Physical properties of high temperature resistant materials for bearings

Release time:

2023-09-08

Porosity: refers to the percentage of pore volume in the material as a percentage of the total volume of the material. The pores of SKF bearing high temperature resistant materials can be divided into three types according to their existing forms: closed pores, one pores - pores connected to the outside atmosphere, connected pores - the proportion of the entire pores is 7L. Small SKF bearing high temperature resistant materials have the ability to resist erosion and structural strength; the higher the porosity, especially the more interconnected pores, the lower the thermal conductivity of the material. Lightweight adobe bricks, lightweight high-alumina bricks and other insulation materials use a method to increase porosity and reduce their thermal conductivity.

(1) Porosity: refers to the percentage of pore volume in the material as a percentage of the total volume of the material. The pores of SKF bearing high temperature resistant materials can be divided into three types according to their existing forms: closed pores, one pores - pores connected to the outside atmosphere, connected pores - the proportion of the entire pores is 7L. Small SKF bearing high temperature resistant materials have the ability to resist erosion and structural strength; the higher the porosity, especially the more interconnected pores, the lower the thermal conductivity of the material. Lightweight adobe bricks, lightweight high-alumina bricks and other insulation materials use a method to increase porosity and reduce their thermal conductivity.

(2) Water absorption: the mass percentage of water absorbed by the pores in the material as a percentage of the dry mass of the material.

(3) Air permeability: The air permeability of SKF bearing high-temperature resistant materials can be expressed by the air permeability coefficient, that is, the air volume of SKF in the lm2 area carrying high-temperature resistant materials with a thickness of 1 m under 1 m. The differential pressure is 10 Pa.

For high-temperature resistant materials for SKF bearings, the air permeability of the product should be as small as possible, but in special cases, a certain degree of air permeability is required.

If molten steel is purified through breathable bricks, the breathability of the product is considered one of the main performance indicators.

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