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Related Concept Videos

Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Journal Bearings01:23

Journal Bearings

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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
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Pivot Bearings01:23

Pivot Bearings

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In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
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Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
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Related Experiment Video

Updated: Jul 24, 2025

Biotribological Testing and Analysis of Articular Cartilage Sliding against Metal for Implants
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Biotribological Testing and Analysis of Articular Cartilage Sliding against Metal for Implants

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Metal-Driven Autoantifriction Function of Artificial Hip Joint.

Qiaoyuan Deng1,2, Qingguo Feng1, Peipei Jing1

  • 1Institute of Biomedical Engineering, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, College of Medicine, Southwest Jiaotong University, Chengdu, Sichuan, 610031, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 6, 2023
PubMed
Summary

Researchers developed a novel copper-doped titanium nitride (TiNX -Cu) coating for artificial hip joints. This "autoantifriction" coating significantly reduces friction and wear, potentially extending the lifespan of hip prostheses for younger patients.

Keywords:
TiNX-Cu filmsartificial hip jointsautoantifrictiongraphite-like carbon filmswear resistance

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Area of Science:

  • Biomaterials Engineering
  • Tribology
  • Surface Science

Background:

  • Artificial hip joint prostheses have a limited service life of 10-15 years.
  • Improving the friction coefficient and wear resistance of metallic femoral heads is crucial for extending prosthesis longevity, especially in young patients.

Purpose of the Study:

  • To develop and evaluate a novel Cu-doped titanium nitride (TiNX -Cu) film with autoantifriction properties.
  • To enhance the lifespan of artificial hip joints by reducing friction and improving wear resistance.

Main Methods:

  • Magnetron sputtering was used to deposit a TiNX -Cu film onto a CoCrMo alloy.
  • The tribological performance of the Al2 O3 /TiNX -Cu tribopair was investigated in a protein-containing lubricating medium.

Main Results:

  • The Cu in the TiNX -Cu film binds to proteins, forming a stable surface layer.
  • Shear stress between the tribopair decomposes adsorbed proteins into hydrocarbon fragments.
  • Copper catalysis and shear stress synergistically convert fragments into graphite-like carbon tribofilms, reducing friction and enhancing wear resistance.

Conclusions:

  • The developed TiNX -Cu film exhibits 'autoantifriction' properties by generating antifriction tribofilms.
  • This technology holds promise for prolonging the lifespan of prosthetic devices, including artificial hip joints.