Optical And Mechanical Properties Of Highly Transparent Spinel And ALON Domes

Hartnett, T.; Gentilman, Richard L.

doi:10.1117/12.964620

Cited by 34 publications

(22 citation statements)

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“…A fracture toughness value of 1.73 MPa"~m at ambient temperature was reported for MgA120A at ambient temperature [Hartnett and Gentilman, 1984]. This value…”

Section: 13 Fracture Toughnessmentioning

confidence: 61%

“…Hartnett and Gentilman [1984] reported a Young's modulus of 277 GPa, a shear modulus of 110 GPa, and a Poisson's ratio of 0.26 on transparent, optical quality material with a bimodal grain size distribution of 65 and 4 pm. The material was fabricated by powder processing methods.…”

Section: Elastic Propertiesmentioning

confidence: 99%

“…The relative, high-temperature thermal expansion of MgA120q is comparable to that of A1203 and about twice that of AIN, as shown above in Figure 3.4.5. Hartnett and Gentilman [1984] give an average value of There are three well-defined structural phases exhibited by Zr02: the xnonoclinic phase is stable below about 1170"C, the tetragonal phase is stable between-about 1170 and 2370"C, and the cubic phase is stable from 2370"C to the melting point of 2680"C. Crystallographic and physical properties of these phases are tabulated in a review by Stevens [1991]. Because a large volume change of 3 to 5% occurs upon cooling from the tetragonal to monoclinic phase, elastic and fracture limits are exceeded even in relatively small grains of Zr02, and cracking occurs.…”

Section: Thermal Expansionmentioning

confidence: 99%

“…The powder-processed specimens had a bimodal grain structure with two average grain sizes of 65 and 4 pm. A toughness value of 1.3 MPa*~m was reported for single-crystal MgA120q [citation, Hartnett and Gentilman, 1984].…”

Section: 13 Fracture Toughnessmentioning

confidence: 99%

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

Simon¹

1994

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“…A fracture toughness value of 1.73 MPa"~m at ambient temperature was reported for MgA120A at ambient temperature [Hartnett and Gentilman, 1984]. This value…”

Section: 13 Fracture Toughnessmentioning

confidence: 61%

Section: Elastic Propertiesmentioning

confidence: 99%

Section: Thermal Expansionmentioning

confidence: 99%

Section: 13 Fracture Toughnessmentioning

confidence: 99%

See 2 more Smart Citations

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

Simon¹

1994

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“…A fracture toughness value of 1.73 MPa^Vm at ambient temperature was reported for MgAl204 at ambient temperature [Hartnett and Gentilman, 1984] . This value…”

Section: Fracture Toughnessmentioning

confidence: 96%

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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Nitride Ceramics

Hampshire

2006

Materials Science and Technology

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Optical And Mechanical Properties Of Highly Transparent Spinel And ALON Domes

Cited by 34 publications

References 0 publications

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

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

Cryogenic properties of inorganic insulation materials for ITER magnets:

Nitride Ceramics

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