Coupled growth of unidirectionally solidified Al2O3–YAG eutectic ceramics

Mizutani, Yukio; Yasuda, Hideyuki; Ohnaka, Itsuo; Maeda, Nobuhiro; Waku, Yoshiharu

doi:10.1016/s0022-0248(02)01655-x

Cited by 68 publications

(44 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The precision casting and the joining successfully demonstrate that the undercooled melt shaping using the Al 2 O 3 -YAP metastable eutectic particles produces [19], m-PD method (closed triangle) [20] and solidification from the undercooled melt (closed square) [21] are also plotted.…”

Section: Feasibility Of Precision Casting and Joiningmentioning

confidence: 92%

“…12 shows a morphological map of the Al 2 O 3 -YAG eutectic system as a function of the growth velocity and the composition. The Al 2 O 3 -YAG equilibrium eutectic system has a narrow coupled growth zone for unidirectional solidification [19] and solidification from the undercooled melt [21]. The composition range of the coupled growth for the solidification in the undercooled melt was approximately 2 -4 mol%, even at the lowest growth velocity of 1.4 £ 10 27 m/s, and became narrower at higher growth velocities.…”

Section: Heat Transfer Between the Al 2 O 3 -Yag Interface And The Almentioning

confidence: 97%

“…6 shows the lamellar spacing of the Al 2 O 3 -YAG equilibrium eutectic structure obtained by the solidification accompanied by the melting. The experimental results obtained by the unidirectional solidification [19,20] and by the solidification from the undercooled melt [21] are also presented. The experimental results roughly obey the Jackson -Hunt relationship [22].…”

Section: Effect Of the Al 2 O 3 -Yap Eutectic Structure On The Undercmentioning

confidence: 99%

See 2 more Smart Citations

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics

Yasuda

Ohnaka

Mizutani

et al. 2004

Science and Technology of Advanced Materials

Self Cite

View full text Add to dashboard Cite

There are two eutectic systems in the Al 2 O 3 -rich portion of the Al 2 O 3 -Y 2 O 3 system: one is the Al 2 O 3 -YAG equilibrium eutectic system and the other is the Al 2 O 3 -YAP metastable eutectic system. Heating the Al 2 O 3 -YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 mm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al 2 O 3 -YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition. q

show abstract

Section: Feasibility Of Precision Casting and Joiningmentioning

confidence: 92%

Section: Heat Transfer Between the Al 2 O 3 -Yag Interface And The Almentioning

confidence: 97%

Section: Effect Of the Al 2 O 3 -Yap Eutectic Structure On The Undercmentioning

confidence: 99%

See 1 more Smart Citation

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics

Yasuda

Ohnaka

Mizutani

et al. 2004

Science and Technology of Advanced Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…[7][8][9][10] When the melt that has a metastable eutectic composition is heated to temperatures above 2273 K, the Al 2 O 3 -YAP metastable system is indispensably selected. In our previous work, [8][9][10][11][12][13][14][15] heating the Al 2 O 3 -YAP metastable eutectic system up to temperatures above the metastable eutectic temperature, undercooled melt for Al 2 O 3 -YAG equilibrium eutectic system was produced due to melting of the Al 2 O 3 -YAP metastable eutectic structure at the metastable eutectic temperature.…”

Section: )mentioning

confidence: 99%

“…On the basis of these findings, a novel solidification technique utilizing the undercooled melt shaping has been developed. [8][9][10][11][12][13][14][15] Our previous paper demonstrated that Al 2 O 3 -YAG castings with a relatively complex shape were produced by the undercooled melt shaping. 13) For example, the groove shape of the molybdenum mold (300 mm in width and 1 mm in thickness) was well transferred to the castings.…”

Section: )mentioning

confidence: 99%

Effects of Shaping Conditions on the Microstructure and the Mechanical Property of the Al2O3-YAG Eutectic Composite Produced by Melting the Al2O3-YAP Eutectic Structure

Nagira¹,

Yasuda²,

Sakimura³

et al. 2007

Mater. Trans.

Self Cite

View full text Add to dashboard Cite

When the Al 2 O 3 -YAP metastable eutectic system was heated above the metastable eutectic temperature but below the equilibrium eutectic temperature, undercooled melt was formed. Solidification in the equilibrium path accompanied the melting of the metastable eutectic system, resulting in a fine and uniform eutectic structure. A novel solidification process using undercooled melt formation was developed. In this paper, the influences of the initial Al 2 O 3 -YAP eutectic particle size, forming pressure and holding time at the maximum temperature on the microstructure and/or the mechanical property of the Al 2 O 3 -YAG compact were examined to optimize the forming conditions. The Al 2 O 3 -YAG compact produced from the Al 2 O 3 -YAP eutectic particles with diameters less than 20 mm exhibited a higher flexural strength and the smaller porosity as compared to that produced from Al 2 O 3 -YAP eutectic particles with diameters ranging from 20 mm to 45 mm. The volume fraction of the porosity was approximately 4% under a forming pressure of 10 MPa and a holding time of 60 s. The flexural strength of the Al 2 O 3 -YAG compact decreased with the increase in the holding time due to the increase in the lamellar spacing. For Al 2 O 3 -YAP eutectic particles with diameters less than 20 mm, a low forming pressure of 10 MPa and a short holding time of 60 s were sufficient to synthesize a dense Al 2 O 3 -YAG compact. Thus, the solidification technique that uses undercooled melt produced by melting the Al 2 O 3 -YAP metastable eutectic system has good advantages for shaping.

show abstract

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Liu

Ohodnicki

2021

Adv Materials Technologies

View full text Add to dashboard Cite

The state of the art of single crystal fiber (SCF) fabrication has evolved and improved over the last five decades. Nowadays, edge‐defined film‐feed growth, micro‐pulling down, and laser heated pedestal growth are three major techniques for the fabrication of SCF. Solid state crystal growth and temperature gradient technology are also very active recently making small size SCF. These optical fiber growth techniques are powerful material research tools employed globally for both scientific inquiry and practical applications. This article introduces the development of SCF growth techniques, with particular emphasis on recent practical applications including temperature sensing, radiation environment sensing, fiber laser and power delivery, chemical and medical application, imaging application, and piezoelectric application. In all cases, the application‐oriented point of view provides the reader with an up‐to‐date panorama of the vast possibilities offered by SCF. In the end, perspectives on the trends and future development of single crystal fibers are discussed.

show abstract

Coupled growth of unidirectionally solidified Al2O3–YAG eutectic ceramics

Cited by 68 publications

References 29 publications

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics

Effects of Shaping Conditions on the Microstructure and the Mechanical Property of the Al<SUB>2</SUB>O<SUB>3</SUB>-YAG Eutectic Composite Produced by Melting the Al<SUB>2</SUB>O<SUB>3</SUB>-YAP Eutectic Structure

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Contact Info

Product

Resources

About

Coupled growth of unidirectionally solidified Al2O3–YAG eutectic ceramics

Cited by 68 publications

References 29 publications

Solidification and shape casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics

Solidification and shape casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics

Effects of Shaping Conditions on the Microstructure and the Mechanical Property of the Al<SUB>2</SUB>O<SUB>3</SUB>-YAG Eutectic Composite Produced by Melting the Al<SUB>2</SUB>O<SUB>3</SUB>-YAP Eutectic Structure

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Contact Info

Product

Resources

About

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics

Solidification and shape casting of Al₂O₃–YAG eutectic ceramics from the undercooled melt produced by melting Al₂O₃–YAP eutectics