Spherical Preforms

Coining Spheres
Coining spherical preforms are precise, spherically shaped joining components formed from specially alloyed materials. They are used instead of more conventional flat preforms when either: 1) the part geometries surrounding the preform are better joined using a spherical shape rather than a flat shape, or 2) the alloys involved are not capable of being stamped into a flat shape.

Features

• Accurate diameters

• Bright and shiny surface finishes

• Highly spherical shapes

• With or without flux

• Made from pure metal, combined to produce exact alloy compositions

Typical Alloys
The alloys most commonly requested by Coining customers are listed below. Please contact us for other available alloys. Purities are typically 99.99%. Higher purities may be available upon request.

	Melting Point (C):	Melting Point (C):	Melting Point (C):
	Eutectic	Solidus	Liquidus
100Sn	232
95Pb5Sb		235	240
80Au20Sn	278
95Bi5Sb		282	312
72Ag28Cu	779
Pure Ag	961
Pure Au	1063

Typical Diameters
Coining can easily manufacture spherical preforms in diameters ranging from 0.020" (0.50mm) to 0.080" (2.0mm). Tolerances by weight are typically +/- 5%. Please contact us for specifics and availability of other sizes.

Packaging
Various packaging options are available based on customer needs. Non-contact desiccant is used as required. An inert argon atmosphere is available on request.