SENI
KECANTIKAN & KESEHATAN
KERAJINAN
BUDAYA & SEJARAH
HIBURAN
LINGKUNGAN
MAKANAN & MINUMAN
REKAYASA BALIK
ILMU PENGETAHUAN
OLAHRAGA
TEKNOLOGI
PERANGKAT PAKAI
PTFE (Polytetrafluoroethylene)
On 6. April 1938 Roy Plunkett at DuPont opened the valve on a cylinder of tetrafluoroethylene gas, a candidate refrigerant, and nothing came out - though the cylinder still weighed full. Sawn open, it held a white waxy powder: the gas had polymerised by itself. The powder resisted every solvent and acid tried on it, did not melt like other plastics, and almost nothing would stick to it.
**US 2,230,654**, "Tetrafluoroethylene polymers", Plunkett, assigned to Kinetic Chemicals, granted 4. February 1941. Its first claim is two words: "Polymerized tetrafluoroethylene."
**Tetrafluoroethylene is explosive and is never handled outside a plant.** You build what the material is for: a hinged tilting ramp that measures the coefficient of friction of PTFE against steel, beside nylon, acrylic and steel itself.
Pemula
3 hours
Instruksi
1
1
The rig
The rig
The whole rig: a 400 mm base, a hinged ramp with a steel strip on top, a prop under the raised end, and a faced sled.
2
2
Cut base and ramp
Cut base and ramp
From 18 mm plywood saw two boards 400 x 120 mm. Sand the edges.
Material untuk langkah ini:
Lembaran kayu lapis1 buahAlat yang dibutuhkan:
Gergaji Tangan
Penggaris Baja
Klem C3
3
Hinge them
Hinge them
Lay the boards end to end and fit the butt hinge across one short joint with 4 wood screws, pilot-drilled 2 mm. The ramp must lift from flat to 45° without rocking.
Material untuk langkah ini:
Engsel daun1 buah
Sekrup kayu4 buahAlat yang dibutuhkan:
Bor Tanpa Kabel
Set mata bor dalam kotak
Set obeng4
4
Fit the steel counterface
Fit the steel counterface
Stick a 360 x 100 mm strip of mild steel sheet to the ramp's top face with double-sided tape. Wipe it with isopropyl alcohol - grease halves any reading.
Material untuk langkah ini:
Pelat Baja Lunak1 buah
Pita perekat dua sisi1 gulung
Alkohol Isopropil 99 %10 mlAlat yang dibutuhkan:
Kacamata Pengaman Bening5
5
Make four sleds
Make four sleds
Saw four 60 x 60 mm plywood blocks. Face one each with PTFE, nylon, acrylic and steel cut to 60 x 60 mm, fixed with double-sided tape. Clean every face with alcohol.
Material untuk langkah ini:
Lembaran PTFE1 buah
Lembaran nilon (6/6)1 buah
Lembaran Akrilik1 buahPelat Baja Lunak1 buahPita perekat dua sisi1 gulungAlat yang dibutuhkan:
Gergaji Tangan
Pisau kater6
6
Tilt until it goes
Tilt until it goes
Set a sled 100 mm from the top. Raise the ramp slowly, about 1° per second. Stop the instant it slides and read the angle finder on the ramp. Five tries per sled.
Alat yang dibutuhkan:
Busur Derajat / Pengukur SudutPenggaris Baja7
7
Load it
Load it
Repeat the PTFE sled with a weight taped on top. The angle should not change.
Alat yang dibutuhkan:
PemberatBusur Derajat / Pengukur Sudut8
8
Angles into friction
Angles into friction
Memuat notebook Jupyter…
9
9
History & Context
History & Context
**What the patent specifies:** the polymer of tetrafluoroethylene itself, a solid insoluble in ordinary solvents. **Modern build (derived):** machined PTFE sheet against clean mild steel on a tilting plane.
Its first large use was seals and gaskets for the Manhattan Project's uranium hexafluoride plant, a gas that attacked everything else. DuPont registered Teflon in 1945; non-stick pans followed in the 1950s, and stretched PTFE became Gore-Tex. Its limits: it creeps under steady load, wears quickly without fillers, cannot be glued without etching, and above about 260 °C in use it begins to give off harmful fumes.
Bahan
9- 1 buahPlaceholder
- Engsel daunkomisi 10%1 buahPlaceholder
- 4 buahPlaceholder
- 1 buahPlaceholder
- 1 gulungPlaceholder
- Placeholder
- 1 buahPlaceholder
- 1 buahPlaceholder
- 1 buahPlaceholder
Alat yang Diperlukan
10- Placeholder
- Placeholder
- Placeholder
- 1 vendor sell this, none ship to you yetPlaceholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Berkas desain
1Blueprint terkait
Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip
CC0 Domain Publik
Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.
Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.