Graphite Bearing: A Key Component in the Mechanical Equipment

  • Low coefficient of thermal expansion, low friction coefficient.
  • Excellent self-lubrication.
  • High thermal conductivity and thermal stability.
  • Good physical & mechanical properties.
A graphite bearing is displayed.

Graphite bearing, also known as carbon graphite bearing, is a commonly used lubricant part in the industrial machinery and is divided into radial bearing and thrust bearing. Bearing materials include metal, nonmetal and composite materials. Graphite bearing is a sliding bearing with high mechanical equipment performance requirements.

Unlike metal bearings, graphite bearing has self-lubrication, qualitative light, high temperature resistance, corrosion resistance and other superior properties. It can not only be used in high temperature, low temperature, high speed and low speed sliding conditions, but also can be used in strongly corrosive gas and liquid media conditions. It is widely used in centrifugal pumps, submersible pumps, liquid pumps, and other mechanical equipment.

  • Excellent self-lubrication.
  • High thermal conductivity and thermal stability.
  • Good chemical corrosion resistance.
  • Good wear resistance and high mechanical strength.
Table 1: Specifications of Graphite Bearing
Grade Density (g/cc) Porosity Shore Hardness Compressive Strength (Mpa) Flexural Strength (Mpa) CTE (×10-6°C-1) Max Working Temperature Application
M105K(Resin Impregnation Vanes) 1.8 2% 60 110 65 200 °C Carbon vanes
M106K(Resin Impregnation) 1.8 2% 65 180 60 4 200 °C Seal rings, bush
M106D(Antimony Impregnation) 2.3 3% 80 230 80 4 550 °C Seal rings, bush
M254A(Copper Impregnation) 2.4 2.5% 70 170 65 500 °C Seal rings, bush
  • 1 MPa = 10.2 kgf/cm2; 1 W/m.k = 0.86 kcal/cm.h.°C
  • These properties are typical values and not guaranteed.
Related Introduction: Application of Graphite Bearing

Graphite bearings are a kind of bearing that does not require grease lubricants. They are mainly used in the following 3 types of applications. 1. In applications where the use of grease lubricants is prohibited, such as in the equipment of food, beverage, textile, chemical and other industrial sectors; 2 In applications where ordinary bearing cannot be used due to high temperatures, such as high temperature material handling machine and flue valve regulating machines; 3. In applications where corrosive gases or liquids exist, like bearings used in chemical and textile industries. Graphite bearing does not require grease lubricants and can reduce contamination and maintenance costs. Besides, it has good high temperature resistance, corrosion resistance and self-lubrication.