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Yttrium: Fluoride Reduced with Calcium and Magnesium at 1000 °C, then Distilled to Sponge (Carlson, Schmidt and Spedding, US 2,950,962)

أنشأه

Charlie

1. نوفمبر 2026

Yttrium: Fluoride Reduced with Calcium and Magnesium at 1000 °C, then Distilled to Sponge (Carlson, Schmidt and Spedding, US 2,950,962)

Calcium alone reduces yttrium fluoride only at 1500 °C. Adding magnesium makes a low-melting yttrium-magnesium alloy, and calcium chloride thins the slag, so the job runs at about 1000 °C. The magnesium and calcium are then boiled off in vacuum, leaving yttrium sponge. Result: yttrium sponge (yield 98-99 % in the alloy step), usable as a getter or remelted to an ingot. Source: O. N. Carlson, F. A. Schmidt and F. H. Spedding, US 2,950,962 (1960). Hot work under argon; calcium reacts with water. Picture drawn by Youblob.

متقدم

2 days

التعليمات

Weigh and mix the charge

Dry the calcium chloride in vacuum at about 550 °C. Mix thoroughly 2600 g of pure, fine yttrium fluoride, 2090 g of calcium chloride, 1285 g of granular calcium (about 20 % excess) and 395 g of magnesium turnings, and pack it into a zirconium crucible with a lid carrying a pressure-release valve.

المواد لهذه الخطوة:

فلوريد الإتريوم1 2600 g

الأدوات المطلوبة:

كالسيوم

مغنيسيوم

كلوريد الكالسيوم

مضخة تفريغ

بوتقة زركونيوم

Reduce at about 1000 °C

Under argon (or helium) at about atmospheric pressure, set the crucible in a furnace already at 950-1050 °C and keep heating for about half an hour; the reaction gives off little heat. An yttrium-magnesium-calcium alloy forms under a calcium fluoride-calcium chloride slag.

الأدوات المطلوبة:

بوتقة زركونيوم

فرن البوتقة

أرغون

Separate alloy and slag

Take the retort out and tilt it about 15° from horizontal so the slag and alloy freeze in thin layers along the side wall, then break them apart. The alloy is brittle (typically 19 % magnesium, 7-8 % calcium). Crush it to pieces of about 1/2 in.

الأدوات المطلوبة:

بوتقة زركونيوم

هاون ومِدَقّ

Boil off magnesium and calcium in vacuum

Pack the pieces in a crucible of the same metal set in a graphite heater inside a quartz tube. Pump down to about 1 micron or less and heat by induction to about 800 °C, then more slowly to 1100 °C (about three hours). The alloy does not melt; magnesium and calcium distil away (about 27 % weight loss), leaving porous yttrium sponge.

الأدوات المطلوبة:

بوتقة زركونيوم

بوتقة غرافيت

أنبوب كوارتز منصهر

مضخة تفريغ

فرن حثّي

Remelt to an ingot (optional)

Use the sponge as it is (for example as a getter in vacuum tubes), or remelt it in a consumable arc furnace under helium or vacuum to get a solid ingot.

الأدوات المطلوبة: