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Silicon Nitride (Si3N4) Ball Bearing Properties

Silicon nitride is a man made compound synthesized through several different chemical reaction methods. Parts are pressed and sintered by well developed methods to produce a ceramic with a unique set of outstanding properties. The material is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts with a striking appearance. High performance silicon nitride materials were developed for automotive engine wear parts, such as valves and cam followers and proven effective. The cost of the ceramic parts never dropped enough to make the ceramics feasible in engines and turbochargers. The very...

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440c Stainless Steel Balls

440c stainless steel

Type 440C Stainless Steel is commonly used in antifriction bearings, in valves and in several other applications where hardness and corrosion opposition are required. This material is more resistant to wear and abrasion than chromium steel. This is a high alloy, fine grain, through hardening, Martensitic metal that is stainless. Because of its high hardness and fine grain structure, it may be finished to a fine quality that is dimensional.HardnessThis material shall harden to 58 rockwell "C" (58 HRC) minimum. The hardness is measured on parallel ground flats or the reading taken at first glance that is spherical corrected for...

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How Are Ball Bearings Made?

How are ball bearings produced?

How a Precision Ball is Made Heading: To begin, heading machines cut wire into short lengths and shape it into spherical shapes between sized dies. Deflashing: The flash line, the lip left by the forming dies, is ground off as balls roll between heavy, cast iron plates. Soft Grinding: Similar to deflashing, except that a fine grit grinding stone is used to improve precision. Heat-treating: Carbon steel balls are next carburized and hardened. Heat treatment allows for the desired hardness and case depth. Descaling: This step takes away the residues and small burrs from the heat-treating process. Hard Grinding: Slow, methodical grinding ensures proper sizing and sphericity, with tolerances...

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Stainless Steel Ball Bearing Composition

Table 1: Austenitic Stainless Steel Chemical Compositions (Weight Percent) Austenitic Stainless Steels Common Name UNS No. C Cr Ni Mo N Mn Cu Other 201 S20100 0.15 16.0-18.0 3.5-5.5 - 0.25 5.50-7.50 - - 301 S30100 0.15 16.0-18.0 6.0-8.0 - 0.10 2.00 - - 304L S30403 0.030 17.5-19.5 8.0-12.0 - 0.10 2.00 - - 305 S30500 0.12 17.0-19.0 10.5-13.0 - - 2.00 - - 321 S32100 0.08 17.0-19.0 9.0-12.0 - 0.10 2.00 - Ti 5x(C+N) 347 S34700 0.08 17.0-19.0 9.0-13.0 - - 2.00 - Cb 10xC to 1.00 309S S30908 0.08 22.0-24.0 12.0-15.0 - - 2.00 - - 310S S31008...

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Advantages And Disadvantages Of Ceramic Bearings

Advantages Ceramic microstructures enjoy covalent bonding inherent between non-metal elements. This means they share electrons. This atomic co-operation yields a very strong attraction force and because of this, ceramics offer a series of benefits in comparison to metals. They normally have a very high hardness (70-90 HRc) and elastic, or Young’s, modulus. This means they are resistant to shape change when loads are applied along with improved wear characteristics. Ceramic bearings can run lubrication free. This is because ceramic materials don’t micro-weld. Micro-welding happens, typically with metals, when the surface imperfections on the rolling element and raceway interact with one...

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