Investigations on ceramic materials for fusion technology

Dienst, W.; Fett, T.; Heidinger, R.; Röhrig, Horst; Schulz, B.

doi:10.1016/0022-3115(90)90427-o

Cited by 33 publications

(19 citation statements)

References 10 publications

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“…[12,13,[24][25][26][27][28][29][30][31][32][33][34][35] When considering the irradiation effects on the strength of SiC it is important to differentiate between the stoichiometric and nonstoichiometric ceramics. Forms of SiC include reaction bonded, sintered, pressureless sintered, SiC converted from reaction of graphite with molten Si or silicon monoxide, SiC derived from polymer precursors, and materials formed from the decomposition of gasses such as methyl or ethyltrichlorosilane (MTS or ETS.)…”

Section: Monolithic Sicmentioning

confidence: 99%

“…For all cases, the values are for Weibull's mean with error bars indicating ±1 Weibull's standard deviation. However, while the work of Dienst [28,33] references the use of ten samples per condition and gives Weibull's mean and modulus, no standard deviation was given. The dotted lines of the figure are approximations of this standard deviation as calculated using Weibull data provided by Dienst [28,33].…”

Section: Monolithic Sicmentioning

confidence: 99%

“…However, while the work of Dienst [28,33] references the use of ten samples per condition and gives Weibull's mean and modulus, no standard deviation was given. The dotted lines of the figure are approximations of this standard deviation as calculated using Weibull data provided by Dienst [28,33]. From the compilation data of Figure 10 it appears that a real increase in flexural strength occurs for CVD SiC for doses of less than 10 dpa.…”

Section: Monolithic Sicmentioning

confidence: 99%

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Evaluation of neutron irradiated silicon carbide and silicon carbide composites

Newsome

Snead

Hinoki

et al. 2007

Journal of Nuclear Materials

142

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The effects of fast neutron irradiation on SiC and SiC composites have been studied. The materials used were chemical vapor deposition (CVD) SiC and SiC/SiC composites reinforced with either Hi-Nicalon™ Type-S, Hi-Nicalon™ or Sylramic™ fibers fabricated by chemical vapor infiltration. Statistically significant numbers of flexural samples were irradiated up to 4.6 x 10 25 n/m 2 (E>0.1 MeV) at 300, 500 and 800°C in the High Flux Isotope Reactor at Oak Ridge National Laboratory. Dimensions and weights of the flexural bars were measured before and after the neutron irradiation. Mechanical properties were evaluated by four point flexural testing.Volume increase was seen for all bend bars following neutron irradiation. Magnitude of swelling depended on irradiation temperature and material, while it was nearly independent of irradiation fluence over the fluence range studied. Flexural strength of CVD SiC increased following irradiation depending on irradiation temperature. Over the temperature range studied, no significant degradation in mechanical properties was seen for composites fabricated with Hi-Nicalon™ Type-S, while composites reinforced with Hi-Nicalon™ or Sylramic fibers showed significant degradation. The effects of irradiation on the Weibull failure statistics are also presented suggesting a reduction in the Weibull modulus upon irradiation. The cause of this potential reduction is not known.

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Section: Monolithic Sicmentioning

confidence: 99%

Section: Monolithic Sicmentioning

confidence: 99%

Section: Monolithic Sicmentioning

confidence: 99%

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Evaluation of neutron irradiated silicon carbide and silicon carbide composites

Newsome

Snead

Hinoki

et al. 2007

Journal of Nuclear Materials

142

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“…Since comparative cryogenic data from the same investigator are not available, the comparative thermal conductivity of AIN, A1203, and MgA120q above ambient temperature is presented in Figure 3.3.3 for two forms of AIN: hot isostatically pressed (HIP) and commercial, sintered materials [Dienst et al, 1990] .…”

