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Ähnlich wie Effects of Sulfate Ion on the Densification of Yttria Ceramics
Ähnlich wie Effects of Sulfate Ion on the Densification of Yttria Ceramics (20)
Effects of Sulfate Ion on the Densification of Yttria Ceramics
- 1. Journal of the Ceramic Society of Japan 111mXn664–668i @C
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Paper
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¬ì› „Erã²NÞEî‡ËsÞ
E캳sÞEðä«ÍÞEçgCî
Þ Þ
@åwHw”¨¿»wÈC184–0002 Œžs¬àäsì¬ 3–7–2
¨¿ Þ¿¤†@C305–0044 ïé§ÂÎsÀØ 1–1
Þ E
ÞåËZ‰~bNX(”)C304–0005 ï駺Ès¼Jš´R 482–1
Þ
EŠects of the Sulfate Ion Exerted on Densiˆcation of Yttria on Precursor Synthetic
Takeshi ONODERA, Takayasu IKEGAMI,ÞYoshiyuki YAJIMA,ÞMasayuki KAWAMURA,ÞÞ
Masaaki SAKAIÞÞand Yusuke MORIYOSHI
Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3–7–2, Kajinocho, Koganeishi, Tokyo 184–0002
National Institute for Materials Science, 1–1, Namiki, Tsukubashi, Ibaraki 305–0044
Þ
ÞOhtsuka Ceramics Inc., 482–1, Hanya, Shimotsumashi, Ibaraki 304–0005
Þ
Ammonium hydroxide was used at 10‹ as the precipitant to synthesize thin ‰akes of yttrium hydroxide, ag
C
glomerating in a manner resembling houses of card. One mol÷ to 50 mol÷ of ammonium sulfate was added
to the yttrium hydroxide. Doping of sulfate ion resulted in yttria particles with round edges, in contrast to
undoped yttria particles with sharp edges. The amount of doped sulfer was reduced to S/Y10|3 by calcina
tions at 1100‹ and to trace by sintering at 1700‹ Doping of 10 mol÷ of ammonium sulfate resulted in the
C, C.
maximum transparency in those of the yttria ceramics. Transparency of the yttria ceramics related to brittle
ness of agglomerate of the calcined powder which was evaluated by collapsing tendency of the agglomerates
by ultrasonic dispersion. [Received December 24, 2002; Accepted July 24, 2003]
Keywords : Yttria, Sulfate ion, Yttrium hydroxide, Lowtemperature synthesis, Houses of card, Densiˆcation, Trans
parency
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. ¾ ÖŒ»w»C99.99÷jðC¾aÜÉÍA“‚jA…iaõƒ
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Fig. 1. Typical SEM micrograph showing the morphology of the
precursor.
Table 1. Chemical Analysis on the Undoped, the 5 mol÷ and the
10 mol÷ SO42|Doped Precursors
Fig. 2. Five weight loss curves of the precursors, yttrium sulfate
and yttrium nitrate.
- 3. 666 CbgŠAÌk§»ÉyÚ·Oì̇¬žÉ¨¯é°_CI“YÁÌe¿
Fig. 3. XRD patterns of the precursors depending on amount of
sulfate ion: (a) undoped, (b) 5 mol÷ SO42|, (c) 10 mol÷ SO42|,
(d) 50 mol÷ SO42|.
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©Á½±ÆðÓ¡µÄ¨èC꟱q¯mªlbNÉæ苇 Fig. 4. Three SEM micrographs showing morphology of the yt
µÄ¢é±Æð¦·D±êÉεÄCSEM ±qaÆäÊÏ tria powders calcined at 1100‹ (a) undoped, (b) 1 mol÷ SO42|,
C:
(c) 10 mol÷ SO42|.
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- 4. ¬ì› „ ¼ Journal of the Ceramic Society of Japan 111mXn @C
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Fig. 7. Relations between (100–Q(0.6 mm)) (÷) and ultrasonic
Fig. 5. Particle size of yttria dependent on amount of sulfate ion.
irradiation time.
Fig. 8. SEM micrographs showing morphology of the yttria pow
ders calcined at 1100‹ (a) 50 mol÷ SO42|, (b) yttrium sulfate.
C:
Fig. 6. Particle size distributions changed by ultrasonic irradia
tion of 10 mol÷ SO42|.
£iµÈ¢öxÌ10 mol÷ªÅKÅ éD
}XÉ™¬¸·ºÉ¨¯éüûkÈüƬ`§x𦵽D
¬`Ì̧xÍCÃW̳ªÅàã¢10 mol÷YÁ̲–
ª CÅ à å« ©Á ½ D } 7 Æ } 9 ð ä r · é Æ ª © é æ ¤
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.
Fig. 9. Shrinkage curves of yttria powders under CRH sintering
}@A É»ê¼ê̲–ðp¢ÄC 1700‹ 2 h ^óÄ‹µC
CÅ
at a heating rate of 10‹
C/min.
