JP6895476B2 - プラズマ処理装置用の部材、及び当該部材を備えるプラズマ処理装置 - Google Patents
プラズマ処理装置用の部材、及び当該部材を備えるプラズマ処理装置 Download PDFInfo
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- JP6895476B2 JP6895476B2 JP2019072008A JP2019072008A JP6895476B2 JP 6895476 B2 JP6895476 B2 JP 6895476B2 JP 2019072008 A JP2019072008 A JP 2019072008A JP 2019072008 A JP2019072008 A JP 2019072008A JP 6895476 B2 JP6895476 B2 JP 6895476B2
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- tungsten carbide
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Description
(相I)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする炭化物相
(相II)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする窒化物相
(相III)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする炭窒化物相
(相IV)炭素相
(相V)WxMyCzの式で表される複合炭化物相(但し、Mは鉄族元素、Cは炭素、Wはタングステンを示し、x、y、zは、それぞれ独立に0を超える数値を示す。)
相II:Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする窒化物相
相III:Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする炭窒化物相
相IV:炭素相
相V:WxMyCzの式で表される複合炭化物相(但し、Mは鉄族元素、Cは炭素、Wはタングステン、を示し、x、y、zは、それぞれ独立に0を超える数値を示す。)
[焼結体の作製]
市販のWC粉末(平均粒子径:0.6μm)を準備した。WC粉末と、副相を形成するための原材料と、メタノールとをバインダレス超硬ライニングポットに入れ、ボールミル(回転数:64rpm)によって粉砕し、混合粉末を調整した。ボールミルのボールはバインダレスの超硬合金製のものを用いた。混合粉末を所定のサイズの金型に入れ、プレス機を用いて100MPaで加圧して成形体を作製した。この成形体を、真空下、2200℃で2時間焼成した。なお、この温度は、工業的に大量生産可能な真空焼結温度の上限に近い。その後、1700℃、200MPaの条件でHIP処理を行って、実施例1〜20の焼結体を得た。
実施例1〜20の焼結体はいずれも導電性を有し、機械的強度(3点曲げ抗折力)は700〜1800MPaの範囲にあった。
市販の粉末を用いて表2に示す組成を有する試料(焼結体)を作製した。比較例1は、プラズマ処理装置の処理容器内で種々の部材として使用されているシリコン製のものである。シリコン製の部材は、強度が低く、プラズマによりエッチングされやすい。
市販の炭化タングステン粉末とCo粉末とを混合して、焼結体を得た。焼結体における炭化タングステン相の割合は、約90体積%であった。副相として炭化物相が含まれていた。相対密度は、99.5%以上(気孔率0.5体積%以下)であった。
<プラズマエッチング処理>
各実施例及び各比較例の焼結体(部材)のプラズマエッチングの評価を以下の手順で行った。作製した焼結体の機械加工を行って、φ30mm×3mmのサイズの評価用試料を作製した。評価用試料の表面を鏡面加工した。そして、図2に示すように、焼結体1のうち、鏡面加工した表面の一部をカプトン製のマスキングテープ3でマスキングし、プラズマ処理装置を用いてプラズマエッチング処理を行った。
プラズマエッチング処理後、表面からマスキングテープ3を剥がし、非エッチング面とエッチング面の段差を輪郭形状測定機(商品名:サーフコム2800、株式会社東京精密製)を用いて測定して、エッチング深さDを求めた。
幾つかの実施例及び比較例の焼結体の非エッチング面とエッチング面の粗度(Ra)を測定し、エッチングによる面粗度変化を求めた。その結果は、表3に示すとおりであった。実施例の方が比較例よりも凹凸が少なく、パーティクルポケットを低減できていることが示唆されていた。
プラズマエッチング処理後のパーティクルの個数測定は、市販のパーティクルカウンターを用いて、JIS B 9921に基づいて行った。パーティクル個数の測定結果は、比較例1では概ね100個であった。これに対し、実施例1〜20及び比較例8は20〜100個の範囲であった。比較例3〜7については、パーティクルが100個超であった。
プラズマエッチングを行った焼結体を洗浄液(フッ化水素酸)で洗浄した。洗浄液を、ICP−MS法(融合結合プラズマ質量分析法)で分析することによって、金属汚染の評価を行った。分析対象の元素はNa,Mg,Al,K,Ca,Ti,Cr,Fe,Co,Ni,Cu,Zn,Wの13種類とした。
Claims (10)
- 炭化タングステン相と、前記炭化タングステン相中に分散され、下記(相I)、(相II)、(相III)、(相IV)、及び(相V)からなる群より選ばれる少なくとも一種を含む副相と、を有し、
前記炭化タングステン相の含有割合が99体積%以上であり、
前記副相の含有割合が1体積%以下であり、
気孔率が2体積%以下である、プラズマ処理装置用の部材。
(相I)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする炭化物相
(相II)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする窒化物相
(相III)Wを除く周期律表の4族、5族及び6族元素の少なくとも一種を構成元素とする炭窒化物相
(相IV)炭素相
(相V)WxMyCzの式で表される複合炭化物相(但し、Mは鉄族元素、Cは炭素、Wはタングステンを示し、x、y、zは、それぞれ独立に0を超える数値を示す。) - 前記副相が前記(相V)の前記複合炭化物相を含み、当該複合炭化物相がW3Co3C相及びW3Ni3C相の一方又は双方を含有する、請求項1に記載の部材。
- 前記副相が前記(相I)、(相II)及び(相III)からなる群より選ばれる少なくとも一つを含み、
前記(相I)、(相II)及び(相III)における前記構成元素が、Cr、Ta、V及びNbからなる群より選ばれる少なくとも一つを含む、請求項1又は2に記載の部材。 - 前記副相が前記(相I)を含み、
前記炭化タングステン相及び前記炭化物相のみからなる、請求項1〜3のいずれか一項に記載の部材。 - 前記副相が前記(相IV)を含み、
前記炭化タングステン相及び前記炭素相のみからなる、請求項1〜3のいずれか一項に記載の部材。 - 前記副相が前記(相V)を含み、
前記炭化タングステン相及び前記複合炭化物相のみからなる、請求項1〜3のいずれか一項に記載の部材。 - 前記副相が前記(相I)及び(相V)を含み、
前記炭化タングステン相、前記炭化物相、及び前記複合炭化物相のみからなる、請求項1〜3のいずれか一項に記載の部材。 - Fe原子、Co原子及びNi原子の含有量の合計が30〜3300原子ppmである、請求項1〜7のいずれか一項に記載の部材。
- Fe原子、Co原子及びNi原子のそれぞれの含有量が1650原子ppm以下である、請求項1〜8のいずれか一項に記載の部材。
- 請求項1〜9のいずれか一項に記載の部材を備えるプラズマ処理装置。
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