scholarly journals Phase Formation and the Electrical Properties of YSZ/rGO Composite Ceramics Sintered Using Silicon Carbide Powder Bed

2021 ◽  
Vol 12 (1) ◽  
pp. 190
Author(s):  
Artem Glukharev ◽  
Oleg Glumov ◽  
Ivan Smirnov ◽  
Evgeniy Boltynjuk ◽  
Olga Kurapova ◽  
...  
Keyword(s):  
Ceramic Matrix Composite ◽  
Graphite Powder ◽  
Carbide Powder ◽  
Oxide Ceramic ◽  
Stabilized Zirconia ◽  
Suitable Alternative ◽  
Powder Bed ◽  
Composite Fabrication ◽  
Conventional Sintering ◽  
Developing Area

Fully stabilized zirconia/graphene composites are very promising advanced structural materials having mixed ion–electron conductivity for energy storage and energy conversion applications. The existing methods of the composite manufacturing have a number of disadvantages that limit their practical use. Thus, the search for new sintering methods is an actively developing area. In this work, we report for the first time the application of the SiC powder bed sintering technique for fully stabilized zirconia (YSZ) composite fabrication. The reduced graphene oxide (rGO) was used as a graphene derivative. As a result, well-formed ceramics with high density and crystallinity, the maximal microhardness of 13 GPa and the values of the ionic conductivity up to 10−2 S/cm at 650 °C was obtained. The effects of the sintering conditions and rGO concentration on the microstructure and conductivities of ceramics are discussed in detail. The suggested powder bed sintering technique in a layered graphite/SiC/graphite powder bed allowed well-formed dense YSZ/rGO ceramics fabrication and can become a suitable alternative to existing methods for various oxide ceramic matrix composite fabrication: both conventional sintering and non-equilibrium (SPS, flash sintering) approaches.

Life-Limiting Behavior of an Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature Subject to Foreign Object Damage

2018 ◽  
Author(s):  
Michael J. Presby ◽  
Nesredin Kedir ◽  
Luis J. Sanchez ◽  
D. Calvin Faucett ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Matrix Composite ◽  
Slow Crack Growth ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Constant Stress ◽  
Oxide Ceramic ◽  
Limiting Behavior ◽  
Alumina Oxide

The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200°C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent post-impact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure, or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using x-ray computed tomography (CT), and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.

Ceramic Gas Turbine Development: Need for a 10Year Plan

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Mark van Roode
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Large Scale ◽  
Ceramic Matrix Composite ◽  
Combined Cycle ◽  
High Fracture Toughness ◽  
Oxide Ceramic ◽  
Development Programs ◽  
High Fracture ◽  
Electrical Efficiency

Ceramic gas turbine development that started in the 1950s has slowed considerably since most of the large-scale ceramic gas turbine development programs of the 1970s–1990s ended. While component durability still does not meet expectations, the prospect of significant energy savings and emission reductions, potentially achievable with ceramic gas turbines, continues to justify development efforts. Four gas turbine applications have been identified that could be commercially attractive: a small recuperated gas turbine (microturbine) with ∼35% electrical efficiency, a recuperated gas turbine for transportation applications with ∼40% electrical efficiency with potential applications for efficient small engine cogeneration, a ∼40% efficient midsize industrial gas turbine, and a ∼63% (combined cycle) efficient utility turbine. Key technologies have been identified to ensure performance and component durability targets can be met over the expected life cycle for these applications. These technologies include a Si3N4 or SiC with high fracture toughness, durable EBCs for Si3N4 and SiC, an effective EBC∕TBC for SiC∕SiC, a durable oxide∕oxide ceramic matrix composite (CMC) with thermally insulating coating, and the next generation CMCs with high strength that can be used as structural materials for turbine components for small engines and for rotating components in engines of various sizes. The programs will require integrated partnerships between government, national laboratories, universities, and industry. The overall cost of the proposed development programs is estimated at U.S. $100M over 10years, i.e., an annual average of U.S. $10M.

Sintering in a graphite powder bed of alumina-toughened zirconia/carbon nanotube composites: a novel way to delay hydrothermal degradation

2015 ◽  
Vol 41 (3) ◽  
pp. 4569-4580 ◽  
Author(s):  
Mehdi Estili ◽  
J. Echeberria ◽  
J. Vleugels ◽  
K. Vanmeensel ◽  
Oleksandr B. Bondarchuk ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Graphite Powder ◽  
Powder Bed ◽  
Hydrothermal Degradation ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

Life-Limiting Behavior of an Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature Subject to Foreign Object Damage

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Michael J. Presby ◽  
Nesredin Kedir ◽  
Luis J. Sanchez ◽  
D. Calvin Faucett ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Matrix Composite ◽  
Slow Crack Growth ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Constant Stress ◽  
Oxide Ceramic ◽  
Limiting Behavior ◽  
Alumina Oxide

The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200 °C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent postimpact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using X-ray computed tomography (CT) and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.

scholarly journals Mechanical characterisation of a fibre reinforced oxide/oxide ceramic matrix composite

2015 ◽  
Vol 35 (16) ◽  
pp. 4513-4520 ◽  
Author(s):  
D.T. Di Salvo ◽  
E.E. Sackett ◽  
R.E. Johnston ◽  
D. Thompson ◽  
P. Andrews ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Oxide Ceramic ◽  
Mechanical Characterisation

scholarly journals Formation Process of Microstructure in Laser Powder Bed Fusion with WC Cemented Carbide Powder

2020 ◽  
Vol 67 (6) ◽  
pp. 313-319
Author(s):  
Hiroyuki IBE ◽  
Yuta KATO ◽  
Jyunya YAMADA ◽  
Masaki KATO ◽  
Asuka SUZUKI ◽  
...  
Keyword(s):  
Formation Process ◽  
Cemented Carbide ◽  
Carbide Powder ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed
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