Evaluation of ultra-high temperature ceramics foraeropropulsion use

Levine, Stanley R.; Opila, Elizabeth J.; Halbig, Michael C.; Kiser, James D.; Singh, Mrityunjay; Salem, Jonathan A.

doi:10.1016/s0955-2219(02)00140-1

Cited by 725 publications

(411 citation statements)

References 6 publications

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“…According to Aronsson 18 , in cases where ZrB has been observed, considerable O, C or N might have been present to stabilize the cubic structure, which is generally assumed to be the ZrB phase. The ZrB 2 phase is shown to have a very limited range of homogeneity and, as predicted by the phase diagram in Figure 2a, offstoichiometry compounds will contain either free boron or zirconium below 1500° C and may contain ZrB and ZrB 12 in the range of 1500° to 2200° C. 3 , and 97.9% of theoretical) at 2024 -1982 K with oxygen partial pressure of 18.5 torr and a carrier gas flow rate of 119 cm 3 /min gave parabolic rate constants. These studies of oxidation of HfB 2 predicted superior oxidation resistance of the metal-rich diboride 2 .…”

Section: Introductionmentioning

confidence: 87%

“…They are candidates for thermal protection materials in both reentry and hypersonic vehicles because of their high melting points and good oxidation resistance 1,2,3,4 . Their high melting points and oxidation resistance may allow more advanced vehicle designs with features like sharp leading edges and sharp nosecones.…”

Section: Introductionmentioning

confidence: 99%

“…For attritor milling, the powders were milled using silicon carbide media and hexane for approximately 1 hour at 600 rpm. Batch size was 250 cm 3 . In the attritor milled samples, weight loss from the SiC media was added to the silicon carbide content of the powder to arrive approximately at 2, 5, 10, and 20 vol% SiC in the diboride.…”

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confidence: 99%

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Ultra high temperature ceramics for hypersonic vehicle applications.

Tandon¹,

Dumm²,

Corral³

et al. 2006

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HfB 2 and ZrB 2 are of interest for thermal protection materials because of favorable thermal stability, mechanical properties, and oxidation resistance. We have made dense diboride ceramics with 2 to 20 % SiC by hot pressing at 2000°C and 5000 psi. High-resolution transmission electron microscopy (TEM) shows very thin grain boundary phases that suggest liquid phase sintering. Fracture toughness measurements give RT values of 4 to 6 MPam 1/2 . Four-pt flexure strengths measured in air up to 1450°C were as high as 450 -500 MPa. Thermal diffusivities were measured to 2000°C for ZrB 2 and HfB 2 ceramics with SiC contents from 2 to 20%. Thermal conductivities were calculated from thermal diffusivities and measured heat capacities. Thermal diffusivities were modeled using different two-phase composite models. These materials exhibit excellent high temperature properties and are attractive for further development for thermal protection systems. 4 ACKNOWLEDGMENTS

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Ultra high temperature ceramics for hypersonic vehicle applications.

Tandon¹,

Dumm²,

Corral³

et al. 2006

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“…Ceramics such as sintered alumina are thermally and chemically resistant and can withstand temperatures as high as 42000°C (Ref. 42) and aggressive applications in, for example, oven linings and plasma-etching equipment 43 . Some ceramics are also piezoelectrics and can therefore be applied in both sensors and microactuators.…”

Section: Precision In Harsh Environments P French Et Almentioning

confidence: 99%

Precision in harsh environments

2016

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Microsystems are increasingly being applied in harsh and/or inaccessible environments, but many markets expect the same level of functionality for long periods of time. Harsh environments cover areas that can be subjected to high temperature, (bio)-chemical and mechanical disturbances, electromagnetic noise, radiation, or high vacuum. In the field of actuators, the devices must maintain stringent accuracy specifications for displacement, force, and response times, among others. These new requirements present additional challenges in the compensation for or elimination of cross-sensitivities. Many state-of-the-art precision devices lose their precision and reliability when exposed to harsh environments. It is also important that advanced sensor and actuator systems maintain maximum autonomy such that the devices can operate independently with low maintenance. The next-generation microsystems will be deployed in remote and/or inaccessible and harsh environments that present many challenges to sensor design, materials, device functionality, and packaging. All of these aspects of integrated sensors and actuator microsystems require a multidisciplinary approach to overcome these challenges. The main areas of importance are in the fields of materials science, micro/nano-fabrication technology, device design, circuitry and systems, (first-level) packaging, and measurement strategy. This study examines the challenges presented by harsh environments and investigates the required approaches. Examples of successful devices are also given.

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“…In recent years, ZrB 2 -SiC ceramic have become one of the most attractive candidate materials for the thermal protection system of the next generation hypersonic vehicles due to its high melting points, high strength, high thermal conductivity and relatively low density [1,2,3,4]. During supersonic flight and re-entry process, ZrB 2 -SiC ceramic will serve in extremely harsh oxidative environment at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of a SPS Sintered ZrB₂-SiC-MoSi₂Ceramic at 1500 °C

Cao

2016

MATEC Web Conf.

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Abstract. ZrB 2 -SiC-MoSi 2 ceramic (ZSM) was successfully prepared by SPS sintering process. The micro-structure and mechanical property were characterized, the oxidation behavior of ZSM was mainly studied at 1500 0 C in air. Compared to ZrB 2 -SiC ceramic (ZS), the mechanical property of ZSM was improved significantly. MoB phase increasing the mechanical and chemical bonding force between different phases was formed in ZSM during SPS sintering. After 10 h oxidation at 1500 0 C in air, oxide layer thickness of ZSM was thinner than ZS, oxidation resistance of ZSM was better than ZS.

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Evaluation of ultra-high temperature ceramics foraeropropulsion use

Cited by 725 publications

References 6 publications

Ultra high temperature ceramics for hypersonic vehicle applications.

Ultra high temperature ceramics for hypersonic vehicle applications.

Precision in harsh environments

Oxidation Behavior of a SPS Sintered ZrB₂-SiC-MoSi₂Ceramic at 1500 °C

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Evaluation of ultra-high temperature ceramics foraeropropulsion use

Cited by 725 publications

References 6 publications

Ultra high temperature ceramics for hypersonic vehicle applications.

Ultra high temperature ceramics for hypersonic vehicle applications.

Precision in harsh environments

Oxidation Behavior of a SPS Sintered ZrB2-SiC-MoSi2Ceramic at 1500 °C

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Product

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Oxidation Behavior of a SPS Sintered ZrB₂-SiC-MoSi₂Ceramic at 1500 °C