Glass containing tantalum

Hydrogen chloride gas may be stored in steel cyhnders free of contaminants. Monel, pure nickel, or its aUoy, inconel, may also be used for storage and transportation up to 500°C. Hydrochloric acid may be stored in glass bottles or in containers made up of tantalum or tantalum-molybdenum alloys, or other alloys of zirconium, molybdenum, and tungsten. 

The physical properties of tantalum are similar to those of mild steel, with the exception that its melting point (2996°C) is much higher. It is ordinarily used in the pure form, and it is readily fabricated into many different shapes. The corrosion-resistance properties of tantalum resemble those of glass. The metal is attacked by hydrofluoric acid, by hot concentrated alkalies, and by materials containing free sulfur trioxide. It is resistant to all other acids and is often used for equipment involving contact with hydrochloric acid. 

The self-healing process, of 2 cm of BPO confined in the glass closed coll, covered with a tantalum small lube flange containing the themiocoupie to measure the temperature of BPO, and subjected to the adiabatic self-heating test started from a 7j near 81 C, recorded in temperature increments of 3 K. from the 7,. 

The glass closed cell covered with the tantalum small tube flange, in which the thermocouple to measure the temperature of BPO is contained. 

Fig. 2. Some tantalum seals and apparatus. (A) Crimped and welded (B) capped and welded (C) apparatus for biphasic, isopiestic equilibrations (D) thermal analysis container (E) tantalum tube to be welded under vacuum [tube is brazed to metal-to-glass seal and closed with joint and stopcock at top) not shown)] (F) sublimation container with reservoir or condenser swaged or flared to fit (G) reaction container sealed in silica jacket under vacuum.

Use of the evacuated apparatus (style E) may improve some transport reaction rates. The tantalum portion is attached to a glass joint and stopcock by a brazed metal-to-glass seal. The flat part can be produced by a pair of vise blocks which are driven together by tightening bolts through them while the apparatus is attached to the vacuum line. The evacuated and closed container is then welded from the side at the flat portion and cut off above the weld. The same blocks may be utilized within the dry box instead of a vise. 

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