JP4987238B2 - 窒化アルミニウム焼結体、半導体製造用部材及び窒化アルミニウム焼結体の製造方法 - Google Patents
窒化アルミニウム焼結体、半導体製造用部材及び窒化アルミニウム焼結体の製造方法 Download PDFInfo
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- JP4987238B2 JP4987238B2 JP2005090181A JP2005090181A JP4987238B2 JP 4987238 B2 JP4987238 B2 JP 4987238B2 JP 2005090181 A JP2005090181 A JP 2005090181A JP 2005090181 A JP2005090181 A JP 2005090181A JP 4987238 B2 JP4987238 B2 JP 4987238B2
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- aluminum nitride
- sintered body
- nitride sintered
- magnesium
- yttrium
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D15/00—Suspension arrangements for wings
- E05D15/26—Suspension arrangements for wings for folding wings
- E05D15/264—Suspension arrangements for wings for folding wings for bi-fold wings
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- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/581—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on aluminium nitride
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- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
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Description
窒化アルミニウム焼結体の平均粒径が、0.3μm以上であることが好ましい。これによれば、高温、高電圧環境において更に高体積抵抗の窒化アルミニウム焼結体を得ることができる。
本実施形態の窒化アルミニウム焼結体は、窒化アルミニウムを主成分とし、マグネシウムを0.4〜2.5wt%、イットリウムを2.0~5.0wt%含み、平均粒径が1.0μm以下である。窒化アルミニウム焼結体に含まれるマグネシウムが0.4wt%未満であると、体積抵抗率が低下してしまう。一方、窒化アルミニウム焼結体に含まれるマグネシウムが2.5wt%を越えると、高温、高電圧環境において高体積抵抗の窒化アルミニウム焼結体を得ることができない。また、窒化アルミニウム焼結体に含まれるマグネシウムが2.5wt%を越えると、大幅に熱伝導率が低下してしまい、窒化アルミニウムの高熱伝導率の特徴が薄れてしまう。また、窒化アルミニウム焼結体に含まれるイットリウムが2.0wt%未満であると、例えば1750℃以下といった低温での焼成において、焼結が不完全になり充分緻密な焼結体が得られない。一方、窒化アルミニウム焼結体に含まれるイットリウムが5.0wt%を越えると、体積抵抗率が低下してしまう。窒化アルミニウム焼結体の平均粒径が、1.0μmを越えると、体積抵抗率が低下してしまう。
このような窒化アルミニウム焼結体は、窒化アルミニウム原料粉末と、酸化マグネシウム換算で0.5〜3.0mol%のマグネシウムと、酸化イットリウム換算で0.5〜1.5mol%のイットリウムとを含む原料粉末を成形し、1750℃以下で焼成する工程によって製造できる。
本実施形態の窒化アルミニウム焼結体は、高温、高電圧環境において高体積抵抗が要求される様々な半導体製造用部材に適用できる。例えば、少なくとも一部を、窒化アルミニウムを主成分とし、0.4〜2.5wt%のマグネシウムと、2.0〜5.0wt%のイットリウムとを含有し、平均粒径が、1.0μm以下である本発明の窒化アルミニウム焼結体で形成し、金属部材が埋設された半導体製造用部材とすることができる。このような半導体製造用部材によれば、適切な高温、高電圧環境において高体積抵抗の特性を有する窒化アルミニウム焼結体を半導体製造用部材として提供することができる。
本発明は上記の実施形態によって記載したが、この開示の一部をなす論述はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなるはずである。
(実施例1〜12、比較例1〜4)
表1に示す組成比となるように、窒化アルミニウム粉末と酸化マグネシウム粉末と酸化イットリウム粉末等を秤量し、混合して原料粉末を作製した。なお、窒化アルミニウムの平均粒径は、0.2μmとした。具体的には、イソプロピルアルコールを溶媒とし、ナイロン製のポット及び玉石を用いて4時間湿式混合した。混合後のスラリーを取り出し、窒素雰囲気中にて110℃で乾燥した。更に、乾燥粉末を450℃で5時間、大気雰囲気中で熱処理し、湿式混合中に混入したカーボン成分を焼失除去し、原料粉末を作製した。なお、調合粉末の比率(mol%)は、窒化アルミニウム 、酸化マグネシウム、酸化イットリウム、酸化イッテルビウム、酸化チタン粉末等とも不純物含有量を無視して算出した割合を示す。
窒化アルミニウム焼結体を加工し得られた(1)〜(8)の評価の結果を表1に示す。
Claims (7)
- 窒化アルミニウムを主成分とし、0.4〜2.5wt%のマグネシウムと、2.0〜5.0wt%のイットリウムとを含有し、平均粒径が、1.0μm以下であり、格子定数のa軸長が、3.1125×10-10m以上であり、真空中、200℃において、印加電圧を2kV/mmとしたときの、電圧印加1分後の体積抵抗率が、1×10 15 Ω・cm以上であることを特徴とする窒化アルミニウム焼結体。
- 熱伝導率が、56W/mK以下であることを特徴とする請求項1に記載の窒化アルミニウム焼結体。
- 平均粒径が、0.3μm以上であることを特徴とする請求項1又は請求項2に記載の窒化アルミニウム焼結体。
- 熱伝導率が、30W/mK以上であることを特徴とする請求項1〜請求項3のいずれか1項に記載の窒化アルミニウム焼結体。
- 請求項1〜請求項4のいずれか1項に記載の窒化アルミニウム焼結体を製造する方法であって、
比表面積が9.7m2/g以上である窒化アルミニウム原料と、酸化マグネシウム換算で0.5〜3.0mol%のマグネシウムと、酸化イットリウム換算で0.5〜1.5mol%のイットリウムとを含む原料粉末を成形し、1750℃以下でホットプレス法により焼成する工程を含むことを特徴とする窒化アルミニウム焼結体の製造方法。 - 前記窒化アルミニウム原料の平均一次粒径は、0.5μm以下であることを特徴とする請求項5に記載の窒化アルミニウム焼結体の製造方法。
- 請求項1〜請求項4のいずれか1項に記載の窒化アルミニウム焼結体によって、少なくとも一部が構成されていることを特徴とする半導体製造用部材。
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US11/378,974 US7422992B2 (en) | 2005-03-25 | 2006-03-17 | Aluminum nitride sintered body, semiconductor manufacturing member, and method of manufacturing aluminum nitride sintered body |
KR1020060026091A KR100756619B1 (ko) | 2005-03-25 | 2006-03-22 | 질화알루미늄 소결체, 반도체 제조용 부재 및 질화알루미늄소결체의 제조 방법 |
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