ú³ 1 mm ɾʤµ½CbgŠAÄ‹ÌÌÊ^ð¦·DÃ
WªÅàãCÄ‹«ÉDê½°_CI“10 mol÷YÁ̲–
ðp¢½Ä‹ÌÍC_§xi5.031 Mg/m3 )2) Ì99.9÷ÜÅ
k§»µÄ¨èCÄ‹ÌðʵÄä†Ì¶šªÍÁ«èÆÇÝ Ì°©ÌcÊÍC°_CI“ð50 mol÷YÁµ½CbgŠAÅ
æêéÙÇ̧¾x𦵽D à 7 mass ppb ȺÅC¼ÄâÄ‹ÅYÁµ½°_CI“ÍÙ
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A ɦ·Æ¨èÅ èCÄ‹ã ÆñÇÈÈéD
- 5. 668 CbgŠAÌk§»ÉyÚ·Oì̇¬žÉ¨¯é°_CI“YÁÌe¿
Fig. 10. Typical examples of yttria ceramics sintered at 1700‹
C
for 2 h in vacuum: (a) undoped, (b) 1 mol÷ SO42|, (c) 5 mol÷
SO42|, (d) 10 mol÷ SO42|, (e) 20 mol÷ SO42|, (f) 50 mol÷
SO42|.
Fig. 12. Optical inline transmission spectra of 1 mmthick of yt
tria ceramics.
½D°_CI“ÌYÁÊÍ 10 mol÷ªÅKÅ èC±Ìð
Ҭµ ½C bg ŠA²– ÍC ½Ï ±a ªñ 60 nm Æ ÷×
ÅC꟱qÌÃWͪñíÉãCÄ‹«ÉDê½²–Å
éD±Ì²–ðp¢éÆC1700‹ 2 h Ì^óÄ‹Å‹õÌ
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æɨ¢Ä¼ü§ß¦60÷ÆC‚¢§¾xð¦·Ä‹Ìª»
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ÈÃWÆÈÁ½DYÁµ½°_CI“ÍC¼ÄâÄ‹†ÉÙÆ 15) Ikegami, T., Li, J.G., Mori, T. and Moriyoshi, Y., J. Am.
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ñÇÁ¸µCċ̆ÉcÁ½°©Í 7 mass ppb ȺŠÁ 16) Holcombe, C. E., Jr., J. Am. Ceram. Soc., Vol. 61, pp.
½D 481–486 (1978).
17) WulŠ, G., Z. Krystallger., Vol. 34, pp. 449–530 (1901).
(3) ÃWªÆãÅ éÙÇÄ‹«ªÇC§¾xàÇ©Á
![Journal of the Ceramic Society of Japan 111mXn664–668i @C
B@ j
Paper
Ÿ¿Äæ›mk§»jy{XOì̇¬žjIP‘°_Ÿ¥ïYÁme¿
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E캳sÞEðä«ÍÞEçgCî
Þ Þ
@åwHw”¨¿»wÈC184–0002 Œžs¬àäsì¬ 3–7–2
¨¿ Þ¿¤†@C305–0044 ïé§ÂÎsÀØ 1–1
Þ E
ÞåËZ‰~bNX(”)C304–0005 ï駺Ès¼Jš´R 482–1
Þ
EŠects of the Sulfate Ion Exerted on Densiˆcation of Yttria on Precursor Synthetic
Takeshi ONODERA, Takayasu IKEGAMI,ÞYoshiyuki YAJIMA,ÞMasayuki KAWAMURA,ÞÞ
Masaaki SAKAIÞÞand Yusuke MORIYOSHI
Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3–7–2, Kajinocho, Koganeishi, Tokyo 184–0002
National Institute for Materials Science, 1–1, Namiki, Tsukubashi, Ibaraki 305–0044
Þ
ÞOhtsuka Ceramics Inc., 482–1, Hanya, Shimotsumashi, Ibaraki 304–0005
Þ
Ammonium hydroxide was used at 10‹ as the precipitant to synthesize thin ‰akes of yttrium hydroxide, ag
C
glomerating in a manner resembling houses of card. One mol÷ to 50 mol÷ of ammonium sulfate was added
to the yttrium hydroxide. Doping of sulfate ion resulted in yttria particles with round edges, in contrast to
undoped yttria particles with sharp edges. The amount of doped sulfer was reduced to S/Y10|3 by calcina
tions at 1100‹ and to trace by sintering at 1700‹ Doping of 10 mol÷ of ammonium sulfate resulted in the
C, C.
maximum transparency in those of the yttria ceramics. Transparency of the yttria ceramics related to brittle
ness of agglomerate of the calcined powder which was evaluated by collapsing tendency of the agglomerates
by ultrasonic dispersion. [Received December 24, 2002; Accepted July 24, 2003]
Keywords : Yttria, Sulfate ion, Yttrium hydroxide, Lowtemperature synthesis, Houses of card, Densiˆcation, Trans
parency
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Fig. 1. Typical SEM micrograph showing the morphology of the
precursor.
Table 1. Chemical Analysis on the Undoped, the 5 mol÷ and the
10 mol÷ SO42|Doped Precursors
Fig. 2. Five weight loss curves of the precursors, yttrium sulfate
and yttrium nitrate.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)