Section: Specific Heatmentioning

confidence: 99%

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Simon¹

1994

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“…A handbook value for the specific heat at 298 K is 800 J/(kg-K) [Moore, 1991]. conductivity data on less pure crystals and data on ceramic specimens [Slack, 1973] .Since comparative cryogenic data from the same investigator are not available, the comparative thermal conductivity of AIN, AI 2 O 3 , and MgAl 204 , above ambient temperature is presented in Figure 3.3.3 for two forms of AIN: hot isostatically pressed (HIP) and commercial, sintered materials [Dienst et al, 1990].The lower conductivity of the HIP grade may be due to a 5% AI 2 O 3 content, but even so, the conductivity is substantially above the conductivities of AI 2 O 3 and MgAl 204 . Aluminum nitride is known as a high thermal conductivity ceramic.…”

mentioning

confidence: 99%

Cryogenic properties of inorganic insulation materials for ITER magnets:

1994

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Results of a literature search on the cryogenic properties of candidate inorganic insulators for the ITER'*' TF* magnets are reported. The materials investigated include: AI 2 O 3 , AlN, MgO, porcelain, Si 02 , MgAl 20^, Zr 02 , and mica. A graphical presentation is given of mechanical, elastic, electrical, and thermal properties between 4 and 300 K. A companion report* reviews the low temperature irradiation resistance of these materials.Key words: cryogenic properties, electrical properties, inorganic insulation, ITER magnets, mechanical properties, thermal properties FOREWORD For insulator downselection and design, data are required on the 4-K compressive and shear strengths and the electrical breakdown strength. However, for most of these inorganic insulators, very few measurements of these and other 4-K properties were retrieved in the literature search, with the notable exception of thermal properties, which have been adequately measured for most of the candidate insulators. Using existing bibliographic data bases to locate cryogenic data is difficult, owing to the inadequate indexing of the data bases and the circumstance that much basic cryogenic information predates 'Materials Reliability Division, Materials Science and Engineering Laboratory. Technology, Boulder, CO. 430 pp iii the effective date of the databases. Therefore, additional "manual" searching was done, often with excellent yields, to supplement the on-line retrieval systems.However, these procedures are extremely time-consuming. Concept sketch of the TF magnet shear plates and conductor-incable configuration:"solid" rib option.From Reed [1993] 3 Figure 1.0.2. Concept sketch of the TF magnet shear plates and conductor-incable configuration:"bonded" rib option.From Reed [1993] 4Figure 1.1.1. Dependence of the compressive strength upon grain size for AI2O3. Data from Rice [1971] Dependence of the compressive strength upon the percent porosity for quartz ceramic. Data from Borodai and Suzdal 'tsev [1975] Dependence of the compressive strength upon the percent porosity.The curves depict two theoretical predictions. Data from Nielsen Effective fracture energy is proportional to the square of the fracture stress at constant initial crack length.Data from Fetch [1971] 12Figure 1.1.6. Effect of hydrostatic pressure on the compressive strength of AI2O3 , AIN, and MgO.Data from Heard and Cline [1980] 16 Chamber for dielectric breakdown measurements in an electron beam.From Goland [1978] 28 Figure 1.3.3. Dependence of electrical breakdown strength upon specimen thickness for several forms of AI2O3. Data from Morse and Hill [1970] 29 Comparison of thermal expansion coefficients of several alumina ceramics.Data from Burk [1962] ..,.51 Compressive strength of quartz at 77 and 513 K. Data from Charles [1959] ....90 Breaking strength of unabraded glass specimens at 76 and 296 K at 5.5 MPa/s stress increase. Data from Kropschot and Mikesell [1960] 92Figure 6.1.5.Breaking strength of abraded glass specimens at 296 K at 5.5MPa/s str...

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Investigations on ceramic materials for fusion technology

Cited by 33 publications

References 10 publications

Evaluation of neutron irradiated silicon carbide and silicon carbide composites

Evaluation of neutron irradiated silicon carbide and silicon carbide composites

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Cryogenic properties of inorganic insulation materials for ITER magnets:

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