JP4641185B2 - Al2O3−La2O3−Y2O3−MgOセラミックおよびその製造方法 - Google Patents
Al2O3−La2O3−Y2O3−MgOセラミックおよびその製造方法 Download PDFInfo
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Description
少なくともAl2O3、La2O3、Y2O3、およびMgOの源を含む溶融物を提供する(たとえば、少なくともAl2O3、La2O3、Y2O3、およびMgOの源を溶融して、溶融物を提供する)工程と、
溶融物を冷却して、本発明によるガラスを含むガラスビーズを提供する工程であって、ガラスがTgを有する工程と、
ガラスビーズが合体して形状を形成するように、ガラスビーズをTgより高く加熱する工程と、
合体した形状を冷却して、物品を提供する工程とを含む。
少なくともAl2O3、La2O3、Y2O3、およびMgOの源を含む溶融物を提供する(たとえば、少なくともAl2O3、La2O3、Y2O3、およびMgOの源を溶融して、溶融物を提供する)工程と、
溶融物を冷却して、本発明によるガラスを含むガラスビーズを提供する工程であって、ガラスがTgを有する工程と、
ガラスビーズを破砕して、ガラス粉末を提供する工程と、
ガラス粉末が合体して形状を形成するように、ガラス粉末をTgより高く加熱する工程と、
合体した形状を冷却して、物品を提供する工程とを含む。
ガラスビーズを提供する工程であって、ガラスが、Al2O3と、La2O3と、Y2O3と、MgOとを含み(典型的には、本発明によるガラス)、ガラスがTgを有する工程と、
ガラスビーズが合体して形状を形成するように、ガラスビーズをTgより高く加熱する工程と、
合体した形状を冷却して、物品を提供する工程と、
ガラス物品を熱処理して、ガラスの少なくとも一部をガラスセラミックに変換し、ガラスセラミック物品を提供する工程とを含む。
ガラス粉末を提供する(たとえば、ガラス(たとえば、ガラスビーズ)を破砕してガラス粉末を提供する)工程であって、ガラスが、Al2O3と、La2O3と、Y2O3と、MgOとを含み(典型的には、本発明によるガラス)、ガラスがTgを有する工程と、
ガラス粉末が合体して形状を形成するように、ガラス粉末をTgより高く加熱する工程と、
合体した形状を冷却して、ガラス物品を提供する工程と、
ガラス物品を熱処理して、ガラスの少なくとも一部をガラスセラミックに変換し、ガラスセラミック物品を提供する工程とを含む。
「非晶質材料」とは、X線回折によって定められるような長い範囲の結晶構造が少しもなく、および/または、「示差熱分析」という名称のここで説明されるテストによって定められるようなDTA(示差熱分析)によって定められるような非晶質材料の結晶化に対応する発熱ピークを有する、溶融物および/または蒸気相から得られる材料を指し、
「セラミック」は、ガラス、結晶質セラミック、ガラスセラミック、およびそれらの組合せを含み、
「複合金属酸化物」とは、2つ以上の異なった金属要素と、酸素とを含む金属酸化物(たとえば、CeAl11O18、Dy3Al5O12、MgAl2O4、およびY3Al5O12)を指し、
「複合Al2O3・金属酸化物」とは、理論的酸化物ベースで、Al2O3と、Al以外の1つ以上の金属要素とを含む複合金属酸化物(たとえば、CeAl11O18、Dy3Al5O12、MgAl2O4、およびY3Al5O12)を指し、
「複合Al2O3・Y2O3」とは、理論的酸化物ベースで、Al2O3と、Y2O3とを含む複合金属酸化物(たとえば、Y3Al5O12)を指し、
「複合Al2O3・REO」とは、理論的酸化物ベースで、Al2O3と、希土類酸化物とを含む複合金属酸化物(たとえば、CeAl11O18およびDy3Al5O12)を指し、
「ガラス」とは、ガラス転移温度を示す非晶質材料を指し、
「ガラスセラミック」とは、ガラスを熱処理することによって形成された結晶を含むセラミックを指し、
「Tg」とは、「示差熱分析」という名称のここで説明されるテストによって定められるようなガラス転移温度を指し、
「Tx」とは、「示差熱分析」という名称のここで説明されるテストによって定められるような結晶化温度を指し、
「希土類酸化物」とは、酸化セリウム(たとえば、CeO2)、酸化ジスプロシウム(たとえば、Dy2O3)、酸化エルビウム(たとえば、Er2O3)、酸化ユウロピウム(たとえば、Eu2O3)、ガドリニウム(たとえば、Gd2O3)、酸化ホルミウム(たとえば、Ho2O3)、酸化ランタン(たとえば、La2O3)、酸化ルテチウム(たとえば、Lu2O3)、酸化ネオジム(たとえば、Nd2O3)、酸化プラセオジム(たとえば、Pr6O11)、酸化サマリウム(たとえば、Sm2O3)、テルビウム(たとえば、Tb2O3)、酸化トリウム(たとえば、Th4O7)、ツリウム(たとえば、Tm2O3)、および酸化イッテルビウム(たとえば、Yb2O3)、およびそれらの組合せを指し、
「REO」とは、希土類酸化物を指す。
本発明による研磨粒子をワークピースの表面と接触させる工程と、
本発明による研磨粒子または接触表面の少なくとも一方を移動させて、表面の少なくとも一部を、本発明による研磨粒子の少なくとも1つで研磨する工程とを含む方法を提供する。
