PTFE Bushing Plugged Leaded Tin Bronze

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PTFE Bushing Plugged Leaded Tin Bronze

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PTFE plugged Leaded Tin Bronze bushes, PTFE Plugged Bronze Bushings

Understanding PTFE Plugged Bronze Bushings: A Blend of Strength and Self-Lubrication,

Polytetrafluoroethylene (PTFE) is a thermoplastic polymer first discovered by accident in 1938. Best known for its use in “non-stick” frying pan coatings, PTFE has a variety of commercial applications. One notable use is as a self-lubricating plug material in cast bronze bushings and wear plates. At room temperature, PTFE is a white solid with several advantageous properties for bearing applications:

Ultra-Low Coefficient of Friction: PTFE has one of the unbeatable coefficients of friction among solid materials, which significantly reduces friction and wear.

Corrosion Resistance: PTFE’s strong carbon-fluorine bonds make it highly resistant to reactive and corrosive chemicals, making it ideal for use in wet and dirty environments.

Marine Environment Compatibility: It can withstand exposure to seawater and marine conditions without degradation.

Wide Temperature Range: PTFE remains solid and maintains its properties across a broad temperature range, from -450°F to +620°F.

In the world of industrial machinery, efficiency and longevity are paramount. PTFE (Polytetrafluoroethylene) plugged bronze bushings represent a significant advancement in bearing technology, offering a unique combination of durability and self-lubrication. This post explores the properties of PTFE, its integration with bronze, and how this combination benefits various industrial applications.

The bronze embedded sliding bearing is constructed from high-strength cast bronze and incorporates PTFE solid lubricant embedded into the bearing’s working surface via precisely drilled holes. It undergoes fine machining using CNC technology to ensure superior performance. The bearing combines the advantages of copper alloy and non-metallic friction-reduction material, it has better corrosion resistance performance, so it suits for application in the field of water conservancy machinery.

Structures

  • 1.Bronze backing
  • 2.Solid lubricant plug (PTFE)
  • 3.Solid lubricant film

Application

Bushing PTFE plugged Leaded Tin Bronze bushes products are suit for working conditions of heavy load and slow speed with water lubrication, e.g. hinge of sluice gate, rock arm of port machinery, submersible pump etc.

PTFE-Plugged Leaded Tin Bronze Bushings in Specialized Applications

1. Hydraulic Turbines

PTFE-plugged leaded tin bronze bushings are essential in hydraulic turbines due to their ability to handle high pressures and variable temperatures. The PTFE plug provides excellent lubrication, reducing friction and wear on turbine components. This lubrication is crucial for maintaining smooth operation and efficiency, even in harsh hydraulic environments where conventional lubricants may fail. Additionally, the corrosion resistance of PTFE ensures longevity and reliability in the face of aggressive hydraulic fluids.

2. Ship Propellers

In ship propellers, PTFE-plugged leaded tin bronze bushings play a vital role in ensuring the smooth rotation of propeller shafts. These bushings endure the constant exposure to seawater and the stresses of propulsion. The PTFE plug provides a low friction surface, reducing wear and extending the service life of the propeller shaft. The excellent corrosion resistance of PTFE ensures that the bushings remain effective and durable despite the harsh marine environment.

3. Boatyard Equipment

Boatyard equipment often operates under demanding conditions, including exposure to various chemicals, heavy loads, and frequent movement. PTFE-plugged leaded tin bronze bushings are ideal for these environments due to their robust self-lubricating properties. The PTFE plug reduces friction and wear, enhancing the performance and longevity of equipment such as winches, cranes, and other mechanical systems used in boatyards.

4. Offshore Platform Equipment

Offshore platform equipment requires components that can withstand extreme conditions, including saltwater, high pressures, and temperature fluctuations. PTFE-plugged leaded tin bronze bushings provide the necessary lubrication and corrosion resistance in such environments. The PTFE’s low coefficient of friction ensures that moving parts operate smoothly, while its resistance to seawater and chemicals helps maintain equipment integrity and reduce maintenance needs.

5. Gas Turbines

In gas turbines, the performance and reliability of bushings are critical due to the high-speed rotation and extreme temperatures involved. PTFE-plugged leaded tin bronze bushings offer superior lubrication, reducing friction and wear on turbine shafts and bearings. The PTFE plug’s ability to maintain its properties across a wide temperature range ensures that the bushings perform consistently even in the high-temperature environment of gas turbines.

