JP5159310B2 - 耐食性部材、これを用いた処理装置 - Google Patents
耐食性部材、これを用いた処理装置 Download PDFInfo
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- JP5159310B2 JP5159310B2 JP2007533276A JP2007533276A JP5159310B2 JP 5159310 B2 JP5159310 B2 JP 5159310B2 JP 2007533276 A JP2007533276 A JP 2007533276A JP 2007533276 A JP2007533276 A JP 2007533276A JP 5159310 B2 JP5159310 B2 JP 5159310B2
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- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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Description
るα−Al2O3結晶の(116)面および(104)面に帰属するピーク強度をそれぞれI116およびI104としたとき、ピーク強度比I116/I104の値が1.21以上1.98以下である、耐食性部材が提供される。
2 α−Al2O3結晶
3 YAG結晶
4 誘導結合型プラズマエッチング装置(処理装置)
40 下部チャンバ(処理容器の一部)
41 蓋(処理容器の一部)
び(104)面に帰属するピーク強度をそれぞれI116およびI104としたとき、ピーク強度比I116/I104の値が1.21以上1.98以下とされている。すなわち、α−Al2O3結晶は、従来のα−Al2O3焼結体のピーク強度を示す(104)面から、(116)面に多く結晶配向させられている。このようなピーク強度比I116/I104の値を有する耐食性部材は、詳細については後述するが、α−Al2O3粉末として微細な粉末(たとえば平均粒径が0.1μm以上1.2μm以下の粉末)を用いるとともに、YAG源としてイットリア粉末を用いて成形体を形成し、この成形体を焼成することにより形成することができる。
Committee of Powder Diffraction Standards)カードに記載されているように、α−Al2O3焼結体(Corundum)のX線回折チャートでは、(104)面に第1ピークが存在し、その他のピークはその89%以下のピーク強度である((104)面を100%とすると、(116)面の第2ピークは89%である)。
これは、本発明の耐食性部材は、成形体を形成するための材料として、α−Al2O3粉末として微細な粉末(たとえば平均粒径が0.1μm以上1.2μm以下の粉末)を用いるとともに、YAG源としてY2O3粉末を用いているためであると考えられる。
すなわち、α−Al2O3粉末として従来よりも微粒なものを用いることにより、従来とはα−Al2O3結晶の形状が異なり、また、YAG源として従来のようにY2O3前駆体を用いたため、それらの影響でYAG結晶がα−Al2O3結晶に適切に隣接した状態で存在し、(116)面に第1ピークが存在するものとなっていると推察される。
.5μm以上8μm以下とすることにより、耐食性部材1をより微細で緻密な組織構造を有するものとし、さらに耐食性および機械的特性を向上させることができる。
り算出したBET比表面積が1〜9m2/gのものを用いることが好ましい。また、α−Al2O3の1次原料は、粒径が0.1μm以上1.2μm以下とされる。α−Al2O3の1次原料の粒径が0.1μm未満となると、Y2O3粉末と混合した際にY2O3粉
末の分散性が悪く、焼結体中のYAG結晶粒子の分散性も悪くなり焼結体の機械的特性が低下し、またα−Al2O3粉末を微細化する必要があるために製造コストが高くなる。その一方で、α−Al2O3の1次原料の粒径が1.2μmを越えると、α−Al2O3
の微粒化による耐食性部材のα−Al2O3結晶からなる部位のX線回折における(116)面への結晶配向性が得られなくなり、(116)面と(104)面とのピーク強度比I116/I104の値が1.21以上1.98以下の範囲内とできず、良好な機械的特性を維持することが困難となる。したがって、α−Al2O3の1次原料として粒径が上
記した範囲のものを用いることにより、耐食性部材の表層部におけるピーク強度比I116/I104の値を1.21以上1.98以下の範囲とすることができる。
13.56MHzのマイクロ波が印加される。
まず、1次原料として、α−Al2O3粉末およびY2O3粉末を準備した。α−Al2O3粉末としては、市販のα−Al2O3原料を更に振動ミルにて微粉砕した純度99.5%以上、平均結晶粒径0.8μmのものを準備した。一方、Y2O3粉末としては、市販の純度99.9%、平均結晶粒径2μmのものを準備した。
