JP7828360B2 - 半導体製造装置用部材 - Google Patents
半導体製造装置用部材Info
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Description
AlNセラミック基体の表面にウエハ載置用の突起が設けられた半導体製造装置用部材であって、
前記AlNセラミック基体のうち前記突起の設けられていない部分の少なくとも一部は、前記表面から所定深さまでの表層領域と、前記表層領域よりも下側の母材領域とを有し、前記所定深さは5μm以下であり、前記表層領域の酸素含有率は、前記母材領域の酸素含有率よりも高いものである。
電極を内蔵しない円板状のAlNセラミック基体(母材A,直径320mm、厚さ20mm)を以下のようにして作製した。まず、窒化アルミニウム粉末(純度99.7%)100質量部と、酸化イットリウム5質量部と、分散剤(ポリカルボン酸系共重合体)2質量部と、分散媒(多塩基酸エステル)30質量部とを、ボールミル(トロンメル)を用いて14時間混合することにより、セラミックスラリー前駆体を得た。このセラミックスラリー前駆体に対して、イソシアネート(4,4’-ジフェニルメタンジイソシアネート)4.5質量部、水0.1質量部、触媒(6-ジメチルアミノ-1-ヘキサノール)0.4質量部を加えて混合することにより、セラミックスラリーを得た。このセラミックスラリーを円板形状の内部空間を有する成形型に流し込み、イソシアネートと水との化学反応により有機バインダ(ウレタン樹脂)を生成させたあと、成形型から硬化した成形体を取り出した。その成形体を100℃で10時間乾燥し、脱脂及び仮焼を水素雰囲気下、最高温度1300℃で行い、セラミック仮焼体を得た。そのセラミック仮焼体を、窒素ガス中、プレス圧力250kgf/cm2 、1860℃で6時間、ホットプレス焼成することによりAlNセラミック基体を作製した。得られたAlNセラミック基体について、EDX分析によりN,O,Al,Yの質量%を求めた。また、AlNセラミック基体の色を目視で測定し、硬さをミツトヨ製マイクロビッカース硬さ測定機HM-211で測定した。それらの結果を表1に示す。
母材Aの表面をピコ秒レーザ加工機を利用してアブレーション加工した。ピコ秒レーザ加工機は、ガルバノミラーのモータとステージのモータを駆動させながら、基体表面を5μm間隔で平行に走査してアブレーション加工を行った。加工波長、走査速度、パルス幅及びレーザ出力は表1に示す値に設定し、周波数は200kHzに設定した。加工回数は2回とした。加工終了後、AlNセラミック基体の断面を調べたところ、表層領域(表面から0.5μmまでの黒く変質した領域)とその表層領域の下側の母材領域とに分かれていた。表層領域について、母材Aと同様にしてN,O,Al,Yの質量%を求めた。また、母材領域の酸素含有率に対する表層領域の酸素含有率の割合、母材領域の質量比O/Nに対する表層領域の質量比O/Nの割合、母材領域の質量比Al/Nに対する表層領域の質量比Al/Nの割合を求めた。更に、表層領域の色及び硬さを母材Aと同様にして測定した。それらの結果を表1に示す。表層領域の硬さは670Hvであり、母材領域の硬さ(523Hv)に比べて約1.28倍であった。このように実施例1の表層領域の硬さは母材A(参考例1)よりも硬くなったため、母材Aに比べてパーティクル抑制効果が向上する。また、実施例1の表層領域を走査電子顕微鏡(SEM)で観察したところ、ドロスは見られなかった。そのため、特許文献1に比べてパーティクル抑制効果が向上する。
母材Aと同じサイズの円板状のAlNセラミック基体(母材B)を、母材Aと同じ方法で作製した。得られたAlNセラミック基体について、母材Aと同様にしてN,O,Al,Yの質量%を求めた。母材Bは、母材Aとはロットが異なるため元素の質量%が異なっていた。また、AlNセラミック基体の色及び硬さを母材Aと同様にして測定した。それらの結果を表1に示す。
母材Bの表面をナノ秒レーザ加工機を利用してアブレーション加工した。ナノ秒レーザ加工機は、ガルバノミラーのモータとステージのモータを駆動させながら、基体表面を5μm間隔で平行に走査してアブレーション加工を行った。実施例2~4では、加工波長、走査速度、パルス幅及びレーザ出力をそれぞれ表1に示す値に設定し、周波数を50kHzに設定し、加工回数は1回とした。加工終了後、AlNセラミック基体の断面を調べたところ、表層領域とその表層領域の下側の母材領域とに分かれていた。実施例2の表層領域は表面から0.2μmまでの領域、実施例3の表層領域は表面から0.3μmまでの領域、実施例4の表層領域は表面から0.2μmまでの領域であった。実施例2~4の各表層領域について、母材Aと同様にしてN,O,Al,Yの質量%を求めた。また、母材領域の酸素含有率に対する表層領域の酸素含有率の割合、母材領域の質量比O/Nに対する表層領域の質量比O/Nの割合、母材領域の質量比Al/Nに対する表層領域の質量比Al/Nの割合を求めた。更に、表層領域の色及び硬さを母材Aと同様にして測定した。それらの結果を表1に示す。表層領域の硬さは650~690Hvであり、母材領域の硬さ(560Hv)に比べて約1.16~1.23倍であった。このように実施例2~4の各表層領域の硬さが母材B(参考例2)よりも硬くなったため、母材Bに比べてパーティクル抑制効果が向上する。また、実施例2~4の各表層領域を走査電子顕微鏡(SEM)で観察したところ、ドロスが見られなかった。そのため、特許文献1に比べてパーティクル抑制効果が向上する。
母材Aと同じサイズの円板状のAlNセラミック基体(母材C)を、母材Aと同じ方法で作製した。得られたAlNセラミック基体について、母材Aと同様にしてN,O,Al,Yの質量%を求めた。母材Cは、母材Aとはロットが異なるため元素の質量%が異なっていた。また、AlNセラミック基体の色及び硬さを母材Aと同様にして測定した。それらの結果を表1に示す。