6. Hydropower Machinery

Hydropower machinery, such as turbines and generators, benefits from PTFE-plugged leaded tin bronze bushings due to their ability to handle continuous operation and high pressures. The PTFE plug provides efficient self-lubrication, reducing friction and wear on moving parts. Additionally, the corrosion resistance of PTFE ensures that the bushings remain effective in the presence of water and other environmental factors, contributing to the overall reliability and longevity of hydropower equipment.

Key Properties of PTFE

PTFE is renowned for its remarkable traits, which make it an ideal choice for enhancing the functionality of bronze bearings:

  • Ultra-low Coefficient of Friction: With values ranging from 0.05 to 0.10, PTFE’s low friction minimizes wear and enhances the efficiency of machinery.
  • Exceptional Chemical Resistance: Being highly inert, PTFE withstands most chemicals and solvents, making it suitable for corrosive environments.
  • Broad Temperature Tolerance: PTFE remains stable across a vast temperature range, from -450°F to +620°F (-268°C to +327°C), maintaining its properties under extreme conditions.
  • Non-stick Surface: Its non-stick nature prevents material build-up, thus reducing maintenance needs.
  • Superior Electrical Insulation: PTFE is an excellent electrical insulator, making it useful in electrically sensitive applications.

Advantages of PTFE Plugged Bronze Bearings

Combining PTFE with bronze leads to a bearing solution that excels in both strength and lubrication:

  • Self-Lubricating: During operation, PTFE plugs release small amounts of lubricant, reducing the need for additional lubrication and minimizing wear on moving parts.
  • Low Maintenance: The self-lubricating feature of these bearings drastically cuts down maintenance time and costs.
  • Enhanced Durability in Harsh Environments: These bearings perform exceptionally well in marine environments and other corrosive settings.
  • Extended Service Life: The synergy between bronze’s robustness and PTFE’s low friction significantly prolongs the bearing’s lifespan.

Industrial Applications

PTFE plugged bronze bearings are versatile and find applications across a range of sectors:

  • Marine Engineering: Used in ship propellers and boatyard equipment.
  • Energy Production: Crucial in hydraulic and gas turbines, as well as hydropower machinery.
  • Offshore Infrastructure: Ideal for offshore platform equipment due to their corrosion resistance and durability.

Manufacturing Process

These bearings are manufactured in various forms to meet diverse needs:

  • Shapes and Sizes: Available as plain sleeve bearings, flanged bearings, and wear plates.
  • Method: The process involves embedding PTFE plugs into bronze during casting or machining, ensuring a secure and uniform distribution of the lubricant.

PTFE Plugged Leaded Tin Bronze Bushes for Double Eccentric Butterfly Valves

Overview

Double eccentric butterfly valves are essential for efficient fluid control across numerous industrial applications. These valves utilize a disc that pivots along an axis to modulate flow, with their distinctive design minimizing wear and enhancing sealing capabilities. A vital element for their seamless functionality is the bushing, particularly the PTFE (Polytetrafluoroethylene) plugged leaded tin bronze bushes.

Material Composition and Benefits

These bushes represent a hybrid self-lubricating bearing that merges the robustness of bronze with the low friction and self-lubricating qualities of PTFE, making them ideal for demanding conditions where regular maintenance is impractical.

Key Components:

  • Leaded Tin Bronze:
    • High Load Capacity: The foundational bronze material provides superior load-bearing capabilities for strenuous tasks.
    • Good Thermal Conductivity: Bronze efficiently disperses operational heat, lessening overheating risks and potential failures.
    • Corrosion Resistance: The alloy is well-suited to withstand corrosive environments, a critical feature in industrial settings.
  • PTFE Plugs:
    • Low Friction: PTFE’s minimal friction coefficient reduces wear and prolongs bushing lifespan.
    • Self-Lubricating: These plugs negate the need for additional lubrication, simplifying maintenance.
    • Chemical Inertness: PTFE’s resistance to a broad spectrum of chemicals enhances durability against corrosive fluids.

