Technical Topics-第24页-Changsha Langfeng Metallic Material Co., Ltd.

Thermal spray applications
Thermal spray applications As the thermal coating can provide a variety of performance coating, so this process has been widespread attention in the industry. At present, the thermal spray application areas of the most research is the automotive industry and mold industry. Auto industry: Synchronous loop. There are many synchronous ring in the gear box, spray a layer of molybdenum, the gear can work with self-locking function to ensure traffic safety, smooth. At present, China has built a large-scale production base of spraying ring. Piston ring. The outer surface of the aluminum piston ring has a groove which contacts the inner surface of the piston cylinder bore during operation. After spraying a layer of NiCrBSi containing molybdenum powder by plasma spraying, the abrasion resistance of the whole component can be improved.  Exhaust gas sensor. The sensor is made of alumina-based electrolyte, shaped like a test tube, attached to a platinum electrode. In order to prevent the high temperature gas on the platinum electrode erosion, need to spray the spinel coating on the electrode. The sensor is placed in the vehicle exhaust stream, the coating can protect the electrode, but also make the heat to reach the electrode. Cylinder hole....
Titanium-based steel working principle
The use of low-cost high-manganese steel or ultra-high manganese steel for the large wear-resistant parts of the matrix material, in their work site composite titanium carbide carbide inlaid rods, the wear of bimetal composite wear parts with excellent wear resistance, The non-wear surface has excellent ductility and impact toughness. Has been successfully used for large jaw plate, rolling mortar wall, broken wall, vertical grinding roller, vertical grinding disc liner, counter-breaking plate hammer, installed by the user to use, consistent response is good.
Mo2C molybdenum carbide application
Molybdenum carbide has high fusing point and hardness, good thermal stability, mechanical stability; excellent corrosion resistance and other characteristics can be used as coating material, and also addition material in hard metals and grain refine alloys.
Thermal sprayed metal ladder coating ccontrast with commonly used spraying technology and test
(A) plate, spray stainless steel (B) plate and metal ladder coating corrosion (C) board three steel test panels (A plate spray zinc thickness of 160μm, B board spray stainless steel thickness of 160μm  C board spray Zinc thickness of 80μm, spray stainless steel thickness of 80μm) at the same time immersed in water, a few days later removed. As a result, the A plate surface basically no change, with a small hammer gently hit, zinc layer by the impact, friction deformation, displacement, the surface of the exposed parts exposed. B plate surface rust, rust water from the rough surface of stainless steel cracks in the seepage (because of its non-polished, corrosion in the hydraulic steel structure can not be polished, or not only difficult to build and the cost will be several times up), with a small Hammer gently hit the surface of stainless steel, hit part of the rust stripped, showing that the process due to the coating pores, water permeability, steel surface is still in contact with water and corrosion, it can not meet the needs of hydraulic steel underwater corrosion. C board surface, intact as early as no rust, with a small hammer gently hit the...
The main application areas of thermal spray ceramic coating technology
4. Functional coating: Plasma spray supersonic spray superconducting ceramic coating has been successfully applied. Superconducting ceramic coating in the magnetic shielding, microwave components, various types of transmitters, quantum electronic devices, etc. show a good application prospects. In the 0.1mm iron coated with 30μm BaTiO3 coating, the dielectric constant of more than 6000, has been widely used in ceramic chip capacitors. The Al2O3 coating formed by plasma spraying can withstand voltage of 2500 ℃ or higher at high temperature of 1300 ℃ when the thickness is less than 1mm, which meets the requirement of high temperature electrical insulation. Titanium alloy matrix coated with 50-75μm hydroxyapatite and other bioactive ceramics, providing a good chemical compatibility, therefore, can be used as an ideal artificial bone material to be used.
New Development of Arc Spraying Technology-Droplet speed
The performance of arc spraying coating is affected by many factors, and its rapid solidification structure is closely related to the kinetics and heat transfer of droplet in the atomization process. The analysis of the kinetics and heat transfer behavior of the atomization process is not only an important basis for selecting the parameters of the spraying process, but also helps to correctly understand the formation and evolution mechanism of the high speed arc spraying coating. However, due to the limitations of the experimental technique, it is difficult to obtain the heat transfer parameters such as the droplet temperature and the cooling rate by the actual measurement method. Usually, the theoretical model is used for the numerical simulation calculation, and the determination of the atomization gas flow velocity and droplet speed is a prerequisite for the simulation calculation.

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