Room and elevated temperature strength of perovskite membrane tubes

Nagabhushana, Nagendra; Bandopadhyay, Sukumar

doi:10.1016/s0955-2219(02)00367-9

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…The construction of SPT diagram requires Weibull parameters. Because we only have the Weibull parameters of this material in a C‐ring shape, 21 we need to use “effective volume” 22 to derive the equivalent characteristic stress for the four‐point bending specimens.…”

Section: Resultsmentioning

confidence: 99%

“…At 1000°C and N 2 /air, the characteristic strength of the four‐point bending samples, σ 0 , is 97.0 MPa, as discussed above. The Weibull modulus m is 4.8 21 . The tests were carried out by monotonically loading in diametral compression to fracture at a constant cross‐head speed of 0.5 mm/min 21 .…”

Section: Resultsmentioning

confidence: 99%

“…The tests were carried out by monotonically loading in diametral compression to fracture at a constant cross‐head speed of 0.5 mm/min 21 . The basic steps of construction of the SPT diagrams for the samples at high temperature and reactive environment are as follows: (i) The strain rate is estimated as 0.5 mm/5.75 mm/min=1.5 × 10 −3 s −1 where 5.75 mm is outer diameter of the C‐ring 21 . (ii) The corresponding stress rate, , is calculated as 123 GPa × 1.5 × 10 −3 =184.5 MPa/s, where 123 GPa refers to the assumed Young's modulus 23 .…”

Section: Resultsmentioning

confidence: 99%

“…(iii) Combination of this stress and 1− F =1/ e (corresponding to the characteristic strength σ 0 ), where F is failure probability, gives the first data point on the 1 s line on the SPT diagram. (iv) Draw the 1 s line with a slope of Weibull parameter 4.8 21 . (v) A series of lines parallel to this line, with a spacing between the lines equal to (Ln10)/ n or 2.3/ n .…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Nagabhushana

Nithyanantham

Bandopadhyay

et al. 2011

Int J Applied Ceramic Tech

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We herein report subcritical crack growth (SCG) studies of La 0.2 Sr 0.8 Fe 0.8 Cr 0.2 O 3Àd (LSFCO) perovskite membranes as oxygen transport membranes (OTM). Two sample batches of perovskite were tested to investigate the effect of temperature, specific chemical environments, and loading rate on flexure strengths, using four-point bend tests. The first batch was examined at room temperature in air. The second batch was soaked in an N 2 /air atmosphere at 10001C. Stress rates varied approximately from 0.2 to 90 MPa/s. The strength-probability-time diagram is constructed for design proposes. Flexural strength data indicate that the examined OTM material showed little susceptibility to SCG at room temperature in air. However, the sample is susceptible to SCG in an N 2 /air environment at 10001C. Also, the experiments demonstrate flexuralstrength rate dependency, with strength increasing with the stress rate. The observed phenomena are explained by the decomposition and microstructural transitions in the perovskite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Nagabhushana

Nithyanantham

Bandopadhyay

et al. 2011

Int J Applied Ceramic Tech

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“…20), resulting into change in conductivity [184]. The mechanical properties (elastic modulus, fracture toughness, fracture strength, and Weibull modulus) of doped lanthanum chromite tend to vary with different dopant type and level at OTM operating conditions (1000°C and 0.21-10 -22 atm) as shown in Table 6 [110,155,[193][194][195][196][197]. It is observed that the flexure strength of the material increases with increase in the level of A-site dopants (Sr and Ca) due to enhanced densification [110,193] [193].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Lanthanum chromite based perovskites for oxygen transport membrane

Gupta

Mahapatra

Singh

2015

Materials Science and Engineering: R: Reports

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Judicious selection of mixed ionic-electronic conducting (MIEC) perovskite oxide as oxygen transport membrane (OTM) offers the potential to enhance overall process economics and systems performance for a wide variety of industrial applications ranging from clean and efficient energy conversion (oxy-combustion) to selective gas separation (high purity oxygen production) and value added chemicals (syngas and liquid fuel) production with near-zero greenhouse gas emissions. Doped lanthanum chromite perovskites have been considered as promising material of choice for oxygen transport membrane (OTM) due to their superior thermo-chemical stability in aggressive environment (800-1000°C, 0.21-10-20) than the other mixed ionic-electronic conducting (MIEC) perovskites such as ferrites and cobaltite's. Thermo-physical properties of the lanthanum chromite, required for optimum oxygen transport can be tuned by modifying the crystal structure, chemical

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Catalytic Membrane Reactors

Dittmeyer

Caro

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Types of Membrane Reactor Catalytic Reactors with Hydrogen‐Selective Membranes Membrane Types Organic Polymers Solid Polymer Electrolytes Metals Microporous Membranes Ceramic Proton Conductors and Cermets Final Remarks Selective Removal of Hydrogen Dehydrogenation A Hydrocarbons B Alcohols Water Gas Shift Reaction Reforming A Packed‐Bed Membrane Reformers B Fluidized‐Bed Membrane Reformers C Microstructured Membrane Reformers D Techno‐Economic Evaluation Selective Supply of Hydrogen Hydrogenation Hydroxylation by In‐Situ H 2 O 2 Formation Perspectives Reactors with Oxygen‐Selective Membranes Membrane Types Mixed Oxygen‐Ion‐ and Electron‐Conducting Membranes Solid Electrolytes for Electrochemical Operation Membranes for Selective Removal of Oxygenates Pore Membranes for Non‐Selective Oxygen Feeding Selective Supply of Oxygen Production of Pure Oxygen and of Oxygen‐Enriched Air Partial Oxidation of Methane to Synthesis Gas Oxidative Dehydrogenation of Light Alkanes to Olefins Oxidative Coupling of Methane to C 2 ‐Hydrocarbons Solid Electrolyte Membrane Reactors Perspectives Catalytic Reactors with Non‐Selective Membranes Distributed Feeding through Membranes Catalytic Membrane Contactors Gas–Liquid Applications Liquid–Liquid Applications Gas–Gas Applications Perspectives Design of Catalytic Membrane Modules Novel Inorganic Membrane Supports High‐Temperature Membrane Reactor Design Concluding Remarks

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Room and elevated temperature strength of perovskite membrane tubes

Cited by 14 publications

References 18 publications

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Lanthanum chromite based perovskites for oxygen transport membrane

Catalytic Membrane Reactors

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