Applications in Double Eccentric Butterfly Valves

Incorporating PTFE plugged leaded tin bronze bushes significantly boosts the performance of double eccentric butterfly valves by:

  • Smooth Operation: PTFE’s low friction allows for effortless disc rotation, enabling precise fluid control.
  • Extended Service Life: The self-lubricating nature of PTFE diminishes wear, thus prolonging valve functionality.
  • Reduced Maintenance: With self-lubrication, these valves demand less upkeep, beneficial in hard-to-reach areas.
  • High Reliability: The robust combination of bronze and PTFE ensures durability under high pressures and loads, crucial for vital industrial processes.

Industries and Applications

These bushes are employed across various sectors, including:

  • Oil and Gas: Essential in pipelines and equipment needing high load capacity and corrosion resistance.
  • Chemical and Petrochemical: Demanding environments where chemical resistance and dependable performance are paramount.
  • Water Treatment: Utilized in water distribution and wastewater management systems.
  • Power Generation: Crucial in hydroelectric stations and other energy infrastructures.

Conclusion

PTFE plugged leaded tin bronze bushes are exemplary for double eccentric butterfly valves, offering a blend of low friction, self-lubrication, robust load capacity, and outstanding corrosion resistance. These properties guarantee smooth operation, reduced maintenance needs, and an extended lifespan, thereby boosting system reliability and efficiency across diverse industrial applications.

PTFE plugged bronze bushings are an exemplary choice for industries requiring reliable, low-maintenance, and durable bearing solutions. Their ability to operate under severe conditions while reducing friction and wear extends the operational life of machinery, making them a wise investment for any high-stakes application.

For those interested in incorporating these advanced bearings into their projects, exploring customized options tailored to specific environmental and operational requirements can provide significant benefits. As we continue to push the boundaries of material science, the integration of PTFE in bronze bushings is a shining example of innovation driving progress.

PTFE’s versatile use extends beyond industrial applications, also making a mark in consumer products like non-stick cookware. Its integration into bronze bushings is a testament to the material’s adaptability and the continuous evolution of engineering solutions. For more detailed information or to discuss how PTFE plugged bronze components can elevate your project, feel free to contact us .

C86500 High Strength Yellow Bronze Bearings

PTFE Bushing Plugged Leaded Tin Bronze Bearing

Guide Bushing

PTFE plugged leaded tin bronze bushes are well-suited for double eccentric butterfly valves due to their excellent lubrication properties and resistance to wear and corrosion. These bushes typically feature leaded tin bronze as the base material, which provides good machinability and resilience against fatigue and load stress. The addition of PTFE (Polytetrafluoroethylene) plugs enhances the self-lubricating capabilities of the bushings, making them ideal for applications where maintenance is difficult or lubrication is infrequent.

Here are some key characteristics and advantages of using PTFE plugged leaded tin bronze bushes in double eccentric butterfly valves:

  1. Self-Lubrication: PTFE has a very low coefficient of friction, which provides a self-lubricating feature that is beneficial in reducing wear and extending the operational life of the valve.
  2. Corrosion Resistance: Leaded tin bronze is known for its excellent corrosion resistance, especially in environments prone to variable temperatures and chemically active fluids.
  3. Durability: The combination of leaded tin bronze with PTFE plugs ensures a high durability and capability to withstand high loads and speeds, which is critical in valve operations that involve frequent opening and closing.
  4. Reduced Maintenance: The self-lubricating properties of these bushes minimize the need for frequent maintenance, which can be crucial in applications where valve accessibility is limited.
  5. Application Suitability: Double eccentric butterfly valves benefit from this type of bushing as they operate under conditions where optimal performance and reduced friction are critical, especially in water and gas systems.

When considering PTFE plugged leaded tin bronze bushes for specific applications, it is important to assess factors like temperature range, fluid compatibility, and operational load conditions to ensure the bushings meet all operational requirements effectively.

The copper-based composite oil-free bearing with PTFE-plugged leaded tin bronze is a product designed with a high-strength cast copper alloy base. It features precisely drilled, orderly arranged holes on the friction surface, which are then filled with PTFE-based solid lubricant materials and machined to precision. This design combines the advantages of copper alloys and non-metallic friction-reducing materials while offering excellent corrosion resistance, making it highly suitable for reliable use in hydraulic machinery applications.

