Ceramic matrix composite

About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.

Corrosion of High-Performance Ceramics

Abstract: 1 Introduction- 2 Oxidation in Oxygen and Air- 21 Silicon Nitride Ceramics- 211 Thermodynamics of Si3N4 Oxidation- 212 Composition of Oxide Layer- 213 Effect of Phase and Chemical Composition of Ceramics- 214 Oxidation of Porous Ceramics- 215 Oxidation of Dense Ceramics- 216 Peculiarities of Oxidation Kinetics- 22 Silicon Carbide Ceramics- 221 Thermodynamics of SiC Oxidation- 222 Composition of Oxide Layer- 223 Hot-Pressed and Sintered SiC- 224 Self-Bonded and Recrystallized SiC- 23 Aluminium Nitride Ceramics- 24 Boron Carbide Ceramics- 25 Boron Nitride Ceramics- 26 Ceramic Matrix Composites- 261 Nonoxide Matrix Composites- 262 Oxide Matrix Composites- 3 Gaseous Corrosion of Ceramics- 31 Hot Corrosion- 311 Silicon Nitride Ceramics- 312 Silicon Carbide Ceramics- 313 Oxide Ceramics- 32 Water Vapour Corrosion- 321 Nonoxide Ceramics- 322 Zirconia Ceramics- 33 Corrosion in Carbon Oxide Environments- 34 Corrosion in Halogen- and Chalcogen-Containing Environments- 4 Corrosion in Liquid Media- 41 Corrosion in Solutions- 411 Silicon Nitride Ceramics- 412 Silicon Carbide Ceramics- 413 Aluminium Nitride Ceramics- 414 Boron Carbide Ceramics- 415 Boron Nitride Ceramics- 416 Oxide Ceramics- 42 Molten Salt and Alkali Corrosion- 5 Corrosion Effect on Ceramic Properties- 51 Preoxidation of Ceramics- 511 Silicon Nitride Ceramics- 512 Silicon Carbide Ceramics- 513 Aluminium Nitride Ceramics- 514 Zirconia Ceramics- 52 Effect of Corrosion in Different Environments- 521 Hot Corrosion- 522 Molten Salt Corrosion- 523 Corrosion in Solutions- 6 Mechanical Properties and Corrosion- 61 Effect of Oxidation on Results of High-Temperature Mechanical Tests- 611 Silicon Nitride Ceramics- 612 Silicon Carbide Ceramics- 613 Boron Carbide Ceramics- 62 Effect of Salts on High-Temperature Strength- 63 Failure of Ceramics Affected by Long-Term Mechanical Loading in Corrosive Environment- 631 Silicon Nitride Ceramics- 632 Silicon Carbide Ceramics- 633 Alumina Ceramics- 634 Zirconia Ceramics- 635 Salt-Assisted Strength Degradation- 636 Triboxidation- 64 Lifetime Prediction in View of Environmental Effects- 7 Corrosion Protection and Development of Corrosion-Resistant Ceramics- 71 Chemical-Vapour Deposited Coatings- 72 Sprayed and Sputtered Coatings- 73 Impregnation and Other Methods of Protection- 74 Choice of Optimum Ceramic Composition- References

Synthesis, consolidation and characterization of monolithic and SiC whiskers reinforced HfB2 ceramics

Abstract: Spark Plasma Sintering is used for the fabrication of highly dense HfB2 monolithic and HfB2–26 vol.% SiCw composite. Reactive SPS from elemental reactants is preferred for the preparation of bulk HfB2 instead of classical sintering. The desired phase is rapidly formed through a solid–solid combustion synthesis mechanism, while full densification is achieved in 30 min at 1350 A when the applied pressure is switched from 20 to 50 MPa after the synthesis reaction. A 99.4% dense whiskers-reinforced HfB2 ceramic matrix composite is also obtained in 30 min by SPS (I = 1350 A, P = 20 MPa) using SHSed HfB2 powders and SiCw. Nevertheless, whiskers degradation into SiCp resulted under such conditions (temperature up to 1830 °C). On the other hand, the presence of whiskers is clearly evidenced in 96% dense products obtained when the applied current was decreased down to 1200 A (1700 °C) while P was increased to 60 MPa.

Foreign Object Damage Phenomenon by Steel Ball Projectiles in a SiC/SiC Ceramic Matrix Composite at Ambient and Elevated Temperatures

Abstract: Foreign object damage (FOD) phenomenon of a gas-turbine grade SiC/SiC ceramic matrix composite (CMC) was determined at 25° and 1316°C using impact velocities ranging from 115 to 440 m/s by 1.59-mm diameter steel ball projectiles. Two types of target-specimen support were employed at each temperature: fully supported and partially supported. For a given temperature, the degree of impact damage increased with increasing impact velocity, and was greater in partial support than in full support. The elevated-temperature FOD resistance of the composite, particularly in partial support at higher impact velocities ≥350 m/s, was significantly less than the ambient-temperature counterpart, attributed to a weakening effect of the composite. In full support, frontal contact stresses played a major role in generating composite damage; whereas, in partial support both frontal contact and backside tensile stresses were combined sources of damage generation. Formation of cone cracks initiating from impact site was also one of the key damage features. The SiC/SiC composite was able to survive higher energy impacts without complete structural failure, as compared with gas-turbine grade AS800 and SN282 monolithic silicon nitrides.