scholarly journals Performance of High-Speed Ball Bearings With Lead and Lead-Alloy-Plated Retainers in Liquid Hydrogen at 1.2 Million DN

1974 ◽  
Vol 96 (3) ◽  
pp. 437-442 ◽  
Author(s):  
D. E. Brewe ◽  
H. W. Scibbe ◽  
D. W. Wisander
Keyword(s):  
Coating Thickness ◽  
Copper Alloy ◽  
High Speed ◽  
Alloy Coating ◽  
Liquid Hydrogen ◽  
Aluminum Bronze ◽  
Ball Bearings ◽  
Lead Alloy ◽  
Bronze Alloy ◽  
Thrust Load

Forty-millimeter-bore ball bearings with lead and lead-alloy-coated retainers were operated in liquid hydrogen at 30000 rpm under a thrust load of 1780 Newtons (400 lb). Bearing lives were compared using different (1) lead- and lead-alloy coatings, (2) coating thicknesses, (3) substrate materials, (4) retainer locating surfaces, and (5) plating techniques. Longer bearing run times were achieved using retainers with a lead-tin-copper alloy coating electroplated onto a leaded-bronze material (22.5 hr) and an aluminum-bronze alloy (19.3 hr). Thirty percent of the bearings tested achieved the desired objective of 10 hours. All of the lead-alloy coated retainers exceeded this objective. A coating thickness of at least 36 microns (0.0014 in.) was used for all bearings exceeding the 10-hour goal.

COPPER ALLOY No. C94300

Alloy Digest ◽  
1984 ◽  
Vol 33 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
Copper Alloy ◽  
High Speed ◽  
Heat Treating ◽  
Lead Alloy ◽  
Good Resistance ◽  
Tin Bronze ◽  
Strength Medium

Abstract Copper Alloy No. C94300 is a cast copper-tin-lead alloy (bronze). It is characterized by low hardness and strength, medium ductility, excellent machinability and good resistance to corrosion. Commercial names formerly used (but not recommended) are (1) Ingot No. 322, (2) Soft Bronze, (3) High-Leaded Tin Bronze and (4) 70-5-25. This alloy is recommended highly for high-speed bearings at light loads. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-470. Producer or source: Copper alloy foundries.

Effect of Ce on Vitriol Corrosion Resistance of Aluminum Bronze Alloy Coatings

2010 ◽  
Vol 148-149 ◽  
pp. 715-720
Author(s):  
Huai Zhi Wang ◽  
Zhi Ping Wang ◽  
Yang Lu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Alloy Coating ◽  
Aluminum Bronze ◽  
H2so4 Solution ◽  
Bronze Alloy ◽  
Good Corrosion Resistance ◽  
Selective Corrosion

The effect of Ce on vitriol corrosion resistance of aluminum bronze alloy coating was studied by static immersing corrosion test, electrochemistry test, XRD, SEM, EPMA, XPS et al. The results show that Ce can improve the corrosion resistance of Cu-14%Al-X coastings. Selective corrosion happened in 5%H2SO4 solution and Al and Fe were prior to be etched. This alloy coatings possesses good corrosion resistance.

Ultra-High-Speed Performance of Ball Bearings and Annular Seals in Liquid Hydrogen at Up to 3 Million DN (120,000 rpm)©

2004 ◽  
Vol 47 (1) ◽  
pp. 43-53 ◽  
Author(s):  
MASATAKA NOSAKA ◽  
SATOSHI TAKADA ◽  
MASATAKA KIKUCHI ◽  
TAKAYUKI SUDO ◽  
MAKOTO YOSHIDA
Keyword(s):  
High Speed ◽  
Liquid Hydrogen ◽  
Ball Bearings ◽  
Ultra High Speed ◽  
Speed Performance ◽  
Annular Seals

scholarly journals Operating Limitations of High-Speed Jet-Lubricated Ball Bearings

1976 ◽  
Vol 98 (1) ◽  
pp. 32-39 ◽  
Author(s):  
E. V. Zaretsky ◽  
H. Signer ◽  
E. N. Bamberger
Keyword(s):  
Contact Angle ◽  
Flow Rate ◽  
Parametric Study ◽  
High Speed ◽  
Ball Bearings ◽  
Test Results ◽  
Outer Race ◽  
Lubricant Flow ◽  
Thrust Load ◽  
Inner Race

A parametric study was performed with 120-mm bore angular-contact ball bearings having a nominal contact angle of 20 deg. The bearings either had an inner- or an outer-race land riding cage. Lubrication was by recirculating oil jets. The oil jets either had a single or dual orifice. Thrust load, speed, and lubricant flow rate were varied. Test results were compared with those previously reported and obtained from bearings of the same design which were under-race lubricated but run under the same conditions. Jet lubricated ball bearings were limited to speeds less than 2.5 × 106 DN. Bearings having inner-race land riding cages produced lower temperatures than bearings with outer-race land riding cages. For a given lubricant flow rate dual orifice jets produced lower bearing temperatures than single orifice jets. However, under-race lubrication produced under all conditions of operation lower bearing temperatures with no apparent bearing speed limitation.

Minimum Load Requirements for the Prevention of Skidding in High Speed Thrust Loaded Ball Bearings

1981 ◽  
Vol 103 (1) ◽  
pp. 35-39 ◽  
Author(s):  
R. J. Boness
Keyword(s):  
Experimental Evidence ◽  
Excellent Agreement ◽  
High Speed ◽  
Empirical Equation ◽  
Ball Bearings ◽  
Thrust Load

This paper describes the development of an empirical equation used to determine the minimum thrust load that is required to prevent gross ball and cage skidding in high speed angular contact bearings. Based on extensive computer results the equation is shown to give excellent agreement with existing experimental evidence.

scholarly journals Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen

2010 ◽  
Vol 5 (2) ◽  
pp. 71-79 ◽  
Author(s):  
Masataka Nosaka ◽  
Satoshi Takada ◽  
Makoto Yoshida ◽  
Masataka Kikuchi ◽  
Takayuki Sudo ◽  
...  
Keyword(s):  
High Speed ◽  
Liquid Hydrogen ◽  
Ball Bearings

COPPER ALLOY No. C84200

Alloy Digest ◽  
1982 ◽  
Vol 31 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Lead Alloy ◽  
Good Resistance ◽  
Copper Zinc ◽  
Pipe Fittings ◽  
Strength And Ductility

Abstract Copper Alloy No. C84200 is a free-cutting copper-zinc-tin-lead alloy. It is characterized by good casting properties, moderate strength and ductility, good machinability and good resistance to corrosion. Formerly used named (not recommended) are 101, Leaded Semi-Red Brass and 80-5-2.5-12.5. Typical applications are pipe fittings, bushings, locknuts and unions. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-446. Producer or source: Copper alloy foundries. See also Alloy Digest Cu-450, December 1982.

Sign in / Sign up

Export Citation Format

Share Document