JP7224096B2 - プラズマ処理装置用部品の溶射方法及びプラズマ処理装置用部品 - Google Patents
プラズマ処理装置用部品の溶射方法及びプラズマ処理装置用部品 Download PDFInfo
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Description
まず、プラズマ処理装置1の一例について、図1を参照しながら説明する。本実施形態にかかるプラズマ処理装置1は、容量結合型の平行平板プラズマ処理装置であり、略円筒形の処理容器(チャンバ)2を有している。処理容器2の内面には、アルマイト処理(陽極酸化処理)が施されている。処理容器2の内部は、プラズマによりエッチング処理や成膜処理等のプラズマ処理が行われる処理室となっている。
次に、本実施形態に係る静電チャック10の具体的構成について、図2を参照しながら順に説明する。まず、図2(a)の本実施形態に係る静電チャック10の構成の一例について説明する。静電チャック10は、アルミナセラミックス(Al2O3)の焼結材であり、基材12の上に配置される。基材12は、外周側に段差部があり、段差部に環状のフォーカスリング11が載置されるようになっている。基材12は、アルミニウムから形成され、その外周側の段差部を含む基材12の側壁は、アルミナ(Al2O3)の溶射セラミックス121により被覆されている。なお、アルミナ(Al2O3)の代わりにイットリア(Y2O3)を用いてもよい。
上記接着層122の露出部分は、100μm~300μm程度の幅である。そのような峡部に溶射により溶射膜123を成膜するためには、102μmのオーダーの幅で溶射可能なプラズマ溶射装置150を使用する。以下、本実施形態に係るプラズマ溶射装置150の構成の一例について、図3及び図4を参照しながら説明する。
かかる構成の本実施形態に係るプラズマ溶射装置150では、図4(b)に示すように、供給部50のノズル51とプラズマジェットPとの軸芯を共通にする構造となっている。これにより、アルミナ粉末R1の噴出方向をプラズマジェットPの進行方向と同一にすることができる。つまり、プラズマジェットPと同一軸でアルミナ粉末R1が供給される。これにより、溶射の指向性を高め、マスクを介して基材12と静電チャック10の間の接着層122の面に102μmのオーダーの幅のアルミナセラミックスの溶射膜123を形成することができる。溶射膜123は、厚さが5μm~20μmの薄膜である。
以下、プラズマ溶射装置150を使用して成膜したアルミナセラミックスの溶射膜123に関する実験結果について、図5~図9を参照しながら説明する。
まず、本実施形態に係る溶射膜123の膜質及び密着性の実験結果の一例について、図5を参照しながら説明する。本実験では、プラズマ溶射装置150を使用して、図5(a)に示すシリコーンのピース12Pの上に幅が20μmの溶射膜123を成膜した。このときの溶射膜123の表面のSEM画像を図5(b)の上段に示し、断面のSEM画像を図5(b)の下段に示す。これによれば、粒子径が15μm以下のアルミナの溶射材料が溶けて液状となり、緻密なアルミナセラミックスの溶射膜123が形成されていることがわかる。また、図5(b)の下段の断面SEM画像により、下地のシリコーンのピース12Pの上にアルミナセラミックスの溶射膜123が密着していることがわかる。よって、本実施形態にかかるプラズマ溶射により、膜質がよく、かつ下地層との密着性が高い溶射膜123を生成できることがわかった。
次に、本実施形態に係る溶射膜123の耐食性の実験結果の一例について、図6を参照しながら説明する。本実験では、シリコーンのピース12Pの上に幅が20μmの溶射膜123を成膜した後、そのシリコーンのピース12Pを図1のプラズマ処理装置1内の載置台3に載置させる。この状態で、プラズマ処理装置1内にてO2プラズマを生成する。本実験の結果、O2プラズマ中の主にO2ラジカルの作用により、溶射膜123を成膜した部分以外のプラズマに露出したシリコーン12pは消耗する。一方、溶射膜123を成膜した部分(膜厚が約14.5μmの部分)のシリコーン12pは消耗していないことがわかる。以上から、本実施形態に係る溶射膜123は、接着層122のプラズマに露出する面を覆うことで、接着層122がプラズマの作用により消耗することを防止できる。
次に、本実施形態に係る溶射膜123のパターン幅の実験結果の一例について、図7を参照しながら説明する。本実験では、図7(a)に示すように、本実施形態に係るプラズマ溶射装置150から噴出される溶射材料は、液状になってマスク125を介してマスク125に形成されたスリット(開口)のパターンに溶射される。
