JP2005508822A - 焼結多結晶窒化ガリウム及びその製造方法 - Google Patents
焼結多結晶窒化ガリウム及びその製造方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G15/00—Compounds of gallium, indium or thallium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/065—Composition of the material produced
- B01J2203/0665—Gallium nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0675—Structural or physico-chemical features of the materials processed
- B01J2203/0685—Crystal sintering
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Abstract
【解決手段】ガリウムの原子分率が約49〜55%の範囲にあり、見掛け密度が約5.5〜6.1g/cm3であり、ビッカース硬度が約1GPaを超えることを特徴とする多結晶窒化ガリウム(GaN)。温度約1150〜1300℃、圧力約1〜10kbarで熱間等方圧加圧処理(HIP処理)することによって多結晶GaNを製造できる。別法として、温度約1200〜1800℃、圧力約5〜80kbarで高圧/高温(HP/HT)焼結処理することによって多結晶GaNを製造することもできる。
Description
市販のGaN粉末(0.3g)をピルの形状にプレスし、片口Vycor(登録商標)ガラス管に入れた。管を排気し、開口端をトーチ溶接で封止した。封止管を市販の熱間等方圧プレス内に入れ、速度5℃/分で1150℃に加熱し、その時点で圧力を30000psi(2kbar)まで高めた。十分な圧力に達した後、温度を1200℃に上げ30分保持した。次に、温度を10℃/分の速度で下げ、圧力を大気圧に下げた。HIP処理前後のVycor(登録商標)管に封入したGaNピルを図1に示す。
市販のGaN粉末(0.85g)を直径0.440インチ(11.2mm)、厚さ0.165インチ(4.2mm)、密度2.07g/cm3の円柱状ピルの形状にプレスした。ピルを六方晶系窒化ホウ素(hBN)製容器に入れ、この全体をベルト型装置内の高圧/高温(HP/HT)セルに入れた。hBNは圧力伝達媒体として作用し、GaNピルの汚染を防ぐ。
Suscavage他の方法で多結晶GaNを形成した。1.0gの金属Gaをアルミナボートに入れ、アルミナ板で部分的に覆った。両方のアルミナ部材を石英管に装入し、雰囲気制御された管炉に入れた。2.0gのNH4Clも管炉の一端近くに入れた。チャンバーを棟内真空装置を用いて排気し、次いでアルゴンを補充した。この工程をもう一度繰り返した。次に、チャンバーにアルゴンを流量1SCFHで、NH3を流量0.5SCFHで流した。10分後、炉の温度を800℃に上げた。その温度に達したところで、NH4Clの入ったアルミナるつぼを第二ヒーターを用いて250℃程度に加熱した。系をこの条件に4時間保持し、次いでヒーターを止めた。実験の終わりに、多結晶GaNのフィルムをアルミナるつぼとふたから取り出した。フィルムのミクロ組織を図5に示す。フィルムは、焼結で形成した多結晶GaNとは異なり、柱状ミクロ組織と粗い表面を有し、100μmを超える結晶粒が多数存在する。
Claims (27)
- ガリウムの原子分率が約49〜55%の範囲にあり、見掛け密度が約5.5〜6.1g/cm3であり、ビッカース硬度が約1GPaを超える、多結晶窒化ガリウム(GaN)。
- 約0.2mm〜1mの厚さ又は最小寸法を有する、請求項1記載のGaN。
- 約1mm〜1mの直径又は最大寸法を有する、請求項1記載のGaN。
- 平均粒度約0.01〜50μmの等軸結晶粒を含む、請求項1記載のGaN。
- 二乗平均平方根粗さ約100μm未満の実質的に平滑な表面を有する、請求項1記載のGaN。
- 二乗平均平方根粗さ約20μm未満の実質的に平滑な表面を有する、請求項5記載のGaN。
- (a)非金属容器に窒化ガリウム(GaN)を粉末又は冷間圧縮ピルのいずれか又は両方として装入、封止し、
(b)容器を温度約1150〜1300℃の範囲、圧力約1〜10kbarの範囲で熱間等圧加圧処理(HIP処理)し、次いで
(c)容器から多結晶GaNを回収する
工程を含む、焼結多結晶GaNの製造方法。 - 封止する前に非金属容器内の空気を排気する、請求項7記載の方法。
- HIP処理が約2分〜24時間実施される、請求項7記載の方法。
- 回収工程が焼結多結晶GaNから容器を研削除去する工程を含む、請求項7記載の方法。
- 焼結多結晶GaNが約0.2mm〜1mの厚さ又は最小寸法を有する、請求項7記載の方法。
- 焼結多結晶GaNが約1mm〜1mの直径又は最大寸法を有する、請求項7記載の方法。
- 焼結多結晶GaNが平均粒度約0.01〜50μmの等軸結晶粒を含む、請求項7記載の方法。
- 焼結多結晶GaNが二乗平均平方根粗さ約100μm未満の実質的に平滑な表面を有する、請求項7記載の方法。
- 焼結多結晶GaNが二乗平均平方根粗さ約20μm未満の実質的に平滑な表面を有する、請求項14記載の方法。
- 容器に装入されるGaNが粉末である、請求項7記載の方法。
- 容器に装入されるGaNが冷間圧縮ピルである、請求項7記載の方法。
- (a)高圧/高温(HP/HT)反応セルに窒化ガリウム(GaN)を粉末又は冷間圧縮ピルのいずれか又は両方として入れ、
(b)反応セルをHP/HT装置に入れ、
(c)容器に約1200〜1800℃の範囲の温度及び約5〜80kbarの範囲の圧力を加え、次いで
(d)反応セルから多結晶GaNを回収する
工程を含む、焼結多結晶GaNの製造方法。 - 工程(c)が約2分〜24時間実施される、請求項18記載の方法。
- 回収工程が研削処理を含む、請求項18記載の方法。
- 焼結多結晶GaNが約0.2mm〜1mの厚さ又は最小寸法を有する、請求項18記載の方法。
- 焼結多結晶GaNが約1mm〜1mの直径又は最大寸法を有する、請求項18記載の方法。
- 焼結多結晶GaNが平均粒度約0.01〜50μmの等軸結晶粒を含む、請求項18記載の方法。
- 焼結多結晶GaNが二乗平均平方根粗さ約100μm未満の実質的に平滑な表面を有する、請求項18記載の方法。
- 焼結多結晶GaNが二乗平均平方根粗さ約20μm未満の実質的に平滑な表面を有する、請求項24記載の方法。
- 容器に装入するGaNが粉末である、請求項18記載の方法。
- 容器に装入するGaNが冷間圧縮ピルである、請求項18記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/001,575 US6861130B2 (en) | 2001-11-02 | 2001-11-02 | Sintered polycrystalline gallium nitride and its production |
PCT/US2002/034792 WO2003041138A2 (en) | 2001-11-02 | 2002-10-30 | Sintered polycrystalline gallium nitride |
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JP2005508822A true JP2005508822A (ja) | 2005-04-07 |
JP2005508822A5 JP2005508822A5 (ja) | 2006-01-05 |
