Casting Bi-Metal Babbitt 2

[act1]

Cannot locate solidification shrinkage data for ASTM B23 Alloy 2 [Tin base] Babbitt. Does anyone have a quick resource or better yet..value. We static cast due to config. and want properly sized riser for new component [big - lots of babbitt].

 

[unclesyd]

You need to contact these folks. They used to be very good with information.

http://www.belmontmetals.com/main/index.cfm

 

[metengr]

If you can't obtain the shrinkage data, there is another option. You can use the information below to approximate volumetric or linear shrinkage for casting the babbit.

ASTM A 23 Type 2 babbit contains 88-90% tin, 7-8% antinomy, 3-4% Copper and less than 0.35% lead.

The following information was obtained from several sources that I have;

For pure tin, linear shrinkage is 0.6%, volumetric shrinkage is 1.2%

For copper, linear shrinkage is 2%, volumetric shrinkage is 7%.

I don't have specific data for antimony. Using the laws of mixtures, you can take for (tin) 0.9* shrinkage % + (copper)0.035 * shrinkage % and for antimony use a value similar to tin (0.075* shrinkage for tin) = shrinkage % for babbit.

 

[unclesyd]

metengr{,
Off Topic:
Some interesting papers.

http://www.lambda-research.com/publica.htm

http://www.surfaceenhancement.com/techpapers.htm

act1,
Finding all type of information on casting and working babbitt from my father's books but no numbers. The comments in instructions are to use adequate material to allow for shrinkage.