次に、本実施形態に係る接着層122の種類について、図8を参照しながら説明する。スリットが150μmのマスク125を介して溶射膜123を成膜する場合、接着層122の種類が、シリコーン樹脂、アクリル樹脂、エポキシ樹脂のいずれの場合にも、各樹脂上にスリット150μmに応じた幅の溶射膜123を成膜できることが確認されている。
次に、本実施形態に係るマスク125を介した溶射方法について、図9を参照しながら説明する。本実施形態にかかるマスク125は、ポリイミド等のシリコーン樹脂、アクリル樹脂、エポキシ樹脂等の樹脂マスク、樹脂繊維マスク及び金属マスクを使用できる。
2 処理容器(チャンバ)
3 載置台
10 静電チャック
10a 電極層
10b 誘電層
11 フォーカスリング
12 基材
12a 冷媒流路
17 ゲートバルブ
20 ガスシャワーヘッド
20a 本体部
20b 天板
21 シールドリング
22 ガス導入口
23 ガス供給源
25 ガス供給孔
30 直流電源
31 スイッチ
32 第1高周波電源
33 第1整合器
34 第2高周波電源
35 第2整合器
36 チラー
37 伝熱ガス供給源
38 排気装置
100 制御装置
121 溶射セラミックス
122 接着層
123,124 溶射膜
125 マスク
150 プラズマ溶射装置
50 供給部
51 ノズル
51a 流路
51b 開口
52 本体部
52b 凹み部
52d 張出部
60 フィーダー
61 容器
62 アクチュエータ
101 制御部
40 ガス供給部
41 ガス供給源
47 直流電源
65 プラズマ生成部
70 チラーユニット
80 ステージ
83 回収廃棄機構
88 ドライ室
C チャンバ
U プラズマ生成空間
Claims (9)
- プラズマ処理装置用部品の溶射方法であって、
プラズマ生成部にて50kW以下の電力によりプラズマ生成ガスからプラズマジェットを生成する工程と、
15μm以下の粒子径を有する溶射材料の粉末を、前記プラズマ生成ガスとともにノズルの先端部から該ノズルと軸芯が共通する前記プラズマジェットに噴射する工程と、
噴射した前記溶射材料の粉末を前記プラズマジェットにより液状にし、マスクを介して前記プラズマ処理装置用部品である静電チャックと基材と樹脂層とにより定義される凹部の前記樹脂層の表面に直に接触し、かつ、前記表面を覆うように溶射する工程と、
を有するプラズマ処理装置用部品の溶射方法。 - 前記溶射する工程は、前記液状の溶射材料を100μm~300μmの幅に成膜する、
請求項1に記載の溶射方法。 - 前記溶射する工程は、前記液状の溶射材料を5μm~20μmの厚さに成膜する、
請求項1又は2に記載の溶射方法。 - 前記マスクは、前記樹脂層の表面の一部又は全部に対応して開口するように配置される物理マスク又は前記樹脂層の表面の全部に対応して開口するように塗布される塗布マスクである、
請求項1~3のいずれか一項に記載の溶射方法。 - 前記溶射材料は、金属酸化物又は金属窒化物を含む金属無機材料である、
請求項1~4のいずれか一項に記載の溶射方法。 - 前記溶射材料は、アルミナ(Al2O3)又はイットリア(Y2O3)である、
請求項5に記載の溶射方法。 - 前記請求項1~6のいずれか一項に記載の溶射方法を用いて、プラズマ処理装置用部品に設けられた樹脂層の表面に100μm~300μmの幅で液状の溶射材料を溶射するプラズマ処理装置用部品の製造方法。
- プラズマ生成部にて50kW以下の電力によりプラズマ生成ガスからプラズマジェットを生成する工程と、
15μm以下の粒子径を有する溶射材料の粉末を、前記プラズマ生成ガスとともにノズルの先端部から該ノズルと軸芯が共通する前記プラズマジェットに噴射する工程と、
噴射した前記溶射材料の粉末を前記プラズマジェットにより液状にし、マスクを介してプラズマ処理装置用部品である静電チャックと基材と樹脂層とにより定義される凹部の前記樹脂層の表面に直に接触し、かつ、前記表面を覆うように溶射する工程と、を有し、
前記マスクは、前記樹脂層の表面の一部又は全部に対応して開口するように配置される物理マスク又は前記樹脂層の表面の全部に対応して開口するように塗布される塗布マスクであり、
前記溶射材料は、アルミナ(Al2O3)又はイットリア(Y2O3)であり、
前記溶射する工程は、前記液状の溶射材料を100μm~300μmの幅であって5μm~20μmの厚さに成膜する、溶射方法。 - 請求項8に記載の溶射方法により溶射するプラズマ処理装置用部品の製造方法。
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