Über die Pyrophorität von Metallpulvern

Thammann, G.; Nikitin, N.

doi:10.1002/zaac.19241350116

Cited by 11 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pyrophoric iron results from reduction at any temperature below 530° C, according to Tammann and Nikitin [10], and even up to 710° C, according to Smits and Wallagh [14]; but the tendency towards pyrophoric behavior can be overcome by heating the reduced iron to still higher temperatures.…”

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

“…The reduction of iron oxide by hydrogen begins at low temp eratures, about 370 0 C according to Tammann and Nikitin [10] and only a little above 300 0 C according to Kamura [11], but at these temperatures the reaction proceeds slowly and is difficult to carry to completion. The rate of the reaction increases with increasing temperature until an optimum temperature for rapid and complete reduction is reached, between 500 0 and 600° C [ll, 12,13].…”

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of high-purity iron

Thompson¹,

Cleaves²

1939

J. RES. NATL. BUR. STAN.

View full text Add to dashboard Cite

Iron of high purity, in the form of 1-lb ingots, has been prepared by reducing purified iron oxide to sponge iron, melting the sponge iron, and remelting under hydrogen and in vacuo. The ingots were examined by spectroscopic and chemical methods for the presence of 55 possible impurities; the number of impurities that could be identified in individual ingots ranges from 6 to 9. The total of impurities in each ingot in most cases is less than 0.010 percent. The major impurities are nonmetallic, chiefly oxygen and sulfur, with traces of carbon, phosphorus, nitrogen, and hydrogen. Copper is the only metallic impurity in seven of the ingots; others contain small amounts of silicon and occasional traces of aluminum or beryllium from the refractories.

show abstract

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

Preparation of high-purity iron

Thompson¹,

Cleaves²

1939

J. RES. NATL. BUR. STAN.

View full text Add to dashboard Cite

show abstract

Die Konstitution der Metallkomplexe des Indigos

Kühn

Machemer

1928

Ber. dtsch. Chem. Ges. A/B

View full text Add to dashboard Cite

I 18 K u h n , M n c h e m e r : Die Konstitution [Jahrg. 61 und besitzt einen bitteren Geschmack. Durch partielle Verseifung in saureni Medium erhalt man die Mono-aceton-Verbindung. 4.493 iiig Sbst.: 10.01 ing CO,, 3.65 nig H,O. C,,H,,O, (~I G . I~) . Bcr. C 61.06, I3 9.33. C:c.f. C 60.75, I1 9.09D is c hw e f lig s a u r e -e s t e r des P e n t a e r J-t h r i t s ( 1 1 7 . ) .Man kocht feinst pulverisierten Pentaerythrit z Stdn. am IiiickfluBkiihler mit 'I'hionylchlorid. Es tritt allmahliche Liisung ein, und beim Abkiihleri scheidet sich der Di-ester vom Schmp. I53 -154O in schiinen Krystallen aus, deren Eigenschaften bereits in der Literatur beschrieben sind.

show abstract

Über pyrophores Eisen

Feitknecht

Durtschi

1964

Helvetica Chimica Acta

View full text Add to dashboard Cite

If iron oxides are reduced at temperatures ranging from 300° to 500°C, Fe3O4, is first formed, if not already present, and this goes directly over into iron. The nucleation of iron is slow, and if the oxide is finely crystalline, the iron nuclei grow by diffusion of iron atoms from many oxide crystals already at a temperature of approximately 300°C. The iron crystals sinter together to form irregular secondary particles. ‐ Responsible for the pyrophorous behaviour is the specific surface. Self‐ignition occurs when this surface is greater than approximately 3 m2/g. Pyrophorous iron can be inactivated with a mixture of N2 low in 02, an oxide layer being formed approximately 13 Å, i.e. ca. 6 02−‐layers, thick. An estimation of the heat produced on forming this layer and of the resulting temperature increase leads to a value which is in agreement with the ignition temperature of inactivated iron powder with a specific surface of approx. 3 m2/g.

show abstract

Über die Pyrophorität von Metallpulvern

Cited by 11 publications

References 3 publications

Preparation of high-purity iron

Preparation of high-purity iron

Die Konstitution der Metallkomplexe des Indigos

Über pyrophores Eisen

Contact Info

Product

Resources

About