-alloyed molybdenum-based alloy coating obtained by the plasma spraying process is one of the effective ways to solve the fusion wear in the above-mentioned mechanism. In addition to solid, liquid, and gaseous states, plasma is called the fourth state of matter. It is a special "gas" composed of positive and negative charged particles in a certain proportion by ionization of a certain gas under the action of an electric field. Due to mechanical compression, magnetic shrinkage and thermal shrinkage, the plasma energy is highly concentrated. Because the spraying is mainly based on powder materials, various sub-alloy coatings with different performance requirements can be prepared through the mixing ratio of different powder materials. Plasma spraying technology has become a versatile surface treatment process and is increasingly used to prepare surface coatings for wear resistance, scratch resistance, electrical conduction, thermal insulation, insulation, corrosion protection and other special purposes. Generally, inert gas argon or supplemented with argon, nitrogen or helium is used. This facilitates plasma technology to guarantee specific properties of the coating material. In addition, since the base material will not be directly heated during spraying, problems such as deformation caused by the heating of the workpiece are also avoided.

Research on friction-improving fusion wear properties of plasma sprayed molybdenum-based alloy coatings

(Summary description)Research on friction-improving fusion wear properties of plasma sprayed molybdenum-based alloy coatings:
In mechanical composite components, as long as there is movement, there will inevitably be friction and wear problems between matching parts. Due to the difference in the working conditions of the friction pair and the complexity of the working conditions, the consequences lead to the intricate damage process of the friction surface, and there are many forms of damage. Surface damage caused by friction, a form of wear, can be roughly divided into fusion wear, abrasive wear, corrosion wear, and contact fatigue wear.
Because of the fusion wear, most of the wear occurs in the initial running-in process of the friction pair, and its occurrence often destroys the working surface of the matching parts, making the entire unit unable to operate normally. Therefore, in all forms of wear, the damage it brings is particularly prominent.
In the mechanical movement, the working conditions of fusion wear of the friction pair are as follows:
1. When there is lubricating oil, the cylinder liner and piston ring in the diesel engine work under the condition of lubricating oil. Due to the use of supercharging technology, the power of the diesel engine is improved, so the heat of the cylinder liner and the piston ring is increased. The load and mechanical load also increase, so the phenomenon of "pulling the cylinder" and the fusion and wear of the piston ring continue to occur.
2. The piston rod in the reciprocating cycle compressor that appears in the working conditions without direct oil supply and lubrication, it not only needs to transmit power, but also bear the seal, and it works without direct oil supply and lubrication, so it is extremely Easy to produce fusion wear.
There are many factors that cause friction pair wear, and providing good lubrication conditions is an important factor in reducing wear. Theoretically speaking, under the protection of continuous oil film or grinding medium, the pair of parts that make up the friction pair will hardly wear out.
However, under actual working conditions, this is often difficult to achieve due to the combined influence of various factors. Therefore, if the lubricating film is destroyed, the matching parts will be in contact with each other between metals. At this time, under the working conditions of high speed, high temperature and high pressure, extremely high frictional heat is generated in the tiny area of ​​the contact part instantly, which makes the contact between the materials. Melt adhesion occurs to form a source of failure.
At the same time, under the high-speed movement of the parts, the source of damage expands, and the adhesive part is torn or peeled off in the form of cracked fragments, and embedded between the friction pairs. These hard particles form a cutting action between the two sliding surfaces, which destroys the friction surface and causes fusion wear. This process resulting from fusion wear is, in short, "severe damage characterized by localized fusion of two sliding surfaces".
Therefore, an effective way to improve fusion wear must meet the following conditions:
1. Make the friction surface have unique oil storage characteristics to make up for the lack of lubricating oil before the critical lubrication state occurs and avoid the emergence of the critical lubrication state.
2. Improve the high temperature resistance of the working surface of the parts and avoid the influence of instantaneous frictional heat. The sub-alloyed molybdenum-based alloy coating obtained by the plasma spraying process is one of the effective ways to solve the fusion wear in the above-mentioned mechanism.
In addition to solid, liquid, and gaseous states, plasma is called the fourth state of matter. It is a special "gas" composed of positive and negative charged particles in a certain proportion by ionization of a certain gas under the action of an electric field. Due to mechanical compression, magnetic shrinkage and thermal shrinkage, the plasma energy is highly concentrated.
Because the spraying is mainly based on powder materials, various sub-alloy coatings with different performance requirements can be prepared through the mixing ratio of different powder materials. Plasma spraying technology has become a versatile surface treatment process and is increasingly used to prepare surface coatings for wear resistance, scratch resistance, electrical conduction, thermal insulation, insulation, corrosion protection and other special purposes.
Generally, inert gas argon or supplemented with argon, nitrogen or helium is used. This facilitates plasma technology to guarantee specific properties of the coating material. In addition, since the base material will not be directly heated during spraying, problems such as deformation caused by the heating of the workpiece are also avoided.

