JPWO2013065666A1 - ガスノズル、これを用いたプラズマ装置およびガスノズルの製造方法 - Google Patents
ガスノズル、これを用いたプラズマ装置およびガスノズルの製造方法 Download PDFInfo
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Abstract
本発明は、パーティクルの脱落を低減する要求に応えるガスノズルを提供するものである。
【解決手段】
本発明の一態様に係るガスノズル4は、ガスが流れる貫通孔12が形成されたセラミック焼結体からなる柱状の本体13を備え、本体13の一端面S1には、貫通孔12におけるガスの排出口15が形成されており、一端面S1における輪郭曲線要素の平均長さ(Rsm)は、セラミック焼結体における平均結晶粒径の5倍以上であることを特徴とするものである。
Description
以下に、本発明の一実施形態によるガスノズルについて、図1および2を参照して詳細に説明する。
次に、本実施形態によるガスノズルの製造方法の一例を説明する。このガスノズルの製造方法は、本体13となるセラミック焼結体を作製する工程と、所望の形状の本体13を得るため、セラミック焼結体を加工する工程とを備えている。
まず、本体13をイットリア焼結体で形成する場合について以下に説明する。
本体用焼結体13の形状を所望のものとするための加工について、以下に説明する。
表1に示すように、各種セラミック焼結体および加工方法を用いて試料1〜15のガスノズルを作製し、各ガスノズルについて、キーエンス社製のデジタルマイクロスコープ装置を用いて、表面観察することによって、本体の一端面における平均結晶粒径(D)を測定した。また、各ガスノズルについて、小坂研究所社製の表面粗さ装置を用いて、表面状態を測定することによって、本体の一端面における輪郭曲線要素の平均長さ(Rsm)および算術平均粗さ(Ra)を測定した。また、各ガスノズルについて、アネルバ社製のプラズマエッチング装置を用いて、プラズマエッチング評価することによって、耐プラズマ性を評価した。なお、耐プラズマ性は、試料1を基準とした相対値を用いており、数値が小さいと耐プラズマ性が高い。
まず、イットリア焼結体(試料1〜6)およびスピネル焼結体(試料7〜12)を作製した。
表1に示すように、第1ラップ加工のみを行った試料1〜3、7〜9では、Rsm/Dが2倍以上4倍以下と小さくなっているのに対し、第1ラップ加工に加えて第2ラップ加工を行った試料4〜6、10〜12は、Rsm/Dが7倍以上20倍以下と大きくなっていた。そして、セラミック焼結体としてイットリア焼結体を用いた試料において、第1ラップ加工に加えて第2ラップ加工を行った試料4は、第1ラップ加工のみを行った試料1と比較して、耐プラズマ性が向上していた。また、セラミック焼結体としてスピネル焼結体を用いた試料において、第1ラップ加工に加えて第2ラップ加工を行った試料10は、第1ラップ加工のみを行った試料7と比較して、耐プラズマ性が向上していた。
2 反応室
3 ガス導入管
4 ガスノズル
5 基板
6 基板保持部
7 内部電極
8 バイアス電源
9 コイル
10 電源
12 貫通孔
13 本体
14 供給口
15 排出口
17 研磨材
18 ラップ盤
19 治具
Claims (11)
- ガスが流れる貫通孔が形成されたセラミック焼結体からなる柱状の本体を備え、
前記本体の一端面には、前記貫通孔における前記ガスの排出口が形成されており、
前記一端面における輪郭曲線要素の平均長さ(Rsm)は、前記セラミック焼結体における平均結晶粒径の5倍以上であることを特徴とするガスノズル。 - 請求項1に記載のガスノズルにおいて、
前記一端面における算術平均粗さ(Ra)は、0.05μm以下であることを特徴とするガスノズル。 - 請求項1に記載のガスノズルにおいて、
前記一端面における輪郭曲線要素の平均長さ(Rsm)は、前記セラミック焼結体における平均結晶粒径の100倍以下であることを特徴とするガスノズル。 - 請求項1に記載のガスノズルにおいて、
前記本体の前記一端面に接続した側面における輪郭曲線要素の平均長さ(Rsm)は、前記セラミック焼結体における平均結晶粒径の5倍以上であることを特徴とするガスノズル。 - 請求項4に記載のガスノズルにおいて、
前記排出口は、前記本体に複数形成されており、且つ前記側面にも形成されていることを特徴とするガスノズル。 - 請求項1に記載のガスノズルにおいて、
前記セラミック焼結体の主成分は、イットリアであることを特徴とするガスノズル。 - 請求項1に記載のガスノズルにおいて、
前記セラミック焼結体の主成分は、スピネルであることを特徴とするガスノズル。 - 請求項7に記載のガスノズルにおいて、
前記セラミック焼結体は、カルシウムおよびジルコニウムの少なくとも一方を含むことを特徴とするガスノズル。 - 反応室と、
該反応室内にガスを供給する請求項1に記載のガスノズルと、
前記ガスを放電によってプラズマ化させる放電手段とを備えたことを特徴とするプラズマ装置。 - 貫通孔が形成されたセラミック焼結体からなる柱状の本体用焼結体を準備する工程と、
前記本体用焼結体の一端面に、第1研磨材を用いて第1ラップ加工を行なう工程と、
該第1ラップ加工を行なった前記本体用焼結体の前記一端面に、前記第1研磨材よりも硬度が小さい第2研磨材を用いて第2ラップ加工を行なうことによって、ガスが流れる前記貫通孔が形成された前記セラミック焼結体からなる柱状の本体を作製する工程とを備えたことを特徴とするガスノズルの製造方法。 - 請求項10に記載のガスノズルの製造方法において、
前記本体用焼結体を準備する工程では、
前記本体用焼結体としてイットリアまたはスピネルを主成分とするセラミック焼結体からなるものを用いて、
前記第1ラップ加工を行なう工程では前記第1研磨材としてダイヤモンド研磨材を用いて、
前記本体を作製する工程では前記第2研磨材としてアルミナ研磨材を用いることを特徴とするガスノズルの製造方法。
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