250mlのポリエチレンボトル(直径7.3cm)に、さまざまな粉末の50グラム混合物(表1(下記)の実施例ごとに規定されたように、表2(下記)に記載された原料源を用いる)、イソプロピルアルコール75グラム、およびアルミナミリングメディア(形状が円筒形、高さおよび直径の両方とも0.635cm、99.9%アルミナ、コロラド州ゴールデンのクアーズ(Coors, Golden CO)から得られる)200グラムを投入した。ポリエチレンボトルの中身を、60毎分回転数(rpm)で16時間ミリングした。ミリング後、ミリングメディアを除去し、スラリーを温かい(約75℃)ガラス(「パイレックス(PYREX)」)パン上に層に注ぎ、乾燥させ冷却させた。材料の比較的薄い層(すなわち、厚さ約3mm)および温かいパンによって、スラリーは、5分以内にケークを形成し、約30分で乾燥した。乾燥材料を、ペイントブラシの助けで、70メッシュのスクリーン(212マイクロメートルの開口部サイズ)を通してスクリーニングすることによって、粉砕した。
実施例17〜20のビーズを、使用された原料の量および源が、それぞれ表4(下記)および表1(上記)に記載されている以外は、実施例および参考例1〜16について上述されたように準備した。パーセント非晶質収率を、結果として生じる火炎形成ビーズから、実施例および参考例1〜16について用いられた方法と同じ方法を用いて計算した。DTAを、実施例12について上述されたように行った。実施例17〜20のパーセント非晶質収率データおよびガラス転移(Tg)温度およびガラス結晶化(Tx)温度は、下記表4に記載されている。
Claims (4)
- Al2O3と、La2O3と、Y2O3と、MgOとを含むガラスであって、前記ガラスの総重量を基準にして、前記ガラスの少なくとも70重量パーセントが、合計で、前記Al2O3と、前記La2O3と、前記Y2O3と、前記MgOとを含み、前記Al2O3、La2O3、Y2O3およびMgOの合計重量の少なくとも70重量パーセントが、Al2O3であり、前記ガラスの総重量を基準にして、3重量パーセント以下のSiO2を含む、ガラス。
- ガラスセラミックであって、前記ガラスセラミックが、Al2O3と、La2O3と、Y2O3と、MgOとを含み、前記ガラスセラミックの総重量を基準にして、前記ガラスセラミックの少なくとも70重量パーセントが、合計で、前記Al2O3と、前記La2O3と、前記Y2O3と、前記MgOとを含み、前記Al2O3、La2O3、Y2O3およびMgOの合計重量の少なくとも70重量パーセントが、Al2O3であり、前記ガラスセラミックが、平均微結晶サイズ1マイクロメートル未満の微結晶を含む微細構造を示し、前記ガラスセラミックが、共晶微細構造の特徴がなく、前記Y2O3の少なくとも一部が、別個の結晶質相として存在する、ガラスセラミックであって、前記ガラスセラミックが、前記ガラスセラミックの総重量を基準にして、3重量パーセント以下のSiO 2 を含む、ガラスセラミック。
- 前記ガラスセラミックが、平均微結晶サイズ200ナノメートル未満の微結晶を含む微細構造を示し、密度が理論密度の少なくとも90%である、請求項2に記載のガラスセラミック。
- 請求項2または請求項3に記載のガラスセラミックを含む研磨粒子。
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US10/358,855 US7258707B2 (en) | 2003-02-05 | 2003-02-05 | AI2O3-La2O3-Y2O3-MgO ceramics, and methods of making the same |
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2003
- 2003-02-05 US US10/358,855 patent/US7258707B2/en not_active Expired - Fee Related
- 2003-12-16 WO PCT/US2003/040395 patent/WO2004071990A2/en active Application Filing
- 2003-12-16 EP EP03815919A patent/EP1594810A2/en not_active Withdrawn
- 2003-12-16 AU AU2003301066A patent/AU2003301066A1/en not_active Abandoned
- 2003-12-16 CA CA002515183A patent/CA2515183A1/en not_active Abandoned
- 2003-12-16 KR KR1020057014331A patent/KR20050095888A/ko not_active Application Discontinuation
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Publication number | Publication date |
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JP2006514910A (ja) | 2006-05-18 |
WO2004071990A2 (en) | 2004-08-26 |
WO2004071990A3 (en) | 2005-02-03 |
EP1594810A2 (en) | 2005-11-16 |
AU2003301066A1 (en) | 2004-09-06 |
AU2003301066A8 (en) | 2004-09-06 |
US7258707B2 (en) | 2007-08-21 |
CA2515183A1 (en) | 2004-08-26 |
US20040148870A1 (en) | 2004-08-05 |
KR20050095888A (ko) | 2005-10-04 |
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