It's my opinion that your nickel's condition was caused by post-mint exposure to harsh environmental agents--as opposed to a planchet made via the sintering process.
Sintering -- "Sintering happens naturally in mineral deposits or as a manufacturing process used with metals, ceramics, plastics, and other materials. The atoms in the materials diffuse across the boundaries of the particles, fusing the particles together and creating one solid piece. Because the sintering temperature does not have to reach the melting point of the material, sintering is often chosen as the shaping process for materials with extremely high melting points such as tungsten and molybdenum." [wikipedia]
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