JP4476701B2 - 電極内蔵焼結体の製造方法 - Google Patents
電極内蔵焼結体の製造方法 Download PDFInfo
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- JP4476701B2 JP4476701B2 JP2004164415A JP2004164415A JP4476701B2 JP 4476701 B2 JP4476701 B2 JP 4476701B2 JP 2004164415 A JP2004164415 A JP 2004164415A JP 2004164415 A JP2004164415 A JP 2004164415A JP 4476701 B2 JP4476701 B2 JP 4476701B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 128
- 239000000843 powder Substances 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 45
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- 239000002994 raw material Substances 0.000 claims description 22
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- 238000007639 printing Methods 0.000 claims description 19
- 239000002003 electrode paste Substances 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 16
- 239000003870 refractory metal Substances 0.000 claims description 9
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 229910039444 MoC Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 7
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 claims description 6
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 6
- 229910052735 hafnium Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 229910052702 rhenium Inorganic materials 0.000 claims description 6
- 229910052703 rhodium Inorganic materials 0.000 claims description 6
- 229910052715 tantalum Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 2
- 230000003796 beauty Effects 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 69
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
本発明の実施の形態に係る電極内蔵焼結体は、アルミナ焼結体を形成し、アルミナ焼結体上に、高融点金属、炭化モリブデン、炭化タングステンのうちのいずれか1種以上を主成分とする電極ペーストを印刷し、電極ペースト上にアルミナ粉体を充填し、金形成形によりアルミナ粉体と電極ペーストとアルミナ焼結体とを一体化し、一体化したアルミナ粉体と電極ペーストとアルミナ焼結体とを焼成することによって、製造される。又、本発明の実施の形態に係る電極内蔵焼結体は、焼成温度1400〜1650℃とし、ホットプレス法により焼成することが望ましい。
図1(a)及び図1(b)は、本発明の実施の形態に係る静電チャック10の構造を示す概略的な平面図および断面図である。本発明の実施の形態に係る静電チャック10は、円盤状に加工されたセラミックス基材1と、セラミックス基材1の上に配置された薄いセラミックス誘電体層3と、セラミックス誘電体層3とセラミックス基材1との間に埋設された面状の電極2とを有する。セラミックス誘電体層3の表面が基板載置面であり、基板はここに載置され、固定される。
次に、図2(a)〜図2(c)を参照して、本発明の実施の形態に係る電極内蔵焼結体(静電チャック)の製造方法について説明する。
上述する本実施の形態に係る電極内蔵焼結体(静電チャック)の製造方法によれば、セラミックス誘電体層は、アルミナ成形体の焼成、及び、一体化したアルミナ粉体と電極ペーストとアルミナ焼結体の焼成という2回の焼成工程を経ることで、成形体の緻密化に伴う収縮変動が小さくなり、平坦度が良いセラミックス誘電体層を作製することができる。
本発明は上記の実施の形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかである。
(製作条件)
印刷ペーストの材質及びアルミナ粉体(焼成後のセラミックス基材1)のバインダの有無を変化させた静電チャックを製作し(実施例1,2,参考例1〜4)、体積抵抗率及び界面せん断強度を測定した。それぞれの製作条件を表1に示す。
評価結果を表1に示す。各評価の具体的な測定方法は、以下のとおりである。
(製作条件)
上述した実施例1における印刷ペーストのアルミナ添加量を変化させた静電チャックを製作し(参考例5,実施例3〜6)、体積抵抗率及び界面せん断強度を測定した。それぞれの製作条件を表2に示す。
結果を表2に示す。アルミナ添加量については、体積抵抗率が高く、界面せん断強度が130MPaである実施例3〜6が良好であった。即ち、アルミナ添加量は、5〜30重量%であることが望ましいことが分かった。尚、実施例6については、電極としての導通に問題があるので、より望ましくは、アルミナ添加量は5〜20重量%である。
(製作条件)
次に、粉体成形法と、本発明の焼成体使用法とを用い、焼成温度を変化させ、静電チャックを製作し(参考例6〜10,実施例7〜11)、膜厚レンジを測定した。それぞれの製作条件を表3に示す。
結果を表3に示す。ここで、平坦度とは、半導体ウェハ載置面の表面から電極までの最大距離と、最小距離の差である。
2 電極
3 セラミックス誘電体層
4 電極端子
5 成形用金型
10 静電チャック
11 セラミックス成形体
21 印刷電極
31 セラミックス焼結体
Claims (7)
- アルミナ成形体の焼成によってアルミナ焼結体を形成する工程Aと、
前記アルミナ焼結体上に、高融点金属、炭化モリブデン、炭化タングステンのうちのいずれか1種以上を主成分とし、アルミナが5〜30重量%含まれる電極ペーストを印刷する工程Bと、
前記アルミナ焼結体の電極ペースト印刷側にアルミナ粉体を充填し、金形成形により前記アルミナ粉体と前記電極ペーストと前記アルミナ焼結体とを一体化する工程Cと、
一体化した前記アルミナ粉体と前記電極ペーストと前記アルミナ焼結体とを焼成する工程Dと、
前記アルミナ焼結体を誘電体層とし、前記誘電体層の外表面を基板載置面とする工程Eによって形成されることを特徴とする電極内蔵焼結体の製造方法。 - 前記電極内蔵焼結体は、ヒータ、静電チャック又はサセプターのいずれかであることを特徴とする請求項1に記載の電極内蔵焼結体の製造方法。
- 前記高融点金属として、融点1650℃以上で、アルミナとの熱膨張差が5×10-6/K以内である金属を用いることを特徴とする請求項1又は2に記載の電極内蔵焼結体の製造方法。
- 前記高融点金属として、Mo、W、W/Mo合金、Hf、Ti,Ta,Rh,Re,Pt,Nbの中から選択されるいずれか1種以上の金属を用いることを特徴とする請求項3に記載の電極内蔵焼結体の製造方法。
- 前記アルミナ粉体には、バインダが含まれることを特徴とする請求項1〜4のいずれか1項に記載の電極内蔵焼結体の製造方法。
- 前記アルミナ焼結体及び前記アルミナ粉体に用いられるアルミナ原料粉は、純度が99.5%以上であることを特徴とする請求項1〜5のいずれか1項に記載の電極内蔵焼結体の製造方法。
- 前記焼成する工程は、焼成温度1400〜1650℃とし、ホットプレス法により焼成することを特徴とする請求項1〜6のいずれか1項に記載の電極内蔵焼結体の製造方法。
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TW094117231A TWI253139B (en) | 2004-06-02 | 2005-05-26 | Manufacturing method for sintered body with buried metallic member |
US11/141,699 US7547407B2 (en) | 2004-06-02 | 2005-05-31 | Manufacturing method for sintered body with buried metallic member |
EP05253411A EP1602635B1 (en) | 2004-06-02 | 2005-06-02 | Manufacturing method for sintered body with buried metallic member |
KR1020050047469A KR100645349B1 (ko) | 2004-06-02 | 2005-06-02 | 금속부재 내장 소결체의 제조 방법 |
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