JP2006327933A - 半透明のpcaセラミック、セラミック放電容器及び製造法 - Google Patents
半透明のpcaセラミック、セラミック放電容器及び製造法 Download PDFInfo
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Abstract
【解決手段】焼結された半透明のセラミック物品において、MgOの量を含有し、かつアルミニウム、酸素及び窒素を含有する粒界相を有する多結晶アルミナから構成されていることを特徴とする、焼結された半透明のセラミック物品。
【選択図】なし
Description
半透明の多結晶アルミナ(PCA)セラミックは、今日の高圧ナトリウム(HPS)ランプ及びセラミックメタルハライドランプの製造を実現した。これらの適用におけるアーク放電容器は、ランプ稼働時に発生する高温高圧に耐えうると同時に、封入材料による化学的な攻撃に対して抵抗性でなければならない。
炭素要素炉中の窒素ガス雰囲気内で多結晶アルミナを焼結し、半透明にすることができることが見出された。ここで用いられているように、半透明とは、約400nm〜約700nmの可視波長領域における少なくとも92%の全透過率を意味する。有利に、本発明による放電容器の全透過率は少なくとも95%である。
7/2Al2O3+3/2C+1/2N2→Al7O9N+3/2CO
酸化アルミニウム焼結温度での炭素の部分圧は、約10-9atmと見積もることができる。有利に、炉雰囲気は炭素約1×10-12atm〜約1×10-7atmを含有すべきである。炉雰囲気はCO、CO2、H2、CH4及びC2H2の部分圧を含んでもよい。特に、焼結の間の前記ガスの部分圧は以下のように見積もられる:Pco10-3〜10-4atm;Pco210-6〜10-7atm;PH210-3atm;PCH410-10atm及びPC2H210-7atm。炭素要素炉中でPCAを焼結させるのが有利であるが、他の方法により、例えば黒鉛トレーを用いて、又は炭素の他の源を他の型の炉内に配置することにより、類似の焼結雰囲気を生じさせることができる。しかしながら、W及びMo構成部材を含有する炉中で雰囲気を制御することは比較的困難であり、なぜならば、前記金属は迅速にゲッターとして炭素を排除するためである。
図1は、先行技術の張り出した形の放電容器の断面図である。
本発明を、別の及び更なる課題、その利点及び性能と共により良く理解するために、図面に関連して採用される以下の開示及び付属の特許請求の範囲が参照される。
Claims (20)
- 焼結された半透明のセラミック物品において、MgOの量を含有し、かつアルミニウム、酸素及び窒素を含有する粒界相を有する多結晶アルミナから構成されていることを特徴とする、焼結された半透明のセラミック物品。
- 粒界相が酸窒化アルミニウムである、請求項1記載のセラミック物品。
- 多結晶アルミナ中のMgOの量が約100ppm〜約1000ppmである、請求項1記載のセラミック物品。
- セラミック放電容器において、MgOの量を含有し、かつアルミニウム、酸素及び窒素を含有する粒界相を有する半透明の多結晶アルミナから構成されたセラミック体を含有することを特徴とする、セラミック放電容器。
- 粒界相が酸窒化アルミニウムである、請求項4記載のセラミック放電容器。
- 多結晶アルミナ中のMgOの量が約100ppm〜約1000ppmである、請求項4記載のセラミック放電容器。
- 放電容器が少なくとも95%の全透過率を有する、請求項4記載のセラミック放電容器。
- セラミック体を焼結させて半透明にするための方法において、以下の工程:
(a)MgOでドープされた酸化アルミニウムから構成されているセラミック体を、炭素源と約0.005体積%以下の全不純物レベルを有する窒素ガス源により形成された窒素雰囲気とを含む炉内中に配置する工程;
(b)セラミック体を約1800℃〜約2000℃の温度で焼結させ、焼結された半透明のセラミック体を形成させる工程
を含むことを特徴とする方法。 - 焼結の間の炉雰囲気が炭素約1×10-12atm〜約1×10-7atmを含有する、請求項8記載の方法。
- 焼結の間の炉雰囲気が水素約0.2体積%未満を含有する、請求項8記載の方法。
- 焼結の間の炉雰囲気がCO約1×10-3atm〜約1×10-4atmを含有する、請求項9記載の方法。
- 焼結の間の炉雰囲気が水素約0.2体積%未満を含有する、請求項9記載の方法。
- セラミック体を約1時間〜約70時間にわたり焼結させる、請求項8記載の方法。
- セラミック体を約1850℃〜約1950℃の温度で約4時間〜約50時間にわたり焼結させる、請求項8記載の方法。
- セラミック体を約1900℃で約10時間にわたり焼結させる、請求項8記載の方法。
- 炉が炭素要素炉であり、炭素源が炉の1つ又は複数の構成部材である、請求項8記載の方法。
- 焼結の間の炉雰囲気が炭素約1×10-12atm〜約1×10-7atmを含有する、請求項16記載の方法。
- 焼結の間の炉雰囲気が水素約0.2体積%未満を含有する、請求項17記載の方法。
- セラミック体を約1850℃〜約1950℃の温度で約4時間〜約50時間にわたり焼結させる、請求項18記載の方法。
- セラミック体を焼結させて半透明にするための方法において、以下の工程:
(a)MgO約100ppm〜約1000ppmでドープされた酸化アルミニウムから構成されているセラミック体を、約0.005体積%以下の全不純物レベルを有する窒素ガス源により形成された窒素雰囲気を含有する炭素要素炉内に配置する工程;
(b)セラミック体を約1800℃〜約2000℃の温度で約1時間〜約70時間焼結させて焼結された半透明のセラミック体を形成させ、その際、焼結の間の炉雰囲気が炭素約1×10-12atm〜約1×10-7atm及び水素約0.2体積%未満を含有する工程
を含むことを特徴とする方法。
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US10/908,795 US7247591B2 (en) | 2005-05-26 | 2005-05-26 | Translucent PCA ceramic, ceramic discharge vessel, and method of making |
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US (2) | US7247591B2 (ja) |
EP (1) | EP1727178A3 (ja) |
JP (1) | JP2006327933A (ja) |
CN (1) | CN1880269B (ja) |
CA (1) | CA2537785A1 (ja) |
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KR20170088823A (ko) * | 2014-11-28 | 2017-08-02 | 엔지케이 인슐레이터 엘티디 | 알루미나 소결체 및 광학 소자용 하지 기판 |
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US20070072762A1 (en) * | 2005-09-29 | 2007-03-29 | Osram Sylvania Inc. | Method of Making Ceramic Discharge Vessels Using Stereolithography |
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US20050184636A1 (en) | 2005-08-25 |
US20070194503A1 (en) | 2007-08-23 |
CN1880269B (zh) | 2013-03-13 |
CA2537785A1 (en) | 2006-11-26 |
CN1880269A (zh) | 2006-12-20 |
US7247591B2 (en) | 2007-07-24 |
EP1727178A3 (en) | 2012-01-18 |
EP1727178A2 (en) | 2006-11-29 |
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