Key Features and Advantages:

  • Wide Application Range: Particularly suitable for heavy-load, low-speed water-lubricated conditions such as sluice gate hinges, port crane slewing bearings, and submersible pumps.
  • Superior Material: Made from Leaded Tin Bronze, offering high hardness and tensile strength.
  • Low Friction Coefficient: Reduces energy loss and wear due to its low friction coefficient.
  • Self-Lubricating Performance: Operates without external lubrication, achieving self-lubrication and maintaining excellent lubrication performance.
  • Good Environmental Adaptability: Maintains stable lubrication and structural integrity under various environmental conditions.
  • High-Temperature Working Capability: Can function at extreme temperatures, exceeding 1200°C, making it suitable for a wide range of applications beyond conventional environments.

These characteristics make the copper-based composite oil-free bearing with PTFE-plugged leaded tin bronze an ideal choice for many engineering applications, especially those requiring high durability, stable performance, and adaptability to diverse environmental conditions.

We manufacture a wide range of cast bronze bearings with PTFE plugs, including PTFE plugged straight bush, plain sleeve bearings, flanged bearings, and wear plates. PTFE plugs significantly extend the service life of bronze components by providing superior lubrication and resistance to harsh environments. Whether you’re dealing with high pressures, extreme temperatures, or corrosive conditions, PTFE-plugged bronze bearings can enhance the performance and durability of your equipment.

The material code for Leaded Tin Bronze under the Indian Standard IS:318 Gr.2 is LTB2. This designation is used to identify a specific grade of leaded tin bronze alloy, which is known for its excellent wear resistance, good machinability, and high strength.

Key Characteristics of IS:318 Gr.2 (LTB2)

  • Chemical Composition:
  • Copper (Cu): Remainder
  • Tin (Sn): 4-6%
  • Lead (Pb): 4-6%
  • Zinc (Zn): Up to 4%

Other elements: May include small amounts of iron (Fe), nickel (Ni), and other impurities.

Properties:

High Wear Resistance: The lead content provides self-lubricating properties, making it suitable for bearing and bushing applications.

Good Machinability: The alloy is easier to machine compared to other bronze alloys.

Corrosion Resistance: Suitable for use in environments where corrosion could be an issue.

Applications: Leaded Tin Bronze (LTB2) is commonly used in:

Automotive Industry: Bearings, bushings, and other components requiring low maintenance.

Industrial Machinery: High-load bearing parts.

Marine Applications: Components exposed to corrosive environments.

For more detailed specifications, you can refer to the IS 318 (1981) standard document, which outlines the requirements for leaded tin bronze ingots and castings.

CuSn5Pb5Zn5, commonly referred to as leaded gunmetal, is a bronze alloy composed of copper, tin, lead, and zinc. It is well-regarded for its outstanding mechanical properties, wear resistance, and machinability. This alloy is particularly valued in industrial applications that demand durability and low friction.

Chemical Composition

The typical chemical composition of CuSn5Pb5Zn5 is as follows:

Copper (Cu): Balance

Tin (Sn): 4-6%

Lead (Pb): 4-6%

Zinc (Zn): 4-6%

Nickel (Ni): Up to 2% max

Iron (Fe), Arsenic (As), Antimony (Sb): Up to 0.5% combined max

Aluminum (Al): 0.01% max

Silicon (Si): 0.02% max

Bismuth (Bi): 0.05% max

Other elements: Up to 0.8% max combined

Mechanical Properties

The mechanical properties of CuSn5Pb5Zn5 include:

Tensile Strength: 200-270 MPa

Yield Strength: 90-112 MPa

Elongation: 6-13%

Brinell Hardness: 60-70 HBW

Impact Strength (Izod): 26 J at 20°C

Standards and Equivalents

CuSn5Pb5Zn5 is recognized under various standards and names across different regions:

BSI BS1400 LG2 (UK)

ASTM B505 C83600 (USA)

EN 1982 CC491K (Europe)

DIN 1705 Rg5 (Germany)

Applications

Due to its exceptional properties, CuSn5Pb5Zn5 is used in a range of applications:

Bearings and Bushings: Ideal for machinery requiring high wear resistance and low friction.

Valves and Pumps: Suitable for components exposed to corrosive environments.

Marine Hardware: Resistant to saltwater corrosion, making it ideal for marine applications.

General Engineering and Automotive Industries: Utilized in components that require durability and reliability.

Summary

CuSn5Pb5Zn5 is a versatile bronze alloy known for its balanced mechanical strength, wear resistance, and corrosion resistance. Its compliance with various international standards makes it suitable for diverse industrial applications across global markets.

For more information on how PTFE-plugged bronze components can benefit your project, please contact us via email.

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