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PTFE Disc: Sintered in a Molten Nitrate Bath, Cooled Slowly (Brubaker & Hanford 1946)
A PTFE disc pressed cold, then sintered by dipping it in molten salt at 380 °C for half an hour. Instead of being quenched, it cools slowly between magnesite blocks. The patent says slowly cooled pieces are a little softer and less stiff, which is often better for machining.
Source: M. M. Brubaker and W. E. Hanford (du Pont), US 2,400,099 (1946), Example II. The patent gives no nitrate-to-nitrite ratio. The mould, press, pot and burner are ours. Picture drawn by Youblob.
Abantado
1 day
Mga Tagubilin
1
1
Press a disc at 500 psi
Press a disc at 500 psi
At 25 °C, press PTFE powder at 500 lb/sq in into a disc 2 in across and ⅜ in thick.
Mga materyales para sa hakbang na ito:
Pulbos ng PTFE na resina1 as required for the discMga kailangang kasangkapan:
Molde para sa compression molding
Haydroliko na pandiin
Ruler2
2
Melt the salt bath at 380 °C
Melt the salt bath at 380 °C
Melt a mixture of sodium nitrate and sodium nitrite and hold it at 380 °C. The patent gives no ratio. Ours: a cast iron pot on a gas burner.
Mga kailangang kasangkapan:
Salitre ng Chile (sodium nitrate)
Nitritong sodyo
Kaldero na kaeng bakal
Sulo na de-gas
Thermocouple na may basahan3
3
Dip the disc for half an hour
Dip the disc for half an hour
Lower the pressed disc into the molten bath and leave it there for ½ hour.
Mga kailangang kasangkapan:
SipitKaldero na kaeng bakalThermocouple na may basahan4
4
Cool it slowly between magnesite blocks
Cool it slowly between magnesite blocks
Take the disc out and lay it between two magnesite blocks so it cools to room temperature over 1 hour. It comes out tough and even, close to its pressed shape.
Mga kailangang kasangkapan:
Sipit
Mga bloke ng magnesiteMga Materyales
1- 1 as required for the discPlaceholder
Mga Kinakailangang Kasangkapan
10- Placeholder
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Ang blueprint na ito ay gumagawa ng
Kaugnay na Blueprint
Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo
PTFE Resin Powder: Tetrafluoroethylene Polymerised under Pressure, Plunkett 1941
ni Charlie
Industriyal
11
0
0
0
0
0
PTFE Ring: Pressed Cold, Sintered Out of the Mould (Brubaker & Hanford 1946)
ni Emma
Paggawa sa Plastik
14
0
0
0
0
0
PTFE Rod: a Plug Sintered in Boiling Retene Vapour (Brubaker & Hanford 1946)
ni Emma
Paggawa sa Plastik
12
0
0
0
0
0
CC0 Pampublikong Domain
Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.
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