# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DeE4p2ZAsdJ
- **Gondola URL:** https://gondola.cc/posts/71427947-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/9215f839e2.jpg
- **Posted:** 2026-10-04T14:56:48.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

A single sheet of silver becomes a teapot through hours of hammering, heating, and patience. No casting, no machining. Just metallurgy controlled by hand.

The process is called raising, and every step is materials science in action:

- Sterling silver is 92.5% silver and 7.5% copper. Pure silver is too soft for functional ware, so copper is added as a solid-solution and precipitation strengthener.
- Each hammer blow plastically deforms the metal, multiplying dislocations in the crystal lattice. As dislocations tangle, the silver becomes harder and more brittle. This is work hardening.
- Before the sheet cracks, the craftsman anneals it at roughly 650 C. The heat lets new, strain-free grains nucleate and grow (recrystallization), restoring ductility so hammering can continue.
- This hammer, anneal, repeat cycle can happen dozens of times as a flat disc is drawn up over steel stakes into a hollow body.

Then comes planishing: thousands of light, overlapping blows with a polished hammer that smooth the surface and leave a final layer of work-hardened, stiffer metal.

Joining the spout, handle, and base uses a sequence of hard, medium, and easy silver solders. Each melts at a progressively lower temperature, so earlier joints stay solid while new ones flow.

Heating sterling also creates firescale, where oxygen diffuses into the surface and oxidizes the copper. Silversmiths must pickle, file, or plate over it to keep that bright finish.

There is also a thermal problem. Silver has the highest thermal conductivity of any metal, around 429 W/m-K. A teapot full of near-boiling water would make a metal handle painful to hold, which is why classic designs use wood or ivory insulators between handle and body.

A silver teapot is a lesson in dislocation theory, phase behavior, and heat transfer, made with a hammer.

#stemantics #materialsscience #metallurgy #silversmithing #engineering

## Stats

- **Views:** 12,797
- **Likes:** 164
- **Shares:** 0
- **Comments:** 2

## Tags

engineering, materialsscience, silversmithing, stemantics, metallurgy

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