  • Categories:Company Dynamics
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-03-25 17:34
  • Views:
Information

Research on friction-improving fusion wear properties of plasma sprayed molybdenum-based alloy coatings:
In mechanical composite components, as long as there is movement, there will inevitably be friction and wear problems between matching parts. Due to the difference in the working conditions of the friction pair and the complexity of the working conditions, the consequences lead to the intricate damage process of the friction surface, and there are many forms of damage. Surface damage caused by friction, a form of wear, can be roughly divided into fusion wear, abrasive wear, corrosion wear, and contact fatigue wear.

Because of the fusion wear, most of the wear occurs in the initial running-in process of the friction pair, and its occurrence often destroys the working surface of the matching parts, making the entire unit unable to operate normally. Therefore, in all forms of wear, the damage it brings is particularly prominent.
In the mechanical movement, the working conditions of fusion wear of the friction pair are as follows:
1. When there is lubricating oil, the cylinder liner and piston ring in the diesel engine work under the condition of lubricating oil. Due to the use of supercharging technology, the power of the diesel engine is improved, so the heat of the cylinder liner and the piston ring is increased. The load and mechanical load also increase, so the phenomenon of "pulling the cylinder" and the fusion and wear of the piston ring continue to occur.
2. The piston rod in the reciprocating cycle compressor that appears in the working conditions without direct oil supply and lubrication, it not only needs to transmit power, but also bear the seal, and it works without direct oil supply and lubrication, so it is extremely Easy to produce fusion wear.
There are many factors that cause friction pair wear, and providing good lubrication conditions is an important factor in reducing wear. Theoretically speaking, under the protection of continuous oil film or grinding medium, the pair of parts that make up the friction pair will hardly wear out.
However, under actual working conditions, this is often difficult to achieve due to the combined influence of various factors. Therefore, if the lubricating film is destroyed, the matching parts will be in contact with each other between metals. At this time, under the working conditions of high speed, high temperature and high pressure, extremely high frictional heat is generated in the tiny area of ​​the contact part instantly, which makes the contact between the materials. Melt adhesion occurs to form a source of failure.
At the same time, under the high-speed movement of the parts, the source of damage expands, and the adhesive part is torn or peeled off in the form of cracked fragments, and embedded between the friction pairs. These hard particles form a cutting action between the two sliding surfaces, which destroys the friction surface and causes fusion wear. This process resulting from fusion wear is, in short, "severe damage characterized by localized fusion of two sliding surfaces".
Therefore, an effective way to improve fusion wear must meet the following conditions:
1. Make the friction surface have unique oil storage characteristics to make up for the lack of lubricating oil before the critical lubrication state occurs and avoid the emergence of the critical lubrication state.
2. Improve the high temperature resistance of the working surface of the parts and avoid the influence of instantaneous frictional heat. The sub-alloyed molybdenum-based alloy coating obtained by the plasma spraying process is one of the effective ways to solve the fusion wear in the above-mentioned mechanism.
In addition to solid, liquid, and gaseous states, plasma is called the fourth state of matter. It is a special "gas" composed of positive and negative charged particles in a certain proportion by ionization of a certain gas under the action of an electric field. Due to mechanical compression, magnetic shrinkage and thermal shrinkage, the plasma energy is highly concentrated.
Because the spraying is mainly based on powder materials, various sub-alloy coatings with different performance requirements can be prepared through the mixing ratio of different powder materials. Plasma spraying technology has become a versatile surface treatment process and is increasingly used to prepare surface coatings for wear resistance, scratch resistance, electrical conduction, thermal insulation, insulation, corrosion protection and other special purposes.
Generally, inert gas argon or supplemented with argon, nitrogen or helium is used. This facilitates plasma technology to guarantee specific properties of the coating material. In addition, since the base material will not be directly heated during spraying, problems such as deformation caused by the heating of the workpiece are also avoided.

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