Physical Properties of High-Temperature-Resistant Materials for SKF Bearings
2022-06-07
1. Porosity refers to the percentage of a material’s total volume occupied by its internal pores. SKF bearing materials designed for high-temperature applications can be categorized into three types based on their pore structure: closed pores, single pores connected to the external atmosphere, and interconnected pores. The porosity of SKF high-temperature bricks is 7L. These lightweight, high-temperature-resistant materials exhibit excellent resistance to erosion and maintain strong structural integrity. Notably, the higher the porosity—especially when more pores are interconnected—the lower the material’s thermal conductivity. Lightweight clay bricks, lightweight high-alumina bricks, and other insulation materials often employ specific techniques to enhance porosity, thereby reducing their thermal conductivity.
2. Water Absorption Rate: The percentage by mass of water absorbed into the material's pores, relative to the material's dry mass.
3. Breathability: The breathability of SKF bearings made from high-temperature materials is quantified by the permeability coefficient—defined as the volume of air (in m³) that can pass through a 1 m² area of the high-temperature bearing material, which has a thickness of 1 m, under a pressure difference of 10 Pa and a flow distance of 1 meter. For SKF bearings crafted from high-temperature materials, the product’s breathability should be minimized whenever possible; however, in certain specialized applications, a degree of controlled breathability becomes essential. For instance, when molten steel is purified via breathable bricks, the material’s breathability is considered one of the key performance indicators.
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