sintered planchet?

mgoodm3

partagas

Don't know, but dip it. If it is sintered the dip won't do anything. If it is toned, then you have just a dipped quarter.

MrBreeze

Not that you should reward laziness, but I figure you can give me a simple answer. What does "sintered planchet" mean?

LALASD4

Nice pictures. Some people call it that but who knows what it is.

CaptHenway

<< <i>No that you should reward laziness, but I figure you can give me a simple answer. What does "sintered planchet" mean? >>



Thet meens it ain't struk off-sinter............

Leiana

<< <i>Not that you should reward laziness, but I figure you can give me a simple answer. What does "sintered planchet" mean? >>



A sintered planchet is a copper-nickel planchet which was caught in the wash previously used for cent planchets. Copper particles become attached to the copper-nickel planchet during the wash.

-Amanda

CaptHenway

<< <i>Not that you should reward laziness, but I figure you can give me a simple answer. What does "sintered planchet" mean? >>



I think the writer was using the term to indicate heat-damaged, as in a coin struck on a planchet that got stuck in the annealing oven, but I am guessing there.
There used to be a company that made cheap medals using what they called a "sintering" process. Powdered metal with a relatively low melting point was placed between steel dies that were heated to just that melting point, and then squeezed together to fuse the powder. The pieces were rather dull and unattractive, like this coin, but I doubt there is any connection.
Tom D.

mgoodm3

i've seen them labelled as "copper wash" and "improper annealing" in pcgs slabs. i don't know if copper wash is reserved for those that are copper colored.

this one is a little red on the rev

GoldenEyeNumismatics

looks like a pitted die on the reverse

Sunnywood

The term "sintered" refers to metal that has become bonded or fused together by means of a high-temperature heat treatment. What is really meant here is that after the three-layer cold-clad sandwich strip is blanked into the round discs or planchets, those discs are then washed to remove any metallic dust or grit arising from burring in the blanking process. Some of that metal dust is of course primarily copper, which is the middle layer of the sandwich (as opposed to the outer layers which are a copper-nickel alloy designed to give the coin a silver color at low cost). After washing, the planchets are annealed - that is, heated to a high temperature in a non-oxidizing atmosphere for the purpose of softening the metal and removing the work-hardening that was imparted during cold-cladding and blanking. However, during the annealing process, if there is copper particulate present, it will become fused ("sintered") to the planchet surfaces. Later, when the coin is struck, these soft copper particles will be crushed into the coin's surfaces, resulting in the appearance of a speckled copper wash.

Thus, it is not really correct to describe this as a "sintered planchet." It is more correctly described as a planchet with copper particles unintentionally sintered to its outer surfaces during the annealing process.

Best,
Sunnywood