JP2019527346A - 原子燃料棒に耐腐食性障壁被膜を施すためのスプレー法 - Google Patents
原子燃料棒に耐腐食性障壁被膜を施すためのスプレー法 Download PDFInfo
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Abstract
Description
本願は、参照によって本願に組み込まれる2016年7月22日出願の米国仮特許出願第62/365,632号に基づく優先権を主張する。
本発明は、エネルギー省との契約第DE−NE0008222号に基づく政府支援の下でなされたものである。米国政府は、本発明に対して一定の権利を有している。
Claims (32)
- 水冷式原子炉に使用される構成機器の基材上に耐腐食性障壁を形成する方法であって、
ジルコニウム合金基材を提供するステップと、
金属酸化物、金属窒化物、FeCrAl、FeCrAlYおよび高エントロピー合金から成る群より選択した平均直径が100ミクロン以下の粒子によって基材に所望の厚さの被膜を施すステップと
から成る方法。 - 前記被膜を施すステップは、金属酸化物、金属窒化物およびそれらの組み合わせから成る群より選択した粒子をプラズマアーク溶射法によって塗布することより成る、請求項1の方法。
- 前記金属酸化物粒子は、TiO2、Y2O3、Cr2O3およびそれらの組み合わせから成る群より選択される、請求項2の方法。
- 前記金属酸化物粒子は、TiO2、Y2O3およびそれらの組み合わせから成る群より選択される、請求項2の方法。
- 前記金属窒化物粒子は、TiN、CrN、ZrNおよびそれらの組み合わせから成る群より選択される、請求項2の方法。
- 前記被膜を施すステップは、FeCrAl、高エントロピー合金およびそれらの組み合わせから成る群より選択した粒子をコールドスプレー法によって塗布することより成る、請求項1の方法。
- 前記被膜を施すステップは、FeCrAl、FeCrAlY,高エントロピー合金およびそれらの組み合わせから成る群より選択した粒子をコールドスプレー法によって塗布することより成る、請求項1の方法。
- 前記高エントロピー合金は、Zr−Nb−Mo−Ti−V−Cr−Ta−WおよびCu−Cr−Fe−Ni−Al−Mnから成る系から選択した、原子濃度が0〜40%で、いずれの1元素も優勢的でない元素を4つ以上組み合わせたものから成る、請求項7の方法。
- 前記組み合わせはZr0.5NbTiVである、請求項8の方法。
- 前記組み合わせはAl0.5CuCrFeNi2である、請求項8の方法。
- 前記組み合わせはMo2NbTiVである、請求項8の方法。
- 前記コールドスプレー法は、
加圧されたキャリアガスを100〜1200℃の温度に加熱するステップと、
当該加熱されたキャリアガスに前記粒子を添加するステップと、
当該キャリアガスおよび同伴粒子を前記基材上に800〜4000フィート/秒(約243.84〜1219.20メートル/秒)の速度でスプレーして前記基材上に被膜を形成させるステップと
から成る請求項7の方法。 - 前記キャリアガスは、水素、窒素、アルゴン、二酸化炭素、ヘリウムおよびそれらの組み合わせから成る群より選択される、請求項12の方法。
- 前記粒子の付着速度が最大1000kg/時間である、請求項12の方法。
- 前記被膜の形成後に、前記被膜を焼鈍するステップをさらに含む、請求項12の方法。
- 前記被膜の形成後に、前記被膜の平滑性を高めるステップをさらに含む、請求項12の方法。
- 前記所望の厚さが5〜100ミクロンの範囲内である、請求項1の方法。
- 前記粒子の平均直径が20ミクロン以下である、請求項1の方法。
- 前記基材に粒子で被膜を施して前記耐腐食性障壁を形成するに先立って、前記基材の外面に高エントロピー合金、Mo、Nb、Ta、Wおよびそれらの組み合わせから成る群より選択した中間層をさらに形成することにより、前記基材と前記被膜との間に当該中間層を介在させることを特徴とする、請求項1の方法。
- 前記中間層は、直径100ミクロン以下のMo粒子を用いて前記基材に被膜を施すことによって形成する、請求項19の方法。
- 前記中間層は熱的付着法によって形成する、請求項19の方法。
- 前記熱的付着法はコールドスプレー法である、請求項21の方法。
- 前記コールドスプレー法は、
加圧されたキャリアガスを200〜1000℃の温度に加熱するステップと、
当該加熱されたキャリアガスに中間層材料の粒子を添加するステップと、
当該キャリアガスおよび同伴粒子を800〜4000フィート/秒(約243.84〜1219.20メートル/秒)の速度でスプレーするステップと
から成る請求項21の方法。 - 前記キャリアガスは、水素(H2)、窒素(N2)、アルゴン(Ar)、二酸化炭素(CO2)、ヘリウム(He)およびそれらの組み合わせから成る群より選択される、請求項23の方法。
- 前記中間層材料の粒子は、直径100ミクロン以下のMo粒子から成る、請求項24の方法。
- 水冷式原子炉に使用される被覆管であって、
当該被覆管はジルコニウム合金から成り、金属酸化物、金属窒化物、FeCrAl、FeCrAlY、高エントロピー合金およびそれらの組み合わせから成る群より選択した耐腐食性被膜を有することを特徴とする被覆管。 - 前記高エントロピー合金は、Zr−Nb−Mo−Ti−V−Cr−Ta−WおよびCu−Cr−Fe−Ni−Al−Mnから成る系から選択された、各元素の原子濃度が0〜40%で、いずれの1元素の原子濃度も優勢的でない、4つ以上の元素から成る群より選択されることを特徴とする、請求項26の被覆管。
- 前記ジルコニウム合金と前記耐腐食性被膜との間に中間層をさらに有する、請求項26の被覆管。
- 前記中間層材料は、Mo、Nb、Ta、Wおよびそれらの混合物から成る群より選択される、請求項28の被覆管。
- 前記中間層材料は高エントロピー合金である、請求項28の被覆管。
- 前記耐腐食性被膜は、TiN、CrN、ZrN、およびそれらの組み合わせから成る群より選択した金属窒化物である、請求項27の被覆管。
- 前記耐腐食性被膜は、TiO2,Y2O3,Cr2O3およびそれらの組み合わせから成る群より選択した金属酸化物である、請求項27の被覆管。
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JP2022024079A (ja) | 2022-02-08 |
KR20190026934A (ko) | 2019-03-13 |
EP3488026A1 (en) | 2019-05-29 |
WO2018017145A1 (en) | 2018-01-25 |
EP3488026A4 (en) | 2020-03-25 |
US20180025794A1 (en) | 2018-01-25 |
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