ピーク強度比I116/I104は、円板状の試料の表面を、X線回折装置(理学製 RINT1400V型)によりX線回折測定したときに得られる回折チャートに基づいて算出した。すなわち、ピーク強度比I116/I104は、回折チャートからα−Al2O3のX線回折における(116)面に帰属するピーク強度I116と(104)面に帰属するピーク強度I104のそれぞれを算出するとともに、それらのピーク強度の比率から算出した。各試料No.1〜No.8のピーク強度比I116/I104の算出結果については、表1に示した。
密度は、アルキメデス法に基づいて、抗折試験片サイズの各試料No.1〜No.8を用いて測定した。密度の測定結果については、表1に示した。
4点曲げ強度は、JIS R1601−1995に準拠して、それぞれ抗折試験片サイズの試料No.1〜No.8を用いて測定を行なった。各組成の試料No.1〜No.8については、4点曲げ強度を試験片30本について測定し、その平均値を算出して表1に示した。
耐食性は、円板状の試料No.1〜No.8をRIE(Reactive Ion Etching)装置にセットしてCl2ガス雰囲気下でプラズマ中に3時間曝露し、その前後の重量減少量から1分間当たりのエッチングレート(Å/min)として算出した。エッチングレートの算出結果については、比較例1の純度99.5%のアルミナ質焼結体のエッチングレートを1としたときの相対比較値(エッチングレート比)として表1に示した。
表1から分かるように、本発明範囲内の試料No.5〜No.7については、機械的特性、耐食性ともに良好であった。
平均結晶粒径は、円板状の試料の表面を化学エッチングした後、SEM分析により表面写真を撮影し、そのときのSEM写真に基づいて、複数のα−Al2O3結晶とYAG結晶の結晶粒径を測定するとともに、それらの結晶粒径の平均値として算出した。平均結晶粒径の測定結果については、表2に示した。表2においては、α−Al2O3結晶の平均粒径に対するYAG結晶の平均粒径の比率を算出した結果についても同時に示した。
密度は、実施例1と同様に、アルキメデス法に基づいて、抗折試験片サイズの各試料を用いて測定した。密度の測定結果については、表2に示した。
機械的特性は、4点曲げ強度および破壊靭性として評価した。4点曲げ強度は、実施例1と同様にして測定した。破壊靭性は、JIS R1607−1995に準拠して、抗折試験片サイズの試料を用いて測定した。各試料については、4点曲げ強度および破壊靭性を試験片30本について測定し、その平均値を算出して表2に示した。
耐食性は、実施例1と同様にエッチングレート(Å/min)として評価し、純度99.5%のアルミナ質焼結体(比較例4)のエッチングレートを1としたときの相対比較値(エッチングレート比)として表2に示した。
表2より、本発明範囲内である試料No.10〜No.12、No.14、No.17〜No.21、No.23、No.24については、他機械的特性および耐食性ともに良好な結果が得られた。
Claims (2)
- α−Al2O3結晶およびYAG(イットリウム・アルミニウム・ガーネット)結晶を有する焼結体からなり、AlをAl2O3換算で70質量%以上98質量%以下、YをY2O3換算で2質量%以上30質量%以下含有しており、前記α−Al 2 O 3 結晶の平均結晶粒径が1μm以上10μm以下であり、前記YAG結晶の平均結晶粒径が前記α−Al 2 O 3 結晶の平均結晶粒径の10%以上80%以下の大きさで、かつ0.5μm以上8μm以下であり、前記焼結体の表層部のX線回折におけるα−Al2O3結晶の(116)面および(104)面に帰属するピーク強度をそれぞれI116およびI104としたとき、ピーク強度比I116/I104の値が1.21以上1.98以下である、耐食性部材。
- 処理容器内に載置した試料に対して、腐食性ガスまたはそのプラズマにより試料にエッチングや成膜などの処理を施す際に用いられる部材の少なくとも一部が、請求項1に記載の耐食性部材により形成されている、処理装置。
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JP2010174325A (ja) * | 2009-01-29 | 2010-08-12 | Kyocera Corp | 放電用電極体、放電用電極アセンブリおよび放電処理装置 |
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US20080283499A1 (en) | 2008-11-20 |
WO2007026739A1 (ja) | 2007-03-08 |
US8357262B2 (en) | 2013-01-22 |
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