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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.
高级
1 day
说明
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.
此步骤所需材料：
PTFE 树脂粉1 as required for the disc所需工具：
模压模具
液压机
直尺2
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.
所需工具：
智利硝石（硝酸钠）
亚硝酸钠
铸铁锅
燃气灯
带读数的热电偶3
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.
所需工具：
火钳铸铁锅带读数的热电偶4
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.
所需工具：
火钳
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