母材Cの表面をピコ秒レーザ加工機を利用してアブレーション加工した。ピコ秒レーザ加工機は、ガルバノミラーのモータとステージのモータを駆動させながら、基体表面を5μm間隔で平行に走査してアブレーション加工を行った。実施例5,6では、加工波長、走査速度、パルス幅及びレーザ出力をそれぞれ表1に示す値に設定し、周波数を200kHzに設定し、加工回数は1回とした。加工終了後、AlNセラミック基体の断面を調べたところ、表層領域とその表層領域の下側の母材領域とに分かれていた。実施例5,6の表層領域はいずれも表面から0.5μmまでの領域であった。実施例5,6の各表層領域について、母材Aと同様にしてN,O,Al,Yの質量%を求めた。また、母材領域の酸素含有率に対する表層領域の酸素含有率の割合、母材領域の質量比O/Nに対する表層領域の質量比O/Nの割合、母材領域の質量比Al/Nに対する表層領域の質量比Al/Nの割合を求めた。更に、表層領域の色及び硬さを母材Aと同様にして測定した。それらの結果を表1に示す。表層領域の硬さは459.9~635.9Hvであり、母材領域の硬さ(413Hv)に比べて約1.11~1.54倍であった。このように実施例5,6の各表層領域の硬さが母材Cよりも硬くなったため、母材Cに比べてパーティクル抑制効果が向上する。また、実施例5,6の各表層領域を走査電子顕微鏡(SEM)で観察したところ、ドロスが見られなかった。そのため、特許文献1に比べてパーティクル抑制効果が向上する。
Claims (8)
- AlNセラミック基体の表面にウエハ載置用の突起が設けられた半導体製造装置用部材であって、
前記AlNセラミック基体のうち前記突起の設けられていない部分の少なくとも一部は、前記表面から所定深さまでの表層領域と、前記表層領域よりも下側の母材領域とを有し、前記所定深さは5μm以下であり、前記表層領域の酸素含有率は、前記母材領域の酸素含有率よりも高く、前記表層領域の窒素含有率は、前記母材領域の窒素含有率よりも低い、
半導体製造装置用部材。 - 前記表層領域の酸素含有率は、前記母材領域の酸素含有率の2.0倍以上である、
請求項1に記載の半導体製造装置用部材。 - 前記表層領域は、黒色化している、
請求項1又は2に記載の半導体製造装置用部材。 - 前記表層領域には、ドロスが見られない、
請求項1又は2に記載の半導体製造装置用部材。 - 前記表層領域の質量比O/Nは、前記母材領域の質量比O/Nよりも大きい値である、
請求項1又は2に記載の半導体製造装置用部材。 - 前記表層領域の質量比O/Nは、前記母材領域の質量比O/Nの2.2倍以上である、
請求項5に記載の半導体製造装置用部材。 - 前記表層領域の質量比Al/Nは、前記母材領域の質量比Al/Nよりも大きい値である、
請求項1又は2に記載の半導体製造装置用部材。 - 前記AlNセラミック基体のうち前記突起の設けられていない部分は、前記表層領域と前記母材領域とを有する、
請求項1又は2に記載の半導体製造装置用部材。
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| JP2012119378A (ja) | 2010-11-29 | 2012-06-21 | Kyocera Corp | 載置用部材およびその製造方法 |
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| US6861165B2 (en) * | 2000-02-24 | 2005-03-01 | Ibiden Co., Ltd. | Aluminum nitride sintered compact, ceramic substrate, ceramic heater and electrostatic chuck |
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| JP4753851B2 (ja) * | 2005-12-19 | 2011-08-24 | 日本碍子株式会社 | 窒化アルミニウム粉末、窒化アルミニウム質セラミックス焼結体、半導体製造装置用部材、窒化アルミニウム発光材料、及び窒化アルミニウム粉末の製造方法 |
| JP2007173596A (ja) * | 2005-12-22 | 2007-07-05 | Ngk Insulators Ltd | 静電チャック |
| US10631370B2 (en) * | 2015-10-30 | 2020-04-21 | Ngk Insulators, Ltd. | Member for semiconductor manufacturing apparatus, method for producing the same, and heater including shaft |
| JP6806051B2 (ja) * | 2015-10-21 | 2021-01-06 | 住友大阪セメント株式会社 | 静電チャック装置 |
| SG11202112198UA (en) * | 2019-05-03 | 2021-12-30 | Therm X Of California Inc | High temperature aluminum nitride heater with multi-zone capability |
| US11325866B2 (en) * | 2019-07-18 | 2022-05-10 | Ngk Spark Plug Co., Ltd. | Aluminum nitride sintered body, method of making the same, and semiconductor manufacturing equipment component using aluminum nitride sintered body |
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| JP2006064992A (ja) | 2004-08-26 | 2006-03-09 | Kyocera Corp | 液晶基板保持盤とその製造方法 |
| JP2010092976A (ja) | 2008-10-06 | 2010-04-22 | Ulvac Japan Ltd | 吸着力回復方法、吸着力低下防止方法 |
| JP2012119378A (ja) | 2010-11-29 | 2012-06-21 | Kyocera Corp | 載置用部材およびその製造方法 |
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