JP4349907B2 JP4349907B2 (ja) | 2009-10-21 |
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US (1) | US6861130B2 (ja) |
EP (1) | EP1444165A2 (ja) |
JP (1) | JP4349907B2 (ja) |
KR (1) | KR100903251B1 (ja) |
CN (1) | CN1280182C (ja) |
AU (1) | AU2002363469A1 (ja) |
PL (1) | PL368506A1 (ja) |
WO (1) | WO2003041138A2 (ja) |
ZA (1) | ZA200403783B (ja) |
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WO2012086661A1 (ja) | 2010-12-20 | 2012-06-28 | 東ソー株式会社 | 窒化ガリウム焼結体または窒化ガリウム成形物及びそれらの製造方法 |
WO2013062042A1 (ja) | 2011-10-28 | 2013-05-02 | 三菱化学株式会社 | 窒化物結晶の製造方法および窒化物結晶 |
KR20190022927A (ko) | 2011-10-28 | 2019-03-06 | 미쯔비시 케미컬 주식회사 | 질화물 결정의 제조 방법 및 질화물 결정 |
WO2020075661A1 (ja) | 2018-10-10 | 2020-04-16 | 東ソー株式会社 | 窒化ガリウム系焼結体及びその製造方法 |
JP2020075851A (ja) * | 2018-10-26 | 2020-05-21 | 東ソー株式会社 | 窒化ガリウム系焼結体及びその製造方法 |
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US4146379A (en) * | 1977-08-24 | 1979-03-27 | University Of Southern California | Process for densifying polycrystalline articles |
US6096282A (en) * | 1996-09-10 | 2000-08-01 | The Regents Of The University Of California | Instantaneous synthesis of refractory nitrides from solid precursors |
WO1998011017A1 (en) * | 1996-09-10 | 1998-03-19 | The Regents Of The University Of California | Process for rapid solid-state formation of refractory nitrides |
US6270569B1 (en) * | 1997-06-11 | 2001-08-07 | Hitachi Cable Ltd. | Method of fabricating nitride crystal, mixture, liquid phase growth method, nitride crystal, nitride crystal powders, and vapor phase growth method |
US6177057B1 (en) * | 1999-02-09 | 2001-01-23 | The United States Of America As Represented By The Secretary Of The Navy | Process for preparing bulk cubic gallium nitride |
US6113985A (en) * | 1999-04-27 | 2000-09-05 | The United States Of America As Represented By Secretary Of The Air Force | Process for the manufacture of group III nitride targets for use in sputtering and similar equipment |
-
2001
- 2001-11-02 US US10/001,575 patent/US6861130B2/en not_active Expired - Lifetime
-
2002
- 2002-10-30 CN CNB028218302A patent/CN1280182C/zh not_active Expired - Fee Related
- 2002-10-30 JP JP2003543080A patent/JP4349907B2/ja not_active Expired - Fee Related
- 2002-10-30 KR KR1020047006467A patent/KR100903251B1/ko active IP Right Grant
- 2002-10-30 WO PCT/US2002/034792 patent/WO2003041138A2/en active Application Filing
- 2002-10-30 AU AU2002363469A patent/AU2002363469A1/en not_active Abandoned
- 2002-10-30 PL PL02368506A patent/PL368506A1/xx not_active Application Discontinuation
- 2002-10-30 EP EP02799172A patent/EP1444165A2/en not_active Ceased
-
2004
- 2004-05-17 ZA ZA200403783A patent/ZA200403783B/xx unknown
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JP2012144424A (ja) * | 2010-12-20 | 2012-08-02 | Tosoh Corp | 窒化ガリウム焼結体または窒化ガリウム成形体ならびにそれらの製造方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN1280182C (zh) | 2006-10-18 |
US6861130B2 (en) | 2005-03-01 |
CN1582256A (zh) | 2005-02-16 |
WO2003041138A3 (en) | 2004-02-19 |
ZA200403783B (en) | 2005-11-21 |
WO2003041138A2 (en) | 2003-05-15 |
EP1444165A2 (en) | 2004-08-11 |
PL368506A1 (en) | 2005-04-04 |
KR20040053234A (ko) | 2004-06-23 |
KR100903251B1 (ko) | 2009-06-17 |
AU2002363469A1 (en) | 2003-05-19 |
JP4349907B2 (ja) | 2009-10-21 |
US20030086856A1 (en) | 2003-05-08 |
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