Corrosion Resistant Superior Sintered Bronze Bushing C93200 Bronze Bearing

توضیحات

What Is a Sintered Bronze Bushing?

A sintered bronze bushing is a cylindrical bearing component made by compacting bronze powder under high pressure and then heating it below the melting point to fuse the particles. This process creates a uniformly porous structure—typically 18% to 25% of its volume consists of microscopic interconnected pores. This porous matrix is then impregnated with lubricating oil under vacuum.

During operation, frictional heat causes the oil to expand and migrate from the pores to the bearing surface, forming a thin hydrodynamic film that reduces friction. When operation stops, the oil cools and is partially reabsorbed via capillary action. This ingenious self-oiling mechanism is why they are celebrated as a maintenance-free bearing solution.

Why Choose Custom Sintered Bronze Bushings?

Off-the-shelf sintered bronze bushings may not always fit your specific application. Standard inner diameters, outer diameters, or lengths may not align with your assembly requirements. Custom sintered bronze bushings provide the perfect solution for applications demanding precise fitment and optimal performance.

With powder metallurgy, every aspect of it can be customized to your exact specifications. The inner diameter can be precisely matched to your shaft size, typically from 2mm to 150mm. The outer diameter and length can be optimized for your housing. Flanged designs are available for axial positioning. Material compositions can be selected from various bronze alloys.

Our manufacturing process ensures that each sintered bronze bushing achieves tight tolerances, with consistent quality across every part, from prototypes to high-volume production runs.

How Sintered Bronze Bushings Are Made:

The production of this product follows a precise sequence of operations:

Mixing and Blending: Metal powders, such as copper, tin, and graphite, are mixed in fixed ratios. Organic lubricants are occasionally added to facilitate molding operations.

Mold Compaction: The powder mixture is pressed into a mold under high pressure, typically 50,000 to 70,000 PSI. This forms a green compact that has sufficient strength to handle before sintering.

Sintering: The green compact is heated in a furnace to a temperature below the metal’s melting point, typically around 1100°F, under controlled atmosphere. The particles bond into a solid structure with uniform porosity.

Calibration: The bushing is sized on inner and outer diameters to achieve final dimensions and tolerances.

Oil Impregnation: The sintered parts are impregnated with oil under vacuum, filling the internal pores. This is a crucial step that provides self-lubricating properties.

Common Materials for Sintered Bronze Bushings:

SAE 841 Bronze is the most common material for sintered bronze bushings. It offers excellent wear resistance, self-lubricating properties, and good corrosion resistance. Suitable for general industrial applications, automotive components, and household appliances.

Cu660 Bronze features a composition of copper with tin, zinc, and lead. Offers good machinability and wear resistance.

Cu663 Bronze provides higher strength with tin and zinc content. Suitable for moderate load applications.

Cu9010 Bronze offers high tin content for improved strength and wear resistance.

Types of Sintered Bronze Bushings:

Plain Cylindrical Bushing:

Standard straight cylindrical sleeve. Most common configuration for general applications. Suitable for motors, appliances, and industrial equipment.

Flanged Bushing:

Features an integral flange for axial positioning. Eliminates the need for separate thrust washers. Suitable for applications with axial loads.

Graphite Plugged Bushing:

Features graphite plugs for dry-running applications. Suitable for high-temperature or food processing environments where oil cannot be used.

Custom Sintered Bushing:

Engineered to exact specifications including unique diameters, lengths, flange dimensions, and material compositions.

Applications of Custom Sintered Bronze Bushings:

Electric Motors:

Sintered bronze bushings are used in motor bearings where self-lubrication is essential for maintenance-free operation.

Household Appliances:

Sintered bronze bushings are found in washing machines, refrigerators, vacuum cleaners, and fans.

Automotive:

Sintered bronze bushings are used in starters, alternators, and various engine components.

Industrial Machinery:

Sintered bronze bushings provide reliable bearing support in printing machinery, machine tools, and packaging equipment.

Office Equipment:

They are used in copiers, printers, and other office machines.

Frequently Asked Questions:

Q: What is a sintered bronze bushing used for?

A: It provides self-lubricating bearing support for shafts in rotating and sliding applications. It is used in motors, appliances, automotive components, and industrial machinery.

Q: What is the difference between sintered bronze and solid bronze bushings?

A:They are porous and oil-impregnated, providing self-lubrication. Solid bronze bushings require external lubrication but offer higher strength and load capacity.

Q: What is the maximum temperature for sintered bronze bushings?

A: Sintered bronze bushings typically operate from -100°C to +200°C. Above 80-90°C, oil can oxidize or evaporate, reducing the lubrication effect.

Q: What tolerances can you hold?

A: Typical tolerances for them are ID H7 and OD S7 or other specific fits depending on application requirements.

Q: Can you match an existing bushing?

A: Yes, we can replicate any standard or custom sintered bronze bushing. Provide your specifications or a sample for exact duplication.