Creep of Oxide Single Crystals

Corman, Gregory S.

doi:10.21236/ada238756

Cited by 11 publications

(6 citation statements)

References 28 publications

(50 reference statements)

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“…Y ag (yttrium aluminum garnet, Y 3 Al 5 O 12 ) is considered to be the most creep‐resistant ceramic material 1,2 . [110] and [111] YAG crystals have a higher creep resistance compared with c ‐axis sapphire (Al 2 O 3 ), which is considered to be comparable.…”

Section: Introductionmentioning

confidence: 99%

“…Y AG (yttrium aluminum garnet, Y 3 Al 5 O 12 ) is considered to be the most creep-resistant ceramic material. 1,2 [110] and [111] YAG crystals have a higher creep resistance compared with c-axis sapphire (Al 2 O 3 ), which is considered to be comparable. The creep properties of sapphire are highly anisotropic, but those of YAG are relatively isotropic, as it has a cubic crystal structure.…”

Section: Introductionmentioning

confidence: 99%

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Processing and Characterization of Multiphase Ceramic Composites Part I: Duplex Composites FormedIn Situfrom Solution

Kim

Kriven

2007

Journal of the American Ceramic Society

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Chemically compatible 50 vol% Al2O3–50 vol% YAG (yttrium aluminum garnet, Y3Al5O12), 50 vol% Al2O3–50 vol% mullite, and 50 vol% Al2O3–50 vol% NiAl2O4, in situ, duplex composite powders were fabricated by a chemical synthesis method. Both amorphous and crystalline powders were synthesized. The physical and mechanical properties of YAG and in situ, solution derived composites made using these powders were analyzed. Mechanically mixed, composite powders were made by a conventional, ball‐milling technique. The properties of the composites made from in situ versus mechanically mixed powders were studied. Compared with pellets made from crystalline powder, amorphous powder‐derived pellets had about a twofold higher sintering shrinkage. The crystalline powder‐derived YAG pellet sintered at 1650°C for 10 h had a three‐point bending strength of 244±3 MPa. A 50 vol% Al2O3–50 vol% YAG in situ composite achieved an average bending strength of 361±19 MPa after sintering at 1700°C for 5 h. Grain size measurements indicated a mutual grain growth retardation effect of alumina and YAG phases in the composites. The better properties of in situ composites compared with mechanically mixed composites were attributed to the intimate mixing, at a molecular level, during the processing of in situ composites. The possible formation of a glassy phase in the Al2O3‐mullite in situ composite heat treated at higher temperatures was discussed. The physical and mechanical properties of alumina–mullite and Al2O3–NiAl2O4in situ composites were investigated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Multiphase Ceramic Composites Part I: Duplex Composites FormedIn Situfrom Solution

Kim

Kriven

2007

Journal of the American Ceramic Society

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“…[14][15][16][17][18][19][20][21][22][23][24][25][26] Most single crystal work * Corresponding author. Tel.…”

Section: Introductionmentioning

confidence: 99%

“…This structure results in a large variability in creep resistance with orientation. [14][15][16] The actual use temperature of a composite containing sapphire fiber may be as low as 1200 • C where basal slip limits the creep behavior. A better candidate for a creep resistant single phase-single crystal fiber is yttriumaluminum-garnet.…”

Section: Introductionmentioning

confidence: 99%

Creep of directionally solidified alumina/YAG eutectic monofilaments

Matson

Hecht

2005

Journal of the European Ceramic Society

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“…R ECENT creep measurements on oxide single crystals 1,2 have established that yttrium aluminum garnet (YAG), Y 3 Al 5 O 12 , is the most creep-resistant oxide known; thus singlecrystal YAG has become a potential component in oxidationresistant ceramic-matrix composites. Its superior creep resistance in the polycrystalline form 3 has created interest in polycrystalline YAG as a potential matrix as well as a potential fiber reinforcement for oxide matrices.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature, Environment, and Orientation on the Fracture Toughness of Single‐Crystal YAG

Mah

Parthasarathy

1997

Journal of the American Ceramic Society

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The fracture toughness of single-crystal YAG was measured as a function of temperature in air and under vacuum using the SENB technique up to 1600°C. The measured K IC was 2.2 MPa⅐m 1/2 at room temperature and it increased with temperature above 1200°C, reaching a value of 4.5 MPa⅐m 1/2 at 1600°C in air. The effects of crystallographic orientation and oxygen partial pressure on toughness were studied at 1600°C. The toughness increased further to 5.5 MPa⅐m 1/2 when tested under vacuum (10 −5 torr) at 1600°C. Both temperature and testing environments were found to influence the fracture toughness, but there was no significant effect of crystallographic orientation.

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Creep of Oxide Single Crystals

Cited by 11 publications

References 28 publications

Processing and Characterization of Multiphase Ceramic Composites Part I: Duplex Composites FormedIn Situfrom Solution

Processing and Characterization of Multiphase Ceramic Composites Part I: Duplex Composites FormedIn Situfrom Solution

Creep of directionally solidified alumina/YAG eutectic monofilaments

Effects of Temperature, Environment, and Orientation on the Fracture Toughness of Single‐Crystal YAG

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