DECHEMA

About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.

Ergebnisse von Untersuchungen zur Bauteilzähigkeit

Abstract: Die Untersuchungen an Modellbehaltern aus Kesselblechen und aus Tieftemperaturstahl, uber die in fruheren Veroffentlichungen schon berichtet worden ist, werden abschliesend ausgewertet und zu den Werkstoffeigenschaften in Beziehung gesetzt. Dabei ergibt sich, das fur das Berstverhalten der Behalter (Bauteilzahigkeit) Bereiche unterschieden werden konnen, fur die gangige Werkstoffkennwerte (Risauffangtemperatur und Kerbschlagubergangstemperatur) charakteristische Grenzwerte darstellen. So erhalt der Anwender einen Uberblick uber die zu erwartenden Bruchformen. Results of tests on structural member toughness. A final evaluation is made of measurements on model vessels of boiler plate and of low temperature steel. These measurements had been the subject of former publications, and are correlated with the properties of the respective materials. It results thereof that, with respect to the bursting behaviour of the vessels (toughness of structural member), certain regions can be defined where materials property data (crack arrest temperature according to Robertson and impact transition temperature) represent characteristic values. The user is thus able to assess the types of fracture to be expected.

Modeling and evaluation of DeNOx photocatalysts under real world conditions

Abstract: Photocatalytically active building materials can contribute to better air quality by mineralizing the hazardous nitrogen oxides to nitrate. Evaluation of these materials is very important for optimization and implementation at target sites. However, the currently widely used ISO 22917-1:2016 test is unsuitable to estimate the effect on real scenarios since it employs too high concentrations and only evaluates the NO oxidation potential, completely ignoring the more relevant NO2. Herein, we present a methodology to better simulate the real-world performance of these materials based on its effect on the ternary mixture NO/NO2/O3 under environmentally relevant concentrations, which can also be simulated by means of kinetic analysis of experimentally less complex single component measurements. From this, a new figure of merit - the trend value - is derived to rate the materials' performance.

Observations on material behaviour in a pilot plant for the gasification of organic waste

Abstract: A pilot plant with a revolving cylindrical furnace for the gasification of organic waste at temperatures between 600 and 800°C was operated in 1976/78. The furnace wall was made of a 25 Cr/20 Ni steel. After 3000 h operation the total damage by external and internal corrosion was about 1.0 to 1.2 mm. The carbon black layer, deposited on the inner furnace wall, obviously acts as a barrier layer. Untersuchungen zum Werkstoffverhalten in einer Pilotanlage zur Vergasung organischer Abfalle Eine Versuchsanlage mit einem Drehrohrofen fur die Pyrolyse von organischen Abfallen bei Temperaturen zwischen etwa 600 und 800°C wurde 1976/78 betrieben. Das Drehrohr war aus einem 25 Cr/20 Ni-Stahl gefertigt. Nach 3000 h Betriebsstunden betrug di gesamte Schadigungstiefe durch ausere und innere Korrosion etwa 1,0 bis 1,2 mm. Die Russchicht, die sich auf der Innenseite des Drehrohrs bildet, wirkt offensichtlich als Barriere.