**Features of Bearing Reinforcement Appearance (1)**
Home > Bearing Knowledge > Features of Bearing Reinforcement Appearance (1)
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*Source: Bearing Network | Date: December 29, 2012*
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Although various external reinforcement methods have their own characteristics, they all aim to improve the appearance and performance of bearings. Especially in enhancing wear resistance, corrosion resistance, and anti-fatigue properties, these methods have shown significant effectiveness.
1. **Wear Resistance and Wear Performance**
Wear resistance is one of the most important functional indicators for bearing materials. The factors that affect wear resistance vary depending on the type of wear.
**(1) Grain Wear Resistance**
Bearing steel is usually quenched and hardened. It has been proven that under abrasive wear conditions, there is a linear relationship between material hardness and wear resistance. Therefore, hardness can be used as a basis for evaluating wear resistance. However, when the impact load is high, both hardness and strength must be considered. For high-carbon chromium bearing steel, the composition, type, shape, size, quantity, and distribution of carbides all influence wear resistance. Among these, the carbon content of the matrix and the amount of carbides have the greatest effect. In surface strengthening techniques, increasing the carbon content or forming diffusely distributed hard compounds can enhance surface wear resistance. Examples include carburizing and surface descaling of bearing parts.
**(2) Impact Wear Resistance**
When smoothness is insufficient or fails, metal-to-metal contact is likely to cause adhesive wear. A useful way to prevent or reduce this is to create a thick lubricating film, ensuring that the surfaces do not come into direct contact. Alternatively, changing the physical and chemical properties of the contact surface can make it less prone to adhesion. Some bearing parts are phosphated or blued to form a compound layer on the metal surface, which prevents direct metal contact and reduces or even prevents adhesive wear. Surface nitriding, boronizing, TiC coating, and ion implantation also increase surface hardness, making it more difficult to deform and thus reducing adhesion and wear. Sulfur-nitrogen penetration (sulfur-nitrocarburizing) improves surface hardness and reduces adhesion between mating components, significantly decreasing adhesive wear.
**(3) Fatigue Wear Resistance**
Contact fatigue wear is a common failure mode in bearings. The metallurgical quality and heat treatment of the steel play a crucial role in fatigue resistance. By selecting appropriate surface treatment techniques and proper heat treatment methods, this property can be significantly improved. Testing has shown that within a certain hardness range, increasing the surface hardness of the bearing can also enhance its wear resistance.
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