Piston rings, synchronizer rings, synchronizer bodies, shift forks, and other automotive parts bear high mechanical loads during operation, thus requiring extremely high sliding performance and wear resistance.
Flame spraying is a highly efficient surface treatment technology. Molybdenum wire, due to its high melting point, good thermal conductivity, and excellent wear and corrosion resistance, is commonly used in flame spraying to coat vehicle and mechanical parts, thereby improving their surface wear resistance.
High-Quality Thermally Sprayed Molybdenum Wire
Thermally sprayed molybdenum wire is produced using powder metallurgy methods, selecting higher purity raw materials at the molybdenum powder level to ensure high material purity.
Sampling inspection is conducted on each batch of raw materials, and each batch of products has a batch number for traceability, strictly guaranteeing product quality.
The molybdenum wire is free of splitting, obvious scratches, and weld joints; the wire diameter is uniform, and diameter tolerances are strictly controlled. Eddy current testing can be performed.
Molybdenum Wire Size:
We can supply thermally sprayed molybdenum wires with diameters ranging from 1.00 mm to 3.90 mm. Standard sizes are 2.31 mm and 3.17 mm.
Molybdenum Wire Density: 10-20 g/cm³
Molybdenum Wire Purity: ≥99.95%
Molybdenum Wire Surface:
Black surface (unwashed, graphite residue still present)
White surface (metallic matte finish after chemical cleaning)
What is Flame Spraying Process?
This process utilizes a flame generated by igniting a mixture of oxygen and fuel gas (usually acetylene, propane, or propylene). The thermally sprayed molybdenum wire is melted by the heat of the flame, and the molten particles are sprayed at high speed onto the substrate using compressed air.
Precautions During Spraying
To ensure the quality and performance of the coating during thermally sprayed molybdenum wire application, the following key points must be observed:
Substrate Pretreatment: Before spraying, the substrate must be thoroughly cleaned and pretreated to remove impurities such as oil, rust, and oxide layers. This helps improve the bonding strength between the coating and the substrate, ensuring coating stability.
Spraying Distance and Angle: Spraying distance and angle have a significant impact on coating quality and performance. Generally, the spraying distance should be controlled within an appropriate range to ensure uniform distribution and full fusion of the sprayed particles. Simultaneously, the spraying angle should also be adjusted appropriately to avoid flow or overlap of sprayed particles on the substrate surface.
Spraying Speed and Pressure: Spraying speed and pressure are important factors affecting coating quality. Excessive spraying speed may result in a coating that is too thin or insufficiently fused, while excessively slow spraying speed may result in a coating that is too thick or flow. Furthermore, the spraying pressure also affects the trajectory of the sprayed particles and the degree of fusion. Therefore, spraying speed and pressure should be adjusted according to actual conditions to obtain the ideal coating effect.
Heating and Melting of Sprayed Material: During the spraying process, it is essential to ensure that the molybdenum wire is uniformly heated to a molten or semi-molten state. Excessively high temperatures may cause the molybdenum wire to ablate or oxidize, while excessively low temperatures may result in incomplete melting of the sprayed particles. Therefore, strict control of the heat source temperature and heating time is necessary to ensure the quality of the sprayed material.
Post-treatment and Inspection: After spraying, the coating should undergo necessary post-treatment, such as cooling and curing. Simultaneously, the coating needs to be inspected for quality, including tests for thickness, hardness, and abrasion resistance, to ensure that the coating meets design requirements and usage standards.
Limitations in Thermal Spraying of Molybdenum Wire Applications:
The operating limit of pure molybdenum under oxidizing conditions is approximately 300°C. Temperature exposure increases in reducing environments. Molybdenum cannot be used on copper, copper alloys (copper content exceeding 20%), chrome-plated, or nitrided parts. However, molybdenum can be used on hardened substrates to achieve better sealing performance.
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Post time: Apr-03-2026