The effect of Y and Ti on FeCrAl oxidation at 1400 C
نویسندگان
چکیده
Inco alloy MA956 (Fe-20wt%Cr-4.5%Al-0.35%Ti + 3~01% Y203-A1203) was oxidized in 1 atm of dry, flowing O2 at 1400 OC. Good scale-metal adhesion was observed. Some spalling occurred upon cooling, but it remained within the oxide, not through to the bare metal. Cyclic experiments showed good scale adherence. Y was found to segregate to the oxide grain boundaries and by implication to have modified oxidation behavior through a reactive element effect. However, while at lower temperatures Ti was also found to segregate, at 1400 OC very little segregation was detected. Instead, = 0.5 pm TiNI particles were observed in the scale. These particles appear to have cracked the surrounding oxlde during cooldown. It is postulated that the spallation observed was due to these particles. MA956 was compared to Kanthal alloy APM (Fe-2O%Cr-5.5%Al-O.O3%Ti + % 2vol%Zr02-A1203) and a conventionally-cast Fe-20%Cr-lO%Al alloy, in order to study the effect of Y and Ti.
منابع مشابه
بررسی تأثیر ریزساختار بر مقاومت به اکسیداسیون آلیاژ Ti47Al48Mn5 تولید شده به روش آلیاژسازی مکانیکی
The aim of this investigation was to produce Ti47Al48Mn5 intermetallic compounds with different microstructures in order to study their oxidation behavior. The reason for selecting manganese as an alloying element was to enhance the toughness of the compound. Ti47Al48Mn5 alloys were obtained through mechanical alloying, cold pressing and heat treatment. XRD results showed that milling of the el...
متن کاملA strategy for degradation of 2,5-dichlorophenol using its photoelectrocatalytic oxidation on the TiO2/Ti thin film electrode
In this work, the photoelectrocatalytic (PEC) degradation of 2,5-dichlorophenol can be used for its removal from aqueous solution. To study this activity, a TiO2 thin film modified titanium sheet (TiO2/Ti) was fabricated by anodizing Ti plates using a two electrode system under the constant bias voltage of 20 V for 20 min in a solution of 0.2% (v/v) HF followed by calcinat...
متن کاملSYNTHESIS OF MgAl2O4-Ti(C,N) NANOCOMPOSITE BY ALUMINOTHERMIC REDUCTION
MgAl2O4/Ti(C,N) composites were synthesized through aluminothermic reaction between Al,TiO 2,MgO powders and phenolic resin in coke bed condition. Effect of addition of carbon black and sugar into the mixture at different temperatures were investigated. The phases and microstructures of samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). MgAl 2O4 ...
متن کاملPreparation of Ni-based metal monolithic catalysts and a study of their performance in methane reforming with CO2.
A series of Ni/SBA-15/Al(2)O(3)/FeCrAl metal monolithic catalysts with Ni loadings varying between 3 % and 16 % were prepared, and their structure was characterized by various techniques. The catalytic activity of the catalyst for methane reforming with CO(2) leading to synthesis gas was evaluated using a fixed-bed reactor. The results indicate good catalytic activity of the Ni/SBA-15/Al(2)O(3)...
متن کاملEffect of increasing corundum on mechanical properties of silicon carbide refractories
Oxide materials such as Al2O corundum has a great influence on the mechanical and oxidation properties of refractory or refractory materials. In this paper, the effect of Al2O3 powder density, apparent porosity, linear shrinkage, and oxidation resistance of SiC composite refractory materials is investigated. Meanwhile, the compressive and flexural strengths were investigated before and after he...
متن کامل