Silicon Nitride Ceramic Bearings
Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
Silicon nitride ceramic bearing processing parts, processing flow and method: diamond grinding wheel grinding removes material because when the abrasive grains cut into the workpiece, the material in front of the abrasive grain cutting edge is squeezed, and when the compressive stress value exceeds the limit of the ceramic material, it is crushed On the other hand, when the abrasive grains cut into the workpiece, due to the compressive stress and frictional heat, the material under the abrasive grains will produce local plastic flow and form a deformed layer. After the abrasive grains pass by, due to the disappearance of the stress, Cause the deformed layer to detach from the workpiece to form chips In the whole process of material removal, the crush removal of the rake face is the main one.
Silicon nitride ceramics is a kind of high-temperature-resistant high-strength structural ceramics with broad development prospects. Compared with other ceramic materials, silicon nitride ceramics have higher performance (such as high strength, high hardness, good thermal shock resistance, and fatigue resistance). High toughness, high bending strength at room temperature, wear resistance, chemical corrosion resistance and good high temperature stability, oxidation resistance, etc.), and has a small specific gravity.
Silicon nitride is a covalent compound, so the atoms are bound to each other with a strong covalent bond, so it has a high hardness and melting point. , the thermal shock resistance of silicon nitride ceramics prepared by hot pressing with a grain size of about 100nm shows that nano-silicon nitride ceramics exhibit the characteristics of original short crack propagation; The mechanical properties and thermal shock resistance of ceramics have a certain influence. In the nanoscale range, silicon nitride ceramics with coarser grains have better thermal shock resistance; with the increase of -Si3N4 content in the starting powder, silicon nitride The thermal shock resistance of ceramics has been significantly improved.
Silicon nitride ceramics can be used as circuit substrates, high-temperature insulators, capacitors, radar antennas, etc. Silicon nitride has excellent chemical stability. Silicon nitride has excellent chemical stability. Stability Silicon nitride has high hardness, silicon nitride has high hardness, and low coefficient of friction.